35 lines
1.4 KiB
LLVM
35 lines
1.4 KiB
LLVM
; RUN: opt < %s -instcombine -S | \
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; RUN: grep select | not grep {i32\\*}
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; This testcase corresponds to PR362, which notices that this horrible code
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; is generated by the C++ front-end and LLVM optimizers, which has lots of
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; loads and other stuff that are unneeded.
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;
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; Instcombine should propagate the load through the select instructions to
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; allow elimination of the extra stuff by the mem2reg pass.
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define void @_Z5test1RiS_(i32* %x, i32* %y) {
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entry:
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%tmp.1.i = load i32* %y ; <i32> [#uses=1]
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%tmp.3.i = load i32* %x ; <i32> [#uses=1]
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%tmp.4.i = icmp slt i32 %tmp.1.i, %tmp.3.i ; <i1> [#uses=1]
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%retval.i = select i1 %tmp.4.i, i32* %y, i32* %x ; <i32*> [#uses=1]
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%tmp.4 = load i32* %retval.i ; <i32> [#uses=1]
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store i32 %tmp.4, i32* %x
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ret void
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}
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define void @_Z5test2RiS_(i32* %x, i32* %y) {
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entry:
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%tmp.0 = alloca i32 ; <i32*> [#uses=2]
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%tmp.2 = load i32* %x ; <i32> [#uses=2]
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store i32 %tmp.2, i32* %tmp.0
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%tmp.3.i = load i32* %y ; <i32> [#uses=1]
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%tmp.4.i = icmp slt i32 %tmp.2, %tmp.3.i ; <i1> [#uses=1]
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%retval.i = select i1 %tmp.4.i, i32* %y, i32* %tmp.0 ; <i32*> [#uses=1]
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%tmp.6 = load i32* %retval.i ; <i32> [#uses=1]
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store i32 %tmp.6, i32* %y
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ret void
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}
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