| ; RUN: opt -loop-idiom -S < %s | FileCheck %s |
| |
| target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| define void @test1() { |
| entry: |
| br label %for.body.preheader |
| |
| for.body.preheader: ; preds = %for.cond |
| br label %for.body |
| |
| for.body: ; preds = %for.body, %for.body.preheader |
| %indvars.iv = phi i32 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ] |
| %add.ptr3 = getelementptr inbounds i32, i32* null, i32 %indvars.iv |
| %add.ptr4 = getelementptr inbounds i32, i32* %add.ptr3, i32 1 |
| %0 = load i32, i32* %add.ptr4, align 4 |
| store i32 %0, i32* %add.ptr3, align 4 |
| %indvars.iv.next = add nsw i32 %indvars.iv, 1 |
| %exitcond = icmp ne i32 %indvars.iv.next, 6 |
| br i1 %exitcond, label %for.body, label %for.body.preheader |
| } |
| |
| ; CHECK-LABEL: define void @test1( |
| ; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 null, i8* align 4 inttoptr (i64 4 to i8*), i64 24, i1 false) |
| ; CHECK-NOT: store |
| |
| define void @test1_no_null_opt() #0 { |
| entry: |
| br label %for.body.preheader |
| |
| for.body.preheader: ; preds = %for.cond |
| br label %for.body |
| |
| for.body: ; preds = %for.body, %for.body.preheader |
| %indvars.iv = phi i32 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ] |
| %add.ptr3 = getelementptr inbounds i32, i32* null, i32 %indvars.iv |
| %add.ptr4 = getelementptr inbounds i32, i32* %add.ptr3, i32 1 |
| %0 = load i32, i32* %add.ptr4, align 4 |
| store i32 %0, i32* %add.ptr3, align 4 |
| %indvars.iv.next = add nsw i32 %indvars.iv, 1 |
| %exitcond = icmp ne i32 %indvars.iv.next, 6 |
| br i1 %exitcond, label %for.body, label %for.body.preheader |
| } |
| |
| ; CHECK-LABEL: define void @test1_no_null_opt( |
| ; CHECK-NOT: call void @llvm.memcpy |
| ; CHECK: getelementptr |
| ; CHECK: getelementptr |
| ; CHECK: load |
| ; CHECK: store |
| |
| attributes #0 = { "null-pointer-is-valid"="true" } |