From: liuhongt <hongtao.liu@intel.com>
Date: Tue, 20 Aug 2024 06:41:00 +0000 (+0800)
Subject: Align predicates for operands[1] between mov<mode> and *mov<mode>_internal.
X-Git-Tag: basepoints/gcc-16~6495
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bb42c551905024ea23095a0eb7b58fdbcfbcaef6;p=thirdparty%2Fgcc.git

Align predicates for operands[1] between mov<mode> and *mov<mode>_internal.

 > It's not obvious to me why movv16qi requires a nonimmediate_operand
> > source, especially since ix86_expand_vector_mode does have code to
> > cope with constant operand[1]s.  emit_move_insn_1 doesn't check the
> > predicates anyway, so the predicate will have little effect.
> >
> > A workaround would be to check legitimate_constant_p instead of the
> > predicate, but I'm not sure that that should be necessary.
> >
> > Has this already been discussed?  If not, we should loop in the x86
> > maintainers (but I didn't do that here in case it would be a repeat).
>
> I also noticed it. Not sure why movv16qi requires a
> nonimmediate_operand, while ix86_expand_vector_mode could deal with
> constant op. Looking forward to Hongtao's comments.
The code has been there since 2005 before I'm involved.
 It looks to me at the beginning both mov<mode> and
*mov<mode>_internal only support nonimmediate_operand for the
operands[1].
And r0-75606-g5656a184e83983 adjusted the nonimmediate_operand to
nonimmediate_or_sse_const_operand for *mov<mode>_internal, but not for
mov<mode>. I think we can align the predicate between mov<mode>
and *mov<mode>_internal.

gcc/ChangeLog:

	* config/i386/sse.md (mov<mode>): Align predicates for
	operands[1] between mov<mode> and *mov<mode>_internal.
	* config/i386/mmx.md (mov<mode>): Ditto.
---

diff --git a/gcc/config/i386/mmx.md b/gcc/config/i386/mmx.md
index 94d3a6e5692..cb2697537a8 100644
--- a/gcc/config/i386/mmx.md
+++ b/gcc/config/i386/mmx.md
@@ -169,7 +169,7 @@
 
 (define_expand "mov<mode>"
   [(set (match_operand:MMXMODE 0 "nonimmediate_operand")
-	(match_operand:MMXMODE 1 "nonimmediate_operand"))]
+	(match_operand:MMXMODE 1 "nonimm_or_0_operand"))]
   "TARGET_MMX || TARGET_MMX_WITH_SSE"
 {
   ix86_expand_vector_move (<MODE>mode, operands);
diff --git a/gcc/config/i386/sse.md b/gcc/config/i386/sse.md
index 8f34c9300d0..e67d25f960e 100644
--- a/gcc/config/i386/sse.md
+++ b/gcc/config/i386/sse.md
@@ -1387,7 +1387,7 @@
 
 (define_expand "mov<mode>"
   [(set (match_operand:VMOVE 0 "nonimmediate_operand")
-	(match_operand:VMOVE 1 "nonimmediate_operand"))]
+	(match_operand:VMOVE 1 "nonimmediate_or_sse_const_operand"))]
   "TARGET_SSE"
 {
   ix86_expand_vector_move (<MODE>mode, operands);