[PATCH] Generate vpblendd instead of vpblendw for V4SI under AVX2.

[liuhongt via Gcc-patches]

Bootstrapped and regtested on x86_64-pc-linux-gnu{-m32,}
Ok for GCC14 stage-1(or maybe trunk)?

gcc/ChangeLog:

        * config/i386/i386-expand.cc (expand_vec_perm_blend): Generate
        vpblendd instead of vpblendw for V4SI under avx2.

gcc/testsuite/ChangeLog:

        * gcc.target/i386/pr88828-0.c: Adjust testcase.
---
 gcc/config/i386/i386-expand.cc            | 18 ++++++++++++++----
 gcc/testsuite/gcc.target/i386/pr88828-0.c |  2 +-
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/gcc/config/i386/i386-expand.cc b/gcc/config/i386/i386-expand.cc
index c1300dc4e26..1c436262ee5 100644
--- a/gcc/config/i386/i386-expand.cc
+++ b/gcc/config/i386/i386-expand.cc
@@ -19069,10 +19069,20 @@ expand_vec_perm_blend (struct expand_vec_perm_d *d)
       goto do_subreg;
 
     case E_V4SImode:
-      for (i = 0; i < 4; ++i)
-       mask |= (d->perm[i] >= 4 ? 3 : 0) << (i * 2);
-      vmode = V8HImode;
-      goto do_subreg;
+      if (TARGET_AVX2)
+       {
+         /* Use vpblendd instead of vpblendw.  */
+         for (i = 0; i < nelt; ++i)
+           mask |= ((unsigned HOST_WIDE_INT) (d->perm[i] >= nelt)) << i;
+         break;
+       }
+      else
+       {
+         for (i = 0; i < 4; ++i)
+           mask |= (d->perm[i] >= 4 ? 3 : 0) << (i * 2);
+         vmode = V8HImode;
+         goto do_subreg;
+       }
 
     case E_V16QImode:
       /* See if bytes move in pairs so we can use pblendw with
diff --git a/gcc/testsuite/gcc.target/i386/pr88828-0.c 
b/gcc/testsuite/gcc.target/i386/pr88828-0.c
index 3ddb2d13526..441c441b51d 100644
--- a/gcc/testsuite/gcc.target/i386/pr88828-0.c
+++ b/gcc/testsuite/gcc.target/i386/pr88828-0.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-options "-O2 -msse4.2" } */
+/* { dg-options "-O2 -msse4.2 -mno-avx2" } */
 
 typedef int v4si __attribute__((vector_size(16)));
 typedef float v4sf __attribute__((vector_size(16)));
-- 
2.39.1.388.g2fc9e9ca3c