1 /* Common hooks for RISC-V. 2 Copyright (C) 1989-2014 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 You should have received a copy of the GNU General Public License 17 along with GCC; see the file COPYING3. If not see 18 <http://www.gnu.org/licenses/>. */ 19 20 #include "config.h" 21 #include "system.h" 22 #include "coretypes.h" 23 #include "tm.h" 24 #include "common/common-target.h" 25 #include "common/common-target-def.h" 26 #include "opts.h" 27 #include "flags.h" 28 #include "errors.h" 29 30 /* Parse a RISC-V ISA string into an option mask. */ 31 32 static void 33 riscv_parse_arch_string (const char *isa, int *flags) 34 { 35 const char *p = isa; 36 37 if (strncmp (p, "RV32", 4) == 0) 38 *flags |= MASK_32BIT, p += 4; 39 else if (strncmp (p, "RV64", 4) == 0) 40 *flags &= ~MASK_32BIT, p += 4; 41 42 if (*p++ != 'I') 43 { 44 error ("-march=%s: ISA strings must begin with I, RV32I, or RV64I", isa); 45 return; 46 } 47 48 *flags &= ~MASK_MULDIV; 49 if (*p == 'M') 50 *flags |= MASK_MULDIV, p++; 51 52 *flags &= ~MASK_ATOMIC; 53 if (*p == 'A') 54 *flags |= MASK_ATOMIC, p++; 55 56 *flags |= MASK_SOFT_FLOAT_ABI; 57 if (*p == 'F') 58 *flags &= ~MASK_SOFT_FLOAT_ABI, p++; 59 60 if (*p == 'D') 61 { 62 p++; 63 if (!TARGET_HARD_FLOAT) 64 { 65 error ("-march=%s: the D extension requires the F extension", isa); 66 return; 67 } 68 } 69 else if (TARGET_HARD_FLOAT) 70 { 71 error ("-march=%s: single-precision-only is not yet supported", isa); 72 return; 73 } 74 75 if (*p) 76 { 77 error ("-march=%s: unsupported ISA substring %s", isa, p); 78 return; 79 } 80 } 81 82 static int 83 riscv_flags_from_arch_string (const char *isa) 84 { 85 int flags = 0; 86 riscv_parse_arch_string (isa, &flags); 87 return flags; 88 } 89 90 /* Implement TARGET_HANDLE_OPTION. */ 91 92 static bool 93 riscv_handle_option (struct gcc_options *opts, 94 struct gcc_options *opts_set ATTRIBUTE_UNUSED, 95 const struct cl_decoded_option *decoded, 96 location_t loc ATTRIBUTE_UNUSED) 97 { 98 switch (decoded->opt_index) 99 { 100 case OPT_march_: 101 riscv_parse_arch_string (decoded->arg, &opts->x_target_flags); 102 return true; 103 104 default: 105 return true; 106 } 107 } 108 109 /* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */ 110 static const struct default_options riscv_option_optimization_table[] = 111 { 112 { OPT_LEVELS_1_PLUS, OPT_fsection_anchors, NULL, 1 }, 113 { OPT_LEVELS_1_PLUS, OPT_fomit_frame_pointer, NULL, 1 }, 114 { OPT_LEVELS_NONE, 0, NULL, 0 } 115 }; 116 117 #undef TARGET_OPTION_OPTIMIZATION_TABLE 118 #define TARGET_OPTION_OPTIMIZATION_TABLE riscv_option_optimization_table 119 120 #undef TARGET_DEFAULT_TARGET_FLAGS 121 #define TARGET_DEFAULT_TARGET_FLAGS \ 122 (TARGET_DEFAULT \ 123 | riscv_flags_from_arch_string (RISCV_ARCH_STRING_DEFAULT) \ 124 | (TARGET_64BIT_DEFAULT ? 0 : MASK_32BIT)) 125 126 #undef TARGET_HANDLE_OPTION 127 #define TARGET_HANDLE_OPTION riscv_handle_option 128 129 struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER; 130