| ; RUN: opt -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(unswitch<nontrivial>,loop-reduce,simplify-cfg)' -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 i32* @test() { |
| ; CHECK-LABEL: @test |
| ; |
| 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], [1 x i32]* @c, i64 0, i64 %storemerge |
| ret i32* %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, i32* @a, align 4 |
| br label %for.cond2.2 |
| |
| for.cond2.2: ; preds = %for.body.2 |
| br i1 true, label %cleanup, label %for.body3 |
| } |
