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git://sourceware.org/git/glibc.git
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9620398097
Install <sys/platform/x86.h> so that programmers can do
#if __has_include(<sys/platform/x86.h>)
#include <sys/platform/x86.h>
#endif
...
if (CPU_FEATURE_USABLE (SSE2))
...
if (CPU_FEATURE_USABLE (AVX2))
...
<sys/platform/x86.h> exports only:
enum
{
COMMON_CPUID_INDEX_1 = 0,
COMMON_CPUID_INDEX_7,
COMMON_CPUID_INDEX_80000001,
COMMON_CPUID_INDEX_D_ECX_1,
COMMON_CPUID_INDEX_80000007,
COMMON_CPUID_INDEX_80000008,
COMMON_CPUID_INDEX_7_ECX_1,
/* Keep the following line at the end. */
COMMON_CPUID_INDEX_MAX
};
struct cpuid_features
{
struct cpuid_registers cpuid;
struct cpuid_registers usable;
};
struct cpu_features
{
struct cpu_features_basic basic;
struct cpuid_features features[COMMON_CPUID_INDEX_MAX];
};
/* Get a pointer to the CPU features structure. */
extern const struct cpu_features *__x86_get_cpu_features
(unsigned int max) __attribute__ ((const));
Since all feature checks are done through macros, programs compiled with
a newer <sys/platform/x86.h> are compatible with the older glibc binaries
as long as the layout of struct cpu_features is identical. The features
array can be expanded with backward binary compatibility for both .o and
.so files. When COMMON_CPUID_INDEX_MAX is increased to support new
processor features, __x86_get_cpu_features in the older glibc binaries
returns NULL and HAS_CPU_FEATURE/CPU_FEATURE_USABLE return false on the
new processor feature. No new symbol version is neeeded.
Both CPU_FEATURE_USABLE and HAS_CPU_FEATURE are provided. HAS_CPU_FEATURE
can be used to identify processor features.
Note: Although GCC has __builtin_cpu_supports, it only supports a subset
of <sys/platform/x86.h> and it is equivalent to CPU_FEATURE_USABLE. It
doesn't support HAS_CPU_FEATURE.
193 lines
6.0 KiB
C
193 lines
6.0 KiB
C
/* Test CPU feature data against __builtin_cpu_supports.
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This file is part of the GNU C Library.
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Copyright (C) 2020 Free Software Foundation, Inc.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sys/platform/x86.h>
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#include <stdio.h>
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int
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check_supports (int supports, int usable, const char *supports_name,
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const char *name)
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{
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printf ("Checking %s:\n", name);
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printf (" %s: %d\n", name, usable);
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printf (" __builtin_cpu_supports (%s): %d\n",
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supports_name, supports);
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if ((supports != 0) != (usable != 0))
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{
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printf (" *** failure ***\n");
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return 1;
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}
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return 0;
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}
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#define CHECK_SUPPORTS(str, name) \
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check_supports (__builtin_cpu_supports (#str), \
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CPU_FEATURE_USABLE (name), \
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#str, "HAS_CPU_FEATURE (" #name ")");
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static int
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do_test (int argc, char **argv)
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{
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int fails = 0;
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#if __GNUC_PREREQ (11, 0)
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fails += CHECK_SUPPORTS (adx, ADX);
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#endif
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#if __GNUC_PREREQ (6, 0)
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fails += CHECK_SUPPORTS (aes, AES);
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#endif
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#if __GNUC_PREREQ (11, 1)
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fails += CHECK_SUPPORTS (amx_bf16, AMX_BF16);
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fails += CHECK_SUPPORTS (amx_int8, AMX_INT8);
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fails += CHECK_SUPPORTS (amx_tile, AMX_TILE);
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#endif
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fails += CHECK_SUPPORTS (avx, AVX);
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fails += CHECK_SUPPORTS (avx2, AVX2);
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#if __GNUC_PREREQ (7, 0)
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fails += CHECK_SUPPORTS (avx5124fmaps, AVX512_4FMAPS);
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fails += CHECK_SUPPORTS (avx5124vnniw, AVX512_4VNNIW);
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#endif
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#if __GNUC_PREREQ (10, 0)
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fails += CHECK_SUPPORTS (avx512bf16, AVX512_BF16);
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#endif
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#if __GNUC_PREREQ (8, 0)
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fails += CHECK_SUPPORTS (avx512bitalg, AVX512_BITALG);
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#endif
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#if __GNUC_PREREQ (6, 0)
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fails += CHECK_SUPPORTS (avx512ifma, AVX512_IFMA);
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fails += CHECK_SUPPORTS (avx512vbmi, AVX512_VBMI);
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#endif
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#if __GNUC_PREREQ (8, 0)
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fails += CHECK_SUPPORTS (avx512vbmi2, AVX512_VBMI2);
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fails += CHECK_SUPPORTS (avx512vnni, AVX512_VNNI);
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#endif
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#if __GNUC_PREREQ (10, 0)
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fails += CHECK_SUPPORTS (avx512vp2intersect, AVX512_VP2INTERSECT);
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#endif
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#if __GNUC_PREREQ (7, 0)
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fails += CHECK_SUPPORTS (avx512vpopcntdq, AVX512_VPOPCNTDQ);
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#endif
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#if __GNUC_PREREQ (6, 0)
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fails += CHECK_SUPPORTS (avx512bw, AVX512BW);
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fails += CHECK_SUPPORTS (avx512cd, AVX512CD);
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fails += CHECK_SUPPORTS (avx512er, AVX512ER);
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fails += CHECK_SUPPORTS (avx512dq, AVX512DQ);
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#endif
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#if __GNUC_PREREQ (5, 0)
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fails += CHECK_SUPPORTS (avx512f, AVX512F);
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#endif
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#if __GNUC_PREREQ (6, 0)
