On Donnerstag, 10. Januar 2019 14:27:40 CET Matthias Kretz wrote: > On Donnerstag, 10. Januar 2019 11:39:56 CET Jakub Jelinek wrote: > > On Thu, Jan 10, 2019 at 10:46:14AM +0100, Dr. Matthias Kretz wrote: > > > _mm_fixupimm_ps(_mm_getexp_ps(x), x, _mm_set1_epi32(0x00550433), 0x00); > > > > I guess you could use > > _mm_mask_fixupimm_ps(_mm_getexp_ps(x), -1, x, _mm_set1_epi32(0x00550433), > > 0x00); because that one does allow you to specify the dest operand. > > Thanks. Actually _mm_getexp_ps produces the right answer already by itself. > I only meant to demonstrate the fixupimm usage (e.g. if you calculate a > trig function and then fix up for Annex F requirements). > > BTW, your idea does not work because GCC recognizes the full writemask and > simply produces the same as `_mm_fixupimm_ps(x, _mm_set1_epi32(0x00550433), > 0x00)`. See here: https://godbolt.org/z/-5Ql0f > > > But I agree it is just weird, the non-masked intrinsics don't take into > > account the 0b0000 cases anymore. > > To be precise, they still do, but they produce garbage (e.g. https:// > godbolt.org/z/f6u-GI).
I opened PR88794 to track the issue. -- ────────────────────────────────────────────────────────────────────────── Dr. Matthias Kretz https://kretzfamily.de GSI Helmholtzzentrum für Schwerionenforschung https://gsi.de SIMD easy and portable https://github.com/VcDevel/Vc ──────────────────────────────────────────────────────────────────────────
