01220bf9d2
Summary: During MIPS implementation work for FreeBSD, John Baldwin (jhb@FreeBSD.org) found that gcc 6.x emits calls to __ffssi2() when compiling libc and some userland programs in the base system. Add it to compiler-rt's builtins, based off of the existing __ffsdi2() implementation. Also update the CMake files and add a test case. Reviewers: howard.hinnant, weimingz, rengolin, compnerd Reviewed By: weimingz Subscribers: dberris, mgorny, llvm-commits, emaste Differential Revision: https://reviews.llvm.org/D31721 llvm-svn: 299675
58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
// RUN: %clang_builtins %s %librt -o %t && %run %t
|
|
//===-- ffssi2_test.c - Test __ffssi2 -------------------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is dual licensed under the MIT and the University of Illinois Open
|
|
// Source Licenses. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file tests __ffssi2 for the compiler_rt library.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "int_lib.h"
|
|
#include <stdio.h>
|
|
|
|
// Returns: the index of the least significant 1-bit in a, or
|
|
// the value zero if a is zero. The least significant bit is index one.
|
|
|
|
COMPILER_RT_ABI si_int __ffssi2(si_int a);
|
|
|
|
int test__ffssi2(si_int a, si_int expected)
|
|
{
|
|
si_int x = __ffssi2(a);
|
|
if (x != expected)
|
|
printf("error in __ffssi2(0x%X) = %d, expected %d\n", a, x, expected);
|
|
return x != expected;
|
|
}
|
|
|
|
int main()
|
|
{
|
|
if (test__ffssi2(0x00000000, 0))
|
|
return 1;
|
|
if (test__ffssi2(0x00000001, 1))
|
|
return 1;
|
|
if (test__ffssi2(0x00000002, 2))
|
|
return 1;
|
|
if (test__ffssi2(0x00000003, 1))
|
|
return 1;
|
|
if (test__ffssi2(0x00000004, 3))
|
|
return 1;
|
|
if (test__ffssi2(0x00000005, 1))
|
|
return 1;
|
|
if (test__ffssi2(0x0000000A, 2))
|
|
return 1;
|
|
if (test__ffssi2(0x10000000, 29))
|
|
return 1;
|
|
if (test__ffssi2(0x20000000, 30))
|
|
return 1;
|
|
if (test__ffssi2(0x60000000, 30))
|
|
return 1;
|
|
if (test__ffssi2(0x80000000u, 32))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|