Hi all, This is an updated version of patch in https://gcc.gnu.org/ml/gcc-patches/2017-07/msg00409.html . It prevents optimization in presense of sNaNs (and qNaNs when comparison operator is > >= < <=) to preserve FP exceptions.
Note that I had to use -fsignaling-nans in pr57371-5.c test because by default this option is off and some existing patterns in match.pd happily optimize NaN comparisons, even with sNaNs (!). Bootstrapped and regtested on x64. Ok for trunk? -Y
pr57371-4.patch
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