forked from OSchip/llvm-project
48 lines
1.6 KiB
LLVM
48 lines
1.6 KiB
LLVM
; RUN: opt < %s -mem2reg -instcombine -S | grep store
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; PR590
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define void @zero(i8* %p, i32 %n) {
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entry:
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%p_addr = alloca i8* ; <i8**> [#uses=2]
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%n_addr = alloca i32 ; <i32*> [#uses=2]
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%i = alloca i32 ; <i32*> [#uses=6]
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%out = alloca i32 ; <i32*> [#uses=2]
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%undef = alloca i32 ; <i32*> [#uses=2]
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store i8* %p, i8** %p_addr
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store i32 %n, i32* %n_addr
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store i32 0, i32* %i
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br label %loopentry
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loopentry: ; preds = %endif, %entry
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%tmp.0 = load i32, i32* %n_addr ; <i32> [#uses=1]
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%tmp.1 = add i32 %tmp.0, 1 ; <i32> [#uses=1]
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%tmp.2 = load i32, i32* %i ; <i32> [#uses=1]
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%tmp.3 = icmp sgt i32 %tmp.1, %tmp.2 ; <i1> [#uses=2]
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%tmp.4 = zext i1 %tmp.3 to i32 ; <i32> [#uses=0]
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br i1 %tmp.3, label %no_exit, label %return
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no_exit: ; preds = %loopentry
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%tmp.5 = load i32, i32* %undef ; <i32> [#uses=1]
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store i32 %tmp.5, i32* %out
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store i32 0, i32* %undef
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%tmp.6 = load i32, i32* %i ; <i32> [#uses=1]
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%tmp.7 = icmp sgt i32 %tmp.6, 0 ; <i1> [#uses=2]
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%tmp.8 = zext i1 %tmp.7 to i32 ; <i32> [#uses=0]
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br i1 %tmp.7, label %then, label %endif
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then: ; preds = %no_exit
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%tmp.9 = load i8*, i8** %p_addr ; <i8*> [#uses=1]
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%tmp.10 = load i32, i32* %i ; <i32> [#uses=1]
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%tmp.11 = sub i32 %tmp.10, 1 ; <i32> [#uses=1]
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%tmp.12 = getelementptr i8, i8* %tmp.9, i32 %tmp.11 ; <i8*> [#uses=1]
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%tmp.13 = load i32, i32* %out ; <i32> [#uses=1]
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%tmp.14 = trunc i32 %tmp.13 to i8 ; <i8> [#uses=1]
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store i8 %tmp.14, i8* %tmp.12
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br label %endif
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endif: ; preds = %then, %no_exit
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%tmp.15 = load i32, i32* %i ; <i32> [#uses=1]
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%inc = add i32 %tmp.15, 1 ; <i32> [#uses=1]
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store i32 %inc, i32* %i
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br label %loopentry
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return: ; preds = %loopentry
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ret void
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}
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