1 ; Test lib call simplification of __strcpy_chk calls with various values 2 ; for src, dst, and slen. 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 slen >= strlen (src). 13 14 define i8* @test_simplify1() { 15 ; CHECK-LABEL: @test_simplify1( 16 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0 17 %src = getelementptr inbounds [12 x i8], [12 x i8]* @.str, i32 0, i32 0 18 19 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(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 12, i32 1, i1 false) 20 ; CHECK-NEXT: ret i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0) 21 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 60) 22 ret i8* %ret 23 } 24 25 define i8* @test_simplify2() { 26 ; CHECK-LABEL: @test_simplify2( 27 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0 28 %src = getelementptr inbounds [12 x i8], [12 x i8]* @.str, i32 0, i32 0 29 30 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(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 12, i32 1, i1 false) 31 ; CHECK-NEXT: ret i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0) 32 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 12) 33 ret i8* %ret 34 } 35 36 define i8* @test_simplify3() { 37 ; CHECK-LABEL: @test_simplify3( 38 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0 39 %src = getelementptr inbounds [12 x i8], [12 x i8]* @.str, i32 0, i32 0 40 41 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32(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 12, i32 1, i1 false) 42 ; CHECK-NEXT: ret i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0) 43 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 -1) 44 ret i8* %ret 45 } 46 47 ; Check cases where there are no string constants. 48 49 define i8* @test_simplify4() { 50 ; CHECK-LABEL: @test_simplify4( 51 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0 52 %src = getelementptr inbounds [60 x i8], [60 x i8]* @b, i32 0, i32 0 53 54 ; CHECK-NEXT: %strcpy = call i8* @strcpy(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)) 55 ; CHECK-NEXT: ret i8* %strcpy 56 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 -1) 57 ret i8* %ret 58 } 59 60 ; Check case where the string length is not constant. 61 62 define i8* @test_simplify5() { 63 ; CHECK-LABEL: @test_simplify5( 64 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0 65 %src = getelementptr inbounds [12 x i8], [12 x i8]* @.str, i32 0, i32 0 66 67 ; CHECK-NEXT: %len = call i32 @llvm.objectsize.i32.p0i8(i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i1 false) 68 ; CHECK-NEXT: %1 = call i8* @__memcpy_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 12, i32 %len) 69 ; CHECK-NEXT: ret i8* %1 70 %len = call i32 @llvm.objectsize.i32.p0i8(i8* %dst, i1 false) 71 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 %len) 72 ret i8* %ret 73 } 74 75 ; Check case where the source and destination are the same. 76 77 define i8* @test_simplify6() { 78 ; CHECK-LABEL: @test_simplify6( 79 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0 80 81 ; CHECK-NEXT: %len = call i32 @llvm.objectsize.i32.p0i8(i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i1 false) 82 ; CHECK-NEXT: %ret = call i8* @__strcpy_chk(i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i8* getelementptr inbounds ([60 x i8], [60 x i8]* @a, i32 0, i32 0), i32 %len) 83 ; CHECK-NEXT: ret i8* %ret 84 %len = call i32 @llvm.objectsize.i32.p0i8(i8* %dst, i1 false) 85 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %dst, i32 %len) 86 ret i8* %ret 87 } 88 89 ; Check case where slen < strlen (src). 90 91 define i8* @test_no_simplify1() { 92 ; CHECK-LABEL: @test_no_simplify1( 93 %dst = getelementptr inbounds [60 x i8], [60 x i8]* @a, i32 0, i32 0 94 %src = getelementptr inbounds [60 x i8], [60 x i8]* @b, i32 0, i32 0 95 96 ; CHECK-NEXT: %ret = call i8* @__strcpy_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) 97 ; CHECK-NEXT: ret i8* %ret 98 %ret = call i8* @__strcpy_chk(i8* %dst, i8* %src, i32 8) 99 ret i8* %ret 100 } 101 102 declare i8* @__strcpy_chk(i8*, i8*, i32) nounwind 103 declare i32 @llvm.objectsize.i32.p0i8(i8*, i1) nounwind readonly 104
