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author | bde <bde@FreeBSD.org> | 2008-02-07 03:17:05 +0000 |
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committer | bde <bde@FreeBSD.org> | 2008-02-07 03:17:05 +0000 |
commit | 22e608f1ceb21dc3bb9bf5cda8f34642cc6e623f (patch) | |
tree | 39de11ac1fa020a02f07f29ebaac4e42ac04c4d5 /lib/msun/src/e_exp.c | |
parent | 67c8e0948c3ec70e3bdfebe1cf5c79cf617f726b (diff) | |
download | FreeBSD-src-22e608f1ceb21dc3bb9bf5cda8f34642cc6e623f.zip FreeBSD-src-22e608f1ceb21dc3bb9bf5cda8f34642cc6e623f.tar.gz |
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.
This change ld128/s_exp2l.c has not been tested.
Diffstat (limited to 'lib/msun/src/e_exp.c')
-rw-r--r-- | lib/msun/src/e_exp.c | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/lib/msun/src/e_exp.c b/lib/msun/src/e_exp.c index 60b8b2a..0809c66 100644 --- a/lib/msun/src/e_exp.c +++ b/lib/msun/src/e_exp.c @@ -102,7 +102,7 @@ P5 = 4.13813679705723846039e-08; /* 0x3E663769, 0x72BEA4D0 */ double __ieee754_exp(double x) /* default IEEE double exp */ { - double y,hi=0.0,lo=0.0,c,t; + double y,hi=0.0,lo=0.0,c,t,twopk; int32_t k=0,xsb; u_int32_t hx; @@ -142,18 +142,17 @@ __ieee754_exp(double x) /* default IEEE double exp */ /* x is now in primary range */ t = x*x; + if(k >= -1021) + INSERT_WORDS(twopk,0x3ff00000+(k<<20), 0); + else + INSERT_WORDS(twopk,0x3ff00000+((k+1000)<<20), 0); c = x - t*(P1+t*(P2+t*(P3+t*(P4+t*P5)))); if(k==0) return one-((x*c)/(c-2.0)-x); else y = one-((lo-(x*c)/(2.0-c))-hi); if(k >= -1021) { - u_int32_t hy; - GET_HIGH_WORD(hy,y); - SET_HIGH_WORD(y,hy+(k<<20)); /* add k to y's exponent */ - return y; + if (k==1024) return y*2.0*0x1p1023; + return y*twopk; } else { - u_int32_t hy; - GET_HIGH_WORD(hy,y); - SET_HIGH_WORD(y,hy+((k+1000)<<20)); /* add k to y's exponent */ - return y*twom1000; + return y*twopk*twom1000; } } |