the parisc constraints cannot be found in the Machine Constraints page:
http://gcc.gnu.org/onlinedocs/gcc-4.1.1/gcc/Machine-Constraints.html

from gcc/config/pa/:
#define REG_CLASS_FROM_LETTER(C) \
  ((C) == 'f' ? FP_REGS :                   \
   (C) == 'y' ? FPUPPER_REGS :                  \
   (C) == 'x' ? FP_REGS :                   \
   (C) == 'q' ? SHIFT_REGS :                    \
   (C) == 'a' ? R1_REGS :                   \
   (C) == 'Z' ? ALL_REGS : NO_REGS)


-- 
           Summary: parisc-specific asm constraints not documented
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: vapier at gentoo dot org
  GCC host triplet: hppa
GCC target triplet: hppa


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30760

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