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This commit introduces a primary vector pipeline model for the SiFive 7
series, that pipeline model is kind of simplified version, it only
defined vector command queue, arithmetic unit, and vector load store
unit.
The latency of real hardware is LMUL-aware, but I realize that will
complicate the model a lots, so I just use a simplified version, which
all LMUL use same latency, we may improve it later once we have found
meaningful performance difference.
gcc/ChangeLog:
* config/riscv/sifive-7.md: Add primary vector pipeline model
for SiFive 7 series.
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pipeline model [PR120659]
gcc/ChangeLog:
PR target/120659
* config/riscv/sifive-7.md: Add B extension, fp16 and missing
scalar instruction type for sifive-7 pipeline model.
gcc/testsuite/ChangeLog:
PR target/120659
* gcc.target/riscv/pr120659.c: New test.
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The following adds SLP build operand swapping for .FMA which is
a ternary operator and a call. The current code only handles
binary operators in assignments, thus the patch extends this to
handle both calls and assignments as well as binary and ternary
operators.
* tree-vect-slp.cc (vect_build_slp_2): Handle ternary
and call operators when swapping operands.
* gcc.target/i386/vect-pr82426.c: Pass explicit -ffp-contract=fast.
* gcc.target/i386/vect-pr82426-2.c: New testcase variant with
-ffp-contract=on.
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This pattern enables the combine pass (or late-combine, depending on the case)
to merge a vec_duplicate into a (possibly negated) minus-mult RTL instruction.
Before this patch, we have two instructions, e.g.:
vfmv.v.f v6,fa0
vfnmacc.vv v2,v6,v4
After, we get only one:
vfnmacc.vf v2,fa0,v4
PR target/119100
gcc/ChangeLog:
* config/riscv/autovec-opt.md (*vfnmsub_<mode>,*vfnmadd_<mode>): Handle
both add and acc variants.
* config/riscv/vector.md (*pred_mul_neg_<optab><mode>_scalar_undef): New
pattern.
gcc/testsuite/ChangeLog:
* gcc.target/riscv/rvv/autovec/vx_vf/vf-1-f16.c: Add vfnmacc and
vfnmsac.
* gcc.target/riscv/rvv/autovec/vx_vf/vf-1-f32.c: Likewise.
* gcc.target/riscv/rvv/autovec/vx_vf/vf-1-f64.c: Likewise.
* gcc.target/riscv/rvv/autovec/vx_vf/vf-2-f16.c: Likewise.
* gcc.target/riscv/rvv/autovec/vx_vf/vf-2-f32.c: Likewise.
* gcc.target/riscv/rvv/autovec/vx_vf/vf-2-f64.c: Likewise.
* gcc.target/riscv/rvv/autovec/vx_vf/vf-3-f16.c: Likewise.
* gcc.target/riscv/rvv/autovec/vx_vf/vf-3-f32.c: Likewise.
* gcc.target/riscv/rvv/autovec/vx_vf/vf-3-f64.c: Likewise.
* gcc.target/riscv/rvv/autovec/vx_vf/vf-4-f16.c: Likewise.
* gcc.target/riscv/rvv/autovec/vx_vf/vf-4-f32.c: Likewise.
* gcc.target/riscv/rvv/autovec/vx_vf/vf-4-f64.c: Likewise.
* gcc.target/riscv/rvv/autovec/vx_vf/vf_mulop.h (DEF_VF_MULOP_CASE_1):
Fix return type.
* gcc.target/riscv/rvv/autovec/vx_vf/vf_vfnmacc-run-1-f16.c: New test.
* gcc.target/riscv/rvv/autovec/vx_vf/vf_vfnmacc-run-1-f32.c: New test.
* gcc.target/riscv/rvv/autovec/vx_vf/vf_vfnmacc-run-1-f64.c: New test.
* gcc.target/riscv/rvv/autovec/vx_vf/vf_vfnmsac-run-1-f16.c: New test.
* gcc.target/riscv/rvv/autovec/vx_vf/vf_vfnmsac-run-1-f32.c: New test.
* gcc.target/riscv/rvv/autovec/vx_vf/vf_vfnmsac-run-1-f64.c: New test.
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This adds support for -mcpu=gb10. This is a big.LITTLE configuration
involving Cortex-X925 and Cortex-A725 cores. The appropriate MIDR numbers
are added to detect them in -mcpu=native. We did not add an
-mcpu=cortex-x925.cortex-a725 option because GB10 does include the crypto
instructions which we want on by default, and the current convention is to not
enable such extensions for Arm Cortex cores in -mcpu where they are optional
in the IP.
Bootstrapped and tested on aarch64-none-linux-gnu.
Signed-off-by: Kyrylo Tkachov <ktkachov@nvidia.com>
gcc/
* config/aarch64/aarch64-cores.def (gb10): New entry.
* config/aarch64/aarch64-tune.md: Regenerate.
* doc/invoke.texi (AArch64 Options): Document the above.
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C2Y voted in the
https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3466.pdf
paper, which clarifies some of the conditional nonnull cases.
For strncat/__strncat_chk no changes are necessary, we already
use __attribute__((nonnull (1), nonnull_if_nonzero (2, 3))) attributes
on the builtin and glibc can do the same too, meaning that first
argument must be nonnull always and second must be nonnull if
the third one is nonzero.
The problem is with the fread/fwrite changes, where the paper adds:
If size or nmemb is zero,
+ptr may be a null pointer,
fread returns zero and the contents of the array and the state of
the stream remain unchanged.
and ditto for fwrite, so the two argument nonnull_if_nonzero attribute
isn't usable to express that, because whether the pointer can be null
depends on 2 integral arguments rather than one.
The following patch extends the nonnull_if_nonzero attribute, so that
instead of requiring 2 arguments it allows 2 or 3, the first one
is still the pointer argument index which sometimes must not be null
and the other one or two are integral arguments, if there are 2, the
invalid case is only if pointer is null and both the integral arguments
are nonzero.
2025-06-30 Jakub Jelinek <jakub@redhat.com>
PR c/120520
PR c/117023
gcc/
* builtin-attrs.def (DEF_LIST_INT_INT_INT): Define it and
use for 1,2,3.
(ATTR_NONNULL_IF123_LIST): New DEF_ATTR_TREE_LIST.
(ATTR_NONNULL_4_IF123_LIST): Likewise.
* builtins.def (BUILT_IN_FWRITE): Use ATTR_NONNULL_4_IF123_LIST
instead of ATTR_NONNULL_LIST.
(BUILT_IN_FWRITE_UNLOCKED): Likewise.
* gimple.h (infer_nonnull_range_by_attribute): Add another optional
tree * argument defaulted to NULL.
* gimple.cc (infer_nonnull_range_by_attribute): Add OP3 argument,
handle 3 argument nonnull_if_nonzero attribute.
* builtins.cc (validate_arglist): Handle 3 argument nonnull_if_nonzero
attribute.
* tree-ssa-ccp.cc (pass_post_ipa_warn::execute): Likewise.
