From: Tom Stellard <thomas.stellard@amd.com>
Date: Tue, 4 Feb 2014 17:18:42 +0000 (+0000)
Subject: R600/SI: Don't assume copies will be coalesced in SIFixSGPRCopies
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=0c7a6b6477cac6192712b14016e706fd100172b1;p=oota-llvm.git

R600/SI: Don't assume copies will be coalesced in SIFixSGPRCopies

There is no lit test for this, because it would be too big and
complicated, but it does fix a crash in the Arithm/Absdiff.* OpenCV test.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200775 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/R600/SIFixSGPRCopies.cpp b/lib/Target/R600/SIFixSGPRCopies.cpp
index 3370c7955bc..f0065ea13c5 100644
--- a/lib/Target/R600/SIFixSGPRCopies.cpp
+++ b/lib/Target/R600/SIFixSGPRCopies.cpp
@@ -187,7 +187,7 @@ bool SIFixSGPRCopies::isVGPRToSGPRCopy(const MachineInstr &Copy,
       DstRC == &AMDGPU::M0RegRegClass)
     return false;
 
-  SrcRC = inferRegClassFromDef(TRI, MRI, SrcReg, SrcSubReg);
+  SrcRC = TRI->getSubRegClass(MRI.getRegClass(SrcReg), SrcSubReg);
   return TRI->isSGPRClass(DstRC) && TRI->hasVGPRs(SrcRC);
 }