53 lines
2.2 KiB
LLVM
53 lines
2.2 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instcombine -S | FileCheck %s
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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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; CHECK-LABEL: @_Z5test1RiS_(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP_1_I:%.*]] = load i32, i32* [[Y:%.*]], align 4
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; CHECK-NEXT: [[TMP_3_I:%.*]] = load i32, i32* [[X:%.*]], align 4
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; CHECK-NEXT: [[TMP_4_I:%.*]] = icmp slt i32 [[TMP_1_I]], [[TMP_3_I]]
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; CHECK-NEXT: [[TMP_4:%.*]] = select i1 [[TMP_4_I]], i32 [[TMP_1_I]], i32 [[TMP_3_I]]
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; CHECK-NEXT: store i32 [[TMP_4]], i32* [[X]], align 4
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; CHECK-NEXT: ret void
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;
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entry:
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%tmp.1.i = load i32, i32* %y ; <i32> [#uses=1]
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%tmp.3.i = load i32, 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, 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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; CHECK-LABEL: @_Z5test2RiS_(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[TMP_2:%.*]] = load i32, i32* [[X:%.*]], align 4
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; CHECK-NEXT: [[TMP_3_I:%.*]] = load i32, i32* [[Y:%.*]], align 4
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; CHECK-NEXT: [[TMP_4_I:%.*]] = icmp slt i32 [[TMP_2]], [[TMP_3_I]]
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; CHECK-NEXT: [[TMP_6:%.*]] = select i1 [[TMP_4_I]], i32 [[TMP_3_I]], i32 [[TMP_2]]
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; CHECK-NEXT: store i32 [[TMP_6]], i32* [[Y]], align 4
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; CHECK-NEXT: ret void
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;
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entry:
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%tmp.0 = alloca i32 ; <i32*> [#uses=2]
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%tmp.2 = load i32, 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, 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, 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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