2695850994
(add/sub): Correct predicates and constraints for sNaddX and addX insns; we can use sNsubX and subX to add small negative constants. Don't split addition to SP since we want to update it just once. (beq, bne): Use subtract, not compare for ints; it's more efficient. (define_split for comparisons): Always prefer add/sub if it will work. (probe_stack, allocate_stack): New patterns. From-SVN: r4078