tree 66acc972bc03f5d47de4488f60c5fd786cbd7d27
parent 0aba1c7376ad325202f328211ab6dfcae94c7f2a
author Aurelien Jarno <aurelien@aurel32.net> 1347988356 +0200
committer Aurelien Jarno <aurelien@aurel32.net> 1348319421 +0200

tcg/optimize: optimize "op r, a, a => movi r, 0"

Now that it's possible to detect copies, we can optimize the case
the "op r, a, a => movi r, 0". This helps in the computation of
overflow flags when one of the two args is 0.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>