* config/rs6000/rs6000.h (FIXED_SCRATCH): Use r0 as a scratch
register on SPE targets. Change documentation to reflect
reality.
* config/rs6000/rs6000.c (rs6000_conditional_register_usage):
Change FIXED_SCRATCH to 14 and document why we're keeping r14
out of the register allocation pool.
(rs6000_reg_live_or_pic_offset_p): New function.
(rs6000_emit_prologue): Move the actual saving of LR up to free
r0 for holding r11. Split saving of SPE 64-bit registers into
its own case. Ensure that offsets will always be in-range for
'evstdd' by using r11 as a scratch register to point at the start
of the SPE save area. Save r11 if necessary, as it is the static
chain register.
(rs6000_emit_epilogue): Split restoring of SPE 64-bit registers
into its own case. Ensure that offsets will always be in-range
for 'evldd' by using r11 as a scratch register to point at the
start of the SPE save area. Also adjust r11 when restoring
the stack pointer to compensate for pre-loading r11.
From-SVN: r125340
