llvm/utils/UpdateTestChecks/asm.py

   1 from __future__ import print_function
   2 import re
   3 import sys
   4
   5 from . import common
   6
   7 if sys.version_info[0] > 2:
   8   class string:
   9     expandtabs = str.expandtabs
  10 else:
  11   import string
  12
  13 # RegEx: this is where the magic happens.
  14
  15 ##### Assembly parser
  16
  17 ASM_FUNCTION_X86_RE = re.compile(
  18     r'^_?(?P<func>[^:]+):[ \t]*#+[ \t]*(@"?(?P=func)"?| -- Begin function (?P=func))\n(?:\s*\.?Lfunc_begin[^:\n]*:\n)?'
  19     r'(?:\.L[^$]+\$local:\n)?'      # drop .L<func>$local:
  20     r'(?:[ \t]+.cfi_startproc\n|.seh_proc[^\n]+\n)?'  # drop optional cfi
  21     r'(?P<body>^##?[ \t]+[^:]+:.*?)\s*'
  22     r'^\s*(?:[^:\n]+?:\s*\n\s*\.size|\.cfi_endproc|\.globl|\.comm|\.(?:sub)?section|#+ -- End function)',
  23     flags=(re.M | re.S))
  24
  25 ASM_FUNCTION_ARM_RE = re.compile(
  26         r'^(?P<func>[0-9a-zA-Z_]+):\n' # f: (name of function)
  27         r'\s+\.fnstart\n' # .fnstart
  28         r'(?P<body>.*?)\n' # (body of the function)
  29         r'.Lfunc_end[0-9]+:', # .Lfunc_end0: or # -- End function
  30         flags=(re.M | re.S))
  31
  32 ASM_FUNCTION_AARCH64_RE = re.compile(
  33      r'^_?(?P<func>[^:]+):[ \t]*\/\/[ \t]*@"?(?P=func)"?( (Function|Tail Call))?\n'
  34      r'(?:[ \t]+.cfi_startproc\n)?'  # drop optional cfi noise
  35      r'(?P<body>.*?)\n'
  36      # This list is incomplete
  37      r'.Lfunc_end[0-9]+:\n',
  38      flags=(re.M | re.S))
  39
  40 ASM_FUNCTION_AMDGPU_RE = re.compile(
  41     r'^_?(?P<func>[^:]+):[ \t]*;+[ \t]*@"?(?P=func)"?\n[^:]*?'
  42     r'(?P<body>.*?)\n' # (body of the function)
  43     # This list is incomplete
  44     r'^\s*(\.Lfunc_end[0-9]+:\n|\.section)',
  45     flags=(re.M | re.S))
  46
  47 ASM_FUNCTION_HEXAGON_RE = re.compile(
  48     r'^_?(?P<func>[^:]+):[ \t]*//[ \t]*@"?(?P=func)"?\n[^:]*?'
  49     r'(?P<body>.*?)\n' # (body of the function)
  50     # This list is incomplete
  51     r'.Lfunc_end[0-9]+:\n',
  52     flags=(re.M | re.S))
  53
  54 ASM_FUNCTION_M68K_RE = re.compile(
  55     r'^_?(?P<func>[^:]+):[ \t]*;[ \t]*@"?(?P=func)"?\n'
  56     r'(?P<body>.*?)\s*' # (body of the function)
  57     r'.Lfunc_end[0-9]+:\n',
  58     flags=(re.M | re.S))
  59
  60 ASM_FUNCTION_MIPS_RE = re.compile(
  61     r'^_?(?P<func>[^:]+):[ \t]*#+[ \t]*@"?(?P=func)"?\n[^:]*?' # f: (name of func)
  62     r'(?:^[ \t]+\.(frame|f?mask|set).*?\n)+'  # Mips+LLVM standard asm prologue
  63     r'(?P<body>.*?)\n'                        # (body of the function)
  64     # Mips+LLVM standard asm epilogue
  65     r'(?:(^[ \t]+\.set[^\n]*?\n)*^[ \t]+\.end.*?\n)'
  66     r'(\$|\.L)func_end[0-9]+:\n',             # $func_end0: (mips32 - O32) or
  67                                               # .Lfunc_end0: (mips64 - NewABI)
  68     flags=(re.M | re.S))
  69
  70 ASM_FUNCTION_MSP430_RE = re.compile(
  71     r'^_?(?P<func>[^:]+):[ \t]*;+[ \t]*@"?(?P=func)"?\n[^:]*?'
