[thirdparty/glibc.git] / sysdeps / x86_64 / multiarch / ifunc-memset.h

/* Common definition for memset/memset_chk ifunc selections.
   All versions must be listed in ifunc-impl-list.c.
   Copyright (C) 2017-2023 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <init-arch.h>

extern __typeof (REDIRECT_NAME) OPTIMIZE (erms) attribute_hidden;

extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_unaligned)
  attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_unaligned_erms)
  attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_no_vzeroupper)
  attribute_hidden;

extern __typeof (REDIRECT_NAME) OPTIMIZE (evex_unaligned)
  attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (evex_unaligned_erms)
  attribute_hidden;

extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned) attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned_erms)
  attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned_rtm)
  attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned_erms_rtm)
  attribute_hidden;

extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned)
  attribute_hidden;
extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned_erms)
  attribute_hidden;

static inline void *
IFUNC_SELECTOR (void)
{
  const struct cpu_features *cpu_features = __get_cpu_features ();

  if (CPU_FEATURES_ARCH_P (cpu_features, Prefer_ERMS))
    return OPTIMIZE (erms);

  if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512F)
      && !CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_AVX512))
    {
      if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
	  && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
	  && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2))
	{
	  if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
	    return OPTIMIZE (avx512_unaligned_erms);

	  return OPTIMIZE (avx512_unaligned);
	}

      return OPTIMIZE (avx512_no_vzeroupper);
    }

  if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2))
    {
      if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
	  && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
	  && X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2))
	{
	  if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
	    return OPTIMIZE (evex_unaligned_erms);

	  return OPTIMIZE (evex_unaligned);
	}

      if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
	{
	  if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
	    return OPTIMIZE (avx2_unaligned_erms_rtm);

	  return OPTIMIZE (avx2_unaligned_rtm);
	}

      if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
				       Prefer_No_VZEROUPPER, !))
	{
	  if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
	    return OPTIMIZE (avx2_unaligned_erms);

	  return OPTIMIZE (avx2_unaligned);
	}
    }

  if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
    return OPTIMIZE (sse2_unaligned_erms);

  return OPTIMIZE (sse2_unaligned);
}
Commit	Line	Data
93e46f87 L	1	/* Common definition for memset/memset_chk ifunc selections.
93e46f87 L	2	All versions must be listed in ifunc-impl-list.c.
6d7e8eda	3	Copyright (C) 2017-2023 Free Software Foundation, Inc.
93e46f87 L	4	This file is part of the GNU C Library.
	5
	6	The GNU C Library is free software; you can redistribute it and/or
	7	modify it under the terms of the GNU Lesser General Public
	8	License as published by the Free Software Foundation; either
	9	version 2.1 of the License, or (at your option) any later version.
	10
	11	The GNU C Library is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	Lesser General Public License for more details.
	15
	16	You should have received a copy of the GNU Lesser General Public
	17	License along with the GNU C Library; if not, see
5a82c748	18	<https://www.gnu.org/licenses/>. */
93e46f87 L	19
	20	#include <init-arch.h>
	21
	22	extern __typeof (REDIRECT_NAME) OPTIMIZE (erms) attribute_hidden;
37ecc657 NG	23
37ecc657 NG	24	extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_unaligned)
93e46f87	25	attribute_hidden;
37ecc657 NG	26	extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_unaligned_erms)
	27	attribute_hidden;
	28	extern __typeof (REDIRECT_NAME) OPTIMIZE (avx512_no_vzeroupper)
	29	attribute_hidden;
	30
	31	extern __typeof (REDIRECT_NAME) OPTIMIZE (evex_unaligned)
	32	attribute_hidden;
	33	extern __typeof (REDIRECT_NAME) OPTIMIZE (evex_unaligned_erms)
93e46f87	34	attribute_hidden;
37ecc657	35
93e46f87 L	36	extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned) attribute_hidden;
	37	extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned_erms)
	38	attribute_hidden;
7ebba913 L	39	extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned_rtm)
	40	attribute_hidden;
	41	extern __typeof (REDIRECT_NAME) OPTIMIZE (avx2_unaligned_erms_rtm)
	42	attribute_hidden;
37ecc657 NG	43
37ecc657 NG	44	extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned)
93e46f87	45	attribute_hidden;
37ecc657	46	extern __typeof (REDIRECT_NAME) OPTIMIZE (sse2_unaligned_erms)
93e46f87 L	47	attribute_hidden;
	48
	49	static inline void *
	50	IFUNC_SELECTOR (void)
	51	{
37ecc657	52	const struct cpu_features *cpu_features = __get_cpu_features ();
93e46f87 L	53
	54	if (CPU_FEATURES_ARCH_P (cpu_features, Prefer_ERMS))
	55	return OPTIMIZE (erms);
	56
37ecc657	57	if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512F)
93e46f87 L	58	&& !CPU_FEATURES_ARCH_P (cpu_features, Prefer_No_AVX512))
93e46f87 L	59	{
37ecc657 NG	60	if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
	61	&& X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
	62	&& X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2))
4e2d8f35 L	63	{
	64	if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
	65	return OPTIMIZE (avx512_unaligned_erms);
93e46f87	66
4e2d8f35 L	67	return OPTIMIZE (avx512_unaligned);
4e2d8f35 L	68	}
93e46f87	69
4e2d8f35	70	return OPTIMIZE (avx512_no_vzeroupper);
93e46f87 L	71	}
93e46f87 L	72
37ecc657	73	if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX2))
93e46f87	74	{
37ecc657 NG	75	if (X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512VL)
	76	&& X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, AVX512BW)
	77	&& X86_ISA_CPU_FEATURE_USABLE_P (cpu_features, BMI2))
1b968b6b L	78	{
	79	if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
	80	return OPTIMIZE (evex_unaligned_erms);
	81
	82	return OPTIMIZE (evex_unaligned);
	83	}
	84
7ebba913 L	85	if (CPU_FEATURE_USABLE_P (cpu_features, RTM))
	86	{
	87	if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
	88	return OPTIMIZE (avx2_unaligned_erms_rtm);
	89
	90	return OPTIMIZE (avx2_unaligned_rtm);
	91	}
	92
37ecc657 NG	93	if (X86_ISA_CPU_FEATURES_ARCH_P (cpu_features,
37ecc657 NG	94	Prefer_No_VZEROUPPER, !))
1b968b6b L	95	{
	96	if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
	97	return OPTIMIZE (avx2_unaligned_erms);
	98
	99	return OPTIMIZE (avx2_unaligned);
	100	}
93e46f87 L	101	}
93e46f87 L	102
107e6a3c	103	if (CPU_FEATURE_USABLE_P (cpu_features, ERMS))
93e46f87 L	104	return OPTIMIZE (sse2_unaligned_erms);
	105
	106	return OPTIMIZE (sse2_unaligned);
	107	}