s390.opt revision 1.11
1; Options for the S/390 / zSeries port of the compiler. 2 3; Copyright (C) 2005-2019 Free Software Foundation, Inc. 4; 5; This file is part of GCC. 6; 7; GCC is free software; you can redistribute it and/or modify it under 8; the terms of the GNU General Public License as published by the Free 9; Software Foundation; either version 3, or (at your option) any later 10; version. 11; 12; GCC is distributed in the hope that it will be useful, but WITHOUT ANY 13; WARRANTY; without even the implied warranty of MERCHANTABILITY or 14; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15; for more details. 16; 17; You should have received a copy of the GNU General Public License 18; along with GCC; see the file COPYING3. If not see 19; <http://www.gnu.org/licenses/>. 20 21HeaderInclude 22config/s390/s390-opts.h 23 24;; Definitions to add to the cl_target_option and gcc_options structures 25 26;; whether -march was specified 27TargetVariable 28unsigned char s390_arch_specified 29 30;; Flags derived from s390_arch 31TargetVariable 32int s390_arch_flags 33 34;; whether -mtune was specified 35TargetVariable 36unsigned char s390_tune_specified 37 38;; Flags derived from s390_tune 39TargetVariable 40int s390_tune_flags 41 42;; Cpu cost table (this is actually a "const struct processor_cost *") 43Variable 44long s390_cost_pointer 45 46m31 47Target Report RejectNegative Negative(m64) InverseMask(64BIT) 4831 bit ABI. 49 50m64 51Target Report RejectNegative Negative(m31) Mask(64BIT) 5264 bit ABI. 53 54march= 55Target RejectNegative Joined Enum(processor_type) Var(s390_arch) Init(PROCESSOR_max) Save 56Generate code for given CPU. 57 58Enum 59Name(processor_type) Type(enum processor_type) 60 61EnumValue 62Enum(processor_type) String(z900) Value(PROCESSOR_2064_Z900) 63 64EnumValue 65Enum(processor_type) String(arch5) Value(PROCESSOR_2064_Z900) 66 67EnumValue 68Enum(processor_type) String(z990) Value(PROCESSOR_2084_Z990) 69 70EnumValue 71Enum(processor_type) String(arch6) Value(PROCESSOR_2084_Z990) 72 73EnumValue 74Enum(processor_type) String(z9-109) Value(PROCESSOR_2094_Z9_109) 75 76EnumValue 77Enum(processor_type) String(z9-ec) Value(PROCESSOR_2094_Z9_EC) 78 79EnumValue 80Enum(processor_type) String(arch7) Value(PROCESSOR_2094_Z9_EC) 81 82EnumValue 83Enum(processor_type) String(z10) Value(PROCESSOR_2097_Z10) 84 85EnumValue 86Enum(processor_type) String(arch8) Value(PROCESSOR_2097_Z10) 87 88EnumValue 89Enum(processor_type) String(z196) Value(PROCESSOR_2817_Z196) 90 91EnumValue 92Enum(processor_type) String(arch9) Value(PROCESSOR_2817_Z196) 93 94EnumValue 95Enum(processor_type) String(zEC12) Value(PROCESSOR_2827_ZEC12) 96 97EnumValue 98Enum(processor_type) String(arch10) Value(PROCESSOR_2827_ZEC12) 99 100EnumValue 101Enum(processor_type) String(z13) Value(PROCESSOR_2964_Z13) 102 103EnumValue 104Enum(processor_type) String(arch11) Value(PROCESSOR_2964_Z13) 105 106EnumValue 107Enum(processor_type) String(z14) Value(PROCESSOR_3906_Z14) 108 109EnumValue 110Enum(processor_type) String(arch12) Value(PROCESSOR_3906_Z14) 111 112EnumValue 113Enum(processor_type) String(z15) Value(PROCESSOR_8561_Z15) 114 115EnumValue 116Enum(processor_type) String(arch13) Value(PROCESSOR_8561_Z15) 117 118EnumValue 119Enum(processor_type) String(native) Value(PROCESSOR_NATIVE) DriverOnly 120 121mbackchain 122Target Report Mask(BACKCHAIN) Save 123Maintain backchain pointer. 124 125mdebug 126Target Report Mask(DEBUG_ARG) Save 127Additional debug prints. 