79 lines
2.8 KiB
LLVM
79 lines
2.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -passes=loop-fusion < %s 2>&1 | FileCheck %s
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; Tests when the second loop preheader has a phi coming from the first loop
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; exit. If the phi is not used in the second loop, the loops can be fused and
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; the phi is sunk to the fused loop exit. If the phi is used in the second loop,
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; the loops cannot be fused.
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define void @test1() {
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; CHECK-LABEL: @test1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[VECTOR_PH:%.*]]
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; CHECK: vector.ph:
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; CHECK-NEXT: br label [[MIDDLE_BLOCK:%.*]]
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; CHECK: middle.block:
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; CHECK-NEXT: br i1 true, label [[FOR_END41:%.*]], label [[VECTOR_PH]]
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; CHECK: for.end41:
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; CHECK-NEXT: [[DOTLCSSA92:%.*]] = phi i16 [ 1, [[MIDDLE_BLOCK]] ]
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; CHECK-NEXT: ret void
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;
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entry:
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br label %vector.ph
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vector.ph: ; preds = %middle.block, %entry
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br label %middle.block
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middle.block: ; preds = %vector.ph
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br i1 true, label %for.cond17.preheader, label %vector.ph
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for.cond17.preheader: ; preds = %middle.block
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%.lcssa92 = phi i16 [ 1, %middle.block ]
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br label %vector.ph61
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vector.ph61: ; preds = %middle.block59, %for.cond17.preheader
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br i1 true, label %for.end41, label %vector.ph61
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for.end41: ; preds = %middle.block59
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ret void
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}
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define void @test2() {
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; CHECK-LABEL: @test2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br label [[VECTOR_PH:%.*]]
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; CHECK: vector.ph:
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; CHECK-NEXT: br label [[MIDDLE_BLOCK:%.*]]
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; CHECK: middle.block:
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; CHECK-NEXT: br i1 true, label [[FOR_COND17_PREHEADER:%.*]], label [[VECTOR_PH]]
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; CHECK: for.cond17.preheader:
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; CHECK-NEXT: [[DOTLCSSA92:%.*]] = phi i16 [ 1, [[MIDDLE_BLOCK]] ]
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; CHECK-NEXT: br label [[VECTOR_PH61:%.*]]
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; CHECK: vector.ph61:
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; CHECK-NEXT: call void @a(i16 [[DOTLCSSA92]])
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; CHECK-NEXT: br i1 true, label [[FOR_END41:%.*]], label [[VECTOR_PH61]]
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; CHECK: for.end41:
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; CHECK-NEXT: ret void
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;
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entry:
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br label %vector.ph
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vector.ph: ; preds = %middle.block, %entry
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br label %middle.block
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middle.block: ; preds = %vector.ph
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br i1 true, label %for.cond17.preheader, label %vector.ph
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for.cond17.preheader: ; preds = %middle.block
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%.lcssa92 = phi i16 [ 1, %middle.block ]
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br label %vector.ph61
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vector.ph61: ; preds = %middle.block59, %for.cond17.preheader
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call void @a(i16 %.lcssa92)
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br i1 true, label %for.end41, label %vector.ph61
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for.end41: ; preds = %middle.block59
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ret void
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}
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declare void @a(i16);
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