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authorSzabolcs Nagy <szabolcs.nagy@arm.com>2017-09-04 17:53:47 +0100
committerSzabolcs Nagy <szabolcs.nagy@arm.com>2017-09-29 17:17:41 +0100
commit875c76c7048fe4a8c67c265cdae057cb3ca19f44 (patch)
treeee66c284e87c2a5b62b7d6e39fcdd0295bd058cc /NEWS
parent90c42e40d06ee35c4a2206fa2e00f49a988ee0c1 (diff)
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New generic log2f
Similar to the new logf: double precision arithmetics and a small lookup table is used. The argument reduction step is the same as in the new logf. without wrapper on aarch64: log2f reciprocal-throughput: 2.3x faster log2f latency: 2.1x faster old worst case error: 1.72 ulp new worst case error: 0.75 ulp aarch64 .text size: -252 bytes aarch64 .rodata size: +244 bytes * math/Makefile (type-float-routines): Add e_log2f_data. * sysdeps/ieee754/flt-32/e_log2f.c: New implementation. * sysdeps/ieee754/flt-32/e_log2f_data.c: New file. * sysdeps/ieee754/flt-32/math_config.h (__log2f_data): Define. (LOG2F_TABLE_BITS, LOG2F_POLY_ORDER): Define. * sysdeps/i386/fpu/e_log2f_data.c: New file. * sysdeps/ia64/fpu/e_log2f_data.c: New file. * sysdeps/m68k/m680x0/fpu/e_log2f_data.c: New file.
Diffstat (limited to 'NEWS')
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1 files changed, 1 insertions, 1 deletions
diff --git a/NEWS b/NEWS
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@@ -14,7 +14,7 @@ Major new features:
* Optimized x86-64 trunc and truncf for processors with SSE4.1.
-* Optimized generic expf, exp2f, logf.
+* Optimized generic expf, exp2f, logf, log2f.
* In order to support faster and safer process termination the malloc API
family of functions will no longer print a failure address and stack