derek.holloway
7502bf64a4
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178 lines
3.6 KiB
LLVM
178 lines
3.6 KiB
LLVM
; RUN: opt -passes=jump-threading -S < %s | FileCheck %s
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declare void @side_effect(i32)
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define void @test0(i32 %i, i32 %len) {
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; CHECK-LABEL: @test0(
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entry:
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call void @side_effect(i32 0)
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%i.inc = add nuw i32 %i, 1
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%c0 = icmp ult i32 %i.inc, %len
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br i1 %c0, label %left, label %right
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left:
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; CHECK: entry:
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; CHECK: br i1 %c0, label %left0, label %right
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; CHECK: left0:
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; CHECK: call void @side_effect
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; CHECK-NOT: br i1 %c1
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; CHECK: call void @side_effect
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call void @side_effect(i32 0)
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%c1 = icmp ult i32 %i, %len
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br i1 %c1, label %left0, label %right
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left0:
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call void @side_effect(i32 0)
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ret void
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right:
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%t = phi i32 [ 1, %left ], [ 2, %entry ]
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call void @side_effect(i32 %t)
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ret void
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}
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define void @test1(i32 %i, i32 %len) {
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; CHECK-LABEL: @test1(
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entry:
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call void @side_effect(i32 0)
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%i.inc = add nsw i32 %i, 1
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%c0 = icmp slt i32 %i.inc, %len
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br i1 %c0, label %left, label %right
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left:
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; CHECK: entry:
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; CHECK: br i1 %c0, label %left0, label %right
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; CHECK: left0:
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; CHECK: call void @side_effect
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; CHECK-NOT: br i1 %c1
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; CHECK: call void @side_effect
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call void @side_effect(i32 0)
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%c1 = icmp slt i32 %i, %len
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br i1 %c1, label %left0, label %right
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left0:
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call void @side_effect(i32 0)
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ret void
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right:
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%t = phi i32 [ 1, %left ], [ 2, %entry ]
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call void @side_effect(i32 %t)
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ret void
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}
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define void @test2(i32 %i, i32 %len, ptr %c.ptr) {
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; CHECK-LABEL: @test2(
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; CHECK: entry:
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; CHECK: br i1 %c0, label %cont, label %right
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; CHECK: cont:
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; CHECK: br i1 %c, label %left0, label %right
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; CHECK: left0:
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; CHECK: call void @side_effect(i32 0)
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; CHECK: call void @side_effect(i32 0)
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entry:
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call void @side_effect(i32 0)
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%i.inc = add nsw i32 %i, 1
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%c0 = icmp slt i32 %i.inc, %len
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br i1 %c0, label %cont, label %right
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cont:
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%c = load i1, ptr %c.ptr
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br i1 %c, label %left, label %right
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left:
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call void @side_effect(i32 0)
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%c1 = icmp slt i32 %i, %len
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br i1 %c1, label %left0, label %right
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left0:
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call void @side_effect(i32 0)
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ret void
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right:
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%t = phi i32 [ 1, %left ], [ 2, %entry ], [ 3, %cont ]
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call void @side_effect(i32 %t)
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ret void
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}
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; A s<= B implies A s> B is false.
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; CHECK-LABEL: @test3(
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; CHECK: entry:
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; CHECK: br i1 %cmp, label %if.end, label %if.end3
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; CHECK-NOT: br i1 %cmp1, label %if.then2, label %if.end
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; CHECK-NOT: call void @side_effect(i32 0)
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; CHECK: br label %if.end3
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; CHECK: ret void
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define void @test3(i32 %a, i32 %b) {
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entry:
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%cmp = icmp sle i32 %a, %b
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br i1 %cmp, label %if.then, label %if.end3
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if.then:
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%cmp1 = icmp sgt i32 %a, %b
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br i1 %cmp1, label %if.then2, label %if.end
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if.then2:
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call void @side_effect(i32 0)
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br label %if.end
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if.end:
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br label %if.end3
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if.end3:
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ret void
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}
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declare void @is(i1)
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; If A >=s B is false then A <=s B is implied true.
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; CHECK-LABEL: @test_sge_sle
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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 @test_sge_sle(i32 %a, i32 %b) {
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%cmp1 = icmp sge i32 %a, %b
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br i1 %cmp1, label %untaken, label %taken
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taken:
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%cmp2 = icmp sle i32 %a, %b
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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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; If A <=s B is false then A <=s B is implied false.
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; CHECK-LABEL: @test_sle_sle
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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 @test_sle_sle(i32 %a, i32 %b) {
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%cmp1 = icmp sle i32 %a, %b
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br i1 %cmp1, label %untaken, label %taken
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taken:
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%cmp2 = icmp sle i32 %a, %b
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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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