[llvm] 4f71252 - [TTI] Let getOperationCost assume that Freeze is free
Juneyoung Lee via llvm-commits
llvm-commits at lists.llvm.org
Wed Feb 26 09:56:19 PST 2020
Author: Juneyoung Lee
Date: 2020-02-27T02:56:11+09:00
New Revision: 4f71252cf8430e60837e0e030c3d40db4c79eb99
URL: https://github.com/llvm/llvm-project/commit/4f71252cf8430e60837e0e030c3d40db4c79eb99
DIFF: https://github.com/llvm/llvm-project/commit/4f71252cf8430e60837e0e030c3d40db4c79eb99.diff
LOG: [TTI] Let getOperationCost assume that Freeze is free
Added:
Modified:
llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
Removed:
################################################################################
diff --git a/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h b/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
index 09bd13aea26a..5c51d30384b7 100644
--- a/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
+++ b/llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
@@ -62,6 +62,11 @@ class TargetTransformInfoImplBase {
// Otherwise, the default basic cost is used.
return TTI::TCC_Basic;
+ case Instruction::Freeze:
+ // Freeze operation is free because it should be lowered into a register
+ // use without any register copy in assembly code.
+ return TTI::TCC_Free;
+
case Instruction::FDiv:
case Instruction::FRem:
case Instruction::SDiv:
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