[Bug target/38402] New: Undocumented Yz constraint

[hjl dot tools at gmail dot com]

x86 has

;; We use the Y prefix to denote any number of conditional register sets:
;;  z   First SSE register.
;;  2   SSE2 enabled
;;  i   SSE2 inter-unit moves enabled
;;  m   MMX inter-unit moves enabled

Most of them are internal to gcc. But some instructions use the fixed XMM0
register. We may need the Yz constraint for asm statement. Shouldn't it
be documented?


-- 
           Summary: Undocumented Yz constraint
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: hjl dot tools at gmail dot com
GCC target triplet: x86-gnu-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38402