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Imported Upstream version 5.18.0.167
Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a
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; RUN: opt < %s -S -ipsccp | FileCheck %s
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; PR5596
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; IPSCCP should propagate the 0 argument, eliminate the switch, and propagate
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; the result.
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; CHECK: define i32 @main() #0 {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: %call2 = tail call i32 @wwrite(i64 0) [[NUW:#[0-9]+]]
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; CHECK-NEXT: ret i32 123
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define i32 @main() noreturn nounwind {
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entry:
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%call2 = tail call i32 @wwrite(i64 0) nounwind
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ret i32 %call2
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}
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define internal i32 @wwrite(i64 %i) nounwind readnone {
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entry:
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switch i64 %i, label %sw.default [
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i64 3, label %return
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i64 10, label %return
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]
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sw.default:
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ret i32 123
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return:
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ret i32 0
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}
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; CHECK: attributes #0 = { noreturn nounwind }
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; CHECK: attributes #1 = { nounwind readnone }
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; CHECK: attributes [[NUW]] = { nounwind }
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