[PATCH 1/2] Don't issue vzeroupper for vzeroupper call_insn.

[liuhongt via Gcc-patches]

Bootstrapped and regtested on x86_64-pc-linux-gnu{-m32,}.
Ok for trunk?

gcc/ChangeLog:

        PR target/82735
        * config/i386/i386.cc (ix86_avx_u127_mode_needed): Don't emit
        vzeroupper for vzeroupper call_insn.

gcc/testsuite/ChangeLog:

        * gcc.target/i386/avx-vzeroupper-30.c: New test.
---
 gcc/config/i386/i386.cc                           |  5 +++--
 gcc/testsuite/gcc.target/i386/avx-vzeroupper-30.c | 15 +++++++++++++++
 2 files changed, 18 insertions(+), 2 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/i386/avx-vzeroupper-30.c

diff --git a/gcc/config/i386/i386.cc b/gcc/config/i386/i386.cc
index 0761965344b..caca74d6dec 100644
--- a/gcc/config/i386/i386.cc
+++ b/gcc/config/i386/i386.cc
@@ -14489,8 +14489,9 @@ ix86_avx_u128_mode_needed (rtx_insn *insn)
         modes wider than 256 bits.  It's only safe to issue a
         vzeroupper if all SSE registers are clobbered.  */
       const function_abi &abi = insn_callee_abi (insn);
-      if (!hard_reg_set_subset_p (reg_class_contents[SSE_REGS],
-                                 abi.mode_clobbers (V4DImode)))
+      if (vzeroupper_pattern (PATTERN (insn), VOIDmode)
+         || !hard_reg_set_subset_p (reg_class_contents[SSE_REGS],
+                                    abi.mode_clobbers (V4DImode)))
        return AVX_U128_ANY;
 
       return AVX_U128_CLEAN;
diff --git a/gcc/testsuite/gcc.target/i386/avx-vzeroupper-30.c 
b/gcc/testsuite/gcc.target/i386/avx-vzeroupper-30.c
new file mode 100644
index 00000000000..c1c9baa8fc4
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/avx-vzeroupper-30.c
@@ -0,0 +1,15 @@
+/* { dg-do compile } */
+/* { dg-options "-O2 -mavx -mvzeroupper -dp" } */
+
+#include <immintrin.h>
+
+extern __m256 x, y;
+
+void
+foo ()
+{
+  x = y;
+  _mm256_zeroupper ();
+}
+
+/* { dg-final { scan-assembler-times "avx_vzeroupper" 1 } } */
-- 
2.39.1.388.g2fc9e9ca3c