File: memcpy-no-nobuiltin-if-not-emitted.c

package info (click to toggle)
llvm-toolchain-11 1%3A11.0.1-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 995,808 kB
  • sloc: cpp: 4,767,656; ansic: 760,916; asm: 477,436; python: 170,940; objc: 69,804; lisp: 29,914; sh: 23,855; f90: 18,173; pascal: 7,551; perl: 7,471; ml: 5,603; awk: 3,489; makefile: 2,573; xml: 915; cs: 573; fortran: 503; javascript: 452
file content (25 lines) | stat: -rw-r--r-- 815 bytes parent folder | download | duplicates (2) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
 
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -S -emit-llvm -o - %s | FileCheck %s
//
// Verifies that clang doesn't mark an inline builtin definition as `nobuiltin`
// if the builtin isn't emittable.

typedef unsigned long size_t;

// always_inline is used so clang will emit this body. Otherwise, we need >=
// -O1.
#define AVAILABLE_EXTERNALLY extern inline __attribute__((always_inline)) \
    __attribute__((gnu_inline))

AVAILABLE_EXTERNALLY void *memcpy(void *a, const void *b, size_t c) {
  return __builtin_memcpy(a, b, c);
}

// CHECK-LABEL: define void @foo
void foo(void *a, const void *b, size_t c) {
  // Clang will always _emit_ this as memcpy. LLVM turns it into @llvm.memcpy
  // later on if optimizations are enabled.
  // CHECK: call i8* @memcpy
  memcpy(a, b, c);
}

// CHECK-NOT: nobuiltin