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As mentioned in the PR, the addition of vec_addsubv2sf3 expander caused the testcase to be vectorized and no longer to use fma. The following patch adds new expanders so that it can be vectorized again with the alternating add/sub fma instructions. There is some bug on the slp cost computation side which causes it not to count some scalar multiplication costs, but I think the patch is desirable anyway before that is fixed and the testcase for now just uses -fvect-cost-model=unlimited. 2024-12-13 Jakub Jelinek <jakub@redhat.com> PR target/116979 * config/i386/mmx.md (vec_fmaddsubv2sf4, vec_fmsubaddv2sf4): New define_expand patterns. * gcc.target/i386/pr116979.c: New test.
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