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| author | Uros Bizjak <ubizjak@gmail.com> | 2006-11-15 17:21:58 +0100 |
|---|---|---|
| committer | Uros Bizjak <uros@gcc.gnu.org> | 2006-11-15 17:21:58 +0100 |
| commit | 47a37ce45e4feb8cd84a315353a2077c9fbda747 (patch) | |
| tree | 764fb41a529e8c99e2fdcd06f12aed4fa7003f09 /gcc/doc/extend.texi | |
| parent | ab25c2d92002803f424e096520a945d67f12616f (diff) | |
| download | gcc-47a37ce45e4feb8cd84a315353a2077c9fbda747.zip gcc-47a37ce45e4feb8cd84a315353a2077c9fbda747.tar.gz gcc-47a37ce45e4feb8cd84a315353a2077c9fbda747.tar.bz2 | |
i386.opt: New target option -mx87regparm.
* config/i386/i386.opt: New target option -mx87regparm.
* config/i386/i386.h (struct ix86_args): Add x87_nregs, x87_regno,
float_in_x87: Add new variables. mmx_words, sse_words: Remove.
(X87_REGPARM_MAX): Define.
* config/i386/i386.c (override_options): Error out for
-mx87regparm but no 80387 support.
(ix86_attribute_table): Add x87regparm.
(ix86_handle_cconv_attribute): Update comments for x87regparm.
(ix86_comp_type_attributes): Check for mismatched x87regparm types.
(ix86_function_x87regparm): New function.
(ix86_function_arg_regno_p): Add X87_REGPARM_MAX 80387 floating
point registers.
(init_cumulative_args): Initialize x87_nregs and float_in_x87
variables.
(function_arg_advance): Process x87_nregs and x87_regno when
floating point argument is to be passed in 80387 register.
(function_arg): Pass XFmode arguments in 80387 registers for local
functions. Pass SFmode and DFmode arguments to local functions
in 80387 registers when flag_unsafe_math_optimizations is set.
* reg-stack.c (convert_regs_entry): Disable NaN load for
stack registers that are used for argument passing.
* doc/extend.texi: Document x87regparm function attribute.
* doc/invoke.texi: Document -mx87regparm.
testsuite/ChangeLog:
* gcc.target/i386/x87regparm-1.c: New test.
* gcc.target/i386/x87regparm-2.c: New test.
* gcc.target/i386/x87regparm-3.c: New test.
* gcc.target/i386/x87regparm-4.c: New test.
From-SVN: r118859
Diffstat (limited to 'gcc/doc/extend.texi')
| -rw-r--r-- | gcc/doc/extend.texi | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index 2a1391e..099e4dd 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -2221,6 +2221,14 @@ safe since the loaders there save all registers. (Lazy binding can be disabled with the linker or the loader if desired, to avoid the problem.) +@item x87regparm +@cindex @code{x87regparm} attribute +On the Intel x86 with 80387 @code{x87regparm} attribute causes the +compiler to pass up to 3 floating point arguments in 80387 registers +instead of on the stack. Functions that take a variable number of +arguments will continue to pass all of their floating point arguments +on the stack. + @item sseregparm @cindex @code{sseregparm} attribute On the Intel 386 with SSE support, the @code{sseregparm} attribute |