72 lines
3.3 KiB
LLVM
72 lines
3.3 KiB
LLVM
; Test lib call simplification of __strncpy_chk calls with various values
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; for len and dstlen.
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;
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; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128"
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@a = common global [60 x i8] zeroinitializer, align 1
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@b = common global [60 x i8] zeroinitializer, align 1
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@.str = private constant [12 x i8] c"abcdefghijk\00"
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; Check cases where dstlen >= len
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define i8* @test_simplify1() {
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; CHECK-LABEL: @test_simplify1(
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%dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
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%src = getelementptr inbounds [12 x i8], [12 x i8]* @.str, i32 0, i32 0
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 1 getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* align 1 getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i32 0, i32 0), i32 12, i1 false)
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; CHECK-NEXT: ret i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0)
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%ret = call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 12, i32 60)
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ret i8* %ret
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}
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define i8* @test_simplify2() {
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; CHECK-LABEL: @test_simplify2(
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%dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
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%src = getelementptr inbounds [12 x i8], [12 x i8]* @.str, i32 0, i32 0
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; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(i8* align 1 getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* align 1 getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i32 0, i32 0), i32 12, i1 false)
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; CHECK-NEXT: ret i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0)
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%ret = call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 12, i32 12)
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ret i8* %ret
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}
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define i8* @test_simplify3() {
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; CHECK-LABEL: @test_simplify3(
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%dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
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%src = getelementptr inbounds [60 x i8], [60 x i8]* @b, i32 0, i32 0
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; CHECK-NEXT: %strncpy = call i8* @strncpy(i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* getelementptr inbounds ([60 x i8], [60 x i8]* @b, i32 0, i32 0), i32 12)
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; CHECK-NEXT: ret i8* %strncpy
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%ret = call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 12, i32 60)
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ret i8* %ret
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}
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; Check cases where dstlen < len
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define i8* @test_no_simplify1() {
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; CHECK-LABEL: @test_no_simplify1(
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%dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
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%src = getelementptr inbounds [12 x i8], [12 x i8]* @.str, i32 0, i32 0
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; CHECK-NEXT: %ret = call i8* @__strncpy_chk(i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* getelementptr inbounds ([12 x i8], [12 x i8]* @.str, i32 0, i32 0), i32 8, i32 4)
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; CHECK-NEXT: ret i8* %ret
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%ret = call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 8, i32 4)
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ret i8* %ret
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}
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define i8* @test_no_simplify2() {
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; CHECK-LABEL: @test_no_simplify2(
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%dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0
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%src = getelementptr inbounds [60 x i8], [60 x i8]* @b, i32 0, i32 0
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; CHECK-NEXT: %ret = call i8* @__strncpy_chk(i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* getelementptr inbounds ([60 x i8], [60 x i8]* @b, i32 0, i32 0), i32 8, i32 0)
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; CHECK-NEXT: ret i8* %ret
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%ret = call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 8, i32 0)
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ret i8* %ret
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}
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declare i8* @__strncpy_chk(i8*, i8*, i32, i32)
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