On Tue, 2011-07-12 at 11:50 -0500, William J. Schmidt wrote: > Ilya, thanks for posting this! This patch is useful also on powerpc64. > Applying it solved a performance degradation with bwaves due to loss of > reassociation somewhere between 4.5 and 4.6 (still tracking it down). > When we apply -ftree-reassoc-width=2 to bwaves, the more optimal code > generation returns.
On further investigation, this is improving the code generation but not reverting all of the performance loss. We'll open a bug on this one once we have it narrowed down a little further. Bill > > Bill >
