[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 #15 from bfriesen at simple dot dallas.tx.us 2012-07-18 20:42:22 UTC ---
Testing shows that using

-m64 -march=native -O2 -mfpmath=sse -frename-registers

is sufficient to restore good performance.