  72     r'(?P<body>.*?)\n'
  73     r'(\$|\.L)func_end[0-9]+:\n',             # $func_end0:
  74     flags=(re.M | re.S))
  75
  76 ASM_FUNCTION_AVR_RE = re.compile(
  77     r'^_?(?P<func>[^:]+):[ \t]*;+[ \t]*@"?(?P=func)"?\n[^:]*?'
  78     r'(?P<body>.*?)\n'
  79     r'.Lfunc_end[0-9]+:\n',
  80     flags=(re.M | re.S))
  81
  82 ASM_FUNCTION_PPC_RE = re.compile(
  83     r'#[ \-\t]*Begin function (?P<func>[^.:]+)\n'
  84     r'.*?'
  85     r'^[_.]?(?P=func):(?:[ \t]*#+[ \t]*@"?(?P=func)"?)?\n'
  86     r'(?:^[^#]*\n)*'
  87     r'(?P<body>.*?)\n'
  88     # This list is incomplete
  89     r'(?:^[ \t]*(?:\.(?:long|quad|v?byte)[ \t]+[^\n]+)\n)*'
  90     r'(?:\.Lfunc_end|L\.\.(?P=func))[0-9]+:\n',
  91     flags=(re.M | re.S))
  92
  93 ASM_FUNCTION_RISCV_RE = re.compile(
  94     r'^_?(?P<func>[^:]+):[ \t]*#+[ \t]*@"?(?P=func)"?\n'
  95     r'(?:\s*\.?L(?P=func)\$local:\n)?'  # optional .L<func>$local: due to -fno-semantic-interposition
  96     r'(?:\s*\.?Lfunc_begin[^:\n]*:\n)?[^:]*?'
  97     r'(?P<body>^##?[ \t]+[^:]+:.*?)\s*'
  98     r'.Lfunc_end[0-9]+:\n',
  99     flags=(re.M | re.S))
 100
 101 ASM_FUNCTION_LANAI_RE = re.compile(
 102     r'^_?(?P<func>[^:]+):[ \t]*!+[ \t]*@"?(?P=func)"?\n'
 103     r'(?:[ \t]+.cfi_startproc\n)?'  # drop optional cfi noise
 104     r'(?P<body>.*?)\s*'
 105     r'.Lfunc_end[0-9]+:\n',
 106     flags=(re.M | re.S))
 107
 108 ASM_FUNCTION_SPARC_RE = re.compile(
 109     r'^_?(?P<func>[^:]+):[ \t]*!+[ \t]*@"?(?P=func)"?\n'
 110     r'(?P<body>.*?)\s*'
 111     r'.Lfunc_end[0-9]+:\n',
 112     flags=(re.M | re.S))
 113
 114 ASM_FUNCTION_SYSTEMZ_RE = re.compile(
 115     r'^_?(?P<func>[^:]+):[ \t]*#+[ \t]*@"?(?P=func)"?\n'
 116     r'[ \t]+.cfi_startproc\n'
 117     r'(?P<body>.*?)\n'
 118     r'.Lfunc_end[0-9]+:\n',
 119     flags=(re.M | re.S))
 120
 121 ASM_FUNCTION_AARCH64_DARWIN_RE = re.compile(
 122      r'^_(?P<func>[^:]+):[ \t]*;[ \t]@"?(?P=func)"?\n'
 123      r'([ \t]*.cfi_startproc\n[\s]*)?'
 124      r'(?P<body>.*?)'
 125      r'([ \t]*.cfi_endproc\n[\s]*)?'
 126      r'^[ \t]*;[ \t]--[ \t]End[ \t]function',
 127      flags=(re.M | re.S))
 128
 129 ASM_FUNCTION_ARM_DARWIN_RE = re.compile(
 130      r'^[ \t]*\.globl[ \t]*_(?P<func>[^ \t])[ \t]*@[ \t]--[ \t]Begin[ \t]function[ \t]"?(?P=func)"?'
 131      r'(?P<directives>.*?)'
 132      r'^_(?P=func):\n[ \t]*'
 133      r'(?P<body>.*?)'
 134      r'^[ \t]*@[ \t]--[ \t]End[ \t]function',
 135      flags=(re.M | re.S ))
 136
 137 ASM_FUNCTION_ARM_MACHO_RE = re.compile(
 138      r'^_(?P<func>[^:]+):[ \t]*\n'
 139      r'([ \t]*.cfi_startproc\n[ \t]*)?'
