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2013-12-14 H.J. Lu <hongjiu.lu@intel.com>
* combine.c (subst): Pass subreg byte to REG_CANNOT_CHANGE_MODE_P.
(simplify_set): Likewise.
* emit-rtl.c (validate_subreg): Likewise.
* recog.c (register_operand): Likewise.
* rtlanal.c (simplify_subreg_regno): Likewise.
* defaults.h (MAYBE_VECTOR_CLASS_P): New macro.
* hard-reg-set.h (CANNOT_CHANGE_MODE_CLASS_P): New macro.
(REG_CANNOT_CHANGE_MODE_P): Add SUBREG_BYTE and pass it to
CANNOT_CHANGE_MODE_CLASS_P.
* postreload.c (reload_cse_simplify_set): Pass subreg byte to
CANNOT_CHANGE_MODE_CLASS_P.
(reload_cse_simplify_operands): Likewise.
* reload.c (push_reload): Likewise.
* regcprop.c (mode_change_ok): Pass unknown subreg byte to
REG_CANNOT_CHANGE_MODE_P.
* reginfo.c (record_subregs_of_mode): Likewise.
* reload1.c (choose_reload_regs): Pass subreg byte to
REG_CANNOT_CHANGE_MODE_P.
(inherit_piecemeal_p): Pass unknown subreg byte to
REG_CANNOT_CHANGE_MODE_P.
* config/i386/i386.c (ix86_cannot_change_mode_class): Don't
check mode size.
* config/i386/i386.h (MAYBE_VECTOR_CLASS_P): New macro.
* doc/tm.texi.in: Document MAYBE_VECTOR_CLASS_P.
* doc/tm.texi: Regenerated.
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