diff options
| author | Tom de Vries <tdevries@suse.de> | 2020-09-07 10:47:25 +0200 |
|---|---|---|
| committer | Tom de Vries <tdevries@suse.de> | 2020-09-11 12:06:15 +0200 |
| commit | 15545563128f0240192c263522d4a36b7f86250f (patch) | |
| tree | 746bb4c9e006aa697779062ec38bfd6e35ff6fea /gcc | |
| parent | 8ae0de5621120b16295fe6b73ca044d4c576af6d (diff) | |
| download | gcc-15545563128f0240192c263522d4a36b7f86250f.zip gcc-15545563128f0240192c263522d4a36b7f86250f.tar.gz gcc-15545563128f0240192c263522d4a36b7f86250f.tar.bz2 | |
[libatomic] Add nvptx support
Add nvptx support to libatomic.
Given that atomic_test_and_set is not implemented for nvptx (PR96964), the
compiler translates __atomic_test_and_set falling back onto the "Failing all
else, assume a single threaded environment and simply perform the operation"
case in expand_atomic_test_and_set, so it doesn't map onto an actual atomic
operation.
Still, that counts as supported for the configure test of libatomic, so we
end up with HAVE_ATOMIC_TAS_1/2/4/8/16 == 1, and the corresponding
__atomic_test_and_set_1/2/4/8/16 in libatomic all using that non-atomic
implementation.
Fix this by adding an atomic_test_and_set expansion for nvptx, that uses
libatomics __atomic_test_and_set_1.
This again makes the configure tests for HAVE_ATOMIC_TAS_1/2/4/8/16 fail, so
instead we use this case in tas_n.c:
...
/* If this type is smaller than word-sized, fall back to a word-sized
compare-and-swap loop. */
bool
SIZE(libat_test_and_set) (UTYPE *mptr, int smodel)
...
which for __atomic_test_and_set_8 uses INVERT_MASK_8.
Add INVERT_MASK_8 in libatomic_i.h, as well as MASK_8.
Tested libatomic testsuite on nvptx.
gcc/ChangeLog:
PR target/96964
* config/nvptx/nvptx.md (define_expand "atomic_test_and_set"): New
expansion.
libatomic/ChangeLog:
PR target/96898
* configure.tgt: Add nvptx.
* libatomic_i.h (MASK_8, INVERT_MASK_8): New macro definition.
* config/nvptx/host-config.h: New file.
* config/nvptx/lock.c: New file.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/config/nvptx/nvptx.md | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/gcc/config/nvptx/nvptx.md b/gcc/config/nvptx/nvptx.md index 4168190..6178e6a 100644 --- a/gcc/config/nvptx/nvptx.md +++ b/gcc/config/nvptx/nvptx.md @@ -1667,6 +1667,22 @@ "%.\\tatom%A1.b%T0.<logic>\\t%0, %1, %2;" [(set_attr "atomic" "true")]) +(define_expand "atomic_test_and_set" + [(match_operand:SI 0 "nvptx_register_operand") ;; bool success output + (match_operand:QI 1 "memory_operand") ;; memory + (match_operand:SI 2 "const_int_operand")] ;; model + "" +{ + rtx libfunc; + rtx addr; + libfunc = init_one_libfunc ("__atomic_test_and_set_1"); + addr = convert_memory_address (ptr_mode, XEXP (operands[1], 0)); + emit_library_call_value (libfunc, operands[0], LCT_NORMAL, SImode, + addr, ptr_mode, + operands[2], SImode); + DONE; +}) + (define_insn "nvptx_barsync" [(unspec_volatile [(match_operand:SI 0 "nvptx_nonmemory_operand" "Ri") (match_operand:SI 1 "const_int_operand")] |