 140      r'(?P<body>.*?)\n'
 141      r'[ \t]*\.cfi_endproc\n',
 142      flags=(re.M | re.S))
 143
 144 ASM_FUNCTION_THUMBS_DARWIN_RE = re.compile(
 145      r'^_(?P<func>[^:]+):\n'
 146      r'(?P<body>.*?)\n'
 147      r'[ \t]*\.data_region\n',
 148      flags=(re.M | re.S))
 149
 150 ASM_FUNCTION_THUMB_DARWIN_RE = re.compile(
 151      r'^_(?P<func>[^:]+):\n'
 152      r'(?P<body>.*?)\n'
 153      r'^[ \t]*@[ \t]--[ \t]End[ \t]function',
 154      flags=(re.M | re.S))
 155
 156 ASM_FUNCTION_ARM_IOS_RE = re.compile(
 157      r'^_(?P<func>[^:]+):\n'
 158      r'(?P<body>.*?)'
 159      r'^[ \t]*@[ \t]--[ \t]End[ \t]function',
 160      flags=(re.M | re.S))
 161
 162 ASM_FUNCTION_WASM32_RE = re.compile(
 163     r'^_?(?P<func>[^:]+):[ \t]*#+[ \t]*@"?(?P=func)"?\n'
 164     r'(?P<body>.*?)\n'
 165     r'^\s*(\.Lfunc_end[0-9]+:\n|end_function)',
 166     flags=(re.M | re.S))
 167
 168 SCRUB_X86_SHUFFLES_RE = (
 169     re.compile(
 170         r'^(\s*\w+) [^#\n]+#+ ((?:[xyz]mm\d+|mem)( \{%k\d+\}( \{z\})?)? = .*)$',
 171         flags=re.M))
 172
 173 SCRUB_X86_SHUFFLES_NO_MEM_RE = (
 174     re.compile(
 175         r'^(\s*\w+) [^#\n]+#+ ((?:[xyz]mm\d+|mem)( \{%k\d+\}( \{z\})?)? = (?!.*(?:mem)).*)$',
 176         flags=re.M))
 177
 178 SCRUB_X86_SPILL_RELOAD_RE = (
 179     re.compile(
 180         r'-?\d+\(%([er])[sb]p\)(.*(?:Spill|Reload))$',
 181         flags=re.M))
 182 SCRUB_X86_SP_RE = re.compile(r'\d+\(%(esp|rsp)\)')
 183 SCRUB_X86_RIP_RE = re.compile(r'[.\w]+\(%rip\)')
 184 SCRUB_X86_LCP_RE = re.compile(r'\.?LCPI[0-9]+_[0-9]+')
 185 SCRUB_X86_RET_RE = re.compile(r'ret[l|q]')
 186
 187 def scrub_asm_x86(asm, args):
 188   # Scrub runs of whitespace out of the assembly, but leave the leading
 189   # whitespace in place.
 190   asm = common.SCRUB_WHITESPACE_RE.sub(r' ', asm)
 191   # Expand the tabs used for indentation.
 192   asm = string.expandtabs(asm, 2)
 193
 194   # Detect shuffle asm comments and hide the operands in favor of the comments.
 195   if getattr(args, 'no_x86_scrub_mem_shuffle', True):
 196     asm = SCRUB_X86_SHUFFLES_NO_MEM_RE.sub(r'\1 {{.*#+}} \2', asm)
 197   else:
 198     asm = SCRUB_X86_SHUFFLES_RE.sub(r'\1 {{.*#+}} \2', asm)
 199
 200   # Detect stack spills and reloads and hide their exact offset and whether
 201   # they used the stack pointer or frame pointer.
 202   asm = SCRUB_X86_SPILL_RELOAD_RE.sub(r'{{[-0-9]+}}(%\1{{[sb]}}p)\2', asm)
 203   if getattr(args, 'x86_scrub_sp', True):
 204     # Generically match the stack offset of a memory operand.
 205     asm = SCRUB_X86_SP_RE.sub(r'{{[0-9]+}}(%\1)', asm)
 206   if getattr(args, 'x86_scrub_rip', False):
 207     # Generically match a RIP-relative memory operand.
 208     asm = SCRUB_X86_RIP_RE.sub(r'{{.*}}(%rip)', asm)
 209   # Generically match a LCP symbol.
