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i386: [APX] Document inline asm behavior and new switch for APX

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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.
This commit is contained in:
Hongyu Wang
2024-01-09 15:00:21 +08:00
parent 0141ee79d7
commit 7de5bb642c
2 changed files with 9 additions and 2 deletions
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3
gcc/config/i386/i386.opt
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@@ -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

8
gcc/doc/invoke.texi
View File

@@ -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