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1; RUN: opt -passes=loop-idiom -S < %s | FileCheck %s2 3target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"4target triple = "x86_64-unknown-linux-gnu"5 6define void @test1() {7entry:8 br label %for.body.preheader9 10for.body.preheader: ; preds = %for.cond11 br label %for.body12 13for.body: ; preds = %for.body, %for.body.preheader14 %indvars.iv = phi i32 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ]15 %add.ptr3 = getelementptr inbounds i32, ptr null, i32 %indvars.iv16 %add.ptr4 = getelementptr inbounds i32, ptr %add.ptr3, i32 117 %0 = load i32, ptr %add.ptr4, align 418 store i32 %0, ptr %add.ptr3, align 419 %indvars.iv.next = add nsw i32 %indvars.iv, 120 %exitcond = icmp ne i32 %indvars.iv.next, 621 br i1 %exitcond, label %for.body, label %for.body.preheader22}23 24; CHECK-LABEL: define void @test1(25; CHECK: call void @llvm.memcpy.p0.p0.i64(ptr align 4 null, ptr align 4 inttoptr (i64 4 to ptr), i64 24, i1 false)26; CHECK-NOT: store27 28define void @test1_no_null_opt() #0 {29entry:30 br label %for.body.preheader31 32for.body.preheader: ; preds = %for.cond33 br label %for.body34 35for.body: ; preds = %for.body, %for.body.preheader36 %indvars.iv = phi i32 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.body ]37 %add.ptr3 = getelementptr inbounds i32, ptr null, i32 %indvars.iv38 %add.ptr4 = getelementptr inbounds i32, ptr %add.ptr3, i32 139 %0 = load i32, ptr %add.ptr4, align 440 store i32 %0, ptr %add.ptr3, align 441 %indvars.iv.next = add nsw i32 %indvars.iv, 142 %exitcond = icmp ne i32 %indvars.iv.next, 643 br i1 %exitcond, label %for.body, label %for.body.preheader44}45 46; CHECK-LABEL: define void @test1_no_null_opt(47; CHECK-NOT: call void @llvm.memcpy48; CHECK: getelementptr49; CHECK: getelementptr50; CHECK: load51; CHECK: store52 53attributes #0 = { null_pointer_is_valid }54