 210   asm = SCRUB_X86_LCP_RE.sub(r'{{\.?LCPI[0-9]+_[0-9]+}}', asm)
 211   if getattr(args, 'extra_scrub', False):
 212     # Avoid generating different checks for 32- and 64-bit because of 'retl' vs 'retq'.
 213     asm = SCRUB_X86_RET_RE.sub(r'ret{{[l|q]}}', asm)
 214   # Strip kill operands inserted into the asm.
 215   asm = common.SCRUB_KILL_COMMENT_RE.sub('', asm)
 216   # Strip trailing whitespace.
 217   asm = common.SCRUB_TRAILING_WHITESPACE_RE.sub(r'', asm)
 218   return asm
 219
 220 def scrub_asm_amdgpu(asm, args):
 221   # Scrub runs of whitespace out of the assembly, but leave the leading
 222   # whitespace in place.
 223   asm = common.SCRUB_WHITESPACE_RE.sub(r' ', asm)
 224   # Expand the tabs used for indentation.
 225   asm = string.expandtabs(asm, 2)
 226   # Strip trailing whitespace.
 227   asm = common.SCRUB_TRAILING_WHITESPACE_RE.sub(r'', asm)
 228   return asm
 229
 230 def scrub_asm_arm_eabi(asm, args):
 231   # Scrub runs of whitespace out of the assembly, but leave the leading
 232   # whitespace in place.
 233   asm = common.SCRUB_WHITESPACE_RE.sub(r' ', asm)
 234   # Expand the tabs used for indentation.
 235   asm = string.expandtabs(asm, 2)
 236   # Strip kill operands inserted into the asm.
 237   asm = common.SCRUB_KILL_COMMENT_RE.sub('', asm)
 238   # Strip trailing whitespace.
 239   asm = common.SCRUB_TRAILING_WHITESPACE_RE.sub(r'', asm)
 240   return asm
 241
 242 def scrub_asm_hexagon(asm, args):
 243   # Scrub runs of whitespace out of the assembly, but leave the leading
 244   # whitespace in place.
 245   asm = common.SCRUB_WHITESPACE_RE.sub(r' ', asm)
 246   # Expand the tabs used for indentation.
 247   asm = string.expandtabs(asm, 2)
 248   # Strip trailing whitespace.
 249   asm = common.SCRUB_TRAILING_WHITESPACE_RE.sub(r'', asm)
 250   return asm
 251
 252 def scrub_asm_powerpc(asm, args):
 253   # Scrub runs of whitespace out of the assembly, but leave the leading
 254   # whitespace in place.
 255   asm = common.SCRUB_WHITESPACE_RE.sub(r' ', asm)
 256   # Expand the tabs used for indentation.
 257   asm = string.expandtabs(asm, 2)
 258   # Strip unimportant comments, but leave the token '#' in place.
 259   asm = common.SCRUB_LOOP_COMMENT_RE.sub(r'#', asm)
 260   # Strip trailing whitespace.
 261   asm = common.SCRUB_TRAILING_WHITESPACE_RE.sub(r'', asm)
 262   # Strip the tailing token '#', except the line only has token '#'.
 263   asm = common.SCRUB_TAILING_COMMENT_TOKEN_RE.sub(r'', asm)
 264   return asm
 265
 266 def scrub_asm_m68k(asm, args):
 267   # Scrub runs of whitespace out of the assembly, but leave the leading
 268   # whitespace in place.
 269   asm = common.SCRUB_WHITESPACE_RE.sub(r' ', asm)
 270   # Expand the tabs used for indentation.
 271   asm = string.expandtabs(asm, 2)
 272   # Strip trailing whitespace.
 273   asm = common.SCRUB_TRAILING_WHITESPACE_RE.sub(r'', asm)
 274   return asm
 275
 276 def scrub_asm_mips(asm, args):
 277   # Scrub runs of whitespace out of the assembly, but leave the leading
 278   # whitespace in place.
 279   asm = common.SCRUB_WHITESPACE_RE.sub(r' ', asm)
 280   # Expand the tabs used for indentation.
 281   asm = string.expandtabs(asm, 2)
 282   # Strip trailing whitespace.
 283   asm = common.SCRUB_TRAILING_WHITESPACE_RE.sub(r'', asm)
 284   return asm
 285
 286 def scrub_asm_msp430(asm, args):
 287   # Scrub runs of whitespace out of the assembly, but leave the leading
 288   # whitespace in place.