* ubsan.cc (instrument_nonnull_arg): Adjust
infer_nonnull_range_by_attribute caller, handle 3 argument
nonnull_if_nonzero attribute.
* gimple-range-infer.cc (gimple_infer_range::gimple_infer_range):
Handle 3 argument nonnull_if_nonzero attribute.
* doc/extend.texi (nonnull_if_nonzero): Document 3 argument version
of the attribute.
gcc/c-family/
* c-attribs.cc (c_common_gnu_attributes): Allow 2 or 3 arguments for
nonnull_if_nonzero attribute instead of only 2.
(handle_nonnull_if_nonzero_attribute): Handle 3 argument
nonnull_if_nonzero.
* c-common.cc (struct nonnull_arg_ctx): Rename other member to other1,
add other2 member.
(check_function_nonnull): Clear a if nonnull attribute has an
argument. Adjust for nonnull_arg_ctx changes. Handle 3 argument
nonnull_if_nonzero attribute.
(check_nonnull_arg): Adjust for nonnull_arg_ctx changes, emit different
diagnostics for 3 argument nonnull_if_nonzero attributes.
(check_function_arguments): Adjust ctx var initialization.
gcc/analyzer/
* sm-malloc.cc (malloc_state_machine::on_stmt): Handle 3 argument
nonnull_if_nonzero attribute.
gcc/testsuite/
* gcc.dg/nonnull-9.c: Tweak for 3 argument nonnull_if_nonzero
attribute support, add further tests.
* gcc.dg/nonnull-12.c: New test.
* gcc.dg/nonnull-13.c: New test.
* gcc.dg/nonnull-14.c: New test.
* c-c++-common/ubsan/nonnull-8.c: New test.
* c-c++-common/ubsan/nonnull-9.c: New test.
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lra-eliminations.cc:move_plus_up tries to:
Transform (subreg (plus reg const)) to (plus (subreg reg) const)
when it is possible.
Most of it is heavily conditional:
if (!paradoxical_subreg_p (x)
&& GET_CODE (subreg_reg) == PLUS
&& CONSTANT_P (XEXP (subreg_reg, 1))
&& GET_MODE_CLASS (x_mode) == MODE_INT
&& GET_MODE_CLASS (subreg_reg_mode) == MODE_INT)
{
rtx cst = simplify_subreg (x_mode, XEXP (subreg_reg, 1), subreg_reg_mode,
subreg_lowpart_offset (x_mode,
subreg_reg_mode));
if (cst && CONSTANT_P (cst))
but the final:
return gen_rtx_PLUS (x_mode, lowpart_subreg (x_mode,
XEXP (subreg_reg, 0),
subreg_reg_mode), cst);
assumed without checking that lowpart_subreg succeeded. In the PR,
this led to creating a PLUS with a null operand.
In more detail, the testcase had:
(var_location a (plus:SI (subreg:SI (reg/f:DI 64 sfp) 0)
(const_int -4 [0xfffffffffffffffc])))
with sfp being eliminated to (plus:DI (reg:DI sp) (const_int 16)).
Initially, during the !subst_p phase, lra_eliminate_regs_1 sees
the PLUS and recurses into each operand. The recursive call sees
the SUBREG and recurses into the SUBREG_REG. Since !subst_p,
this final recursive call replaces (reg:DI sfp) with:
(plus:DI (reg:DI sfp) (const_int 16))
(i.e. keeping the base register the same). So the SUBREG is
eliminated to:
(subreg:SI (plus:DI (reg:DI sfp) (const_int 16)) 0)
The PLUS handling in lra_eliminate_regs_1 then passes this to
move_plus_up, which tries to push the SUBREG into the PLUS.
This means trying to create:
(plus:SI (simplify_gen_subreg:SI (reg:DI sfp) 0) (const_int 16))
The simplify_gen_subreg then returns null, because simplify_subreg_regno
fails both with allow_stack_regs==false (when trying to simplify the
SUBREG to a REG) and with allow_stack_regs=true (when validating
whether the SUBREG can be generated). And that in turn happens
because aarch64 refuses to allow SImode to be stored in sfp:
if (regno == SP_REGNUM)
/* The purpose of comparing with ptr_mode is to support the
global register variable associated with the stack pointer
register via the syntax of asm ("wsp") in ILP32. */
return mode == Pmode || mode == ptr_mode;
if (regno == FRAME_POINTER_REGNUM || regno == ARG_POINTER_REGNUM)
return mode == Pmode;
This seems dubious. If the frame pointer can hold a DImode value then it
can also hold an SImode value. There might be limited cases when the low
32 bits of the frame pointer are useful, but aarch64_hard_regno_mode_ok
doesn't have the context to second-guess things like that. It seemed
from a quick scan of other targets that they behave more as I'd expect.
So there might be a target bug here too. But it seemed worth fixing the
unchecked use of lowpart_subreg independently of that.
The patch fixes an existing ICE in gcc.c-torture/compile/pass.c.
gcc/
PR rtl-optimization/120733
* lra-eliminations.cc (move_plus_up): Check whether lowpart_subreg
returns null.
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This patch re-adds logic to increase counts of annotated basic blocks if otherwise
the Kirhoff law can not be solved. This is done only in easy cases where total
count of in or out edges is smaller than the count of BB or when BB has single
exit which is annotated by small count.
This helps to solve problems seen i.e. in parest where header of loops gets too
low count because vectorizer replaced the IV condiitonal and did not preserved
debug info. We should solve the debug info issues as well, and simiar problems
can now be tracked by in afdo debug dumps.
gcc/ChangeLog:
* auto-profile.cc (autofdo_source_profile::offline_external_functions):
Add missing newline in dump.
(afdo_propagate_edge): If annotated BB or edge has too small count
bump it up to mitigate profile imprecisions caused by vectorizer.
(afdo_propagate): Increase number of iteraitons and fix dump
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We are missing discriminator info in auto-profiles, for example in exchange2.
I am not sure why, since I see the info still present in dwarf2out, so it may
be bug at create_gcov side.
This patch makes the workaround to ouptput better diagnostics (to actually show
the soruce location). This needs promotion of location info through the inline
stack API, so I turned it from pair to actual structure. Overall I think pairs
are overused in this source and makes it harder to read.
Bootstrapped/regtested x86_64-linux, comitted.
gcc/ChangeLog:
* auto-profile.cc (struct decl_lineno): Turn to structure; add
location.
(dump_inline_stack): Update.
(get_inline_stack): Update.
(get_relative_location_for_locus): Fixup formating.
(function_instance::get_function_instance_by_decl): Add
LOCATION parameter; improve dumping.
(autofdo_source_profile::get_callsite_total_count): Improve dumping;
update.
(walk_block): Update.
(autofdo_source_profile::offline_unrealized_inlines): Update.
(autofdo_source_profile::get_count_info): Update.
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Update functions with no_callee_saved_registers/preserve_none attribute
to preserve frame pointer since caller may use it to save the current
stack:
pushq %rbp
movq %rsp, %rbp
...
call function
...
leave
ret
If callee changes frame pointer without restoring it, caller will fail
to restore its stack after callee returns as LEAVE does
mov %rbp, %rsp
pop %rbp
The corrupted frame pointer will corrupt stack pointer in caller.
