Paul Brook <[EMAIL PROTECTED]> writes: > In m68k.md we have: > > ;; Speed up pushing a single byte but leaving four bytes of space. > > (define_peephole > [(set (mem:QI (pre_dec:SI (reg:SI SP_REG))) > (match_operand:QI 1 "general_operand" "dami")) > (set (reg:SI SP_REG) (minus:SI (reg:SI SP_REG) (const_int 2)))] > > > The (const_int 2) looks very suspect. Shouldn't this be (const_int 3) ? > If not, could someone please explain to me what bit of arcane magic I'm > missing?
Pushing a byte will actually push a word, i.e "move.b x,-(%sp)" modifies %sp by two, not one. Andreas. -- Andreas Schwab, SuSE Labs, [EMAIL PROTECTED] SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany PGP key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5 "And now for something completely different."
