Remove slow paths from log

Remove the slow paths from log.  Like several other double precision math
functions, log is exactly rounded.  This is not required from math functions
and causes major overheads as it requires multiple fallbacks using higher
precision arithmetic if a result is close to 0.5ULP.  Ridiculous slowdowns
of up to 100000x have been reported when the highest precision path triggers.

Interestingly removing the slow paths makes hardly any difference in practice:
the worst case error is still ~0.502ULP, and exp(log(x)) shows identical results
before/after on many millions of random cases.  All GLIBC math tests pass on
AArch64 and x64 with no change in ULP error.  A simple test over a few hundred
million values shows log is now 18% faster on average.

	* manual/probes.texi (slowlog): Delete documentation of removed probe.
	(slowlog_inexact): Likewise
	* sysdeps/ieee754/dbl-64/e_log.c (__ieee754_log): Remove slow paths.
	* sysdeps/ieee754/dbl-64/ulog.h: Remove unused declarations.

1 files changed, 0 insertions, 94 deletions

diff --git a/sysdeps/ieee754/dbl-64/ulog.h b/sysdeps/ieee754/dbl-64/ulog.h
index 36a31137b7..087b76e2ab 100644
--- a/sysdeps/ieee754/dbl-64/ulog.h
+++ b/sysdeps/ieee754/dbl-64/ulog.h
@@ -42,43 +42,6 @@
 /**/ b6             = {{0x3fbc71c5, 0x25db58ac} }, /*  0.111... */
 /**/ b7             = {{0xbfb9a4ac, 0x11a2a61c} }, /* -0.100... */
 /**/ b8             = {{0x3fb75077, 0x0df2b591} }, /*  0.091... */
-  /* polynomial III */
-#if 0
-/**/ c1             = {{0x3ff00000, 0x00000000} }, /*  1        */
-#endif
-/**/ c2             = {{0xbfe00000, 0x00000000} }, /* -1/2      */
-/**/ c3             = {{0x3fd55555, 0x55555555} }, /*  1/3      */
-/**/ c4             = {{0xbfd00000, 0x00000000} }, /* -1/4      */
-/**/ c5             = {{0x3fc99999, 0x9999999a} }, /*  1/5      */
-  /* polynomial IV */
-/**/ d2             = {{0xbfe00000, 0x00000000} }, /* -1/2      */
-/**/ dd2            = {{0x00000000, 0x00000000} }, /* -1/2-d2   */
-/**/ d3             = {{0x3fd55555, 0x55555555} }, /*  1/3      */
-/**/ dd3            = {{0x3c755555, 0x55555555} }, /*  1/3-d3   */
-/**/ d4             = {{0xbfd00000, 0x00000000} }, /* -1/4      */
-/**/ dd4            = {{0x00000000, 0x00000000} }, /* -1/4-d4   */
-/**/ d5             = {{0x3fc99999, 0x9999999a} }, /*  1/5      */
-/**/ dd5            = {{0xbc699999, 0x9999999a} }, /*  1/5-d5   */
