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