128 129mesa 130Target Report RejectNegative Negative(mzarch) InverseMask(ZARCH) 131ESA/390 architecture. 132 133mhard-dfp 134Target Report Mask(HARD_DFP) Save 135Enable decimal floating point hardware support. 136 137mhard-float 138Target Report RejectNegative Negative(msoft-float) InverseMask(SOFT_FLOAT, HARD_FLOAT) Save 139Enable hardware floating point. 140 141mhotpatch= 142Target RejectNegative Report Joined Var(s390_deferred_options) Defer 143Takes two non-negative integer numbers separated by a comma. 144Prepend the function label with the number of two-byte Nop 145instructions indicated by the first. Append Nop instructions 146covering the number of halfwords indicated by the second after the 147label. Nop instructions of the largest possible size are used 148(six, four or two bytes), beginning with the largest possible 149size. Using 0 for both values disables hotpatching. 150 151mlong-double-128 152Target Report RejectNegative Negative(mlong-double-64) Mask(LONG_DOUBLE_128) 153Use 128-bit long double. 154 155mlong-double-64 156Target Report RejectNegative Negative(mlong-double-128) InverseMask(LONG_DOUBLE_128) 157Use 64-bit long double. 158 159mhtm 160Target Report Mask(OPT_HTM) Save 161Use hardware transactional execution instructions. 162 163mvx 164Target Report Mask(OPT_VX) Save 165Use hardware vector facility instructions and enable the vector ABI. 166 167mpacked-stack 168Target Report Mask(PACKED_STACK) Save 169Use packed stack layout. 170 171msmall-exec 172Target Report Mask(SMALL_EXEC) Save 173Use bras for executable < 64k. 174 175msoft-float 176Target Report RejectNegative Negative(mhard-float) Mask(SOFT_FLOAT) Save 177Disable hardware floating point. 178 179mstack-guard= 180Target RejectNegative Negative(mno-stack-guard) Joined UInteger Var(s390_stack_guard) Save 181Set the max. number of bytes which has to be left to stack size before a trap instruction is triggered. 182 183mno-stack-guard 184Target RejectNegative Alias(mstack-guard=,0) Negative(mstack-guard=) 185Switches off the -mstack-guard= option. 186 187mstack-size= 188Target RejectNegative Joined UInteger Var(s390_stack_size) Save 189Emit extra code in the function prologue in order to trap if the stack size exceeds the given limit. 190 191mno-stack-size 192Target RejectNegative Alias(mstack-size=,0) Negative(mstack-size=) 193Switches off the -mstack-size= option. 194 195mtune= 196Target RejectNegative Joined Enum(processor_type) Var(s390_tune) Init(PROCESSOR_max) Save 197Schedule code for given CPU. 198 199mmvcle 200Target Report Mask(MVCLE) Save 201Use the mvcle instruction for block moves. 202 203mzvector 204Target Report Mask(ZVECTOR) Save 205Enable the z vector language extension providing the context-sensitive 206vector macro and enable the Altivec-style builtins in vecintrin.h. 207 208mwarn-dynamicstack 209Target Var(s390_warn_dynamicstack_p) Save 210Warn if a function uses alloca or creates an array with dynamic size. 211 212mwarn-framesize= 213Target RejectNegative Joined UInteger Var(s390_warn_framesize) Save 214Warn if a single function's framesize exceeds the given framesize. 215 216mzarch 217Target Report RejectNegative Negative(mesa) Mask(ZARCH) 218z/Architecture. 219 220mbranch-cost= 221Target Report Joined RejectNegative UInteger Var(s390_branch_cost) Init(1) Save 222Set the branch costs for conditional branch instructions. Reasonable 223values are small, non-negative integers. The default branch cost is 2241. 225 226mlra 227Target Report Var(s390_lra_flag) Init(1) Save 228Use LRA instead of reload. 