blob: 86cc97e2a3bfb005efae2191b89f5f2d63af86d3 (
plain)
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
26
27
28
29
|
//===-- GPU implementation of the clock function --------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "time_utils.h"
#include "src/time/clock.h"
namespace LIBC_NAMESPACE {
LLVM_LIBC_FUNCTION(clock_t, clock, ()) {
if (!GPU_CLOCKS_PER_SEC)
return clock_t(0);
uint64_t ticks = gpu::fixed_frequency_clock();
// We need to convert between the GPU's fixed frequency and whatever `time.h`
// declares it to be. This is done so that dividing the result of this
// function by 'CLOCKS_PER_SEC' yields the elapsed time.
if (GPU_CLOCKS_PER_SEC > CLOCKS_PER_SEC)
return clock_t(ticks / (GPU_CLOCKS_PER_SEC / CLOCKS_PER_SEC));
return clock_t(ticks * (CLOCKS_PER_SEC / GPU_CLOCKS_PER_SEC));
}
} // namespace LIBC_NAMESPACE
|