There are no regressions on Linux/x86-64. Also tested with
https://github.com/python/cpython
configured with "./configure --with-tail-call-interp".
gcc/
PR target/120840
* config/i386/i386-expand.cc (ix86_expand_call): Don't mark
hard frame pointer as clobber.
* config/i386/i386-options.cc (ix86_set_func_type): Use
TYPE_NO_CALLEE_SAVED_REGISTERS instead of
TYPE_NO_CALLEE_SAVED_REGISTERS_EXCEPT_BP.
* config/i386/i386.cc (ix86_function_ok_for_sibcall): Remove the
TYPE_NO_CALLEE_SAVED_REGISTERS_EXCEPT_BP check.
(ix86_save_reg): Merge TYPE_NO_CALLEE_SAVED_REGISTERS and
TYPE_PRESERVE_NONE with TYPE_NO_CALLEE_SAVED_REGISTERS_EXCEPT_BP.
* config/i386/i386.h (call_saved_registers_type): Remove
TYPE_NO_CALLEE_SAVED_REGISTERS_EXCEPT_BP.
* doc/extend.texi: Update no_callee_saved_registers documentation.
gcc/testsuite/
PR target/120840
* gcc.target/i386/no-callee-saved-1.c: Updated.
* gcc.target/i386/no-callee-saved-2.c: Likewise.
* gcc.target/i386/no-callee-saved-7.c: Likewise.
* gcc.target/i386/no-callee-saved-8.c: Likewise.
* gcc.target/i386/no-callee-saved-9.c: Likewise.
* gcc.target/i386/no-callee-saved-10.c: Likewise.
* gcc.target/i386/no-callee-saved-18.c: Likewise.
* gcc.target/i386/no-callee-saved-19a.c: Likewise.
* gcc.target/i386/no-callee-saved-19c.c: Likewise.
* gcc.target/i386/no-callee-saved-19d.c: Likewise.
* gcc.target/i386/pr119784a.c: Likewise.
* gcc.target/i386/preserve-none-6.c: Likewise.
* gcc.target/i386/preserve-none-7.c: Likewise.
* gcc.target/i386/preserve-none-12.c: Likewise.
* gcc.target/i386/preserve-none-13.c: Likewise.
* gcc.target/i386/preserve-none-14.c: Likewise.
* gcc.target/i386/preserve-none-15.c: Likewise.
* gcc.target/i386/preserve-none-23.c: Likewise.
* gcc.target/i386/pr120840-1a.c: New test.
* gcc.target/i386/pr120840-1b.c: Likewise.
* gcc.target/i386/pr120840-1c.c: Likewise.
* gcc.target/i386/pr120840-1d.c: Likewise.
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
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The current implementation of this function is somewhat difficult to
understand, as it uses a direct break statement within the for loop,
rendering the loop meaningless. Additionally, during the Coverity check
on the for loop, a warning appeared: "unreachable: Since the loop
increment ix++; is unreachable, the loop body will never execute more
than once." Therefore, I have made some simple refactoring to address
these issues.
gcc/ChangeLog:
* config/riscv/riscv-vsetvl.cc (bitmap_union_of_preds_with_entry):
Refactor.
Signed-off-by: Jin Ma <jinma@linux.alibaba.com>
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Pipeline checker utility for RISC-V architecture that validates processor
pipeline models. This tool analyzes machine description files to ensure all
instruction types are properly handled by pipeline scheduling models.
I write this tool since I am implment vector pipeline stuff for SiFive
core, but it's hard to find which instruction type is not handled by
pipeline scheduling models. This tool will help me to find out which
instruction type is not handled by pipeline scheduling models, so I can
fix them.
And I think it may be useful for other RISC-V core developers, so I
decided to upstream that :)
Usage:
```
./pipeline-checker <your-pipeline-model>
```
Example:
```
$ ./pipeline-checker sifive-7.md
Error: Some types are not consumed by the pipemodel
Missing types:
{'vfclass', 'vimovxv', 'vmov', 'rdfrm', 'wrfrm', 'ghost', 'wrvxrm', 'crypto', 'vwsll', 'vfmovfv', 'vimovvx', 'sf_vc', 'vfmovvf', 'sf_vc_se', 'rdvlenb', 'vbrev', 'vrev8', 'sf_vqmacc', 'sf_vfnrclip', 'vsetvl_pre', 'rdvl', 'vsetvl'}
```
gcc/ChangeLog:
* config/riscv/pipeline-checker: New file.
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This patch provides GetFileName procedure function for
FIO.File, FileSystem.File and IOChan.ChanId. The
return result from these procedures can be passed into
StringFileSysOp.Unlink to complete the required delete.
gcc/m2/ChangeLog:
PR modula2/117203
* gm2-libs-log/FileSystem.def (GetFileName): New
procedure function.
(WriteString): New procedure.
* gm2-libs-log/FileSystem.mod (GetFileName): New
procedure function.
(WriteString): New procedure.
* gm2-libs/SFIO.def (GetFileName): New procedure function.
* gm2-libs/SFIO.mod (GetFileName): New procedure function.
* gm2-libs-iso/IOChanUtils.def: New file.
* gm2-libs-iso/IOChanUtils.mod: New file.
libgm2/ChangeLog:
PR modula2/117203
* libm2iso/Makefile.am (M2DEFS): Add IOChanUtils.def.
(M2MODS): Add IOChanUtils.mod.
* libm2iso/Makefile.in: Regenerate.
gcc/testsuite/ChangeLog:
PR modula2/117203
* gm2/isolib/run/pass/testdelete2.mod: New test.
* gm2/pimlib/logitech/run/pass/testdelete2.mod: New test.
* gm2/pimlib/run/pass/testdelete.mod: New test.
Signed-off-by: Gaius Mulley <gaiusmod2@gmail.com>
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Scan "lea(l|q)", instead of "leaq", to support x32.
* gcc.target/i386/shrink_wrap_separate_check_lea.c: Scan
"lea(l|q)", instead of "leaq".
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
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Because COBOL doesn't require function prototypes, it is possible to, for
example,
CALL "getcwd" USING <parameters>
and then later
CALL "getcwd" USING <parameters> RETURNING <alphanumeric>
The second call "knows" that the return value is a char*, but the first one
does not. So, the first one gets a default return value type of SSIZE_t, which
later needs to be replaced with CHAR_P.
These [all too] extensive changes ensure that all references to a particular
function use the same function_decl, and take measures to make sure that one
function_decl is back-modified, if necessary, with the best return value type.
gcc/cobol/ChangeLog:
* Make-lang.in: Incorporate gcobol.clean.
* except.cc (cbl_enabled_exceptions_t::dump): Update debug message.
* genapi.cc (gg_attribute_bit_get): Formatting.
(file_static_variable): Formatting.
(trace1_init): Formatting.
(build_main_that_calls_something): Normalize function_decl use.
