Optimize select of constants that differ by one.

[bagel99]

// The following code could be better optimized.

long len2; long foo1() { if (len2 < 0) return 5; return 6; }

long foo2() { if (len2 < 0) return 6; return 5; }

Currently produces: foo1: ldd r1,[ip,len2] cmp r1,r1,#0 sra r1,r1,<1:4> mov r2,#5 mux r1,r1,r2,#6 ret foo2: ldd r1,[ip,len2] cmp r1,r1,#0 sra r1,r1,<1:4> mov r2,#6 mux r1,r1,r2,#5 ret

Better code would be: foo1: ldd r1,[ip,len2] sra r1,r1,<0:63> add r1,r1,#6 ret foo2: ldd r1,[ip,len2] srl r1,r1,<0:63> add r1,r1,#5 ret

[bagel99]

TFixed with latest commit e3acd0a206118b47b3ed8ee7f99740f9b32e7e83