1 ; RUN: opt -loop-idiom -S < %s | FileCheck %s 2 3 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 4 target triple = "x86_64-unknown-linux-gnu" 5 6 define void @test1() { 7 entry: 8 br label %for.body.preheader 9 10 for.body.preheader: ; preds = %for.cond 11 br label %for.body 12 13 for.body: ; preds = %for.body, %for.body.preheader 14 %indvars.iv = phi i32 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ] 15 %add.ptr3 = getelementptr inbounds i32, i32* null, i32 %indvars.iv 16 %add.ptr4 = getelementptr inbounds i32, i32* %add.ptr3, i32 1 17 %0 = load i32, i32* %add.ptr4, align 4 18 store i32 %0, i32* %add.ptr3, align 4 19 %indvars.iv.next = add nsw i32 %indvars.iv, 1 20 %exitcond = icmp ne i32 %indvars.iv.next, 6 21 br i1 %exitcond, label %for.body, label %for.body.preheader 22 } 23 24 ; CHECK-LABEL: define void @test1( 25 ; CHECK: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 4 null, i8* align 4 inttoptr (i64 4 to i8*), i64 24, i1 false) 26 ; CHECK-NOT: store 27 28 define void @test1_no_null_opt() #0 { 29 entry: 30 br label %for.body.preheader 31 32 for.body.preheader: ; preds = %for.cond 33 br label %for.body 34 35 for.body: ; preds = %for.body, %for.body.preheader 36 %indvars.iv = phi i32 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ] 37 %add.ptr3 = getelementptr inbounds i32, i32* null, i32 %indvars.iv 38 %add.ptr4 = getelementptr inbounds i32, i32* %add.ptr3, i32 1 39 %0 = load i32, i32* %add.ptr4, align 4 40 store i32 %0, i32* %add.ptr3, align 4 41 %indvars.iv.next = add nsw i32 %indvars.iv, 1 42 %exitcond = icmp ne i32 %indvars.iv.next, 6 43 br i1 %exitcond, label %for.body, label %for.body.preheader 44 } 45 46 ; CHECK-LABEL: define void @test1_no_null_opt( 47 ; CHECK-NOT: call void @llvm.memcpy 48 ; CHECK: getelementptr 49 ; CHECK: getelementptr 50 ; CHECK: load 51 ; CHECK: store 52 53 attributes #0 = { "null-pointer-is-valid"="true" } 54