(parser_call_target): Likewise.
(set_call_convention): Likewise.
(parser_call_target_convention): Likewise.
(parser_call_targets_dump): Likewise.
(function_handle_from_name): Likewise.
(function_pointer_from_name): Likewise.
(parser_initialize_programs): Likewise.
(parser_statement_begin): Formatting.
(parser_leave_file): Use function_decl FIFO.
(enter_program_common): Normalize function_decl use.
(parser_enter_program): Normalize function_decl use.
(tree_type_from_field_type): Normalize function_decl use.
(is_valuable): Comment.
(pe_stuff): Change name to program_end_stuff.
(program_end_stuff): Likewise.
(parser_exit): Likewise.
(parser_division): Normalize function_decl use.
(create_and_call): Normalize function_decl use.
(parser_call): Normalize function_decl use.
(parser_set_pointers): Normalize function_decl use.
(parser_program_hierarchy): Normalize function_decl use.
(psa_FldLiteralA): Defeat attempt to re-use literals. (Fails on some aarch64).
(parser_symbol_add): Error message formatting.
* genapi.h: Formatting.
* gengen.cc (struct cbl_translation_unit_t): Add function_decl FIFO.
(show_type): Rename to gg_show_type.
(gg_show_type): Correct an error message.
(gg_assign): Formatting; change error handling.
(gg_modify_function_type): Normalize function_decl use.
(gg_define_function_with_no_parameters): Fold into gg_defint_function().
(function_decl_key): Normalize function_decl use.
(gg_peek_fn_decl): Normalize function_decl use.
(gg_build_fn_decl): Normalize function_decl use.
(gg_define_function): Normalize function_decl use.
(gg_tack_on_function_parameters): Remove.
(gg_finalize_function): Normalize function_decl use.
(gg_leaving_the_source_code_file): Normalize function_decl use.
(gg_call_expr_list): Normalize function_decl use.
(gg_trans_unit_var_decl): Normalize function_decl use.
(gg_insert_into_assemblerf): New function; formatting.
* gengen.h (struct gg_function_t): Eliminate "is_truly_nested" flag.
(gg_assign): Incorporate return value.
(gg_define_function): Normalize function_decl use.
(gg_define_function_with_no_parameters): Eliminate.
(gg_build_fn_decl): Normalize function_decl use.
(gg_peek_fn_decl): Normalize function_decl use.
(gg_modify_function_type): Normalize function_decl use.
(gg_call_expr_list): Normalize function_decl use.
(gg_get_function_decl): Normalize function_decl use.
(location_from_lineno): Prefix with "extern".
(gg_open): Likewise.
(gg_close): Likewise.
(gg_get_indirect_reference): Likewise.
(gg_insert_into_assembler): Likewise.
(gg_insert_into_assemblerf): Likewise.
(gg_show_type): New declaration.
(gg_leaving_the_source_code_file): New declaration.
* parse.y: Format debugging message.
* parse_ante.h: Normalize function_decl use.
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Add "void debug (tree)" to support:
(gdb) call debug (expr)
<parm_decl 0x7fffe9810bb0 f
type <record_type 0x7fffe99cec78 c BLK
size <integer_cst 0x7fffe98242d0 constant 256>
unit-size <integer_cst 0x7fffe98243a8 constant 32>
user align:256 warn_if_not_align:0 symtab:0 alias-set -1 canonical-type 0x7fffe99cebd0
fields <field_decl 0x7fffe98318c0 a type <real_type 0x7fffe982a3f0 long double>
XF x.c:2:15
size <integer_cst 0x7fffe9802fa8 constant 128>
unit-size <integer_cst 0x7fffe9802fc0 constant 16>
align:128 warn_if_not_align:0 offset_align 128 decl_not_flexarray: 1
offset <integer_cst 0x7fffe9802f90 constant 0>
bit-offset <integer_cst 0x7fffe9802fd8 constant 0> context <record_type 0x7fffe99cebd0> chain <field_decl 0x7fffe9831960 b>>>
used read BLK x.c:7:6 size <integer_cst 0x7fffe98242d0 256> unit-size <integer_cst 0x7fffe98243a8 32>
align:256 warn_if_not_align:0 context <function_decl 0x7fffe99d2900 e> arg-type <record_type 0x7fffe99cec78 c>>
(gdb)
PR debug/120849
* print-tree.cc (debug): New.
* print-tree.h (debug): Likewise.
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
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This fixes an error recovery issue, whereby the compilation of a string
concatenation with an illegal character constant hangs.
gcc/ada/
PR ada/120854
* sem_eval.adb (Get_String_Val): Be prepared for an integer literal
after a serious error is detected, and raise PE on other nodes.
gcc/testsuite/
* gnat.dg/concat6.adb: New test.
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Modules streaming needs to handle these differently from other unnamed
FIELD_DECLs that are streamed for internal RECORD_DECLs, and there
doesn't seem to be a good way to detect this case otherwise.
This matters only to allow for compiler-generated type definitions that
build FIELD_DECLs with no name, as otherwise they get confused.
Currently the only such types left I hadn't earlier fixed by giving
names to are contextless, for which we have an early check to mark their
fields as MK_unique anyway, but there may be other cases in the future.
gcc/cp/ChangeLog:
* module.cc (trees_out::walking_bit_field_unit): New flag.
(trees_out::trees_out): Initialize it.
(trees_out::core_vals): Set it.
(trees_out::get_merge_kind): Use it, move previous ad-hoc check
into assertion.
Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com>
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template [PR120644]
We were erroring because the TEMPLATE_DECL of the existing partial
specialisation has an undeduced return type, but the imported
declaration did not.
The root cause is similar to what was fixed in r13-2744-g4fac53d6522189,
where modules streaming code assumes that a TEMPLATE_DECL and its
DECL_TEMPLATE_RESULT will always have the same TREE_TYPE. That commit
fixed the issue by ensuring that when the type of a variable is deduced
the TEMPLATE_DECL is updated as well, but missed handling partial
specialisations. This patch ensures that the same adjustment is made
there as well.
PR c++/120644
gcc/cp/ChangeLog:
* decl.cc (cp_finish_decl): Also propagate type to partial
templates.
* module.cc (trees_out::decl_value): Add assertion that the
TREE_TYPE of a streamed template decl matches its inner.
(trees_in::is_matching_decl): Clarify function return type
deduction should only occur for non-TEMPLATE_DECL.
* pt.cc (template_for_substitution): Handle partial specs.
gcc/testsuite/ChangeLog:
* g++.dg/modules/auto-7.h: New test.
* g++.dg/modules/auto-7_a.H: New test.
* g++.dg/modules/auto-7_b.C: New test.
Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com>
Reviewed-by: Jason Merrill <jason@redhat.com>
Reviewed-by: Patrick Palka <ppalka@redhat.com>
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|
This fixes an ICE with -mno-lra when split2 tries to split the following
zero_extendsidi2 insn:
(set (reg:DI 24)
(zero_extend:DI (reg:SI **)))
The ICE is because avr_hard_regno_mode_ok allows R24:DI but disallows
R28:SI when Reload is used. R28:SI is a result of zero_extendsidi2.