-/**/ d6             = {{0xbfc55555, 0x55555555} }, /* -1/6      */
-/**/ dd6            = {{0xbc655555, 0x55555555} }, /* -1/6-d6   */
-/**/ d7             = {{0x3fc24924, 0x92492492} }, /*  1/7      */
-/**/ dd7            = {{0x3c624924, 0x92492492} }, /*  1/7-d7   */
-/**/ d8             = {{0xbfc00000, 0x00000000} }, /* -1/8      */
-/**/ dd8            = {{0x00000000, 0x00000000} }, /* -1/8-d8   */
-/**/ d9             = {{0x3fbc71c7, 0x1c71c71c} }, /*  1/9      */
-/**/ dd9            = {{0x3c5c71c7, 0x1c71c71c} }, /*  1/9-d9   */
-/**/ d10            = {{0xbfb99999, 0x9999999a} }, /* -1/10     */
-/**/ dd10           = {{0x3c599999, 0x9999999a} }, /* -1/10-d10 */
-/**/ d11            = {{0x3fb745d1, 0x745d1746} }, /*  1/11     */
-/**/ d12            = {{0xbfb55555, 0x55555555} }, /* -1/12     */
-/**/ d13            = {{0x3fb3b13b, 0x13b13b14} }, /*  1/13     */
-/**/ d14            = {{0xbfb24924, 0x92492492} }, /* -1/14     */
-/**/ d15            = {{0x3fb11111, 0x11111111} }, /*  1/15     */
-/**/ d16            = {{0xbfb00000, 0x00000000} }, /* -1/16     */
-/**/ d17            = {{0x3fae1e1e, 0x1e1e1e1e} }, /*  1/17     */
-/**/ d18            = {{0xbfac71c7, 0x1c71c71c} }, /* -1/18     */
-/**/ d19            = {{0x3faaf286, 0xbca1af28} }, /*  1/19     */
-/**/ d20            = {{0xbfa99999, 0x9999999a} }, /* -1/20     */
   /* constants    */
 /**/ sqrt_2         = {{0x3ff6a09e, 0x667f3bcc} }, /* sqrt(2)   */
 /**/ h1             = {{0x3fd2e000, 0x00000000} }, /* 151/2**9  */
@@ -87,14 +50,6 @@
 /**/ delv           = {{0x3ef00000, 0x00000000} }, /* 1/2**16   */
 /**/ ln2a           = {{0x3fe62e42, 0xfefa3800} }, /* ln(2) 43 bits */
 /**/ ln2b           = {{0x3d2ef357, 0x93c76730} }, /* ln(2)-ln2a    */
-/**/ e1             = {{0x3bbcc868, 0x00000000} }, /* 6.095e-21     */
-/**/ e2             = {{0x3c1138ce, 0x00000000} }, /* 2.334e-19     */
-/**/ e3             = {{0x3aa1565d, 0x00000000} }, /* 2.801e-26     */
-/**/ e4             = {{0x39809d88, 0x00000000} }, /* 1.024e-31     */
-/**/ e[M]           ={{{0x37da223a, 0x00000000} }, /* 1.2e-39       */
-/**/                  {{0x35c851c4, 0x00000000} }, /* 1.3e-49       */
-/**/                  {{0x2ab85e51, 0x00000000} }, /* 6.8e-103      */
-/**/                  {{0x17383827, 0x00000000} }},/* 8.1e-197      */
 /**/ two54          = {{0x43500000, 0x00000000} }, /* 2**54         */
 /**/ u03            = {{0x3f9eb851, 0xeb851eb8} }; /* 0.03          */
 
