[gcc r15-4175] x86/{,V}AES: adjust when to force EVEX encoding

[Jan Beulich via Gcc-cvs]

https://gcc.gnu.org/g:0ab66f099bf0f405542944c5ce178151bea934b2

commit r15-4175-g0ab66f099bf0f405542944c5ce178151bea934b2
Author: Jan Beulich <jbeul...@suse.com>
Date:   Tue Oct 8 16:05:33 2024 +0200

    x86/{,V}AES: adjust when to force EVEX encoding
    
    Commit a79d13a01f8c ("i386: Fix aes/vaes patterns [PR114576]") correctly
    said "..., but we need to emit {evex} prefix in the assembly if AES ISA
    is not enabled". Yet it did so only for the TARGET_AES insns. Going from
    the alternative chosen in the TARGET_VAES insns isn't quite right: If
    AES is (also) enabled, EVEX encoding would needlessly be forced.
    
    gcc/
    
            * config/i386/sse.md (vaesdec_<mode>, vaesdeclast_<mode>,
            vaesenc_<mode>, vaesenclast_<mode>): Replace which_alternative
            check by TARGET_AES one.

Diff:
---
 gcc/config/i386/sse.md | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/gcc/config/i386/sse.md b/gcc/config/i386/sse.md
index d6e2135423d0..ccef3e063eca 100644
--- a/gcc/config/i386/sse.md
+++ b/gcc/config/i386/sse.md
@@ -30803,7 +30803,7 @@
          UNSPEC_VAESDEC))]
   "TARGET_VAES"
 {
-  if (which_alternative == 0 && <MODE>mode == V16QImode)
+  if (!TARGET_AES && <MODE>mode == V16QImode)
     return "%{evex%} vaesdec\t{%2, %1, %0|%0, %1, %2}";
   else
     return "vaesdec\t{%2, %1, %0|%0, %1, %2}";
@@ -30817,7 +30817,7 @@
          UNSPEC_VAESDECLAST))]
   "TARGET_VAES"
 {
-  if (which_alternative == 0 && <MODE>mode == V16QImode)
+  if (!TARGET_AES && <MODE>mode == V16QImode)
     return "%{evex%} vaesdeclast\t{%2, %1, %0|%0, %1, %2}";
   else
     return "vaesdeclast\t{%2, %1, %0|%0, %1, %2}";
@@ -30831,7 +30831,7 @@
          UNSPEC_VAESENC))]
   "TARGET_VAES"
 {
-  if (which_alternative == 0 && <MODE>mode == V16QImode)
+  if (!TARGET_AES && <MODE>mode == V16QImode)
     return "%{evex%} vaesenc\t{%2, %1, %0|%0, %1, %2}";
   else
     return "vaesenc\t{%2, %1, %0|%0, %1, %2}";
@@ -30845,7 +30845,7 @@
          UNSPEC_VAESENCLAST))]
   "TARGET_VAES"
 {
-  if (which_alternative == 0 && <MODE>mode == V16QImode)
+  if (!TARGET_AES && <MODE>mode == V16QImode)
     return "%{evex%} vaesenclast\t{%2, %1, %0|%0, %1, %2}";
   else
     return "vaesenclast\t{%2, %1, %0|%0, %1, %2}";