From 6ef40b11f8331b80d72e7e5f2670d8e0eb190bb2 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Thu, 16 Jul 2009 06:31:37 +0000
Subject: [PATCH] use SUBREG_TO_REG instead of INSERT_SUBREG, this way the code
 generator can know the top bits are zero, not undefined. Thanks to Dan for
 pointing this out.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75899 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/X86Instr64bit.td | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Target/X86/X86Instr64bit.td b/lib/Target/X86/X86Instr64bit.td
index dd6f984144f..c4b25fca2fc 100644
--- a/lib/Target/X86/X86Instr64bit.td
+++ b/lib/Target/X86/X86Instr64bit.td
@@ -1309,7 +1309,7 @@ def Int_CVTTSS2SI64rm: RSSI<0x2C, MRMSrcMem, (outs GR64:$dst), (ins f32mem:$src)
 // when we have a better way to specify isel priority.
 let AddedComplexity = 1 in
 def : Pat<(i64 0),
-          (INSERT_SUBREG (i64 (IMPLICIT_DEF)), (MOV32r0), x86_subreg_32bit)>;
+          (SUBREG_TO_REG (i64 0), (MOV32r0), x86_subreg_32bit)>;
 
 
 // Materialize i64 constant where top 32-bits are zero.