Fix incorrect redundant expression in target AMDGPU.

Summary:
The expression is detected as a redundant expression.
Turn out, this is probably a bug.

```
/home/etienneb/llvm/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp:306:26: warning: both side of operator are equivalent [misc-redundant-expression]
  if (isSMRD(*FirstLdSt) && isSMRD(*FirstLdSt)) {
```

Reviewers: rnk, tstellarAMD

Subscribers: arsenm, cfe-commits

Differential Revision: http://reviews.llvm.org/D19460

llvm-svn: 267415

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp b/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
index 2520291db78..ed98b27396b 100644
--- a/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
@@ -303,7 +303,7 @@ bool SIInstrInfo::shouldClusterMemOps(MachineInstr *FirstLdSt,
     SecondDst = getNamedOperand(*SecondLdSt, AMDGPU::OpName::vdst);
   }
 
-  if (isSMRD(*FirstLdSt) && isSMRD(*FirstLdSt)) {
+  if (isSMRD(*FirstLdSt) && isSMRD(*SecondLdSt)) {
     FirstDst = getNamedOperand(*FirstLdSt, AMDGPU::OpName::sdst);
     SecondDst = getNamedOperand(*SecondLdSt, AMDGPU::OpName::sdst);
   }