Ruby with this feature turned on. For the (somewhat
contrived/synthetic) scenario below, it looks like compiling
with profile guided optimization turned on, along with -O3,
results in about a 9% speed increase vs. -O3 alone.
YMMV. I compiled a version of Ruby-1.8.4 using the
following config options…
configure CFLAGS="-O3 -fprofile-generate"
Odd, I thought Ruby died a horrible death if compiled with -O3. Has
that changed with gcc 4.x?
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