From: Tom Stellard <thomas.stellard@amd.com>
Date: Thu, 9 Jul 2015 16:30:36 +0000 (+0000)
Subject: AMDGPU/SI: The SIShrinkInstructions pass should only fold immediates with one use
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2b2d86178cc8bc4e57a85e544b30e28fb8b615a1;p=oota-llvm.git

AMDGPU/SI: The SIShrinkInstructions pass should only fold immediates with one use

This is convered by existing testcases and will be exposed by a future
commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241817 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/AMDGPU/SIShrinkInstructions.cpp b/lib/Target/AMDGPU/SIShrinkInstructions.cpp
index 51e72cdb5f9..cb9d7f7c59d 100644
--- a/lib/Target/AMDGPU/SIShrinkInstructions.cpp
+++ b/lib/Target/AMDGPU/SIShrinkInstructions.cpp
@@ -149,7 +149,7 @@ static void foldImmediates(MachineInstr &MI, const SIInstrInfo *TII,
     return;
 
   // Try to fold Src0
-  if (Src0.isReg()) {
+  if (Src0.isReg() && MRI.hasOneUse(Src0.getReg())) {
     unsigned Reg = Src0.getReg();
     MachineInstr *Def = MRI.getUniqueVRegDef(Reg);
     if (Def && Def->isMoveImmediate()) {