Alternative implementation for the internal sqlite3Pow10() utility for MSVC,

which is more accurate on that platform.

FossilOrigin-Name: 469b96be5350ba2291518280ffe179b87aa7fbe701e2813ef63843922771517a

diff --git a/manifest b/manifest
index 5e365cf00f15bbd9fd1637511f538ae83b527343..9206bfe480f0437029702dae4f1e2a9209d5c844 100644 (file)
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Fix\sa\sproblem\scausing\sthe\ssessions\smodule\sto\soccasionally\slose\strack\sof\srows\nwith\scomposite\sprimary\skeys\swhen\sthere\sare\stwo\srows\swith\sthe\ssame\stext\svalue\nin\sthe\sleftmost\scolumn\sof\sthe\sPK.
-D 2018-01-17T17:38:18.448
+C Alternative\simplementation\sfor\sthe\sinternal\ssqlite3Pow10()\sutility\sfor\sMSVC,\nwhich\sis\smore\saccurate\son\sthat\splatform.
+D 2018-01-17T21:14:17.292
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F Makefile.in 38f84f301cbef443b2d269f67a74b8cc536469831f70df7c3e912acc04932cc2
@@ -553,7 +553,7 @@ F src/treeview.c eae35972ff44f67064de2eaf35f04afe94e7aea3271a8b3bcebb3f954880fec
 F src/trigger.c a34539c69433276d37b0da9a89c117726ff2d292c0902895af1f393a983cd3a1
 F src/update.c a90a32ffc0100265b0693dbbdbe490756447af181f5ea2c138cce515b08c8795
 F src/utf.c 810fbfebe12359f10bc2a011520a6e10879ab2a163bcb26c74768eab82ea62a5
-F src/util.c 7315e97a8dc2c8e19ca64196c652cf0a65d13fd0a211b2cec082062372dc6261
+F src/util.c ef4a5f904d942e660abade7fbf3e6bdb402dabe9e7c27f3361ecf40b945538b5
 F src/vacuum.c 90839322fd5f00df9617eb21b68beda9b6e2a2937576b0d65985e4aeb1c53739
 F src/vdbe.c ccc1e17a30325068ae4f0292e8601997946886d23acc989c68f2a261a2795c70
 F src/vdbe.h 134beb7a12a6213c00eba58febaede33447cc4441bc568a0d9c144b33fc3720a
@@ -1700,7 +1700,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P a8aea925f8fde8f2dc5ff4b744d54aa2bf8916f3ee57f22d77fd1ddb5a35a9cc
-R fffe7fea955e558a2fcc7877bcdc39db
-U dan
-Z 8da05c1c6303c10ad33f099cfa382df7
+P 09aed13678374bf22087cd808808b711dc703b7c18bc8aaf704850611e17f5cd
+R aea01f6bc87a81119a2fde124523cf0a
+U drh
+Z 99d77d5f6e6371ac4335dbc304fd54d9

diff --git a/manifest.uuid b/manifest.uuid
index 41ac115dac35e1eb61f53d31dea45404460d4842..430019ccf5fe779fae3bd7326ed6bd1f17d1eb3e 100644 (file)
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-09aed13678374bf22087cd808808b711dc703b7c18bc8aaf704850611e17f5cd
\ No newline at end of file
+469b96be5350ba2291518280ffe179b87aa7fbe701e2813ef63843922771517a
\ No newline at end of file

diff --git a/src/util.c b/src/util.c
index 75de4b3b307fd8be265cfe327d6e6bbc242f4bfd..456317cfa9282586288baba1ebd4eaca54e7009d 100644 (file)
--- a/src/util.c
+++ b/src/util.c
@@ -327,6 +327,26 @@ int sqlite3_strnicmp(const char *zLeft, const char *zRight, int N){
 ** This routine only works for values of E between 1 and 341.
 */
 static LONGDOUBLE_TYPE sqlite3Pow10(int E){
+#if defined(_MSC_VER)
+  static const LONGDOUBLE_TYPE x[] = {
+    1.0e+001,
+    1.0e+002,
+    1.0e+004,
+    1.0e+008,
+    1.0e+016,
+    1.0e+032,
+    1.0e+064,
+    1.0e+128,
+    1.0e+256
+  };
+  LONGDOUBLE_TYPE r = 1.0;
+  int i;
+  assert( E>=0 && E<=307 );
+  for(i=0; E!=0; i++, E >>=1){
+    if( E & 1 ) r *= x[i];
+  }
+  return r;
+#else
   LONGDOUBLE_TYPE x = 10.0;
   LONGDOUBLE_TYPE r = 1.0;
   while(1){
@@ -336,6 +356,7 @@ static LONGDOUBLE_TYPE sqlite3Pow10(int E){
     x *= x;
   }
   return r; 
+#endif
 }
 
 /*