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1 ;; Command-line options for the C-SKY back end.
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2 ;; Copyright (C) 2018 Free Software Foundation, Inc.
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3 ;; Contributed by C-SKY Microsystems and Mentor Graphics.
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4 ;;
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5 ;; This file is part of GCC.
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6 ;;
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7 ;; GCC is free software; you can redistribute it and/or modify it under
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8 ;; the terms of the GNU General Public License as published by the Free
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9 ;; Software Foundation; either version 3, or (at your option) any later
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10 ;; version.
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11 ;;
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12 ;; GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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13 ;; WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 ;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 ;; for more details.
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16 ;;
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17 ;; You should have received a copy of the GNU General Public License
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18 ;; along with GCC; see the file COPYING3. If not see
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19 ;; <http://www.gnu.org/licenses/>.
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20
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21
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22 HeaderInclude
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23 config/csky/csky_opts.h
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24
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25 ;; Architecture/CPU options.
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26 ;; Normal CPU and arch enums are loaded from csky_tables.opt.
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27
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28 ; For backward compatibility only.
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29 march=ck803s
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30 Target Report Var(flag_arch_ck803s) Undocumented
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31
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32 march=
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33 Target RejectNegative ToLower Joined Enum(csky_arch) Var(csky_arch_option) Save
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34 Specify the target architecture.
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35
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36 mcpu=
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37 Target RejectNegative ToLower Joined Enum(csky_processor_type) Var(csky_cpu_option) Init(TARGET_CPU_csky_none) Save
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38 Specify the target processor.
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39
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40 ;; Endianness options.
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41
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42 mbig-endian
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43 Target RejectNegative Report Mask(BIG_ENDIAN)
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44 Generate big-endian code.
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45
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46 EB
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47 Target RejectNegative Report Alias(mbig-endian) Undocumented
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48
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49 mlittle-endian
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50 Target RejectNegative Report InverseMask(BIG_ENDIAN)
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51 Generate little-endian code.
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52
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53 EL
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54 Target RejectNegative Report Alias(mlittle-endian) Undocumented
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55
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56 ;; Floating point options. These affect code generation but not
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57 ;; assembly.
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58
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59 mhard-float
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60 Target Report RejectNegative Mask(HARD_FLOAT)
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61 Enable hardware floating-point instructions.
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62
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63 msoft-float
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64 Target Report RejectNegative InverseMask(HARD_FLOAT)
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65 Use library calls to perform floating-point operations (default).
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66
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67 mfpu=
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68 Target RejectNegative Joined Enum(csky_fpu) Var(csky_fpu_index) Init(TARGET_FPU_auto) Save
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69 Specify the target floating-point hardware/format.
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70
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71 mdouble-float
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72 Target Report Var(TARGET_DOUBLE_FLOAT) Init(-1)
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73 Generate C-SKY FPU double float instructions (default for hard float).
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74
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75 mfdivdu
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76 Target Report Var(TARGET_FDIVDU) Init(-1)
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77 Generate frecipd/fsqrtd/fdivd instructions (default for hard float).
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78
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79 ;; Instruction set extensions. Most of these don't affect code
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80 ;; generation, and are passed through to the assembler.
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81 ;; There are builtin preprocessor defines for each of these.
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82
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83 melrw
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84 Target Report Var(TARGET_ELRW) Init(-1)
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85 Enable the extended LRW instruction (default for CK801).
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86
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87 mistack
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88 Target Report Mask(ISTACK)
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89 Enable interrupt stack instructions.
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90
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91 mmp
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92 Target Report RejectNegative Mask(MP)
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93 Enable multiprocessor instructions.
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94
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95 mcp
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96 Target Report RejectNegative Mask(CP)
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97 Enable coprocessor instructions.
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98
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99 mcache
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100 Target Report RejectNegative Mask(CACHE)
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101 Enable cache prefetch instructions.
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102
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103 msecurity
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104 Target Report RejectNegative Mask(SECURITY)
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105 Enable C-SKY SECURE instructions.
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106
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107 mmac
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108 Target Report RejectNegative Alias(msecurity) Undocumented
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109
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110 mtrust
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111 Target Report RejectNegative Mask(TRUST)
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112 Enable C-SKY TRUST instructions.
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113
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114 mdsp
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115 Target Report RejectNegative Var(TARGET_DSP)
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116 Enable C-SKY DSP instructions.
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117
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118 medsp
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119 Target Report RejectNegative Mask(EDSP)
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120 Enable C-SKY Enhanced DSP instructions.
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121
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122 mvdsp
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123 Target Report RejectNegative Mask(VDSP)
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124 Enable C-SKY Vector DSP instructions.
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125
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126 ;; Code generation options not passed to the assembler.
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127
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128 mdiv
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129 Target Report Var(TARGET_DIV) Init(-1)
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130 Generate divide instructions.
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131
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132 msmart
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133 Target Report Var(TARGET_MINI_REGISTERS) Init(-1)
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134 Generate code for Smart Mode.
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135
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136 mhigh-registers
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137 Target Report Var(TARGET_HIGH_REGISTERS) Init(-1)
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138 Enable use of R16-R31 (default).
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139
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140 manchor
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141 Target Report Var(TARGET_ANCHOR)
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142 Generate code using global anchor symbol addresses.
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143
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144 mpushpop
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145 Target Report Var(TARGET_PUSHPOP) Init(1)
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146 Generate push/pop instructions (default).
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147
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148 mmultiple-stld
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149 Target Report Var(TARGET_MULTIPLE_STLD) Init(-1)
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150 Generate stm/ldm instructions (default).
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151
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152 mstm
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153 Target Report Alias(mmultiple-stld) Undocumented
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154
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155 mconstpool
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156 Target Report Var(TARGET_CONSTANT_POOL) Init(-1)
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157 Generate constant pools in the compiler instead of assembler.
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158
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159 mstack-size
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160 Target Report Var(TARGET_STACK_SIZE) Init(0)
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161 Emit .stack_size directives.
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162
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163 mccrt
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164 Target Report Var(TARGET_LIBCCRT) Init(0)
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165 Generate code for C-SKY compiler runtime instead of libgcc.
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166
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167 mbranch-cost=
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168 Target Report Joined RejectNegative UInteger Var(csky_branch_cost) Init(1)
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169 Set the branch costs to roughly the specified number of instructions.
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170
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171 msched-prolog
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172 Target Report Var(flag_sched_prolog) Init(0)
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173 Permit scheduling of function prologue and epilogue sequences.
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