Nils Pipenbrinck <[EMAIL PROTECTED]> writes: > Since the codebase is huge I have the feeling that I have overlooked > something. Does some kind of infrastructure to detect patterns within > a SSA tree already exists somewhere else?
FWIW some time ago I wanted to do some other arithmetic optimization on expressions and didn't find a nice generic "misc transformation pass" or an generic pattern matcher. Probably one would need to be added. > Where would be the best > place in gcc to add an automatic byteswap detection? GCC has multiple ILs: higher level gimpel and low level RTL. The high level is usually architecture neutral (with only some exceptions), so you would either need to do the optimization in a way that it benefits all targets, or parametrize it somehow based on the backend. Low level RTL is machine specific, but you need to care about a lot more things and have to test on different targets because the input varies. -Andi
