Adjustments to pcmp instruction generation avoid pcmpe insns when not valuable
For pure in and equality comparisions, xor is better,
Xor is a one cycle insn as pcmp.
Pattern insns will still be used when you need to
conditionally set something to one or zero, e.g
if (a)
return 1;
else
return 0;
Define contraint for first operand in insn matching
fcmp as general register
Add a constraint to the cstoresf pattern forcing the use of
general regs for the operands. This avoids an ICE where the
compiler would crash on late usage of pseudo registers.
Changelog
2013-02-11 Edgar E. Iglesias <edgar.igles...@gmail.com>
* config/microblaze/microblaze.c (microblaze_emit_compare):
Use xor for EQ/NE comparisions
* config/microblaze/microblaze.md (cstoresf4): Add constraints
(cbranchsf4): Adjust operator to comparison_operator
0009-microblaze-Adjustments-to-pcmp-instruction-generatio.patch
Description: 0009-microblaze-Adjustments-to-pcmp-instruction-generatio.patch
