1 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2 ; RUN: opt -simple-loop-unswitch -loop-reduce -loop-simplifycfg -verify-memoryssa -S %s | FileCheck %s
4 ; TODO: also run with NPM, but currently LSR does not preserve LCSSA, causing a verification failure on the test.
5 ; opt -passes='loop-mssa(simple-loop-unswitch<nontrivial>,loop-reduce,simplifycfg)' -verify-memoryssa -S %s | FileCheck %s
7 ; Test case for PR47557.
9 ; REQUIRES: x86-registered-target
11 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
12 target triple = "x86_64-unknown-linux-gnu"
14 @a = external global i32, align 4
15 @c = external global [1 x i32], align 4
20 ; CHECK-NEXT: switch i32 0, label [[ENTRY_SPLIT:%.*]] [
21 ; CHECK-NEXT: i32 1, label [[FOR_BODY3SPLIT:%.*]]
22 ; CHECK-NEXT: i32 2, label [[FOR_COND2_2_FOR_BODY3_CRIT_EDGE:%.*]]
25 ; CHECK-NEXT: br label [[FOR_COND:%.*]]
27 ; CHECK-NEXT: [[STOREMERGE:%.*]] = phi i64 [ 0, [[ENTRY_SPLIT]] ], [ [[INC7:%.*]], [[FOR_COND]] ]
28 ; CHECK-NEXT: [[INC7]] = add nsw i64 [[STOREMERGE]], 1
29 ; CHECK-NEXT: br label [[FOR_COND]]
30 ; CHECK: for.body3split:
31 ; CHECK-NEXT: br label [[FOR_BODY3:%.*]]
32 ; CHECK: for.cond2.2.for.body3_crit_edge:
33 ; CHECK-NEXT: br label [[FOR_BODY3]]
35 ; CHECK-NEXT: [[STOREMERGE_LCSSA:%.*]] = phi i64 [ poison, [[FOR_COND2_2_FOR_BODY3_CRIT_EDGE]] ], [ poison, [[FOR_BODY3SPLIT]] ]
36 ; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds [1 x i32], ptr @c, i64 0, i64 [[STOREMERGE_LCSSA]]
37 ; CHECK-NEXT: ret ptr [[ARRAYIDX]]
39 entry: ; preds = %entry
42 for.cond: ; preds = %cleanup, %entry
43 %storemerge = phi i64 [ 0, %entry ], [ %inc7, %cleanup ]
46 for.body3: ; preds = %for.cond2.2, %for.cond2.1
47 %arrayidx = getelementptr inbounds [1 x i32], ptr @c, i64 0, i64 %storemerge
50 cleanup: ; preds = %for.end5, %if.then
51 %inc7 = add nsw i64 %storemerge, 1
54 for.cond2.1: ; preds = %for.cond
55 br i1 true, label %for.inc.1, label %for.body3
57 for.inc.1: ; preds = %for.end.1
58 br i1 false, label %for.body.2, label %cleanup
60 for.body.2: ; preds = %for.inc.1
61 store i32 0, ptr @a, align 4
64 for.cond2.2: ; preds = %for.body.2
65 br i1 true, label %cleanup, label %for.body3