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author | John David Anglin <dave@hiauly1.hia.nrc.ca> | 2002-10-31 03:13:44 +0000 |
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committer | John David Anglin <danglin@gcc.gnu.org> | 2002-10-31 03:13:44 +0000 |
commit | a02aa5b099b5da28ce96a3ad4e5cfb0e23b34e37 (patch) | |
tree | f47286e288d980615f8a9fbf886fb3a2f0dffa4e /gcc/doc | |
parent | 8c081e84f7b8dbc477c62c5a16834e2f6ce9d095 (diff) | |
download | gcc-a02aa5b099b5da28ce96a3ad4e5cfb0e23b34e37.zip gcc-a02aa5b099b5da28ce96a3ad4e5cfb0e23b34e37.tar.gz gcc-a02aa5b099b5da28ce96a3ad4e5cfb0e23b34e37.tar.bz2 |
pa-linux.h (ASM_OUTPUT_EXTERNAL_LIBCALL): Define.
* pa-linux.h (ASM_OUTPUT_EXTERNAL_LIBCALL): Define.
* pa-protos.h (attr_length_millicode_call, attr_length_call,
pa_init_machine_status): Declare new global functions.
* pa.c (void copy_fp_args, length_fp_args, get_plabel): Declare and
implement new functions.
(attr_length_millicode_call, attr_length_call): Implement.
(total_code_bytes): Change type to long.
(pa_output_function_prologue): Compute total_code_bytes on TARGET_64BIT.
Reset counter if flag_function_sections.
(output_deferred_plabels): Set output alignment to 3 for TARGET_64BIT.
(output_cbranch): Move call to gen_label_rtx.
(output_millicode_call): Rewrite adding long TARGET_64BIT call, expose
delay slot in all variants, shorten pc-relative calls.
(output_call): Rewrite adding long TARGET_64BIT call, improved delay
slot usage and exposure, various new call variants, and shortened
sequences for some variants on TARGET_PA_20.
Miscellaneous format changes.
* pa.h (total_code_bytes): Change type to long.
(MASK_LONG_CALLS, TARGET_LONG_CALLS, TARGET_LONG_ABS_CALL,
TARGET_LONG_PIC_SDIFF_CALL, TARGET_LONG_PIC_PCREL_CALL): Define.
(TARGET_SWITCHES): Add "-mlong-calls" and "-mno-long-calls" options.
(EXTRA_CONSTRAINT, GO_IF_LEGITIMATE_ADDRESS,
LEGITIMIZE_RELOAD_ADDRESS): Don't use long floating point loads and
stores on TARGET_ELF32.
*pa.md (define_delay): Allow insns in delay on TARGET_PORTABLE_RUNTIME.
(unnamed patterns for mulsi3, divsi3, udivsi3, modsi3, umodsi3 and
canonicalize_funcptr_for_compare expanders): Calculate attribute length
attr_length_millicode_call().
(call_internal_symref, call_value_internal_symref): Clobber register 1.
Calculate attribute length using attr_length_call().
(call_internal_reg_64bit, call_value_internal_reg_64bit): Move gp load
to delay slot.
(sibcall, sibcall_value): Rewrite.
(sibcall_internal_symref, sibcall_value_internal_symref): Clobber
register 1. Use attr_length_call().
(sibcall_internal_symref_64bit, sibcall_value_internal_symref_64bit):
New patterns.
(unamed pattern for canonicalize_funcptr_for_compare): Rewrite.
* som.h (MEMBER_TYPE_FORCES_BLK): Define.
* t-pa64 (TARGET_LIBGCC2_CFLAGS): Add "-mlong-calls".
* doc/invoke.texi (mlong-calls): Document.
From-SVN: r58665
Diffstat (limited to 'gcc/doc')
-rw-r--r-- | gcc/doc/invoke.texi | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 43acaac..7d994b1 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -508,7 +508,7 @@ in the following sections. -march=@var{architecture-type} @gol -mbig-switch -mdisable-fpregs -mdisable-indexing @gol -mfast-indirect-calls -mgas -mgnu-ld -mhp-ld @gol --mjump-in-delay -mlinker-opt @gol +-mjump-in-delay -mlinker-opt -mlong-calls @gol -mlong-load-store -mno-big-switch -mno-disable-fpregs @gol -mno-disable-indexing -mno-fast-indirect-calls -mno-gas @gol -mno-jump-in-delay -mno-long-load-store @gol @@ -8094,6 +8094,33 @@ configure option, gcc's program search path, and finally by the user's @env{PATH}. The linker used by GCC can be printed using @samp{which `gcc -print-prog-name=ld`}. +@item -mlong-calls +@opindex mno-long-calls +Generate code that uses long call sequences. This ensures that a call +is always able to reach linker generated stubs. The default is to generate +long calls only when the distance from the call site to the beginning +of the function or translation unit, as the case may be, exceeds a +predefined limit set by the branch type being used. The limits for +normal calls are 7,600,000 and 240,000 bytes, respectively for the +PA 2.0 and PA 1.X architectures. Sibcalls are always limited at +240,000 bytes. + +Distances are measured from the beginning of functions when using the +@option{-ffunction-sections} option, or when using the @option{-mgas} +and @option{-mno-portable-runtime} options together under HP-UX with +the SOM linker. + +It is normally not desirable to use this option as it will degrade +performance. However, it may be useful in large applications, +particularly when partial linking is used to build the application. + +The types of long calls used depends on the capabilities of the +assembler and linker, and the type of code being generated. The +impact on systems that support long absolute calls, and long pic +symbol-difference or pc-relative calls should be relatively small. +However, an indirect call is used on 32-bit ELF systems in pic code +and it is quite long. + @end table @node Intel 960 Options |