229 230mpic-data-is-text-relative 231Target Report Var(s390_pic_data_is_text_relative) Init(TARGET_DEFAULT_PIC_DATA_IS_TEXT_RELATIVE) 232Assume data segments are relative to text segment. 233 234 235mindirect-branch= 236Target Report RejectNegative Joined Enum(indirect_branch) Var(s390_indirect_branch) Init(indirect_branch_keep) 237Wrap all indirect branches into execute in order to disable branch 238prediction. 239 240mindirect-branch-jump= 241Target Report RejectNegative Joined Enum(indirect_branch) Var(s390_indirect_branch_jump) Init(indirect_branch_keep) 242Wrap indirect table jumps and computed gotos into execute in order to 243disable branch prediction. Using thunk or thunk-extern with this 244option requires the thunks to be considered signal handlers to order to 245generate correct CFI. For environments where unwinding (e.g. for 246exceptions) is required please use thunk-inline instead. 247 248mindirect-branch-call= 249Target Report RejectNegative Joined Enum(indirect_branch) Var(s390_indirect_branch_call) Init(indirect_branch_keep) 250Wrap all indirect calls into execute in order to disable branch prediction. 251 252mfunction-return= 253Target Report RejectNegative Joined Enum(indirect_branch) Var(s390_function_return) Init(indirect_branch_keep) 254Wrap all indirect return branches into execute in order to disable branch 255prediction. 256 257mfunction-return-mem= 258Target Report RejectNegative Joined Enum(indirect_branch) Var(s390_function_return_mem) Init(indirect_branch_keep) 259Wrap indirect return branches into execute in order to disable branch 260prediction. This affects only branches where the return address is 261going to be restored from memory. 262 263mfunction-return-reg= 264Target Report RejectNegative Joined Enum(indirect_branch) Var(s390_function_return_reg) Init(indirect_branch_keep) 265Wrap indirect return branches into execute in order to disable branch 266prediction. This affects only branches where the return address 267doesn't need to be restored from memory. 268 269Enum 270Name(indirect_branch) Type(enum indirect_branch) 271Known indirect branch choices (for use with the -mindirect-branch=/-mfunction-return= options): 272 273EnumValue 274Enum(indirect_branch) String(keep) Value(indirect_branch_keep) 275 276EnumValue 277Enum(indirect_branch) String(thunk) Value(indirect_branch_thunk) 278 279EnumValue 280Enum(indirect_branch) String(thunk-inline) Value(indirect_branch_thunk_inline) 281 282EnumValue 283Enum(indirect_branch) String(thunk-extern) Value(indirect_branch_thunk_extern) 284 285mindirect-branch-table 286Target Report Var(s390_indirect_branch_table) Init(TARGET_DEFAULT_INDIRECT_BRANCH_TABLE) 287Generate sections .s390_indirect_jump, .s390_indirect_call, 288.s390_return_reg, and .s390_return_mem to contain the indirect branch 289locations which have been patched as part of using one of the 290-mindirect-branch* or -mfunction-return* options. The sections 291consist of an array of 32 bit elements. Each entry holds the offset 292from the entry to the patched location. 293 294mfentry 295Target Report Var(flag_fentry) 296Emit profiling counter call at function entry before prologue. The compiled 297code will require a 64-bit CPU and glibc 2.29 or newer to run. 298 299mrecord-mcount 300Target Report Var(flag_record_mcount) 301Generate __mcount_loc section with all _mcount and __fentry__ calls. 302 303mnop-mcount 304Target Report Var(flag_nop_mcount) 305Generate mcount/__fentry__ calls as nops. To activate they need to be 306patched in. 307