[ARM64] Never hoist the shift value of a shift instruction.
There is no need to check if we want to hoist the immediate value of an
shift instruction. Simply return TCC_Free right away.
llvm-svn: 206101
diff --git a/llvm/lib/Target/ARM64/ARM64TargetTransformInfo.cpp b/llvm/lib/Target/ARM64/ARM64TargetTransformInfo.cpp
index cc8cc80..372900e 100644
--- a/llvm/lib/Target/ARM64/ARM64TargetTransformInfo.cpp
+++ b/llvm/lib/Target/ARM64/ARM64TargetTransformInfo.cpp
@@ -203,15 +203,19 @@
case Instruction::SDiv:
case Instruction::URem:
case Instruction::SRem:
- case Instruction::Shl:
- case Instruction::LShr:
- case Instruction::AShr:
case Instruction::And:
case Instruction::Or:
case Instruction::Xor:
case Instruction::ICmp:
ImmIdx = 1;
break;
+ // Always return TCC_Free for the shift value of a shift instruction.
+ case Instruction::Shl:
+ case Instruction::LShr:
+ case Instruction::AShr:
+ if (Idx == 1)
+ return TCC_Free;
+ break;
case Instruction::Trunc:
case Instruction::ZExt:
case Instruction::SExt: