On Fri, 15 Jun 2018, Jeff Law wrote: > And resolution on -fno-math-errno as the default. Setting errno can be > more expensive than people realize.
I don't think I saw any version of the -fno-math-errno patch proposal that included the testsuite updates I'd expect. Certainly gcc.dg/torture/pr68264.c tests libm functions setting errno and would need to use -fmath-errno explicitly, but it seems likely there are other tests involving built-in functions that in fact only test what they're intended to test given -fmath-errno; tests using libm functions without explicit -ffast-math / -fmath-errno / -fno-math-errno would need review (and there should be new tests for optimizations that are only valid given -fno-math-errno). -- Joseph S. Myers jos...@codesourcery.com
