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5729095d2d
Make test-only builds of libdeflate support an environmental variable LIBDEFLATE_DISABLE_CPU_FEATURES that contains a list of CPU features to disable like "avx512bw,avx2,sse2". This makes it possible to test all the variants of dynamically dispatched code without editing the source code. Note, this environmental variable is not a stable interface, so put the support for it behind a scary-looking option TEST_SUPPORT__DO_NOT_USE.
84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
/*
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* cpu_features_common.h - code shared by all lib/$arch/cpu_features.c
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*
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* Copyright 2020 Eric Biggers
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#if defined(TEST_SUPPORT__DO_NOT_USE) && !defined(FREESTANDING)
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# define _GNU_SOURCE 1 /* for strdup() and strtok_r() */
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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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#endif
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#include "lib_common.h"
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struct cpu_feature {
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u32 bit;
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const char *name;
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};
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#if defined(TEST_SUPPORT__DO_NOT_USE) && !defined(FREESTANDING)
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/* Disable any features that are listed in $LIBDEFLATE_DISABLE_CPU_FEATURES. */
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static inline void
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disable_cpu_features_for_testing(u32 *features,
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const struct cpu_feature *feature_table,
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size_t feature_table_length)
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{
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char *env_value, *strbuf, *p, *saveptr = NULL;
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size_t i;
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env_value = getenv("LIBDEFLATE_DISABLE_CPU_FEATURES");
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if (!env_value)
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return;
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strbuf = strdup(env_value);
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if (!strbuf)
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abort();
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p = strtok_r(strbuf, ",", &saveptr);
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while (p) {
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for (i = 0; i < feature_table_length; i++) {
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if (strcmp(p, feature_table[i].name) == 0) {
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*features &= ~feature_table[i].bit;
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break;
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}
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}
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if (i == feature_table_length) {
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fprintf(stderr,
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"unrecognized feature in LIBDEFLATE_DISABLE_CPU_FEATURES: \"%s\"\n",
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p);
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abort();
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}
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p = strtok_r(NULL, ",", &saveptr);
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}
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free(strbuf);
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}
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#else /* TEST_SUPPORT__DO_NOT_USE */
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static inline void
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disable_cpu_features_for_testing(u32 *features,
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const struct cpu_feature *feature_table,
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size_t feature_table_length)
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{
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}
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#endif /* !TEST_SUPPORT__DO_NOT_USE */
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