 289   asm = common.SCRUB_WHITESPACE_RE.sub(r' ', asm)
 290   # Expand the tabs used for indentation.
 291   asm = string.expandtabs(asm, 2)
 292   # Strip trailing whitespace.
 293   asm = common.SCRUB_TRAILING_WHITESPACE_RE.sub(r'', asm)
 294   return asm
 295
 296 def scrub_asm_avr(asm, args):
 297   # Scrub runs of whitespace out of the assembly, but leave the leading
 298   # whitespace in place.
 299   asm = common.SCRUB_WHITESPACE_RE.sub(r' ', asm)
 300   # Expand the tabs used for indentation.
 301   asm = string.expandtabs(asm, 2)
 302   # Strip trailing whitespace.
 303   asm = common.SCRUB_TRAILING_WHITESPACE_RE.sub(r'', asm)
 304   return asm
 305
 306 def scrub_asm_riscv(asm, args):
 307   # Scrub runs of whitespace out of the assembly, but leave the leading
 308   # whitespace in place.
 309   asm = common.SCRUB_WHITESPACE_RE.sub(r' ', asm)
 310   # Expand the tabs used for indentation.
 311   asm = string.expandtabs(asm, 2)
 312   # Strip trailing whitespace.
 313   asm = common.SCRUB_TRAILING_WHITESPACE_RE.sub(r'', asm)
 314   return asm
 315
 316 def scrub_asm_lanai(asm, args):
 317   # Scrub runs of whitespace out of the assembly, but leave the leading
 318   # whitespace in place.
 319   asm = common.SCRUB_WHITESPACE_RE.sub(r' ', asm)
 320   # Expand the tabs used for indentation.
 321   asm = string.expandtabs(asm, 2)
 322   # Strip trailing whitespace.
 323   asm = common.SCRUB_TRAILING_WHITESPACE_RE.sub(r'', asm)
 324   return asm
 325
 326 def scrub_asm_sparc(asm, args):
 327   # Scrub runs of whitespace out of the assembly, but leave the leading
 328   # whitespace in place.
 329   asm = common.SCRUB_WHITESPACE_RE.sub(r' ', asm)
 330   # Expand the tabs used for indentation.
 331   asm = string.expandtabs(asm, 2)
 332   # Strip trailing whitespace.
 333   asm = common.SCRUB_TRAILING_WHITESPACE_RE.sub(r'', asm)
 334   return asm
 335
 336 def scrub_asm_systemz(asm, args):
 337   # Scrub runs of whitespace out of the assembly, but leave the leading
 338   # whitespace in place.
 339   asm = common.SCRUB_WHITESPACE_RE.sub(r' ', asm)
 340   # Expand the tabs used for indentation.
 341   asm = string.expandtabs(asm, 2)
 342   # Strip trailing whitespace.
 343   asm = common.SCRUB_TRAILING_WHITESPACE_RE.sub(r'', asm)
 344   return asm
 345
 346 def scrub_asm_wasm32(asm, args):
 347   # Scrub runs of whitespace out of the assembly, but leave the leading
 348   # whitespace in place.
 349   asm = common.SCRUB_WHITESPACE_RE.sub(r' ', asm)
 350   # Expand the tabs used for indentation.
 351   asm = string.expandtabs(asm, 2)
 352   # Strip trailing whitespace.