This ICE only occurs with Reload (which will die before very long),
but it occurs when building libgcc.
gcc/
PR target/120856
* config/avr/avr.cc (avr_hard_regno_mode_ok) [-mno-lra]: Deny
hard regs >= 4 bytes that overlap Y.
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|
gcc/testsuite/ChangeLog:
PR target/120818
* g++.target/i386/shrink_wrap_separate.C: Relax the check.
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|
I have tested Kugan's patch on exchange2 and noticed multiple problems:
1) with LTO the translation from dwarf names to symbol names is disabled
since we free lang data sooner. I moved the offline pass upstream which
however also may make us miss clones intorduced betwen free lang data
and annotation. This is not very important right now and may be furhter
fixed by splitting off auto-profile-read and offline passes.
2) I noticed that we miss a lot of AFDO inlines because some code compares
name indexes for equality in belief that it compares symbol names. This
is not ture if we drop prefixes. For this reason I integrated get_original_name
into the renaming machinery which actually updates indexes so string table
conitnues to work as symbol table.
This lets me to drop
afdo_string_table->get_index (afdo_string_table->get_name (other->name ()))
hops that were introduced at some places
Now after renaming all afdo instances should go by DECL_ASSEMBLER_NAME
names.
3) Detection of realized offline instances had an ordering issue where we
omitted marking of those that were offlined later. Since we can now
lookup assembler names, I simplified the logic into single-pass.
autoprofiledbootstrapped/regteted x86_64-linux, comitted.
gcc/ChangeLog:
* auto-profile.cc (get_original_name): Only strip suffixes introduced
after auto-fdo annotation.
(string_table::get_index_by_decl): Simplify.
(string_table::add_name): New member function.
(string_table::read): Micro-optimize allocation.
(function_instance::get_function_instance_by_decl): Dump reasons
for failure; try to compensate lost discriminators.
(function_instance::merge): Simplify sanity check; do not check
for realized flag; fix merging of targets.
(function_instance::offline_if_in_set): Simplify.
(function_instance::dump): Sanity check that names are consistent.
(autofdo_source_profile::offline_external_functions): Also handle
stripping suffixes.
(walk_block): Move up in source.
(autofdo_source_profile::offline_unrealized_inlines): Also compute
realized functions.
(autofdo_source_profile::get_function_instance_by_name_index): Simplify.
(autofdo_source_profile::add_function_instance): Simplify.
(autofdo_source_profile::read): Do not strip suffxies; error on duplicates.
(mark_realized_functions): Remove.
(auto_profile): Do not call mark_realized_functions.
* passes.def: Move auto_profile_offline before free_lang_data.
gcc/testsuite/ChangeLog:
* gcc.dg/tree-prof/clone-test.c: New test.
* gcc.dg/tree-prof/clone-merge-1.c: Updae template.
Co-authored-by: Kugan Vivekanandarajah <kvivekananda@nvidia.com>
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Here we end up with "error reporting routines re-entered" because
resolve_nondeduced_context isn't passing complain to mark_used.
PR c++/120756
gcc/cp/ChangeLog:
* pt.cc (resolve_nondeduced_context): Pass complain to mark_used.
gcc/testsuite/ChangeLog:
* g++.dg/warn/deprecated-22.C: New test.
Reviewed-by: Jason Merrill <jason@redhat.com>
|
|
Jakub's constexpr virtual base patch allowed -fimplicit-constexpr to
interfere with these tests.
* g++.dg/abi/mangle81.C: Add -fno-implicit-constexpr.
* g++.dg/init/vbase1.C: Likewise.
* g++.dg/ipa/ipa-icf-4.C: Likewise.
|
|
fold_ctor_reference already punts on a CONSTRUCTOR whose type has reverse
storage order, but it can be invoked in a couple of places on a CONSTRUCTOR
with native storage order that has been wrapped in a VIEW_CONVERT_EXPR to a
type with reverse storage order; this would require a post adjustment that
does not currently exist, thus yield wrong code for this admittedly quite
pathological (but supported) case.
gcc/
* gimple-fold.cc (fold_const_aggregate_ref_1) <COMPONENT_REF>:
Bail out immediately if the reference has reverse storage order.
* tree-ssa-sccvn.cc (fully_constant_vn_reference_p): Likewise.
gcc/testsuite/
* gnat.dg/sso20.adb: New test.
|
|
The following patch implements the C++26
P3533R2 - constexpr virtual inheritance
paper.
The changes include not rejecting it for C++26, tweaking the
error wording to show that it is valid in C++26, adjusting
synthesized_method_walk not to make synthetized cdtors non-constexpr
just because of virtual base classes in C++26 and various tweaks in
constexpr.cc so that it can deal with the expressions used for
virtual base member accesses or cdtor calls which need __in_chrg
and/or __vtt_parm arguments to be passed in some cases implicitly when
they aren't passed explicitly. And dynamic_cast constant evaluation
tweaks so that it handles also expressions with types with virtual bases.
2025-06-27 Jakub Jelinek <jakub@redhat.com>
PR c++/120777
gcc/
* gimple-fold.cc (gimple_get_virt_method_for_vtable): Revert
2018-09-18 changes.
gcc/c-family/
* c-cppbuiltin.cc (c_cpp_builtins): Predefine
__cpp_constexpr_virtual_inheritance=202506L for C++26.
gcc/cp/
* constexpr.cc: Implement C++26 P3533R2 - constexpr virtual
inheritance.
(is_valid_constexpr_fn): Don't reject constexpr cdtors in classes
with virtual bases for C++26, adjust error wording.
(cxx_bind_parameters_in_call): Add ORIG_FUN argument, add
values for __in_chrg and __vtt_parm arguments when needed.
(cxx_eval_dynamic_cast_fn): Adjust function comment, HINT -1
should be possible. For C++26 if obj is cast from POINTER_PLUS_EXPR,
attempt to use cxx_fold_indirect_ref to simplify it and if successful,
build ADDR_EXPR of that.
(cxx_eval_call_expression): Add orig_fun variable, set it to
fun before looking through clones, pass it to
cxx_bind_parameters_in_call.
(reduced_constant_expression_p): Add SZ argument, pass DECL_SIZE
of FIELD_DECL e.index to recursive calls and don't return false
if SZ is non-NULL and there are unfilled fields with bit position
at or above SZ.
(cxx_fold_indirect_ref_1): Handle reading of vtables using
ptrdiff_t dynamic type instead of some pointer type. Set el_sz
to DECL_SIZE_UNIT value rather than TYPE_SIZE_UNIT of
DECL_FIELD_IS_BASE fields in classes with virtual bases.
(cxx_fold_indirect_ref): In canonicalize_obj_off lambda look
through COMPONENT_REFs with DECL_FIELD_IS_BASE in classes with
virtual bases and adjust off correspondingly. Remove assertion that
off is integer_zerop, pass tree_to_uhwi (off) instead of 0 to the
cxx_fold_indirect_ref_1 call.
