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| author | Alan Modra <amodra@gmail.com> | 2016-09-29 07:31:48 +0930 |
|---|---|---|
| committer | Alan Modra <amodra@gcc.gnu.org> | 2016-09-29 07:31:48 +0930 |
| commit | e9dda04f0760e78c5834b1beddab39cd562ad7c1 (patch) | |
| tree | 7d561e18cf4ecf2d793c4c34f392eac627e6209d /gcc/doc | |
| parent | 91eaca5e32abab6179fba0e2543daf1cc1f64bde (diff) | |
| download | gcc-e9dda04f0760e78c5834b1beddab39cd562ad7c1.zip gcc-e9dda04f0760e78c5834b1beddab39cd562ad7c1.tar.gz gcc-e9dda04f0760e78c5834b1beddab39cd562ad7c1.tar.bz2 | |
[RS6000] .gnu.attributes Tag_GNU_Power_ABI_FP
Extend this attribute to cover long double ABIs, for 64-bit too.
This patch also corrects an error that crept in to code setting
rs6000_passes_float. See the added comment. Passing IEEE128 values
in vsx regs ought to set both Tag_GNU_Power_ABI_FP and
Tag_GNU_Power_ABI_Vector. Also adds a new option, default on, that
disables output of .gnu_attribute assembly directives.
* config/rs6000/sysv4.opt (mgnu-attribute): New option.
* doc/invoke.texi: Document it.
* config/rs6000/rs6000.c (HAVE_LD_PPC_GNU_ATTR_LONG_DOUBLE): Define.
(rs6000_passes_float): Comment.
(rs6000_passes_long_double): New static var.
(call_ABI_of_interest): Return false unless rs6000_gnu_attr is set.
(init_cumulative_args): Set up to emit fp .gnu_attribute for
ELF 64-bit ABIs as well as 32-bit ELF. Correct rs6000_passes_float
to include fp values returned in vectors.
Set rs6000_passes_long_double.
(rs6000_function_arg_advance_1): Likewise for function args.
(rs6000_elf_file_end): Emit fp .gnu_attribute for ELF 64-bit ABIs,
and SPE. Emit long double tag value too.
(rs6000_opt_vars): Add gnu-attr.
* configure.ac (HAVE_LD_PPC_GNU_ATTR_LONG_DOUBLE): New ppc32 test.
* configure: Regenerate.
* config.in: Regenerate.
From-SVN: r240601
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index 6767462..8a84e4f 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -1017,6 +1017,7 @@ See RS/6000 and PowerPC Options. -mupper-regs-di -mno-upper-regs-di @gol -mupper-regs -mno-upper-regs @gol -mfloat128 -mno-float128 -mfloat128-hardware -mno-float128-hardware @gol +-mgnu-attribute -mno-gnu-attribute @gol -mlra -mno-lra} @emph{RX Options} @@ -21299,6 +21300,14 @@ This is the default ABI for little-endian PowerPC 64-bit Linux. Overriding the default ABI requires special system support and is likely to fail in spectacular ways. +@item -mgnu-attribute +@itemx -mno-gnu-attribute +@opindex mgnu-attribute +@opindex mno-gnu-attribute +Emit .gnu_attribute assembly directives to set tag/value pairs in a +.gnu.attributes section that specify ABI variations in function +parameters or return values. + @item -mprototype @itemx -mno-prototype @opindex mprototype |