 353   asm = common.SCRUB_TRAILING_WHITESPACE_RE.sub(r'', asm)
 354   return asm
 355
 356 def get_triple_from_march(march):
 357   triples = {
 358       'amdgcn': 'amdgcn',
 359       'r600': 'r600',
 360       'mips': 'mips',
 361       'sparc': 'sparc',
 362       'hexagon': 'hexagon',
 363   }
 364   for prefix, triple in triples.items():
 365     if march.startswith(prefix):
 366       return triple
 367   print("Cannot find a triple. Assume 'x86'", file=sys.stderr)
 368   return 'x86'
 369
 370 def get_run_handler(triple):
 371   target_handlers = {
 372       'i686': (scrub_asm_x86, ASM_FUNCTION_X86_RE),
 373       'x86': (scrub_asm_x86, ASM_FUNCTION_X86_RE),
 374       'i386': (scrub_asm_x86, ASM_FUNCTION_X86_RE),
 375       'arm64_32-apple-ios': (scrub_asm_arm_eabi, ASM_FUNCTION_AARCH64_DARWIN_RE),
 376       'aarch64': (scrub_asm_arm_eabi, ASM_FUNCTION_AARCH64_RE),
 377       'aarch64-apple-darwin': (scrub_asm_arm_eabi, ASM_FUNCTION_AARCH64_DARWIN_RE),
 378       'aarch64-apple-ios': (scrub_asm_arm_eabi, ASM_FUNCTION_AARCH64_DARWIN_RE),
 379       'hexagon': (scrub_asm_hexagon, ASM_FUNCTION_HEXAGON_RE),
 380       'r600': (scrub_asm_amdgpu, ASM_FUNCTION_AMDGPU_RE),
 381       'amdgcn': (scrub_asm_amdgpu, ASM_FUNCTION_AMDGPU_RE),
 382       'arm': (scrub_asm_arm_eabi, ASM_FUNCTION_ARM_RE),
 383       'arm64': (scrub_asm_arm_eabi, ASM_FUNCTION_AARCH64_RE),
 384       'arm64e': (scrub_asm_arm_eabi, ASM_FUNCTION_AARCH64_DARWIN_RE),
 385       'arm64-apple-ios': (scrub_asm_arm_eabi, ASM_FUNCTION_AARCH64_DARWIN_RE),
 386       'armv7-apple-ios' : (scrub_asm_arm_eabi, ASM_FUNCTION_ARM_IOS_RE),
 387       'armv7-apple-darwin': (scrub_asm_arm_eabi, ASM_FUNCTION_ARM_DARWIN_RE),
 388       'thumb': (scrub_asm_arm_eabi, ASM_FUNCTION_ARM_RE),
 389       'thumb-macho': (scrub_asm_arm_eabi, ASM_FUNCTION_ARM_MACHO_RE),
 390       'thumbv5-macho': (scrub_asm_arm_eabi, ASM_FUNCTION_ARM_MACHO_RE),
 391       'thumbv7s-apple-darwin' : (scrub_asm_arm_eabi, ASM_FUNCTION_THUMBS_DARWIN_RE),
 392       'thumbv7-apple-darwin' : (scrub_asm_arm_eabi, ASM_FUNCTION_THUMB_DARWIN_RE),
 393       'thumbv7-apple-ios' : (scrub_asm_arm_eabi, ASM_FUNCTION_ARM_IOS_RE),
 394       'm68k': (scrub_asm_m68k, ASM_FUNCTION_M68K_RE),
 395       'mips': (scrub_asm_mips, ASM_FUNCTION_MIPS_RE),
 396       'msp430': (scrub_asm_msp430, ASM_FUNCTION_MSP430_RE),
 397       'avr': (scrub_asm_avr, ASM_FUNCTION_AVR_RE),
 398       'ppc32': (scrub_asm_powerpc, ASM_FUNCTION_PPC_RE),
 399       'powerpc': (scrub_asm_powerpc, ASM_FUNCTION_PPC_RE),
 400       'riscv32': (scrub_asm_riscv, ASM_FUNCTION_RISCV_RE),
 401       'riscv64': (scrub_asm_riscv, ASM_FUNCTION_RISCV_RE),
 402       'lanai': (scrub_asm_lanai, ASM_FUNCTION_LANAI_RE),
 403       'sparc': (scrub_asm_sparc, ASM_FUNCTION_SPARC_RE),
 404       's390x': (scrub_asm_systemz, ASM_FUNCTION_SYSTEMZ_RE),
 405       'wasm32': (scrub_asm_wasm32, ASM_FUNCTION_WASM32_RE),
 406   }
 407   handler = None
 408   best_prefix = ''
 409   for prefix, s in target_handlers.items():
 410     if triple.startswith(prefix) and len(prefix) > len(best_prefix):
 411       handler = s
 412       best_prefix = prefix
 413
 414   if handler is None:
 415     raise KeyError('Triple %r is not supported' % (triple))
 416
 417   return handler
 418
 419 ##### Generator of assembly CHECK lines
 420
 421 def add_asm_checks(output_lines, comment_marker, prefix_list, func_dict, func_name):
 422   # Label format is based on ASM string.
 423   check_label_format = '{} %s-LABEL: %s%s:'.format(comment_marker)
 424   global_vars_seen_dict = {}
 425   common.add_checks(output_lines, comment_marker, prefix_list, func_dict, func_name, check_label_format, True, False, global_vars_seen_dict)