- Allow Source/DestAM with 8/16bit modes where this is profitable

[r15906]

[r15905]

[r15902]

[r15901]

[r15900]

[r15899]

[r15898]

[r15897]

- fixed wrong condition in iropt.c

[r15896]

Add a reassoc_running flag used to disable some local optimizations only while reassoc is running (to prevent endless loops)

[r15895]

[r15894]

[r15893]

[r15891]

[r15890]

[r15889]

[r15888]

[r15887]

[r15886]

[r15885]

[r15884]

- Change ~(x - 1) -> -x to ~(x + -1) -> -x, because the former pattern is always changed into the latter pattern.
 - Also only allow this transformation with two's complement arithmetics.

[r15883]

[r15882]

[r15881]

[r15880]

[r15879]

[r15878]

[r15877]

[r15876]

[r15875]

[r15874]

[r15873]

[r15872]

[r15871]

[r15870]

[r15869]

Treat the lower word of lowered 64bit operations always as unsigned. Using the same signedness as the high word is wrong (for example x < 0).

[r15868]

[r15867]

[r15866]

[r15865]

[r15864]