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With overall string size presently just slightly over 20k, > even a 16-bit value would suffice. Use "unsigned int" for now, as > there's no good use we could presently make of the otherwise saved 16 > bits. > > For 64-bit builds this reduces table size by 6.25% (prior to the recent > ISA extension additions it would have been 12.5%), with a similar effect > on cache occupation of table entries accessed. For PIE builds of gas > this also reduces the number of base relocations quite a bit (obviously > independent of bitness). > --- > An alternative to introducing i386-mnem.h would of course be to put the > #define-s in i386-init.h. That would look like an abuse of the file to > me, but I'd be okay switching to such an approach. > > As to further shrinking mnem_off (to 16 bits): I'm intending to drop > i386_opcode_modifier as a separate struct, embedding the fields directly > in insn_template. i386_opcode_modifier presently using only 6 bits from > its 3rd word will allow to shrink insn_template by another word then. > (This would also benefit readabilty of tc-i386*.c, as all the uses of > "opcode_modifier." would go away. This would additionally reduce the > apparent discrepancy between e.g. opcode_modifier.opcode_space and > opcode_modifier.opcode_prefix vs base_opcode and extension_opcode.) And of course this is patch 2/8; I'm sorry for the typo. Jan