* cp-tree.h (publicly_virtually_derived_p): Declare.
(reduced_constant_expression_p): Add another tree argument defaulted
to NULL_TREE.
* method.cc (synthesized_method_walk): Don't clear *constexpr_p
if there are virtual bases for C++26.
* class.cc (build_base_path): Compute fixed_type_p and
virtual_access before checks for build_simple_base_path instead of
after that and conditional cp_build_addr_expr. Use build_simple_path
if !virtual_access even when v_binfo is non-NULL.
(layout_virtual_bases): For build_base_field calls use
access_public_node rather than access_private_node if
publicly_virtually_derived_p.
(build_vtbl_initializer): Revert 2018-09-18 and 2018-12-11 changes.
(publicly_virtually_derived_p): New function.
gcc/testsuite/
* g++.dg/cpp26/constexpr-virt-inherit1.C: New test.
* g++.dg/cpp26/constexpr-virt-inherit2.C: New test.
* g++.dg/cpp26/constexpr-virt-inherit3.C: New test.
* g++.dg/cpp26/feat-cxx26.C: Add __cpp_constexpr_virtual_inheritance
tersts.
* g++.dg/cpp2a/constexpr-dtor3.C: Don't expect one error for C++26.
* g++.dg/cpp2a/constexpr-dtor16.C: Don't expect errors for C++26.
* g++.dg/cpp2a/constexpr-dynamic10.C: Likewise.
* g++.dg/cpp0x/constexpr-ice21.C: Likewise.
* g++.dg/cpp0x/constexpr-ice4.C: Likewise.
* g++.dg/abi/mangle1.C: Guard the test on c++23_down.
* g++.dg/abi/mangle81.C: New test.
* g++.dg/ipa/ipa-icf-4.C (A::A): For
__cpp_constexpr_virtual_inheritance >= 202506L add user provided
non-constexpr constructor.
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Commit r16-1633 introduced a regression for imported interfaces that were
not renamed-on-use, since the related logic did not take into account that
the absence of renaming could be represented by an empty string.
PR fortran/120784
gcc/fortran/ChangeLog:
* interface.cc (gfc_match_end_interface): Detect empty local_name.
gcc/testsuite/ChangeLog:
* gfortran.dg/interface_63.f90: Extend testcase.
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|
With Jakub's constexpr virtual base patch,
23_containers/vector/bool/cmp_c++20.cc failed the assert I add to
fixed_type_or_null, meaning that it returned the wrong value. Let's fix the
result as well as adding the assert, and fix cp_parser_binary_expression to
properly wrap any class-type calls in the operands in TARGET_EXPR even
within a decltype so we don't hit the assert.
gcc/cp/ChangeLog:
* class.cc (fixed_type_or_null): Handle class-type CALL_EXPR.
* parser.cc (cp_parser_binary_expression): Fix decltype_p handling.
|
|
[PR98375,PR118904]
The frontend creates some variables that need to be given unique names
for the TU so that they can unambiguously be accessed. Historically
this has been done with a global counter local to each place that needs
an internal label, but this doesn't work with modules as depending on
what declarations have been imported, some counter values may have
already been used.
This patch reworks the situation to instead have a single collection of
counters for the TU, and a new function 'generate_internal_label' that
gets the next label with given prefix using that counter. Modules
streaming can then use this function to regenerate new names on
stream-in for any such decls, guaranteeing uniqueness within the TU.
These labels should only be used for internal entities so there should
be no issues with the names differing from TU to TU; we will need to
handle this if we ever start checking ODR of definitions we're merging
but that's an issue for later.
For proof of concept, this patch makes use of the new API for
__builtin_source_location and ubsan; there are probably other places
in the frontend where this change will need to be made as well.
One other change this exposes is that both of these components rely
on the definition of the VAR_DECLs they create, so stream that too
for uncontexted variables.
PR c++/98735
PR c++/118904
gcc/cp/ChangeLog:
* cp-gimplify.cc (source_location_id): Remove.
(fold_builtin_source_location): Use generate_internal_label.
* module.cc (enum tree_tag): Add 'tt_internal_id' enumerator.
(trees_out::tree_value): Adjust assertion, write definitions
of uncontexted VAR_DECLs.
(trees_in::tree_value): Read variable definitions.
(trees_out::tree_node): Write internal labels, adjust assert.
(trees_in::tree_node): Read internal labels.
gcc/ChangeLog:
* tree.cc (struct identifier_hash): New type.
(struct identifier_count_traits): New traits.
(internal_label_nums): New hash map.
(generate_internal_label): New function.
(prefix_for_internal_label): New function.
* tree.h (IDENTIFIER_INTERNAL_P): New macro.
(generate_internal_label): Declare.
(prefix_for_internal_label): Declare.
* ubsan.cc (ubsan_ids): Remove.
(ubsan_type_descriptor): Use generate_internal_label.
(ubsan_create_data): Likewise.
gcc/testsuite/ChangeLog:
* g++.dg/modules/src-loc-1.h: New test.
* g++.dg/modules/src-loc-1_a.H: New test.
* g++.dg/modules/src-loc-1_b.C: New test.
* g++.dg/modules/src-loc-1_c.C: New test.
* g++.dg/modules/ubsan-1_a.C: New test.
* g++.dg/modules/ubsan-1_b.C: New test.
* g++.dg/ubsan/module-1-aux.cc: New test.
* g++.dg/ubsan/module-1.C: New test.
Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com>
Reviewed-by: Jason Merrill <jason@redhat.com>
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|
This type currently has a DECL_NAME of an IDENTIFIER_DECL. Although the
documentation indicates this is legal, this confuses modules streaming
which expects all RECORD_TYPEs to have a TYPE_DECL, which is used to
determine the context and merge key, etc.
PR c++/120040
gcc/cp/ChangeLog:
* constexpr.cc (cxx_eval_constant_expression): Handle TYPE_NAME
now being a TYPE_DECL rather than just an IDENTIFIER_NODE.
* init.cc (build_new_constexpr_heap_type): Build a TYPE_DECL for
the returned type; mark the type as artificial.
* module.cc (trees_out::type_node): Add some assertions.
gcc/testsuite/ChangeLog:
* g++.dg/modules/pr120040_a.C: New test.
* g++.dg/modules/pr120040_b.C: New test.
Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com>
Reviewed-by: Jason Merrill <jason@redhat.com>
|
|
Currently, most declarations must have a DECL_CONTEXT for modules
streaming to behave correctly, so that they can have an appropriate
merge key generated and be correctly deduplicated on import.
There are a few exceptions, however, for internally generated
declarations that will never be merged and don't necessarily have an
appropriate parent to key off for the context. One case that's come up
a few times is TYPE_DECLs, especially temporary RECORD_TYPEs used as
intermediaries within expressions.
Previously I've tried to give all such types a DECL_CONTEXT, but in some
cases that has ended up being infeasible, such as with the types
generated by UBSan (which are shared with the C frontend and don't know
their context, especially when created at global scope). Additionally,
these types often don't have many of the parts that a normal struct
declaration created via parsing user code would have, which confuses
module streaming.
