1 ; Test lib call simplification of __stpcpy_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 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* @__stpcpy_chk(i8* %dst, i8* %src, 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* @__stpcpy_chk(i8* %dst, i8* %src, 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 [12 x i8]* @.str, i32 0, i32 0 38 39 ; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i32 40 call i8* @__stpcpy_chk(i8* %dst, i8* %src, i32 -1) 41 ret void 42 } 43 44 ; Check cases where there are no string constants. 45 46 define void @test_simplify4() { 47 ; CHECK-LABEL: @test_simplify4( 48 %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0 49 %src = getelementptr inbounds [60 x i8]* @b, i32 0, i32 0 50 51 ; CHECK-NEXT: call i8* @stpcpy 52 call i8* @__stpcpy_chk(i8* %dst, i8* %src, i32 -1) 53 ret void 54 } 55 56 ; Check case where the string length is not constant. 57 58 define i8* @test_simplify5() { 59 ; CHECK-LABEL: @test_simplify5( 60 %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0 61 %src = getelementptr inbounds [12 x i8]* @.str, i32 0, i32 0 62 63 ; CHECK: @__memcpy_chk 64 %len = call i32 @llvm.objectsize.i32.p0i8(i8* %dst, i1 false) 65 %ret = call i8* @__stpcpy_chk(i8* %dst, i8* %src, i32 %len) 66 ; CHECK: ret i8* getelementptr inbounds ([60 x i8]* @a, i32 0, i32 11) 67 ret i8* %ret 68 } 69 70 ; Check case where the source and destination are the same. 71 72 define i8* @test_simplify6() { 73 ; CHECK-LABEL: @test_simplify6( 74 %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0 75 76 ; CHECK: [[LEN:%[a-z]+]] = call i32 @strlen 77 ; CHECK-NEXT: getelementptr inbounds [60 x i8]* @a, i32 0, i32 [[LEN]] 78 %len = call i32 @llvm.objectsize.i32.p0i8(i8* %dst, i1 false) 79 %ret = call i8* @__stpcpy_chk(i8* %dst, i8* %dst, i32 %len) 80 ret i8* %ret 81 } 82 83 ; Check case where slen < strlen (src). 84 85 define void @test_no_simplify1() { 86 ; CHECK-LABEL: @test_no_simplify1( 87 %dst = getelementptr inbounds [60 x i8]* @a, i32 0, i32 0 88 %src = getelementptr inbounds [60 x i8]* @b, i32 0, i32 0 89 90 ; CHECK-NEXT: call i8* @__stpcpy_chk 91 call i8* @__stpcpy_chk(i8* %dst, i8* %src, i32 8) 92 ret void 93 } 94 95 declare i8* @__stpcpy_chk(i8*, i8*, i32) nounwind 96 declare i32 @llvm.objectsize.i32.p0i8(i8*, i1) nounwind readonly 97
