Richard Biener <richard.guent...@gmail.com> writes: > On Mon, Jan 22, 2018 at 6:55 PM, Richard Sandiford > <richard.sandif...@linaro.org> wrote: >> vect_float is true for arm*-*-* targets, but the support is only >> available when -funsafe-math-optimizations is on. This caused >> failures in two tests that disable fast-math. >> >> The easiest fix seemed to be to add a new target selector for >> "vect_float without special options". >> >> Tested on aarch64-linux-gnu, x86_64-linux-gnu and powerpc64le-linux-gnu. >> OK to install? > > Ok - so arm float vectors are not IEEE compliant?
Not for subnormals apparently: ; Note that NEON operations don't support the full IEEE 754 standard: in ; particular, denormal values are flushed to zero. This means that GCC cannot ; use those instructions for autovectorization, etc. unless ; -funsafe-math-optimizations is in effect (in which case flush-to-zero ; behavior is permissible). Thanks, Richard
