Gabriel Paubert <paubert@xxxxxxx> writes: > On Fri, Jul 03, 2009 at 10:57:12PM +0200, Andreas Schwab wrote: >> The 'Z' constraint is required for a memory operand for insns that don't >> have an update form (which would be selected by the %U modifier). > > Hmmm, I believed that it was for instructions that only have an indexed > form (all Altivec, byte reverse, and l?arx/st?cx for atomic operations). > > Of course none of these instructions have an update form, but they don't > have an offset encoded in the instruction either. Yes, you are right. IIRC there are either all u/x/ux forms or only the x form. Andreas. -- Andreas Schwab, schwab@xxxxxxxxxxxxxx GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5 "And now for something completely different."
