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