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| // RUN: %clang_builtins %s %librt -o %t && %run %t
// REQUIRES: librt_has_clzti2
// REQUIRES: int128
//===-- clzti2_test.c - Test __clzti2 -------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file tests __clzti2 for the compiler_rt library.
//
//===----------------------------------------------------------------------===//
#include "int_lib.h"
#include <stdio.h>
#ifdef CRT_HAS_128BIT
// Returns: the number of leading 0-bits
// Precondition: a != 0
COMPILER_RT_ABI si_int __clzti2(ti_int a);
int test__clzti2(ti_int a, si_int expected)
{
si_int x = __clzti2(a);
if (x != expected)
{
twords at;
at.all = a;
printf("error in __clzti2(0x%llX%.16llX) = %d, expected %d\n",
at.s.high, at.s.low, x, expected);
}
return x != expected;
}
char assumption_1[sizeof(ti_int) == 2*sizeof(di_int)] = {0};
#endif
int main()
{
#ifdef CRT_HAS_128BIT
const int N = (int)(sizeof(ti_int) * CHAR_BIT);
if (test__clzti2(0x00000001, N-1))
return 1;
if (test__clzti2(0x00000002, N-2))
return 1;
if (test__clzti2(0x00000003, N-2))
return 1;
if (test__clzti2(0x00000004, N-3))
return 1;
if (test__clzti2(0x00000005, N-3))
return 1;
if (test__clzti2(0x0000000A, N-4))
return 1;
if (test__clzti2(0x1000000A, N*3/4+3))
return 1;
if (test__clzti2(0x2000000A, N*3/4+2))
return 1;
if (test__clzti2(0x6000000A, N*3/4+1))
return 1;
if (test__clzti2(0x8000000AuLL, N*3/4))
return 1;
if (test__clzti2(0x000005008000000AuLL, 85))
return 1;
if (test__clzti2(0x020005008000000AuLL, 70))
return 1;
if (test__clzti2(0x720005008000000AuLL, 65))
return 1;
if (test__clzti2(0x820005008000000AuLL, 64))
return 1;
if (test__clzti2(make_ti(0x0000000080000000LL, 0x8000000800000000LL), 32))
return 1;
if (test__clzti2(make_ti(0x0000000100000000LL, 0x8000000800000000LL), 31))
return 1;
if (test__clzti2(make_ti(0x1000000100000000LL, 0x8000000800000000LL), 3))
return 1;
if (test__clzti2(make_ti(0x7000000100000000LL, 0x8000000800000000LL), 1))
return 1;
if (test__clzti2(make_ti(0x8000000100000000LL, 0x8000000800000000LL), 0))
return 1;
#else
printf("skipped\n");
#endif
return 0;
}
|