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[InstCombine] Use IRBuilder to create bitcast 

This makes sure that the constant expression bitcast goes through
target-dependent constant folding, and thus avoids an additional
iteration of InstCombine.
This commit is contained in:
Nikita Popov 2020-02-28 22:29:54 +01:00
parent 17be8e4a6f
commit 9b5de84e27
2 changed files with 2 additions and 2 deletions
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2
llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
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@ -2151,7 +2151,7 @@ static Instruction *foldBitCastBitwiseLogic(BitCastInst &BitCast,
if (match(BO->getOperand(1), m_Constant(C))) {
// bitcast (logic X, C) --> logic (bitcast X, C')
Value *CastedOp0 = Builder.CreateBitCast(BO->getOperand(0), DestTy);
Value *CastedC = ConstantExpr::getBitCast(C, DestTy);
Value *CastedC = Builder.CreateBitCast(C, DestTy);
return BinaryOperator::Create(BO->getOpcode(), CastedOp0, CastedC);
}

2
llvm/test/Transforms/InstCombine/icmp-xor-signbit.ll
View File

@ -1,5 +1,5 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
; RUN: opt < %s -instcombine -instcombine-infinite-loop-threshold=2 -S | FileCheck %s
; icmp u/s (a ^ signmask), (b ^ signmask) --> icmp s/u a, b