[Bug target/53967] GCC produces slow code for convolution algorithm with -mfpmath=sse (the AMD_64 default)

[bfriesen at simple dot dallas.tx.us]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53967

--- Comment #16 from bfriesen at simple dot dallas.tx.us 2012-07-19 14:29:10 UTC ---
Is there a way that I can selectively apply the -frename-registers fix to
functions which benefit from it in order to work around the bug until the fix
is widely available?  I tried

#pragma GCC optimize ("O3,rename-registers")

and

#pragma GCC optimize ("rename-registers")

as well as the function attribute equivalent and there was no effect.  GCC
seems to ignore the request.

I did find another somewhat similar function which benefited significantly from
-frename-registers.