AMDGPU: Handle flat in getMemOpBaseRegImmOfs

It can still report the base register, and the uses give up when it
fails.

llvm-svn: 271575

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp b/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
index 17c212f15c0..5d0f828af30 100644
--- a/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
@@ -287,6 +287,13 @@ bool SIInstrInfo::getMemOpBaseRegImmOfs(MachineInstr *LdSt, unsigned &BaseReg,
     return true;
   }
 
+  if (isFLAT(*LdSt)) {
+    const MachineOperand *AddrReg = getNamedOperand(*LdSt, AMDGPU::OpName::addr);
+    BaseReg = AddrReg->getReg();
+    Offset = 0;
+    return true;
+  }
+
   return false;
 }