[PATCH] i386: Mark XMM4-XMM6 as clobbered by encodekey128/encodekey256

[H.J. Lu via Gcc-patches]

encodekey128 and encodekey256 operations clear XMM4-XMM6.  But it is
documented that XMM4-XMM6 are reserved for future usages and software
should not rely upon them being zeroed.  Change encodekey128 and
encodekey256 to clobber XMM4-XMM6.

gcc/

        PR target/107061
        * config/i386/predicates.md (encodekey128_operation): Check
        XMM4-XMM6 as clobbered.
        (encodekey256_operation): Likewise.
        * config/i386/sse.md (encodekey128u32): Clobber XMM4-XMM6.
        (encodekey256u32): Likewise.

gcc/testsuite/

        PR target/107061
        * gcc.target/i386/keylocker-encodekey128.c: Don't check
        XMM4-XMM6.
        * gcc.target/i386/keylocker-encodekey256.c: Likewise.
---
 gcc/config/i386/predicates.md                 | 20 +++++++++----------
 gcc/config/i386/sse.md                        |  4 ++--
 .../gcc.target/i386/keylocker-encodekey128.c  |  1 -
 .../gcc.target/i386/keylocker-encodekey256.c  |  1 -
 4 files changed, 12 insertions(+), 14 deletions(-)

diff --git a/gcc/config/i386/predicates.md b/gcc/config/i386/predicates.md
index 655eabf793b..c4141a96735 100644
--- a/gcc/config/i386/predicates.md
+++ b/gcc/config/i386/predicates.md
@@ -2107,11 +2107,11 @@ (define_predicate "encodekey128_operation"
   for(i = 4; i < 7; i++)
     {
       elt = XVECEXP (op, 0, i);
-      if (GET_CODE (elt) != SET
-         || GET_CODE (SET_DEST (elt)) != REG
-         || GET_MODE (SET_DEST (elt)) != V2DImode
-         || REGNO (SET_DEST (elt)) != GET_SSE_REGNO (i)
-         || SET_SRC (elt) != CONST0_RTX (V2DImode))
+      if (GET_CODE (elt) != CLOBBER
+         || GET_MODE (elt) != VOIDmode
+         || GET_CODE (XEXP (elt, 0)) != REG
+         || GET_MODE (XEXP (elt, 0)) != V2DImode
+         || REGNO (XEXP (elt, 0)) != GET_SSE_REGNO (i))
        return false;
     }
 
@@ -2157,11 +2157,11 @@ (define_predicate "encodekey256_operation"
   for(i = 4; i < 7; i++)
     {
       elt = XVECEXP (op, 0, i + 1);
-      if (GET_CODE (elt) != SET
-         || GET_CODE (SET_DEST (elt)) != REG
-         || GET_MODE (SET_DEST (elt)) != V2DImode
-         || REGNO (SET_DEST (elt)) != GET_SSE_REGNO (i)
-         || SET_SRC (elt) != CONST0_RTX (V2DImode))
+      if (GET_CODE (elt) != CLOBBER
+         || GET_MODE (elt) != VOIDmode
+         || GET_CODE (XEXP (elt, 0)) != REG
+         || GET_MODE (XEXP (elt, 0)) != V2DImode
+         || REGNO (XEXP (elt, 0)) != GET_SSE_REGNO (i))
        return false;
     }
 
diff --git a/gcc/config/i386/sse.md b/gcc/config/i386/sse.md
index 5c189635124..076064f97e6 100644
--- a/gcc/config/i386/sse.md
+++ b/gcc/config/i386/sse.md
@@ -29015,7 +29015,7 @@ (define_expand "encodekey128u32"
 
   for (i = 4; i < 7; i++)
     XVECEXP (operands[2], 0, i)
-      = gen_rtx_SET (xmm_regs[i], CONST0_RTX (V2DImode));
+      = gen_rtx_CLOBBER (VOIDmode, xmm_regs[i]);
 
   XVECEXP (operands[2], 0, 7)
     = gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (CCmode, FLAGS_REG));
@@ -29072,7 +29072,7 @@ (define_expand "encodekey256u32"
 
   for (i = 4; i < 7; i++)
     XVECEXP (operands[2], 0, i + 1)
-      = gen_rtx_SET (xmm_regs[i], CONST0_RTX (V2DImode));
+      = gen_rtx_CLOBBER (VOIDmode, xmm_regs[i]);
 
   XVECEXP (operands[2], 0, 8)
     = gen_rtx_CLOBBER (VOIDmode, gen_rtx_REG (CCmode, FLAGS_REG));
diff --git a/gcc/testsuite/gcc.target/i386/keylocker-encodekey128.c 
b/gcc/testsuite/gcc.target/i386/keylocker-encodekey128.c
index 805e0628673..57fa9bdc831 100644
--- a/gcc/testsuite/gcc.target/i386/keylocker-encodekey128.c
+++ b/gcc/testsuite/gcc.target/i386/keylocker-encodekey128.c
@@ -6,7 +6,6 @@
 /* { dg-final { scan-assembler "(?:movdqu|movups)\[ 
\\t\]+\[^\\n\]*%xmm0,\[^\\n\\r\]*" } } */
 /* { dg-final { scan-assembler "(?:movdqu|movups)\[ 
\\t\]+\[^\\n\]*%xmm1,\[^\\n\\r\]*16\[^\\n\\r\]*" } } */
 /* { dg-final { scan-assembler "(?:movdqu|movups)\[ 
\\t\]+\[^\\n\]*%xmm2,\[^\\n\\r\]*32\[^\\n\\r\]*" } } */
-/* { dg-final { scan-assembler "(?:movdqa|movaps)\[ 
\\t\]+\[^\\n\]*%xmm\[4-6\],\[^\\n\\r\]*" } } */
 
 #include <immintrin.h>
 
diff --git a/gcc/testsuite/gcc.target/i386/keylocker-encodekey256.c 
b/gcc/testsuite/gcc.target/i386/keylocker-encodekey256.c
index 26f04dcf014..a9398b4e7a2 100644
--- a/gcc/testsuite/gcc.target/i386/keylocker-encodekey256.c
+++ b/gcc/testsuite/gcc.target/i386/keylocker-encodekey256.c
@@ -8,7 +8,6 @@
 /* { dg-final { scan-assembler "(?:movdqu|movups)\[ 
\\t\]+\[^\\n\]*%xmm1,\[^\\n\\r\]*16\[^\\n\\r\]*" } } */
 /* { dg-final { scan-assembler "(?:movdqu|movups)\[ 
\\t\]+\[^\\n\]*%xmm2,\[^\\n\\r\]*32\[^\\n\\r\]*" } } */
 /* { dg-final { scan-assembler "(?:movdqu|movups)\[ 
\\t\]+\[^\\n\]*%xmm3,\[^\\n\\r\]*48\[^\\n\\r\]*" } } */
-/* { dg-final { scan-assembler "(?:movdqa|movaps)\[ 
\\t\]+\[^\\n\]*%xmm\[4-6\],\[^\\n\\r\]*" } } */
 
 #include <immintrin.h>
 
-- 
2.37.3