Given that these types are typically intended to be one-off and unique
anyway, this patch instead adds support for by-value streaming of
uncontexted TYPE_DECLs. The patch only support streaming the bare
minimum amount of fields needed for the cases I've come across so far;
in general the preference should still be to ensure that DECL_CONTEXT is
set where possible.
PR c++/98735
PR c++/120040
gcc/cp/ChangeLog:
* module.cc (trees_out::tree_value): Write TYPE_DECLs.
(trees_in::tree_value): Read TYPE_DECLs.
(trees_out::tree_node): Support uncontexted TYPE_DECLs, and
ensure that all parts of a by-value decl are marked for
streaming.
(trees_out::get_merge_kind): Treat members of uncontexted types
as always unique.
Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com>
Reviewed-by: Jason Merrill <jason@redhat.com>
|
|
This patch should finish the oflining infrastructure by offlining
(prior AFDO annotation) all inline function instances that was not
early inlined. This is mostly the case of recursive inlining or when
-fno-auto-profile-inlining is used which sould now produce comparable
code.
I also cleaned up offlining of self-recursive functions which now
happens through the worklist and reduces problem with recursive ivocation
of the funciton merging modifying datastructures at unexpected places.
gcc/ChangeLog:
* auto-profile.cc (function_instance::set_name,
function_instance::set_realized, function_instnace::realized_p,
function_instance::set_in_worklist,
function_instance::clear_in_worklist,
function_instance::in_worklist_p): New member functions.
(function_instance::in_worklist, function_instance::realized_):
new.
(get_relative_location_for_locus): Break out from ....
(get_relative_location_for_stmt): ... here.
(function_instance::~function_instance): Sanity check that
removed function is not in worklist.
(function_instance::merge): Do not offline realized instances.
(function_instance::offline): Make private; add duplicate functions
to worklist rather then merging immediately.
(function_instance::offline_if_in_set): Cleanup.
(function_instance::remove_external_functions): Likewise.
(function_instance::offline_if_not_realized): New member function.
(autofdo_source_profile::offline_external_functions): Handle delayed
functions.
(autofdo_source_profile::offline_unrealized_inlines): New member function.
(walk_block): New function.
(mark_realized_functions): New function.
(afdo_annotate_cfg): Fix dump.
(auto_profile): Mark realized functions and offline rest; do not compute
fn summary.
gcc/testsuite/ChangeLog:
* gcc.dg/tree-prof/afdo-crossmodule-1.c: Update template.
|
|
Now that the patches for PR120424 are upstream, the last known bug
associated with avr+lra has been fixed: PR118591. So we can pull the
switch that turns on LRA per default.
This patch only sets -mlra per default. It doesn't do any Reload related
cleanup or removal from the avr backend, hence -mno-lra still works.
The only new problem is that gcc.dg/torture/pr64088.c fails with LRA
but not with Reload. Though that test case is awkward since it is UB
but expects the compiler to behave in a specific way which avr-gcc
doesn't do: PR116780.
This patch also avoids a relative recent ICE that breaks building libgcc:
R24:DI is allowed per hard_regno_mode_ok, but R26:SI is disallowed
for Reload for old reasons. Outcome is that a split2 pattern for
R24:DI = zero_extend:DI (R22:SI) runs into an ICE.
AVR-LibC builds fine with this patch.
The AVR-LibC testsuite passes without errors.
gcc/
PR target/113934
* config/avr/avr.opt (-mlra): Turn on per default.
|
|
Fix typo spotted by Bernhard Reutner-Fischer.
PR target/119971
gcc/testsuite/
* gcc.target/riscv/pr119971.c: Fix typo.
|
|
The following amends the SLP addsub pattern to also match blends
of .FMA/.FMS and form .FMADDSUB even when -ffp-contract=off.
PR tree-optimization/120808
* tree-vect-slp-patterns.cc (vect_match_expression_p):
Take a code_helper and also match calls.
(addsub_pattern::recognize): Handle .FMA/.FMS pairs
in addition to PLUS/MINUS.
(addsub_pattern::build): Adjust.
* gcc.dg/vect/bb-slp-pr120808.c: Now also expect FMADDSUB
patterns to be matched.
|
|
The following avoids re-analyzing the loop as epilogue when not
using partial vectors and the mode is the same as the autodetected
vector mode and that has a too high VF for a non-predicated loop.
This situation occurs almost always on x86 and saves us one
re-analysis unless --param vect-partial-vector-usage is non-default.
* tree-vectorizer.h (vect_chooses_same_modes_p): New
overload.
* tree-vect-stmts.cc (vect_chooses_same_modes_p): Likewise.
* tree-vect-loop.cc (vect_analyze_loop): Prune epilogue
analysis further when not using partial vectors.
|
|
The following fixes the computation of supports_partial_vectors which
is used to prune the set of modes to iterate over for epilog
vectorization. The used partial_vectors_supported_p predicate
only looks for while_ult while also support predication when
mask modes are integer modes as for AVX512.
I've noticed this isn't very effective on x86_64 anyway since
if the main loop mode is autodetected we skip re-analyzing
mode_i == 0, but then mode_i == 1 is usually the very same
large mode. A patch for this will follow, but this will
regress without the fix below.
* tree-vect-loop.cc (vect_analyze_loop): Consider AVX512
style masking when computing supports_partial_vectors.
|
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This patch adds a note to help users unfamiliar with modules terminology
understand how to declare main in a named module since P3618.
There doesn't appear to be an easy robust location available for "the
start of this declaration" that I could find to attach a fixit to, but
the explanation should suffice.
gcc/cp/ChangeLog:
* decl.cc (grokfndecl): Add explanation of how to attach to
global module.
Signed-off-by: Nathaniel Shead <nathanieloshead@gmail.com>
|
|
This fixes a small typo in the Label attributes docs.
gcc/ChangeLog:
* doc/extend.texi: Fix typo in unsed attribute docs.
|
|
Use the inner scalar mode of vector broadcast source in:
(set (reg:V8DF 394)
(vec_duplicate:V8DF (reg:V2DF 190 [ alpha ])))
to compute the vector mode for broadcast from vector source.
gcc/
PR target/120830
* config/i386/i386-features.cc (ix86_get_vector_cse_mode): Handle
vector broadcast source.
gcc/testsuite/
PR target/120830
* g++.target/i386/pr120830.C: New test.
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
|
|
An x86_64-linux-gnu native with ix86_frame_pointer_required modified
to return true for nonzero frames, to exercize
lra_update_fp2sp_elimination, reveals in stage1 testing that wrong
code is generated for gcc.c-torture/execute/ieee/fp-cmp-8l.c:
argp-to-sp eliminations are used for one_test to pass its arguments on
to *pos, and the sp offsets survive the disabling of that elimination.
We didn't really have to disable that elimination, but the x86 backend
disables eliminations to sp if frame_pointer_needed.
