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The optimized i386 version is faster than the generic one, and gcc implements it through the builtin. This optimization enables us to migrate the implementation to a C version. The performance on a Zen3 chip is similar to the SVID one. The m68k provided an optimized version through __m81_u(remainderf) (mathimpl.h), and gcc does not implement it through a builtin (different than i386). Performance improves a bit on x86_64 (Zen3, gcc 15.2.1): reciprocal-throughput input master NO-SVID improvement x86_64 subnormals 17.5349 15.6125 10.96% x86_64 normal 53.8134 52.5754 2.30% x86_64 close-exponent 20.0211 18.6656 6.77% i686 subnormals 21.8105 20.1856 7.45% i686 normal 73.1945 71.2199 2.70% i686 close-exponent 22.2141 20.331 8.48% Tested on x86_64-linux-gnu and i686-linux-gnu. Reviewed-by: Wilco Dijkstra <Wilco.Dijkstra@arm.com>