derek.holloway
7502bf64a4
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62 lines
1.7 KiB
LLVM
62 lines
1.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
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; RUN: opt -passes=gvn -S -o - %s | FileCheck %s
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; If a branch has two identical successors, we cannot declare either dead.
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define void @widget(i1 %p) {
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; CHECK-LABEL: define void @widget(
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; CHECK-SAME: i1 [[P:%.*]]) {
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; CHECK-NEXT: [[ENTRY:.*]]:
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; CHECK-NEXT: br label %[[BB2:.*]]
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; CHECK: [[BB2]]:
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; CHECK-NEXT: [[T1:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[T2:%.*]], %[[BB7:.*]] ]
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; CHECK-NEXT: [[T2]] = add i64 [[T1]], 1
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; CHECK-NEXT: [[T3:%.*]] = icmp ult i64 0, [[T2]]
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; CHECK-NEXT: br i1 [[T3]], label %[[BB3:.*]], label %[[BB4:.*]]
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; CHECK: [[BB3]]:
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; CHECK-NEXT: [[T4:%.*]] = call i64 @f()
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; CHECK-NEXT: br label %[[BB4]]
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; CHECK: [[BB4]]:
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; CHECK-NEXT: [[FOO:%.*]] = phi i64 [ [[T4]], %[[BB3]] ], [ 0, %[[BB2]] ]
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; CHECK-NEXT: br i1 [[P]], label %[[BB5:.*]], label %[[BB6:.*]]
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; CHECK: [[BB5]]:
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; CHECK-NEXT: br i1 true, label %[[BB7]], label %[[BB7]]
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; CHECK: [[BB6]]:
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; CHECK-NEXT: br i1 true, label %[[BB7]], label %[[BB7]]
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; CHECK: [[BB7]]:
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; CHECK-NEXT: br i1 [[P]], label %[[BB2]], label %[[BB8:.*]]
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; CHECK: [[BB8]]:
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; CHECK-NEXT: ret void
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;
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entry:
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br label %bb2
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bb2:
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%t1 = phi i64 [ 0, %entry ], [ %t5, %bb7 ]
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%t2 = add i64 %t1, 1
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%t3 = icmp ult i64 0, %t2
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br i1 %t3, label %bb3, label %bb4
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bb3:
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%t4 = call i64 @f()
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br label %bb4
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bb4:
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%foo = phi i64 [ %t4, %bb3 ], [ 0, %bb2 ]
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br i1 %p, label %bb5, label %bb6
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bb5:
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br i1 true, label %bb7, label %bb7
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bb6:
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br i1 true, label %bb7, label %bb7
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bb7:
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%t5 = add i64 %t1, 1
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br i1 %p, label %bb2, label %bb8
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bb8:
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ret void
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}
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declare i64 @f()
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