AMDGPU: Fix not checking for copy when looking at copy src

Effectively reverts r356956. The check for isFullCopy was excessive,
but there still needs to be a check that this is a copy.

llvm-svn: 358890

1 files changed, 6 insertions, 1 deletions

diff --git a/llvm/lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp b/llvm/lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp
index 7e843e83780..c8a146741ec 100644
--- a/llvm/lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp
+++ b/llvm/lib/Target/AMDGPU/SIOptimizeExecMaskingPreRA.cpp
@@ -88,7 +88,12 @@ static bool isEndCF(const MachineInstr& MI, const SIRegisterInfo* TRI) {
 }
 
 static bool isFullExecCopy(const MachineInstr& MI) {
-  return MI.getOperand(1).getReg() == AMDGPU::EXEC;
+  if (MI.isCopy() && MI.getOperand(1).getReg() == AMDGPU::EXEC) {
+    assert(MI.isFullCopy());
+    return true;
+  }
+
+  return false;
 }
 
 static unsigned getOrNonExecReg(const MachineInstr &MI,