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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -simple-loop-unswitch -loop-reduce -loop-simplifycfg -verify-memoryssa -S %s | FileCheck %s
; TODO: also run with NPM, but currently LSR does not preserve LCSSA, causing a verification failure on the test.
; opt -passes='loop-mssa(simple-loop-unswitch<nontrivial>,loop-reduce,simplifycfg)' -verify-memoryssa -S %s | FileCheck %s
; Test case for PR47557.
; REQUIRES: x86-registered-target
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@a = external global i32, align 4
@c = external global [1 x i32], align 4
define ptr @test() {
; CHECK-LABEL: @test(
; CHECK-NEXT: entry:
; CHECK-NEXT: switch i32 0, label [[ENTRY_SPLIT:%.*]] [
; CHECK-NEXT: i32 1, label [[FOR_BODY3SPLIT:%.*]]
; CHECK-NEXT: i32 2, label [[FOR_COND2_2_FOR_BODY3_CRIT_EDGE:%.*]]
; CHECK-NEXT: ]
; CHECK: entry.split:
; CHECK-NEXT: br label [[FOR_COND:%.*]]
; CHECK: for.cond:
; CHECK-NEXT: [[STOREMERGE:%.*]] = phi i64 [ 0, [[ENTRY_SPLIT]] ], [ [[INC7:%.*]], [[FOR_COND]] ]
; CHECK-NEXT: [[INC7]] = add nsw i64 [[STOREMERGE]], 1
; CHECK-NEXT: br label [[FOR_COND]]
; CHECK: for.body3split:
; CHECK-NEXT: br label [[FOR_BODY3:%.*]]
; CHECK: for.cond2.2.for.body3_crit_edge:
; CHECK-NEXT: br label [[FOR_BODY3]]
; CHECK: for.body3:
; CHECK-NEXT: [[STOREMERGE_LCSSA:%.*]] = phi i64 [ poison, [[FOR_COND2_2_FOR_BODY3_CRIT_EDGE]] ], [ poison, [[FOR_BODY3SPLIT]] ]
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [1 x i32], ptr @c, i64 0, i64 [[STOREMERGE_LCSSA]]
; CHECK-NEXT: ret ptr [[ARRAYIDX]]
;
entry: ; preds = %entry
br label %for.cond
for.cond: ; preds = %cleanup, %entry
%storemerge = phi i64 [ 0, %entry ], [ %inc7, %cleanup ]
br label %for.cond2.1
for.body3: ; preds = %for.cond2.2, %for.cond2.1
%arrayidx = getelementptr inbounds [1 x i32], ptr @c, i64 0, i64 %storemerge
ret ptr %arrayidx
cleanup: ; preds = %for.end5, %if.then
%inc7 = add nsw i64 %storemerge, 1
br label %for.cond
for.cond2.1: ; preds = %for.cond
br i1 true, label %for.inc.1, label %for.body3
for.inc.1: ; preds = %for.end.1
br i1 false, label %for.body.2, label %cleanup
for.body.2: ; preds = %for.inc.1
store i32 0, ptr @a, align 4
br label %for.cond2.2
for.cond2.2: ; preds = %for.body.2
br i1 true, label %cleanup, label %for.body3
}
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