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https://sourceware.org/git/glibc.git
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58bcf7b71a
1. Remove sse2 instructions when using the avx512 or avx version.
2. Fixup some format nits in how the address offsets where aligned.
3. Use more space efficient instructions in the conditional AVX
restoral.
- vpcmpeqq -> vpcmpeqb
- cmp imm32, r; jz -> inc r; jz
4. Use `rep movsb` instead of `rep movsq`. The former is guranteed to
be fast with the ERMS flags, the latter is not. The latter also
wastes an instruction in size setup.
119 lines
3.6 KiB
ArmAsm
119 lines
3.6 KiB
ArmAsm
/* PLT trampolines. x86-64 version.
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Copyright (C) 2004-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 <config.h>
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#include <sysdep.h>
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#include <cpu-features-offsets.h>
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#include <link-defines.h>
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#include <isa-level.h>
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#ifndef DL_STACK_ALIGNMENT
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/* Due to GCC bug:
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066
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__tls_get_addr may be called with 8-byte stack alignment. Although
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this bug has been fixed in GCC 4.9.4, 5.3 and 6, we can't assume
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that stack will be always aligned at 16 bytes. We use unaligned
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16-byte move to load and store SSE registers, which has no penalty
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on modern processors if stack is 16-byte aligned. */
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# define DL_STACK_ALIGNMENT 8
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#endif
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/* True if _dl_runtime_resolve should align stack for STATE_SAVE or align
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stack to 16 bytes before calling _dl_fixup. */
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#define DL_RUNTIME_RESOLVE_REALIGN_STACK \
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(STATE_SAVE_ALIGNMENT > DL_STACK_ALIGNMENT \
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|| 16 > DL_STACK_ALIGNMENT)
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/* Area on stack to save and restore registers used for parameter
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passing when calling _dl_fixup. */
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#define REGISTER_SAVE_RAX 0
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#define REGISTER_SAVE_RCX (REGISTER_SAVE_RAX + 8)
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#define REGISTER_SAVE_RDX (REGISTER_SAVE_RCX + 8)
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#define REGISTER_SAVE_RSI (REGISTER_SAVE_RDX + 8)
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#define REGISTER_SAVE_RDI (REGISTER_SAVE_RSI + 8)
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#define REGISTER_SAVE_R8 (REGISTER_SAVE_RDI + 8)
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#define REGISTER_SAVE_R9 (REGISTER_SAVE_R8 + 8)
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#define RESTORE_AVX
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#define VEC_SIZE 64
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#define VMOVA vmovdqa64
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#define VEC(i) zmm##i
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#define _dl_runtime_profile _dl_runtime_profile_avx512
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# define SECTION(p) p##.evex512
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#include "dl-trampoline.h"
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#undef _dl_runtime_profile
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#undef VEC
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#undef VMOVA
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#undef VEC_SIZE
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#undef SECTION
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#if MINIMUM_X86_ISA_LEVEL <= AVX_X86_ISA_LEVEL
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# define VEC_SIZE 32
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# define VMOVA vmovdqa
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# define VEC(i) ymm##i
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# define SECTION(p) p##.avx
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# define _dl_runtime_profile _dl_runtime_profile_avx
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# include "dl-trampoline.h"
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# undef _dl_runtime_profile
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# undef VEC
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# undef VMOVA
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# undef VEC_SIZE
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# undef SECTION
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#endif
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#if MINIMUM_X86_ISA_LEVEL < AVX_X86_ISA_LEVEL
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/* movaps/movups is 1-byte shorter. */
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# define VEC_SIZE 16
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# define VMOVA movaps
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# define VEC(i) xmm##i
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# define _dl_runtime_profile _dl_runtime_profile_sse
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# undef RESTORE_AVX
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# include "dl-trampoline.h"
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# undef _dl_runtime_profile
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# undef VEC
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# undef VMOVA
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# undef VEC_SIZE
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# define USE_FXSAVE
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# define STATE_SAVE_ALIGNMENT 16
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# define _dl_runtime_resolve _dl_runtime_resolve_fxsave
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# include "dl-trampoline.h"
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# undef _dl_runtime_resolve
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# undef USE_FXSAVE
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# undef STATE_SAVE_ALIGNMENT
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#endif
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#define USE_XSAVE
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#define STATE_SAVE_ALIGNMENT 64
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#define _dl_runtime_resolve _dl_runtime_resolve_xsave
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#include "dl-trampoline.h"
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#undef _dl_runtime_resolve
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#undef USE_XSAVE
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#undef STATE_SAVE_ALIGNMENT
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#define USE_XSAVEC
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#define STATE_SAVE_ALIGNMENT 64
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#define _dl_runtime_resolve _dl_runtime_resolve_xsavec
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#include "dl-trampoline.h"
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#undef _dl_runtime_resolve
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#undef USE_XSAVEC
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#undef STATE_SAVE_ALIGNMENT
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