@@ -114,43 +69,6 @@
 /**/ b6             = {{0x25db58ac, 0x3fbc71c5} }, /*  0.111... */
 /**/ b7             = {{0x11a2a61c, 0xbfb9a4ac} }, /* -0.100... */
 /**/ b8             = {{0x0df2b591, 0x3fb75077} }, /*  0.091... */
-  /* polynomial III */
-#if 0
-/**/ c1             = {{0x00000000, 0x3ff00000} }, /*  1        */
-#endif
-/**/ c2             = {{0x00000000, 0xbfe00000} }, /* -1/2      */
-/**/ c3             = {{0x55555555, 0x3fd55555} }, /*  1/3      */
-/**/ c4             = {{0x00000000, 0xbfd00000} }, /* -1/4      */
-/**/ c5             = {{0x9999999a, 0x3fc99999} }, /*  1/5      */
-  /* polynomial IV */
-/**/ d2             = {{0x00000000, 0xbfe00000} }, /* -1/2      */
-/**/ dd2            = {{0x00000000, 0x00000000} }, /* -1/2-d2   */
-/**/ d3             = {{0x55555555, 0x3fd55555} }, /*  1/3      */
-/**/ dd3            = {{0x55555555, 0x3c755555} }, /*  1/3-d3   */
-/**/ d4             = {{0x00000000, 0xbfd00000} }, /* -1/4      */
-/**/ dd4            = {{0x00000000, 0x00000000} }, /* -1/4-d4   */
-/**/ d5             = {{0x9999999a, 0x3fc99999} }, /*  1/5      */
-/**/ dd5            = {{0x9999999a, 0xbc699999} }, /*  1/5-d5   */
-/**/ d6             = {{0x55555555, 0xbfc55555} }, /* -1/6      */
-/**/ dd6            = {{0x55555555, 0xbc655555} }, /* -1/6-d6   */
-/**/ d7             = {{0x92492492, 0x3fc24924} }, /*  1/7      */
-/**/ dd7            = {{0x92492492, 0x3c624924} }, /*  1/7-d7   */
-/**/ d8             = {{0x00000000, 0xbfc00000} }, /* -1/8      */
-/**/ dd8            = {{0x00000000, 0x00000000} }, /* -1/8-d8   */
-/**/ d9             = {{0x1c71c71c, 0x3fbc71c7} }, /*  1/9      */
-/**/ dd9            = {{0x1c71c71c, 0x3c5c71c7} }, /*  1/9-d9   */
-/**/ d10            = {{0x9999999a, 0xbfb99999} }, /* -1/10     */
-/**/ dd10           = {{0x9999999a, 0x3c599999} }, /* -1/10-d10 */
-/**/ d11            = {{0x745d1746, 0x3fb745d1} }, /*  1/11     */
-/**/ d12            = {{0x55555555, 0xbfb55555} }, /* -1/12     */
-/**/ d13            = {{0x13b13b14, 0x3fb3b13b} }, /*  1/13     */
-/**/ d14            = {{0x92492492, 0xbfb24924} }, /* -1/14     */
-/**/ d15            = {{0x11111111, 0x3fb11111} }, /*  1/15     */
-/**/ d16            = {{0x00000000, 0xbfb00000} }, /* -1/16     */
-/**/ d17            = {{0x1e1e1e1e, 0x3fae1e1e} }, /*  1/17     */
-/**/ d18            = {{0x1c71c71c, 0xbfac71c7} }, /* -1/18     */
-/**/ d19            = {{0xbca1af28, 0x3faaf286} }, /*  1/19     */
-/**/ d20            = {{0x9999999a, 0xbfa99999} }, /* -1/20     */
   /* constants    */
 /**/ sqrt_2         = {{0x667f3bcc, 0x3ff6a09e} }, /* sqrt(2)   */
 /**/ h1             = {{0x00000000, 0x3fd2e000} }, /* 151/2**9  */
@@ -159,14 +77,6 @@
 /**/ delv           = {{0x00000000, 0x3ef00000} }, /* 1/2**16   */
 /**/ ln2a           = {{0xfefa3800, 0x3fe62e42} }, /* ln(2) 43 bits */
 /**/ ln2b           = {{0x93c76730, 0x3d2ef357} }, /* ln(2)-ln2a    */
-/**/ e1             = {{0x00000000, 0x3bbcc868} }, /* 6.095e-21     */
-/**/ e2             = {{0x00000000, 0x3c1138ce} }, /* 2.334e-19     */
-/**/ e3             = {{0x00000000, 0x3aa1565d} }, /* 2.801e-26     */
-/**/ e4             = {{0x00000000, 0x39809d88} }, /* 1.024e-31     */
-/**/ e[M]           ={{{0x00000000, 0x37da223a} }, /* 1.2e-39       */
-/**/                  {{0x00000000, 0x35c851c4} }, /* 1.3e-49       */
-/**/                  {{0x00000000, 0x2ab85e51} }, /* 6.8e-103      */
-/**/                  {{0x00000000, 0x17383827} }},/* 8.1e-197      */
 /**/ two54          = {{0x00000000, 0x43500000} }, /* 2**54         */
 /**/ u03            = {{0xeb851eb8, 0x3f9eb851} }; /* 0.03          */
 
@@ -178,10 +88,6 @@
 #define  DEL_V     delv.d
 #define  LN2A      ln2a.d
 #define  LN2B      ln2b.d
-#define  E1        e1.d
-#define  E2        e2.d
-#define  E3        e3.d
-#define  E4        e4.d
 #define  U03       u03.d
 
 #endif