aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/x86_64/multiarch/init-arch.c
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/x86_64/multiarch/init-arch.c')
-rw-r--r--sysdeps/x86_64/multiarch/init-arch.c223
1 files changed, 0 insertions, 223 deletions
diff --git a/sysdeps/x86_64/multiarch/init-arch.c b/sysdeps/x86_64/multiarch/init-arch.c
deleted file mode 100644
index aaad5fa841..0000000000
--- a/sysdeps/x86_64/multiarch/init-arch.c
+++ /dev/null
@@ -1,223 +0,0 @@
-/* Initialize CPU feature data.
- This file is part of the GNU C Library.
- Copyright (C) 2008-2015 Free Software Foundation, Inc.
- Contributed by Ulrich Drepper <drepper@redhat.com>.
-
- 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
- <http://www.gnu.org/licenses/>. */
-
-#include <atomic.h>
-#include <cpuid.h>
-#include "init-arch.h"
-
-
-struct cpu_features __cpu_features attribute_hidden;
-
-
-static void
-get_common_indeces (unsigned int *family, unsigned int *model)
-{
- __cpuid (1, __cpu_features.cpuid[COMMON_CPUID_INDEX_1].eax,
- __cpu_features.cpuid[COMMON_CPUID_INDEX_1].ebx,
- __cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx,
- __cpu_features.cpuid[COMMON_CPUID_INDEX_1].edx);
-
- unsigned int eax = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].eax;
- *family = (eax >> 8) & 0x0f;
- *model = (eax >> 4) & 0x0f;
-}
-
-
-void
-__init_cpu_features (void)
-{
- unsigned int ebx;
- unsigned int ecx;
- unsigned int edx;
- unsigned int family = 0;
- unsigned int model = 0;
- enum cpu_features_kind kind;
-
- __cpuid (0, __cpu_features.max_cpuid, ebx, ecx, edx);
-
- /* This spells out "GenuineIntel". */
- if (ebx == 0x756e6547 && ecx == 0x6c65746e && edx == 0x49656e69)
- {
- kind = arch_kind_intel;
-
- get_common_indeces (&family, &model);
-
- unsigned int eax = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].eax;
- unsigned int extended_family = (eax >> 20) & 0xff;
- unsigned int extended_model = (eax >> 12) & 0xf0;
- if (family == 0x0f)
- {
- family += extended_family;
- model += extended_model;
- }
- else if (family == 0x06)
- {
- ecx = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx;
- model += extended_model;
- switch (model)
- {
- case 0x1c:
- case 0x26:
- /* BSF is slow on Atom. */
- __cpu_features.feature[index_Slow_BSF] |= bit_Slow_BSF;
- break;
-
- case 0x37:
- case 0x4a:
- case 0x4d:
- case 0x5a:
- case 0x5d:
- /* Unaligned load versions are faster than SSSE3
- on Silvermont. */
-#if index_Fast_Unaligned_Load != index_Prefer_PMINUB_for_stringop
-# error index_Fast_Unaligned_Load != index_Prefer_PMINUB_for_stringop
-#endif
-#if index_Fast_Unaligned_Load != index_Slow_SSE4_2
-# error index_Fast_Unaligned_Load != index_Slow_SSE4_2
-#endif
- __cpu_features.feature[index_Fast_Unaligned_Load]
- |= (bit_Fast_Unaligned_Load
- | bit_Prefer_PMINUB_for_stringop
- | bit_Slow_SSE4_2);
- break;
-
- default:
- /* Unknown family 0x06 processors. Assuming this is one
- of Core i3/i5/i7 processors if AVX is available. */
- if ((ecx & bit_AVX) == 0)
- break;
-
- case 0x1a:
- case 0x1e:
- case 0x1f:
- case 0x25:
- case 0x2c:
- case 0x2e:
- case 0x2f:
- /* Rep string instructions, copy backward, unaligned loads
- and pminub are fast on Intel Core i3, i5 and i7. */
-#if index_Fast_Rep_String != index_Fast_Copy_Backward
