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5bce67a95f
DAGCombiner was counting all uses of a load node when considering whether it's worth combining into a zextload. Really, it wants to ignore the chain and just count real uses. rdar://problem/13896307 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185419 91177308-0d34-0410-b5e6-96231b3b80d8
17 lines
448 B
LLVM
17 lines
448 B
LLVM
; RUN: llc -mtriple=x86_64-apple-darwin < %s| FileCheck %s
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; A bug in DAGCombiner prevented it forming a zextload in this simple case
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; because it counted both the chain user and the real user against the
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; profitability total.
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define void @load_zext(i32* nocapture %p){
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entry:
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%0 = load i32* %p, align 4
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%and = and i32 %0, 255
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tail call void @use(i32 %and)
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ret void
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; CHECK: movzbl ({{%r[a-z]+}}), {{%e[a-z]+}}
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}
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declare void @use(i32)
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