This change extends the catching of fp2sp eliminations to all (?)
eliminations to sp with nonzero offsets, since none of them can be
properly reversed and would silently lead to wrong code.
By accepting nonzero offsets, we bootstrap with
-maccumulate-outgoing-args on x86_64-linux-gnu (with
ix86_frame_pointer_required modified to return true on nonzero frame
size).
for gcc/ChangeLog
PR rtl-optimization/120424
* lra-eliminations.cc (elimination_2sp_occurred_p): Rename
from...
(elimination_fp2sp_occured_p): ... this. Adjust all uses.
(lra_eliminate_regs_1): Don't require a from-frame-pointer
elimination to set it.
(update_reg_eliminate): Likewise to test it.
|
|
When attempting to bootstrap arm-linux-gnueabihf with
{BOOT_C,T}FLAGS='-g -O2 -fnon-call-exceptions
-fstack-clash-protection', gmp fails to build in stage2: gen-fac's
mpz_and gets miscompiled.
A pseudo is initialized before a loop and used in a PRE_INC load
inside a loop. It gets spilled just as the fp2sp elimination is
disabled, and only the initialization gets adjusted with elimination
offsets. The unadjusted stack slot within the PRE_INC load ends up
reloaded later, but only when the FP offset has already missed its
chance to be adjusted.
Arrange for lra_eliminate_regs_1 to adjust autoinc addresses that are
MEMs themselves.
for gcc/ChangeLog
PR rtl-optimization/120424
* lra-eliminations.cc (lra_eliminate_regs_1): Adjust autoinc
addresses that are MEMs.
|
|
The various recent additions to lra_update_fp2sp_elimination rendered
it somewhat confusing, with intermixed groups of statements pertaining
to three different major actions: disabling the elimination,
recomputing live ranges, and spilling uses of the frame pointer.
Reorder them for readability.
for gcc/ChangeLog
PR rtl-optimization/120424
* lra-eliminations.cc (lra_update_fp2sp_elimination): Reorder
and regroup related statements.
|
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Deactivating the fp2sp elimination in lra_update_fp2sp_elimination
prevents update_reg_eliminate from propagating the fp2sp elimination
offset to the next chosen elimination, so it may retain -1 as the
prev_offset, and prev_offset will be taken as an already-applied
offset that needs to be compensated in the next round of spilling and
reloading. This affects, for example, crtbegin.o's
__do_global_dtors_aux on arm-linux-gnueabihf in a {BOOT_C,T}FLAGS='-O2
-g -fnon-call-exceptions -fstack-clash-protection' bootstrap.
Alas, just retaining that elimination causes spills to use the fp2sp
elimination, including applying sp offsets, which breaks e.g. an
x86_64-linux-gnu native bootstrap with ix86_frame_pointer_required
modified to return true on nonzero frame size.
The middle-ground solution is to keep the elimination active, so that
its offsets are applied and propagated on to the subsequent fp
elimination, but without introducing sp offsets, so that
e.g. pr103973-18.c on the modified x86_64-linux-gnu doesn't get
adjacent argument pushes of two adjacent on-stack temporaries ending
up pushing the same temporary because of undesired adjustments.
for gcc/ChangeLog
PR rtl-optimization/120424
* lra-eliminations.cc (lra_update_fp2sp_elimination):
Avoid sp offsets in further fp2sp eliminations...
(update_reg_eliminate): ... and restore to_rtx before assert
checking.
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If the frame size grows to nonzero, arm_frame_pointer_required may
flip to true under -fstack-clash-protection -fnon-call-exceptions, and
that may disable the fp2sp elimination part-way through lra.
If pseudos had got assigned to the frame pointer register before that,
they have to be spilled, and that requires complete live range
information. If !lra_reg_spill_p, lra_spill won't have live ranges
for such pseudos, and they could end up sharing spill slots with other
pseudos whose live ranges actually overlap.
This affects at least Ada.Strings.Wide_Superbounded.Super_Insert and
.Super_Replace_Slice in libgnat/a-stwisu.adb, when compiled with -O2
-fstack-clash-protection -march=armv7 (implied Thumb2), causing
acats-4's cdd2a01 to fail.
Recomputing live ranges including registers may renumber and compress
points, so we have to recompute the aggregated live ranges for
already-assigned spill slots as well.
As a safety net, reject empty live ranges when computing slot sharing.
for gcc/ChangeLog
PR rtl-optimization/120424
* lra-eliminations.cc (lra_update_fp2sp_elimination):
Compute complete live ranges and recompute slots' live ranges
if needed.
* lra-lives.cc (lra_reset_live_range_list): New.
(lra_complete_live_ranges): New.
* lra-spills.cc (assign_spill_hard_regs): Reject empty live
ranges.
(add_pseudo_to_slot): Likewise.
(lra_recompute_slots_live_ranges): New.
* lra-int.h (lra_reset_live_range_list): Declare.
(lra_complete_live_ranges): Declare.
(lra_recompute_slots_live_ranges): Declare.
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acats' fdd2a00.read is miscompiled on arm-linux-gnu with -O2
-fstack-clash-protection -march=armv7-a -marm: a clobbered scratch
register in a *iorsi3_compare0_scratch pattern gets initially assigned
to the frame pointer register, but at some point during lra the frame
size grows to nonzero, arm_frame_pointer_required flips to true, and
the fp2sp elimination has to be disabled, so the scratch register gets
spilled to a stack slot.
It needs to get the sfp elimination at that point, because later
rounds of elimination will assume the previous round's offset has
already been applied. But since scratch matches are not regarded as
eliminable by genoutput, we don't attempt elimination in the clobbered
stack slot MEM rtx.
Later on, lra issues a reload for that slot, using a new pseudo
allocated to a hardware register, that gets stored in the stack slot
after the original insn. Elimination in that reload store insn
eventually updates the elimination offset, but it's an incremental
update, assuming that the offset so far has already been applied.
Without applying the initial offset, the store ends up overlapping
with the function's register save area, corrupting a caller's
call-saved register.
AFAICT the old reload's elimination wouldn't be harmed by allowing
elimination in scratch operands, so I'm enabling eliminable for them
regardless. Should it be found to make a difference, we could
presumably set a different bit in eliminable to enable reload and lra
to tell them apart and behave accordingly.
for gcc/ChangeLog
PR rtl-optimization/120424
* genoutput.cc (scan_operands): Make MATCH_SCRATCHes eliminable.
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Even after we disable the fp2sp elimination when it is the active
elimination for the fp, spilling might use it before
update_reg_eliminate runs and inactivates it for good. If it is used,
update_reg_eliminate will fail the check that fp2sp was not used.
Since we keep track of uses of this specific elimination, and
lra_update_fp2sp_elimination checks it before disabling it, we know it
hasn't been used, so we can inactivate it without any ill effects.
This fixes the pr118591-1.c avr-none regression exposed by the
PR120424 fix.
for gcc/ChangeLog
PR rtl-optimization/120424
* lra-eliminations.cc (lra_update_fp2sp_elimination):
Inactivate the unused fp2sp elimination right away.
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