1 // NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py 2 3 // RUN: %clang_cc1 -triple x86_64 -S -emit-llvm -o - %s | FileCheck %s 4 // 5 // Verifies that clang detects memcpy inline version and uses it instead of the builtin. 6 7 typedef unsigned long size_t; 8 9 // Clang requires these attributes for a function to be redefined. 10 #define AVAILABLE_EXTERNALLY extern inline __attribute__((always_inline)) __attribute__((gnu_inline)) 11 12 // Clang recognizes an inline builtin and renames it to prevent conflict with builtins. 13 AVAILABLE_EXTERNALLY void *memcpy(void *a, const void *b, size_t c) { 14 asm("# memcpy.inline marker"); 15 return __builtin_memcpy(a, b, c); 16 } 17 18 // CHECK-LABEL: @foo( 19 // CHECK-NEXT: entry: 20 // CHECK-NEXT: [[A_ADDR_I:%.*]] = alloca i8*, align 8 21 // CHECK-NEXT: [[B_ADDR_I:%.*]] = alloca i8*, align 8 22 // CHECK-NEXT: [[C_ADDR_I:%.*]] = alloca i64, align 8 23 // CHECK-NEXT: [[A_ADDR:%.*]] = alloca i8*, align 8 24 // CHECK-NEXT: [[B_ADDR:%.*]] = alloca i8*, align 8 25 // CHECK-NEXT: [[C_ADDR:%.*]] = alloca i64, align 8 26 // CHECK-NEXT: store i8* [[A:%.*]], i8** [[A_ADDR]], align 8 27 // CHECK-NEXT: store i8* [[B:%.*]], i8** [[B_ADDR]], align 8 28 // CHECK-NEXT: store i64 [[C:%.*]], i64* [[C_ADDR]], align 8 29 // CHECK-NEXT: [[TMP0:%.*]] = load i8*, i8** [[A_ADDR]], align 8 30 // CHECK-NEXT: [[TMP1:%.*]] = load i8*, i8** [[B_ADDR]], align 8 31 // CHECK-NEXT: [[TMP2:%.*]] = load i64, i64* [[C_ADDR]], align 8 32 // CHECK-NEXT: store i8* [[TMP0]], i8** [[A_ADDR_I]], align 8 33 // CHECK-NEXT: store i8* [[TMP1]], i8** [[B_ADDR_I]], align 8 34 // CHECK-NEXT: store i64 [[TMP2]], i64* [[C_ADDR_I]], align 8 35 // CHECK-NEXT: call void asm sideeffect "# memcpy.inline marker", "~{dirflag},~{fpsr},~{flags}"() #[[ATTR4:[0-9]+]], !srcloc !2 36 // CHECK-NEXT: [[TMP3:%.*]] = load i8*, i8** [[A_ADDR_I]], align 8 37 // CHECK-NEXT: [[TMP4:%.*]] = load i8*, i8** [[B_ADDR_I]], align 8 38 // CHECK-NEXT: [[TMP5:%.*]] = load i64, i64* [[C_ADDR_I]], align 8 39 // CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 [[TMP3]], i8* align 1 [[TMP4]], i64 [[TMP5]], i1 false) #[[ATTR4]] 40 // CHECK-NEXT: ret i8* [[TMP3]] 41 // 42 void *foo(void *a, const void *b, size_t c) { 43 return memcpy(a, b, c); 44 } 45 46 // CHECK-LABEL: @bar( 47 // CHECK-NEXT: entry: 48 // CHECK-NEXT: [[A_ADDR:%.*]] = alloca i8*, align 8 49 // CHECK-NEXT: [[B_ADDR:%.*]] = alloca i8*, align 8 50 // CHECK-NEXT: [[C_ADDR:%.*]] = alloca i64, align 8 51 // CHECK-NEXT: [[CPY:%.*]] = alloca i8* (i8*, i8*, i64)*, align 8 52 // CHECK-NEXT: store i8* [[A:%.*]], i8** [[A_ADDR]], align 8 53 // CHECK-NEXT: store i8* [[B:%.*]], i8** [[B_ADDR]], align 8 54 // CHECK-NEXT: store i64 [[C:%.*]], i64* [[C_ADDR]], align 8 55 // CHECK-NEXT: [[TMP0:%.*]] = load i64, i64* [[C_ADDR]], align 8 56 // CHECK-NEXT: [[CMP:%.*]] = icmp ugt i64 [[TMP0]], 10 57 // CHECK-NEXT: [[TMP1:%.*]] = zext i1 [[CMP]] to i64 58 // CHECK-NEXT: [[COND:%.*]] = select i1 [[CMP]], i8* (i8*, i8*, i64)* @memcpy, i8* (i8*, i8*, i64)* @foo 59 // CHECK-NEXT: store i8* (i8*, i8*, i64)* [[COND]], i8* (i8*, i8*, i64)** [[CPY]], align 8 60 // CHECK-NEXT: [[TMP2:%.*]] = load i8* (i8*, i8*, i64)*, i8* (i8*, i8*, i64)** [[CPY]], align 8 61 // CHECK-NEXT: [[TMP3:%.*]] = load i8*, i8** [[A_ADDR]], align 8 62 // CHECK-NEXT: [[TMP4:%.*]] = load i8*, i8** [[B_ADDR]], align 8 63 // CHECK-NEXT: [[TMP5:%.*]] = load i64, i64* [[C_ADDR]], align 8 64 // CHECK-NEXT: [[CALL:%.*]] = call i8* [[TMP2]](i8* [[TMP3]], i8* [[TMP4]], i64 [[TMP5]]) 65 // CHECK-NEXT: ret void 66 // 67 void bar(void *a, const void *b, size_t c) { 68 void *(*cpy)(void *, const void *, size_t) = c > 10 ? memcpy : foo; 69 cpy(a, b, c); 70 } 71