From 1c17c1bc54335564e86bdb7c5e87383feddbc729 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Tue, 22 Sep 2009 00:29:40 +0000
Subject: [PATCH] Minor bug fix. LowerSubregs should translate %S0<def> =
 EXTRACT_SUBREG %Q0<kill>, 1 to %S0<def> = IMPLICIT_DEF %Q0<imp-use,kill>

Implicit_def does not *read* any register so the operand should be marked "implicit". The missing "implicit" marker on the operand is wrong, but it doesn't actually break anything.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82503 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/LowerSubregs.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/CodeGen/LowerSubregs.cpp b/lib/CodeGen/LowerSubregs.cpp
index 812d97d66c3..f3157f008b9 100644
--- a/lib/CodeGen/LowerSubregs.cpp
+++ b/lib/CodeGen/LowerSubregs.cpp
@@ -130,6 +130,7 @@ bool LowerSubregsInstructionPass::LowerExtract(MachineInstr *MI) {
       // instruction with IMPLICIT_DEF.
       MI->setDesc(TII.get(TargetInstrInfo::IMPLICIT_DEF));
       MI->RemoveOperand(2);     // SubIdx
+      MI->getOperand(1).setImplicit(true);
       DEBUG(errs() << "subreg: replace by: " << *MI);
       return true;
     }