1 ; RUN: opt -loop-unswitch -loop-reduce -loop-simplifycfg -verify-memoryssa -S %s | FileCheck %s
3 ; TODO: also run with NPM, but currently LSR does not preserve LCSSA, causing a verification failure on the test.
4 ; opt -passes='loop-mssa(simple-loop-unswitch<nontrivial>,loop-reduce,simplifycfg)' -verify-memoryssa -S %s | FileCheck %s
6 ; Test case for PR47557.
8 ; REQUIRES: x86-registered-target
10 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
11 target triple = "x86_64-unknown-linux-gnu"
13 @a = external global i32, align 4
14 @c = external global [1 x i32], align 4
19 entry: ; preds = %entry
22 for.cond: ; preds = %cleanup, %entry
23 %storemerge = phi i64 [ 0, %entry ], [ %inc7, %cleanup ]
26 for.body3: ; preds = %for.cond2.2, %for.cond2.1
27 %arrayidx = getelementptr inbounds [1 x i32], [1 x i32]* @c, i64 0, i64 %storemerge
30 cleanup: ; preds = %for.end5, %if.then
31 %inc7 = add nsw i64 %storemerge, 1
34 for.cond2.1: ; preds = %for.cond
35 br i1 true, label %for.inc.1, label %for.body3
37 for.inc.1: ; preds = %for.end.1
38 br i1 false, label %for.body.2, label %cleanup
40 for.body.2: ; preds = %for.inc.1
41 store i32 0, i32* @a, align 4
44 for.cond2.2: ; preds = %for.body.2
45 br i1 true, label %cleanup, label %for.body3