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645fd68c5c
ReplaceInstUsesWith needs to return nullptr when the input has no users, because in that case it does not mutate the program. Otherwise, we can get stuck in an infinite loop of repeatedly attempting to constant fold and instruction with no users. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231755 91177308-0d34-0410-b5e6-96231b3b80d8
15 lines
420 B
LLVM
15 lines
420 B
LLVM
; RUN: opt -instcombine < %s
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; Function Attrs: nounwind readnone ssp
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define void @mulByZero(<4 x i16> %x) #0 {
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entry:
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%a = tail call <4 x i32> @llvm.arm.neon.vmulls.v4i32(<4 x i16> %x, <4 x i16> zeroinitializer) #2
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ret void
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}
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; Function Attrs: nounwind readnone
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declare <4 x i32> @llvm.arm.neon.vmulls.v4i32(<4 x i16>, <4 x i16>) #1
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attributes #0 = { nounwind readnone ssp }
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attributes #1 = { nounwind readnone }
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