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2cd454f768
Use LVI to prove that adds do not wrap. The change is motivated by https://llvm.org/bugs/show_bug.cgi?id=28620 bug and it's the first step to fix that problem. Reviewed By: sanjoy Differential Revision: http://reviews.llvm.org/D23059 llvm-svn: 277592
92 lines
1.4 KiB
LLVM
92 lines
1.4 KiB
LLVM
; RUN: opt < %s -correlated-propagation -S | FileCheck %s
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; CHECK-LABEL: @test0(
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define void @test0(i32 %a) {
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entry:
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%cmp = icmp slt i32 %a, 100
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br i1 %cmp, label %bb, label %exit
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bb:
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; CHECK: %add = add nsw i32 %a, 1
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%add = add i32 %a, 1
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br label %exit
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exit:
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ret void
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}
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; CHECK-LABEL: @test1(
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define void @test1(i32 %a) {
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entry:
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%cmp = icmp ult i32 %a, 100
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br i1 %cmp, label %bb, label %exit
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bb:
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; CHECK: %add = add nuw nsw i32 %a, 1
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%add = add i32 %a, 1
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br label %exit
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exit:
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ret void
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}
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; CHECK-LABEL: @test2(
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define void @test2(i32 %a) {
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entry:
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%cmp = icmp ult i32 %a, -1
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br i1 %cmp, label %bb, label %exit
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bb:
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; CHECK: %add = add nuw i32 %a, 1
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%add = add i32 %a, 1
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br label %exit
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exit:
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ret void
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}
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; CHECK-LABEL: @test3(
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define void @test3(i32 %a) {
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entry:
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%cmp = icmp ule i32 %a, -1
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br i1 %cmp, label %bb, label %exit
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bb:
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; CHECK: %add = add i32 %a, 1
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%add = add i32 %a, 1
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br label %exit
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exit:
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ret void
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}
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; CHECK-LABEL: @test4(
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define void @test4(i32 %a) {
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entry:
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%cmp = icmp slt i32 %a, 2147483647
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br i1 %cmp, label %bb, label %exit
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bb:
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; CHECK: %add = add nsw i32 %a, 1
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%add = add i32 %a, 1
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br label %exit
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exit:
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ret void
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}
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; CHECK-LABEL: @test5(
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define void @test5(i32 %a) {
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entry:
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%cmp = icmp sle i32 %a, 2147483647
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br i1 %cmp, label %bb, label %exit
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bb:
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; CHECK: %add = add i32 %a, 1
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%add = add i32 %a, 1
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br label %exit
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exit:
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ret void
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}
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