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| author | Hongyu Wang <hongyu.wang@intel.com> | 2024-01-09 15:00:21 +0800 |
|---|---|---|
| committer | Hongyu Wang <hongyu.wang@intel.com> | 2024-01-10 16:02:36 +0800 |
| commit | 7de5bb642c1265ff57a009dd889ab435b098bfca (patch) | |
| tree | 90c04abe30769232d6722453d2ef686d2d1bbbe9 | |
| parent | 0141ee79d72a3bccf040e02cd047fe585b96fa8d (diff) | |
| download | gcc-7de5bb642c1265ff57a009dd889ab435b098bfca.zip gcc-7de5bb642c1265ff57a009dd889ab435b098bfca.tar.gz gcc-7de5bb642c1265ff57a009dd889ab435b098bfca.tar.bz2 | |
i386: [APX] Document inline asm behavior and new switch for APX
For APX, the inline asm behavior was not mentioned in any document
before. Add description for it.
gcc/ChangeLog:
* config/i386/i386.opt: Adjust document.
* doc/invoke.texi: Add description for
-mapx-inline-asm-use-gpr32.
| -rw-r--r-- | gcc/config/i386/i386.opt | 3 | ||||
| -rw-r--r-- | gcc/doc/invoke.texi | 8 |
2 files changed, 9 insertions, 2 deletions
diff --git a/gcc/config/i386/i386.opt b/gcc/config/i386/i386.opt index a38e92b..5b4f1bf 100644 --- a/gcc/config/i386/i386.opt +++ b/gcc/config/i386/i386.opt @@ -1357,8 +1357,7 @@ Enum(apx_features) String(all) Value(apx_all) Set(1) mapx-inline-asm-use-gpr32 Target Var(ix86_apx_inline_asm_use_gpr32) Init(0) -Enable GPR32 in inline asm when APX_EGPR enabled, do not -hook reg or mem constraint in inline asm to GPR16. +Enable GPR32 in inline asm when APX_F enabled. mevex512 Target Mask(ISA2_EVEX512) Var(ix86_isa_flags2) Save diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index a494420..216e2f5 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -35272,6 +35272,14 @@ r8-r15 registers so that the call and jmp instruction length is 6 bytes to allow them to be replaced with @samp{lfence; call *%r8-r15} or @samp{lfence; jmp *%r8-r15} at run-time. +@opindex mapx-inline-asm-use-gpr32 +@item -mapx-inline-asm-use-gpr32 +For inline asm support with APX, by default the EGPR feature was +disabled to prevent potential illegal instruction with EGPR occurs. +To invoke egpr usage in inline asm, use new compiler option +-mapx-inline-asm-use-gpr32 and user should ensure the instruction +supports EGPR. + @end table These @samp{-m} switches are supported in addition to the above |