gcc/config/i386/i386-opts.h

   1 /* Definitions for option handling for IA-32.
   2    Copyright (C) 1988-2024 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  11 GCC 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
  14 GNU General Public License for more details.
  15
  16 Under Section 7 of GPL version 3, you are granted additional
  17 permissions described in the GCC Runtime Library Exception, version
  18 3.1, as published by the Free Software Foundation.
  19
  20 You should have received a copy of the GNU General Public License and
  21 a copy of the GCC Runtime Library Exception along with this program;
  22 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 <http://www.gnu.org/licenses/>.  */
  24
  25 #ifndef I386_OPTS_H
  26 #define I386_OPTS_H
  27
  28 /* Algorithm to expand string function with.  */
  29 enum stringop_alg
  30 {
  31 #undef DEF_ALG
  32 #define DEF_ALG(alg, name) alg,
  33
  34 #include "stringop.def"
  35 last_alg
  36
  37 #undef DEF_ALG
  38 };
  39
  40 /* Available call abi.  */
  41 enum calling_abi
  42 {
  43   SYSV_ABI = 0,
  44   MS_ABI = 1
  45 };
  46
  47 enum fpmath_unit
  48 {
  49   FPMATH_387 = 1,
  50   FPMATH_SSE = 2
  51 };
  52
  53 enum tls_dialect
  54 {
  55   TLS_DIALECT_GNU,
  56   TLS_DIALECT_GNU2,
  57   TLS_DIALECT_SUN
  58 };
  59
  60 enum cmodel {
  61   CM_32,        /* The traditional 32-bit ABI.  */
  62   CM_SMALL,     /* Assumes all code and data fits in the low 31 bits.  */
  63   CM_KERNEL,    /* Assumes all code and data fits in the high 31 bits.  */
  64   CM_MEDIUM,    /* Assumes code fits in the low 31 bits; data unlimited.  */
  65   CM_LARGE,     /* No assumptions.  */
  66   CM_SMALL_PIC, /* Assumes code+data+got/plt fits in a 31 bit region.  */
  67   CM_MEDIUM_PIC,/* Assumes code+got/plt fits in a 31 bit region.  */
  68   CM_LARGE_PIC  /* No assumptions.  */
  69 };
  70
  71 enum pmode {
  72   PMODE_SI,     /* Pmode == SImode. */
  73   PMODE_DI      /* Pmode == DImode. */
  74 };
  75
  76 enum ix86_align_data {
  77   ix86_align_data_type_compat,
  78   ix86_align_data_type_abi,
  79   ix86_align_data_type_cacheline
  80 };
  81
  82 enum asm_dialect {
  83   ASM_ATT,
  84   ASM_INTEL
  85 };
  86
  87 enum ix86_veclibabi {
  88   ix86_veclibabi_type_none,
  89   ix86_veclibabi_type_svml,
  90   ix86_veclibabi_type_acml
  91 };
  92
  93 enum stack_protector_guard {
  94   SSP_TLS,      /* per-thread canary in TLS block */
  95   SSP_GLOBAL    /* global canary */
  96 };
  97
  98 enum prefer_vector_width {
  99     PVW_NONE,
 100     PVW_AVX128,
 101     PVW_AVX256,
 102     PVW_AVX512
 103 };
 104
 105 /* This is used to mitigate variant #2 of the speculative execution
 106    vulnerabilities on x86 processors identified by CVE-2017-5715, aka
 107    Spectre.  They convert indirect branches and function returns to
 108    call and return thunks to avoid speculative execution via indirect
 109    call, jmp and ret.  */
 110 enum indirect_branch {
 111   indirect_branch_unset = 0,
 112   indirect_branch_keep,
 113   indirect_branch_thunk,
 114   indirect_branch_thunk_inline,
 115   indirect_branch_thunk_extern
 116 };
 117
 118 enum instrument_return {
 119   instrument_return_none = 0,
 120   instrument_return_call,
 121   instrument_return_nop5
 122 };
 123
 124 enum harden_sls {
 125   harden_sls_none = 0,
 126   harden_sls_return = 1 << 0,
 127   harden_sls_indirect_jmp = 1 << 1,
 128   harden_sls_all = harden_sls_return | harden_sls_indirect_jmp
 129 };
 130
 131 enum lam_type {
 132   lam_none = 0,
 133   lam_u48 = 1,
 134   lam_u57
 135 };
 136
 137 enum apx_features {
 138   apx_none = 0,
 139   apx_egpr = 1 << 0,
 140   apx_push2pop2 = 1 << 1,
 141   apx_ndd = 1 << 2,
 142   apx_ppx = 1 << 3,
 143   apx_nf = 1 << 4,
 144   apx_ccmp = 1 << 5,
 145   apx_zu = 1 << 6,
 146   apx_all = apx_egpr | apx_push2pop2 | apx_ndd
 147             | apx_ppx | apx_nf | apx_ccmp | apx_zu,
 148 };
 149
 150 #endif