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This patch replaces i386 assembly versions of e_expf with generic
e_expf.c. For workload-spec2017.wrf, on Nehalem, it improves
performance by:
Before After Improvement
reciprocal-throughput 55.5724 40.2664 38%
latency 80.0687 60.8517 31%
On Skylake, it improves performance by:
Before After Improvement
reciprocal-throughput 62.4056 39.4188 58%
latency 85.5496 59.6377 43%
On IvyBridge with --disable-multi-arch, it improves performance by:
Before After Improvement
reciprocal-throughput 133.707 40.3778 231%
latency 149.191 63.2515 135%
* sysdeps/i386/fpu/e_exp2f_data.c: Removed.
* sysdeps/i386/fpu/e_expf.S: Likewise.
* sysdeps/i386/fpu/math_errf.c: Likewise.
* sysdeps/i386/fpu/w_expf.c: Likewise.
* sysdeps/i386/i686/fpu/multiarch/e_expf-ia32.S: Likewise.
* sysdeps/i386/i686/fpu/multiarch/e_expf-sse2.S: Likewise.
* sysdeps/i386/i686/fpu/multiarch/w_expf.c: Likewise.
* sysdeps/i386/fpu/libm-test-ulps: Updated for generic e_expf.c.
* sysdeps/i386/i686/fpu/multiarch/libm-test-ulps: Likewise.
* sysdeps/i386/i686/fpu/multiarch/Makefile (libm-sysdep_routines):
Remove e_expf-ia32.
(CFLAGS-e_expf-sse2.c): New.
* sysdeps/i386/i686/fpu/multiarch/e_expf-sse2.c: New file.
* sysdeps/i386/i686/fpu/multiarch/e_expf.c: Rewritten.
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