1 ; Test lib call simplification of __strncpy_chk calls with various values 2 ; for len and dstlen. 3 ; 4 ; RUN: opt < %s -instcombine -S | FileCheck %s 5 6 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" 7 8 @a = common global [60 x i8] zeroinitializer, align 1 9 @b = common global [60 x i8] zeroinitializer, align 1 10 @.str = private constant [12 x i8] c"abcdefghijk\00" 11 12 ; Check cases where dstlen >= len 13 14 define void @test_simplify1() { 15 ; CHECK-LABEL: @test_simplify1( 16 %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0 17 %src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0 18 19 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32 20 call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 12, i32 60) 21 ret void 22 } 23 24 define void @test_simplify2() { 25 ; CHECK-LABEL: @test_simplify2( 26 %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0 27 %src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0 28 29 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32 30 call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 12, i32 12) 31 ret void 32 } 33 34 define void @test_simplify3() { 35 ; CHECK-LABEL: @test_simplify3( 36 %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0 37 %src = getelementptr inbounds [60 x i8]* @b, i32 0, i32 0 38 39 ; CHECK-NEXT: call i8* @strncpy 40 call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 12, i32 60) 41 ret void 42 } 43 44 ; Check cases where dstlen < len 45 46 define void @test_no_simplify1() { 47 ; CHECK-LABEL: @test_no_simplify1( 48 %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0 49 %src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0 50 51 ; CHECK-NEXT: call i8* @__strncpy_chk 52 call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 8, i32 4) 53 ret void 54 } 55 56 define void @test_no_simplify2() { 57 ; CHECK-LABEL: @test_no_simplify2( 58 %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0 59 %src = getelementptr inbounds [60 x i8]* @b, i32 0, i32 0 60 61 ; CHECK-NEXT: call i8* @__strncpy_chk 62 call i8* @__strncpy_chk(i8* %dst, i8* %src, i32 8, i32 0) 63 ret void 64 } 65 66 declare i8* @__strncpy_chk(i8*, i8*, i32, i32) 67