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fails += CHECK_SUPPORTS (avx512pf, AVX512PF);
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fails += CHECK_SUPPORTS (avx512vl, AVX512VL);
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#endif
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#if __GNUC_PREREQ (5, 0)
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fails += CHECK_SUPPORTS (bmi, BMI1);
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fails += CHECK_SUPPORTS (bmi2, BMI2);
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#endif
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#if __GNUC_PREREQ (11, 0)
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fails += CHECK_SUPPORTS (cldemote, CLDEMOTE);
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fails += CHECK_SUPPORTS (clflushopt, CLFLUSHOPT);
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fails += CHECK_SUPPORTS (clwb, CLWB);
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#endif
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fails += CHECK_SUPPORTS (cmov, CMOV);
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#if __GNUC_PREREQ (11, 0)
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fails += CHECK_SUPPORTS (cmpxchg16b, CMPXCHG16B);
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fails += CHECK_SUPPORTS (cmpxchg8b, CX8);
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fails += CHECK_SUPPORTS (enqcmd, ENQCMD);
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fails += CHECK_SUPPORTS (f16c, F16C);
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#endif
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#if __GNUC_PREREQ (4, 9)
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fails += CHECK_SUPPORTS (fma, FMA);
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fails += CHECK_SUPPORTS (fma4, FMA4);
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#endif
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#if __GNUC_PREREQ (11, 0)
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fails += CHECK_SUPPORTS (fsgsbase, FSGSBASE);
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fails += CHECK_SUPPORTS (fxsave, FXSR);
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#endif
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#if __GNUC_PREREQ (8, 0)
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fails += CHECK_SUPPORTS (gfni, GFNI);
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#endif
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#if __GNUC_PREREQ (11, 0)
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fails += CHECK_SUPPORTS (hle, HLE);
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fails += CHECK_SUPPORTS (ibt, IBT);
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fails += CHECK_SUPPORTS (lahf_lm, LAHF64_SAHF64);
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fails += CHECK_SUPPORTS (lm, LM);
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fails += CHECK_SUPPORTS (lwp, LWP);
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fails += CHECK_SUPPORTS (lzcnt, LZCNT);
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#endif
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fails += CHECK_SUPPORTS (mmx, MMX);
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#if __GNUC_PREREQ (11, 0)
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fails += CHECK_SUPPORTS (movbe, MOVBE);
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fails += CHECK_SUPPORTS (movdiri, MOVDIRI);
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fails += CHECK_SUPPORTS (movdir64b, MOVDIR64B);
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fails += CHECK_SUPPORTS (osxsave, OSXSAVE);
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fails += CHECK_SUPPORTS (pconfig, PCONFIG);
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fails += CHECK_SUPPORTS (pku, PKU);
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#endif
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fails += CHECK_SUPPORTS (popcnt, POPCNT);
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#if __GNUC_PREREQ (11, 0)
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fails += CHECK_SUPPORTS (prefetchwt1, PREFETCHWT1);
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fails += CHECK_SUPPORTS (rdpid, RDPID);
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fails += CHECK_SUPPORTS (rdrnd, RDRAND);
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fails += CHECK_SUPPORTS (rdseed, RDSEED);
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fails += CHECK_SUPPORTS (rtm, RTM);
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fails += CHECK_SUPPORTS (serialize, SERIALIZE);
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fails += CHECK_SUPPORTS (sha, SHA);
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fails += CHECK_SUPPORTS (shstk, SHSTK);
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#endif
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fails += CHECK_SUPPORTS (sse, SSE);
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fails += CHECK_SUPPORTS (sse2, SSE2);
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fails += CHECK_SUPPORTS (sse3, SSE3);
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fails += CHECK_SUPPORTS (sse4.1, SSE4_1);
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fails += CHECK_SUPPORTS (sse4.2, SSE4_2);
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#if __GNUC_PREREQ (4, 9)
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fails += CHECK_SUPPORTS (sse4a, SSE4A);
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#endif
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fails += CHECK_SUPPORTS (ssse3, SSSE3);
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#if __GNUC_PREREQ (11, 0)
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fails += CHECK_SUPPORTS (tbm, TBM);
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fails += CHECK_SUPPORTS (tsxldtrk, TSXLDTRK);
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fails += CHECK_SUPPORTS (vaes, VAES);
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#endif
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#if __GNUC_PREREQ (8, 0)
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fails += CHECK_SUPPORTS (vpclmulqdq, VPCLMULQDQ);
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#endif
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#if __GNUC_PREREQ (11, 0)
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fails += CHECK_SUPPORTS (waitpkg, WAITPKG);
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fails += CHECK_SUPPORTS (wbnoinvd, WBNOINVD);
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#endif
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#if __GNUC_PREREQ (4, 9)
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fails += CHECK_SUPPORTS (xop, XOP);
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#endif
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#if __GNUC_PREREQ (11, 0)
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fails += CHECK_SUPPORTS (xsave, XSAVE);
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fails += CHECK_SUPPORTS (xsavec, XSAVEC);
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fails += CHECK_SUPPORTS (xsaveopt, XSAVEOPT);
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fails += CHECK_SUPPORTS (xsaves, XSAVES);
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#endif
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printf ("%d differences between __builtin_cpu_supports and glibc code.\n",
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fails);
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return (fails != 0);
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}
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#include "../../../test-skeleton.c"
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