-# error index_Fast_Rep_String != index_Fast_Copy_Backward
-#endif
-#if index_Fast_Rep_String != index_Fast_Unaligned_Load
-# error index_Fast_Rep_String != index_Fast_Unaligned_Load
-#endif
-#if index_Fast_Rep_String != index_Prefer_PMINUB_for_stringop
-# error index_Fast_Rep_String != index_Prefer_PMINUB_for_stringop
-#endif
- __cpu_features.feature[index_Fast_Rep_String]
- |= (bit_Fast_Rep_String
- | bit_Fast_Copy_Backward
- | bit_Fast_Unaligned_Load
- | bit_Prefer_PMINUB_for_stringop);
- break;
- }
- }
- }
- /* This spells out "AuthenticAMD". */
- else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65)
- {
- kind = arch_kind_amd;
-
- get_common_indeces (&family, &model);
-
- ecx = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx;
-
- unsigned int eax;
- __cpuid (0x80000000, eax, ebx, ecx, edx);
- if (eax >= 0x80000001)
- __cpuid (0x80000001,
- __cpu_features.cpuid[COMMON_CPUID_INDEX_80000001].eax,
- __cpu_features.cpuid[COMMON_CPUID_INDEX_80000001].ebx,
- __cpu_features.cpuid[COMMON_CPUID_INDEX_80000001].ecx,
- __cpu_features.cpuid[COMMON_CPUID_INDEX_80000001].edx);
- }
- else
- kind = arch_kind_other;
-
- if (__cpu_features.max_cpuid >= 7)
- __cpuid_count (7, 0,
- __cpu_features.cpuid[COMMON_CPUID_INDEX_7].eax,
- __cpu_features.cpuid[COMMON_CPUID_INDEX_7].ebx,
- __cpu_features.cpuid[COMMON_CPUID_INDEX_7].ecx,
- __cpu_features.cpuid[COMMON_CPUID_INDEX_7].edx);
-
- /* Can we call xgetbv? */
- if (CPUID_OSXSAVE)
- {
- unsigned int xcrlow;
- unsigned int xcrhigh;
- asm ("xgetbv" : "=a" (xcrlow), "=d" (xcrhigh) : "c" (0));
- /* Is YMM and XMM state usable? */
- if ((xcrlow & (bit_YMM_state | bit_XMM_state)) ==
- (bit_YMM_state | bit_XMM_state))
- {
- /* Determine if AVX is usable. */
- if (CPUID_AVX)
- __cpu_features.feature[index_AVX_Usable] |= bit_AVX_Usable;
-#if index_AVX2_Usable != index_AVX_Fast_Unaligned_Load
-# error index_AVX2_Usable != index_AVX_Fast_Unaligned_Load
-#endif
- /* Determine if AVX2 is usable. Unaligned load with 256-bit
- AVX registers are faster on processors with AVX2. */
- if (CPUID_AVX2)
- __cpu_features.feature[index_AVX2_Usable]
- |= bit_AVX2_Usable | bit_AVX_Fast_Unaligned_Load;
- /* Check if OPMASK state, upper 256-bit of ZMM0-ZMM15 and
- ZMM16-ZMM31 state are enabled. */
- if ((xcrlow & (bit_Opmask_state | bit_ZMM0_15_state
- | bit_ZMM16_31_state)) ==
- (bit_Opmask_state | bit_ZMM0_15_state | bit_ZMM16_31_state))
- {
- /* Determine if AVX512F is usable. */
- if (CPUID_AVX512F)
- {
- __cpu_features.feature[index_AVX512F_Usable]
- |= bit_AVX512F_Usable;
- /* Determine if AVX512DQ is usable. */
- if (CPUID_AVX512DQ)
- __cpu_features.feature[index_AVX512DQ_Usable]
- |= bit_AVX512DQ_Usable;
- }
- }
- /* Determine if FMA is usable. */
- if (CPUID_FMA)
- __cpu_features.feature[index_FMA_Usable] |= bit_FMA_Usable;
- /* Determine if FMA4 is usable. */
- if (CPUID_FMA4)
- __cpu_features.feature[index_FMA4_Usable] |= bit_FMA4_Usable;
- }
- }
-
- __cpu_features.family = family;
- __cpu_features.model = model;
- atomic_write_barrier ();
- __cpu_features.kind = kind;
-}
-
-#undef __get_cpu_features
-
-const struct cpu_features *
-__get_cpu_features (void)
-{
- if (__cpu_features.kind == arch_kind_unknown)
- __init_cpu_features ();
-
- return &__cpu_features;
-}
generated by cgit v1.2.3-70-g09d2 (git 2.48.1) at 2025-02-19 01:35:23 +0000