On 3/6/2014 1:01 PM, Joseph S. Myers wrote:
On Thu, 6 Mar 2014, Ian Bolton wrote:
Hi there,
I see in common.opt that fp-contract=fast is the default for GCC.
But then it gets disabled in c-family/c-opts.c if you are using ISO C
(e.g. with -std=c99).
But surely if you have also specified -funsafe-math-optimizations then
it should flip it back onto fast?
That seems reasonable.
I do see an improvement in several benchmarks by use of fma when I
append -ffp-contract=fast after -std=c99
Thanks.
--
Tim Prince
