From: liuhongt <hongtao.liu@intel.com>
Date: Fri, 22 Nov 2024 07:57:38 +0000 (-0800)
Subject: Fix uninitialized operands[2] in vec_unpacks_hi_v4sf.
X-Git-Tag: releases/gcc-12.5.0~429
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=89a27cf6b1354cc80d834d71f7a3aa137d605e94;p=thirdparty%2Fgcc.git

Fix uninitialized operands[2] in vec_unpacks_hi_v4sf.

It could cause weired spill in RA when register pressure is high.

gcc/ChangeLog:

	PR target/117562
	* config/i386/sse.md (vec_unpacks_hi_v4sf): Initialize
	operands[2] with CONST0_RTX.

(cherry picked from commit ba4cf2e296d8d5950c3d356fa6b6efcad00d0189)
---

diff --git a/gcc/config/i386/sse.md b/gcc/config/i386/sse.md
index 3ad96f321a67..09b308e03c7c 100644
--- a/gcc/config/i386/sse.md
+++ b/gcc/config/i386/sse.md
@@ -9129,7 +9129,10 @@
        (match_dup 2)
        (parallel [(const_int 0) (const_int 1)]))))]
   "TARGET_SSE2"
-  "operands[2] = gen_reg_rtx (V4SFmode);")
+{
+  operands[2] = gen_reg_rtx (V4SFmode);
+  emit_move_insn (operands[2], CONST0_RTX (V4SFmode));
+})
 
 (define_expand "vec_unpacks_hi_v8sf"
   [(set (match_dup 2)