derek.holloway
7502bf64a4
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124 lines
2.2 KiB
LLVM
124 lines
2.2 KiB
LLVM
; RUN: opt %s -S -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 | FileCheck %s
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; cmp1 implies cmp2 is false
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; CHECK-LABEL: @test1
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; CHECK-NOT: call void @is(i1 true)
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; CHECK: call void @is(i1 false)
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define void @test1(i32 %a) {
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%cmp1 = icmp eq i32 %a, 0
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br i1 %cmp1, label %taken, label %untaken
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taken:
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%cmp2 = icmp eq i32 %a, 1
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br i1 %cmp2, label %istrue, label %isfalse
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istrue:
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call void @is(i1 true)
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ret void
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isfalse:
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call void @is(i1 false)
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ret void
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untaken:
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ret void
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}
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; cmp1 implies cmp2 is false
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; CHECK-LABEL: @test2
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; CHECK-NOT: call void @is(i1 true)
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; CHECK: call void @is(i1 false)
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define void @test2(i32 %a) {
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%cmp1 = icmp ugt i32 %a, 5
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br i1 %cmp1, label %untaken, label %taken
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taken:
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%cmp2 = icmp ugt i32 %a, 6
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br i1 %cmp2, label %istrue, label %isfalse
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istrue:
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call void @is(i1 true)
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ret void
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isfalse:
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call void @is(i1 false)
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ret void
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untaken:
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ret void
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}
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; cmp1 implies cmp2 is false
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; CHECK-LABEL: @test3
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; CHECK-NOT: call void @is(i1 true)
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; CHECK: call void @is(i1 false)
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define void @test3(i32 %a) {
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%cmp1 = icmp ugt i32 %a, 1
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br i1 %cmp1, label %taken, label %untaken
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taken:
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%cmp2 = icmp eq i32 %a, 0
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br i1 %cmp2, label %istrue, label %isfalse
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istrue:
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call void @is(i1 true)
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ret void
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isfalse:
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call void @is(i1 false)
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ret void
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untaken:
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ret void
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}
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; cmp1 implies cmp2 is true
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; CHECK-LABEL: @test4
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; CHECK: call void @is(i1 true)
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; CHECK-NOT: call void @is(i1 false)
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define void @test4(i32 %a) {
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%cmp1 = icmp sgt i32 %a, 1
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br i1 %cmp1, label %taken, label %untaken
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taken:
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%cmp2 = icmp ugt i32 %a, 0
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br i1 %cmp2, label %istrue, label %isfalse
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istrue:
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call void @is(i1 true)
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ret void
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isfalse:
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call void @is(i1 false)
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ret void
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untaken:
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ret void
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}
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; cmp1 implies cmp2 is true
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; CHECK-LABEL: @test5
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; CHECK: call void @is(i1 true)
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; CHECK-NOT: call void @is(i1 false)
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define void @test5(i32 %a) {
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%cmp1 = icmp sgt i32 %a, 5
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br i1 %cmp1, label %taken, label %untaken
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taken:
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%cmp2 = icmp sgt i32 %a, -1
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br i1 %cmp2, label %istrue, label %isfalse
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istrue:
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call void @is(i1 true)
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ret void
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isfalse:
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call void @is(i1 false)
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ret void
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untaken:
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ret void
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}
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declare void @is(i1)
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