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