39 lines
1.1 KiB
LLVM
39 lines
1.1 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -passes=jump-threading < %s | FileCheck %s
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; PR9112
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; This is actually a test for value tracking. Jump threading produces
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; "%phi = phi i16" when it removes all edges leading to %unreachable.
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; The .ll parser won't let us write that directly since it's invalid code.
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define void @func() nounwind {
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; CHECK-LABEL: @func(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[BB:%.*]]
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; CHECK: bb:
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; CHECK-NEXT: br label [[BB]]
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; CHECK: unreachable:
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; CHECK-NEXT: [[PHI:%.*]] = phi i16 [ [[ADD:%.*]], [[UNREACHABLE:%.*]] ], [ 0, [[NEXT:%.*]] ]
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; CHECK-NEXT: [[ADD]] = add i16 0, [[PHI]]
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt i16 [[PHI]], 0
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; CHECK-NEXT: br i1 [[CMP]], label [[UNREACHABLE]], label [[NEXT]]
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; CHECK: next:
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; CHECK-NEXT: br label [[UNREACHABLE]]
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;
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entry:
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br label %bb
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bb:
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br label %bb
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unreachable:
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%phi = phi i16 [ %add, %unreachable ], [ 0, %next ]
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%add = add i16 0, %phi
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%cmp = icmp slt i16 %phi, 0
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br i1 %cmp, label %unreachable, label %next
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next:
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br label %unreachable
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}
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