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Hello, This patch is just i386-update of the x86_64-version that we recently provided to GLIBC. So it totally works in SSE, and only epilogue moves result from SSE to FPU, but without explicit rounding of the result to single precision and hence does not degrade accuracy of functions that depend on it, including complex single precision functions. Performance on main path [-87;87] in cycles: Istanbul, Atom, Nehalem, AVX Current __expf_finite: 79.20 326.29 98.05 99.05 Current __ieee754_expf: 70.69 293.30 91.38 94.76 New __expf_finite: 64.29 145.14 42.31 35.95 New __ieee754_expf: 51.83 113.14 34.12 30.24 Testing passed for new expf with our proprietary test system that tests on many intervals with different steps, checks for special values (from ISO C) and corner cases. Test using “make check” from GLIBC did not show new fails. ChangeLog: 2012-04-02 Liubov Dmitrieva <liubov.dmitrieva@gmail.com> * sysdeps/i386/fpu/multiarch/: New folder. * sysdeps/i386/fpu/multiarch/init-arch.c: New file. * sysdeps/i386/fpu/multiarch/init-arch.h: New file. * sysdeps/i386/fpu/multiarch/ifunc-defines.sym: New file. * sysdeps/i386/fpu/multiarch/Makefile: New file. * sysdeps/i386/fpu/multiarch/e_expf.S: New file. * sysdeps/i386/fpu/multiarch/e_expf-sse2.S: New file. -- Liubov Dmitrieva Intel Corporation
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