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# ignore-this-changeset Depends on D28954 Differential Revision: https://phabricator.services.mozilla.com/D28956 --HG-- extra : moz-landing-system : lando
43 lines
1.1 KiB
C++
43 lines
1.1 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* compile-time and runtime tests for whether to use MIPS-specific extensions */
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#include "mips.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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enum {
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MIPS_FLAG_LOONGSON3 = 1,
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};
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static unsigned get_mips_cpu_flags(void) {
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unsigned flags = 0;
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FILE* fin;
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fin = fopen("/proc/cpuinfo", "r");
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if (fin != nullptr) {
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char buf[1024];
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memset(buf, 0, sizeof(buf));
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fread(buf, sizeof(char), sizeof(buf) - 1, fin);
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fclose(fin);
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if (strstr(buf, "Loongson-3")) flags |= MIPS_FLAG_LOONGSON3;
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}
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return flags;
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}
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static bool check_loongson3(void) {
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// Cache a local copy so we only have to read /proc/cpuinfo once.
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static unsigned mips_cpu_flags = get_mips_cpu_flags();
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return (mips_cpu_flags & MIPS_FLAG_LOONGSON3) != 0;
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}
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namespace mozilla {
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namespace mips_private {
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bool isLoongson3 = check_loongson3();
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} // namespace mips_private
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} // namespace mozilla
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