derek.holloway
7502bf64a4
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37 lines
1.3 KiB
LLVM
37 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --check-globals all --version 5
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; Test merging of blocks that only have PHI nodes in them
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;
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; RUN: opt < %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s
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;
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define i32 @test(i1 %a, i1 %b) {
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; CHECK-LABEL: define i32 @test(
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; CHECK-SAME: i1 [[A:%.*]], i1 [[B:%.*]]) {
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; CHECK-NEXT: [[M:.*:]]
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; CHECK-NEXT: [[SPEC_SELECT:%.*]] = select i1 [[B]], i32 0, i32 1, !prof [[PROF0:![0-9]+]]
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; CHECK-NEXT: [[W:%.*]] = select i1 [[A]], i32 2, i32 [[SPEC_SELECT]], !prof [[PROF1:![0-9]+]]
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; CHECK-NEXT: [[R:%.*]] = add i32 [[W]], 1
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; CHECK-NEXT: ret i32 [[R]]
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;
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br i1 %a, label %M, label %O, !prof !0
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O: ; preds = %0
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br i1 %b, label %N, label %Q, !prof !1
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Q: ; preds = %O
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br label %N
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N: ; preds = %Q, %O
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; This block should be foldable into M
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%Wp = phi i32 [ 0, %O ], [ 1, %Q ] ; <i32> [#uses=1]
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br label %M
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M: ; preds = %N, %0
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%W = phi i32 [ %Wp, %N ], [ 2, %0 ] ; <i32> [#uses=1]
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%R = add i32 %W, 1 ; <i32> [#uses=1]
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ret i32 %R
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}
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!0 = !{!"branch_weights", i32 11, i32 7}
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!1 = !{!"branch_weights", i32 3, i32 5}
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;.
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; CHECK: [[PROF0]] = !{!"branch_weights", i32 3, i32 5}
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; CHECK: [[PROF1]] = !{!"branch_weights", i32 11, i32 7}
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;.
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