AMDGPU/SI: Move some ISel helpers into utils so they can be shared with GISel

Reviewers: arsenm

Reviewed By: arsenm

Subscribers: kzhuravl, wdng, nhaehnle, yaxunl, llvm-commits, tony-tye

Differential Revision: https://reviews.llvm.org/D29068

llvm-svn: 293321

1 files changed, 29 insertions, 0 deletions

diff --git a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
index 821f4e29ac7..e4eaaba9ec9 100644
--- a/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
@@ -9,7 +9,9 @@
 #include "AMDGPUBaseInfo.h"
 #include "AMDGPU.h"
 #include "SIDefines.h"
+#include "llvm/CodeGen/MachineMemOperand.h"
 #include "llvm/IR/LLVMContext.h"
+#include "llvm/IR/Constants.h"
 #include "llvm/IR/Function.h"
 #include "llvm/IR/GlobalValue.h"
 #include "llvm/MC/MCContext.h"
@@ -463,5 +465,32 @@ bool isInlinableLiteral16(int16_t Literal, bool HasInv2Pi) {
          Val == 0x3118;   // 1/2pi
 }
 
+bool isUniformMMO(const MachineMemOperand *MMO) {
+  const Value *Ptr = MMO->getValue();
+  // UndefValue means this is a load of a kernel input.  These are uniform.
+  // Sometimes LDS instructions have constant pointers.
+  // If Ptr is null, then that means this mem operand contains a
+  // PseudoSourceValue like GOT.
+  if (!Ptr || isa<UndefValue>(Ptr) || isa<Argument>(Ptr) ||
+      isa<Constant>(Ptr) || isa<GlobalValue>(Ptr))
+    return true;
+
+  const Instruction *I = dyn_cast<Instruction>(Ptr);
+  return I && I->getMetadata("amdgpu.uniform");
+}
+
+int64_t getSMRDEncodedOffset(const MCSubtargetInfo &ST, int64_t ByteOffset) {
+  if (isSI(ST) || isCI(ST))
+    return ByteOffset >> 2;
+
+  return ByteOffset;
+}
+
+bool isLegalSMRDImmOffset(const MCSubtargetInfo &ST, int64_t ByteOffset) {
+  int64_t EncodedOffset = getSMRDEncodedOffset(ST, ByteOffset);
+  return isSI(ST) || isCI(ST) ? isUInt<8>(EncodedOffset) :
+                                isUInt<20>(EncodedOffset);
+}
+
 } // End namespace AMDGPU
 } // End namespace llvm