From: drh <drh@noemail.net>
Date: Mon, 17 Oct 2011 12:14:26 +0000 (+0000)
Subject: Performance improvement for ascii to floating-point conversions with very
X-Git-Tag: version-3.7.9~25
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=2458a2e742b9cd1c732485656e96364e05130316;p=thirdparty%2Fsqlite.git

Performance improvement for ascii to floating-point conversions with very
large exponents.

FossilOrigin-Name: 59bb999c8ba5e4ee7a4e388fc724b8606136d60c
---

diff --git a/manifest b/manifest
index abe3a3a7d3..eb75006444 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Added\sthe\stool/warnings-clang.sh\sscript.\s\sChanges\sso\sthat\sthere\sare\sno\nwarnings\swith\seither\sgcc\sor\sclang\seven\sincluding\sFTS4\sand\sRTREE\sand\nboth\swith\sand\swithout\sSQLITE_THREADSAFE=0.
-D 2011-10-15T00:16:30.056
+C Performance\simprovement\sfor\sascii\sto\sfloating-point\sconversions\swith\svery\nlarge\sexponents.
+D 2011-10-17T12:14:26.646
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in a162fe39e249b8ed4a65ee947c30152786cfe897
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -236,7 +236,7 @@ F src/tokenize.c c819d9f72168a035d545a5bdafe9b085b20df705
 F src/trigger.c 1cfb80e2290ef66ea89cb4e821caae65a02c0d56
 F src/update.c 25e046a8f69d5e557aabde2000487b8545509d8d
 F src/utf.c 890c67dcfcc7a74623c95baac7535aadfe265e84
-F src/util.c 06302ffd2b80408d4f6c7af71f7090e0cf8d8ff7
+F src/util.c a982d7ee3c4aca643b01abc6f742f61fea1e4fa3
 F src/vacuum.c 0c0ba2242355c6048d65e2b333abe0f7c06348fa
 F src/vdbe.c 75e626a6e6aefbd35b25ccab8bff533a65354638
 F src/vdbe.h f0725ee997db869ecae5bb70a71612aabeca7755
@@ -970,7 +970,7 @@ F tool/tostr.awk e75472c2f98dd76e06b8c9c1367f4ab07e122d06
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
 F tool/warnings-clang.sh 9f406d66e750e8ac031c63a9ef3248aaa347ef2a
 F tool/warnings.sh fbc018d67fd7395f440c28f33ef0f94420226381
-P b3324f6cc27c3bfb32b12eacace2fc731c2dd644
-R fdfdc42f8d308f4430129946a791fabf
+P 39408702a989f907261c298bf0947f3e68bd10fe
+R 204579a8fff7f7f01b8c865c0b12cfa2
 U drh
-Z b3da471414a86656d736be9bf8ce9b6c
+Z 09bec3cab67bc63e509e3048fd3a5001
diff --git a/manifest.uuid b/manifest.uuid
index ebd5525f92..422a541e4d 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-39408702a989f907261c298bf0947f3e68bd10fe
\ No newline at end of file
+59bb999c8ba5e4ee7a4e388fc724b8606136d60c
\ No newline at end of file
diff --git a/src/util.c b/src/util.c
index 67e43b4ba8..f4a6c7d008 100644
--- a/src/util.c
+++ b/src/util.c
@@ -382,6 +382,12 @@ do_atof_calc:
           result = s * scale;
           result *= 1.0e+308;
         }
+      }else if( e>=342 ){
+        if( esign<0 ){
+          result = 0.0*s;
+        }else{
+          result = 1e308*1e308*s;  /* Infinity */
+        }
       }else{
         /* 1.0e+22 is the largest power of 10 than can be 
         ** represented exactly. */