Bruce Evans a00672cff9 Use a better method of scaling by 2**k. Instead of adding to the ... exponent bits of the reduced result, construct 2**k (hopefully in parallel with the construction of the reduced result) and multiply by it. This tends to be much faster if the construction of 2**k is actually in parallel, and might be faster even with no parallelism since adjustment of the exponent requires a read-modify-wrtite at an unfortunate time for pipelines. In some cases involving exp2* on amd64 (A64), this change saves about 40 cycles or 30%. I think it is inherently only about 12 cycles faster in these cases and the rest of the speedup is from partly-accidentally avoiding compiler pessimizations (the construction of 2**k is now manually scheduled for good results, and -O2 doesn't always mess this up). In most cases on amd64 (A64) and i386 (A64) the speedup is about 20 cycles. The worst case that I found is expf on ia64 where this change is a pessimization of about 10 cycles or 5%. The manual scheduling for plain exp[f] is harder and not as tuned. Details specific to expm1*: - the saving is closer to 12 cycles than to 40 for expm1* on i386 (A64). For some reason it is much larger for negative args. - also convert to __FBSDID().		2008-02-07 09:42:19 +00:00
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amd64	Implement rintl(), nearbyintl(), lrintl(), and llrintl().	2008-01-14 02:12:07 +00:00
arm	Use C comments since we now preprocess these files with CPP.	2007-04-29 14:05:22 +00:00
bsdsrc	Fix tgamma() on some special args:	2007-05-02 15:24:49 +00:00
i387	Implement rintl(), nearbyintl(), lrintl(), and llrintl().	2008-01-14 02:12:07 +00:00
ia64	Use C comments since we now preprocess these files with CPP.	2007-04-29 14:05:22 +00:00
ld80	Use a better method of scaling by 2**k. Instead of adding to the	2008-02-07 03:17:05 +00:00
ld128	Use a better method of scaling by 2**k. Instead of adding to the	2008-02-07 03:17:05 +00:00
man	Introduce a new log(3) manpage and move the relevant functions there.	2008-01-18 21:43:00 +00:00
powerpc	Use C comments since we now preprocess these files with CPP.	2007-04-29 14:05:22 +00:00
sparc64	Use C comments since we now preprocess these files with CPP.	2007-04-29 14:05:22 +00:00
src	Use a better method of scaling by 2**k. Instead of adding to the	2008-02-07 09:42:19 +00:00
Makefile	Hook up exp2l() and related docs to the build.	2008-01-18 21:43:10 +00:00
Symbol.map	Hook up exp2l() and related docs to the build.	2008-01-18 21:43:10 +00:00