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

[Tom Stellard]

From: Tom Stellard <thomas.stellard at amd.com>

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.
---
 lib/Target/R600/SIFixSGPRCopies.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Target/R600/SIFixSGPRCopies.cpp b/lib/Target/R600/SIFixSGPRCopies.cpp
index 3370c79..f0065ea 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);
 }
 
-- 
1.8.1.5