diff --git a/manifest b/manifest
index d3e50a606b..60a8a88fd4 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Reinstate\sthe\sfpdecode()\sSQL\sfunction\sfor\stesting,\sbut\sonly\swhen\scompiled\nwith\sSQLITE_DEBUG.
-D 2023-07-01T18:33:26.856
+C This\scheck-in\sadds\sthe\suse\sof\s"long\sdouble"\sto\ssqlite3FpDecode()\swhich\swhen\nrun\son\sx86\susing\sa\scompiler\sthat\stranslates\s"long\sdouble"\sinto\sbinary80,\ncauses\sall\slegacy\stests\sto\spass.\s\sBut\son\sa\ssystem\swhere\s"long\sdouble"\sis\sjust\nan\salias\sfor\s"double",\ssome\sof\sthe\stests\sare\sstill\sfailing.
+D 2023-07-01T20:21:27.087
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -705,7 +705,7 @@ F src/trigger.c ad6ab9452715fa9a8075442e15196022275b414b9141b566af8cdb7a1605f2b0
 F src/update.c 0aa36561167a7c40d01163238c297297962f31a15a8d742216b3c37cdf25f731
 F src/upsert.c 5303dc6c518fa7d4b280ec65170f465c7a70b7ac2b22491598f6d0b4875b3145
 F src/utf.c ee39565f0843775cc2c81135751ddd93eceb91a673ea2c57f61c76f288b041a0
-F src/util.c 87e6762b026cd733312838b0e9b9acb43d3a3c88c5e612e8077a7320c2bc1692
+F src/util.c d68692390be083744bd0dfafc797472b0d304743040220e18b93bc9bad8c8d6e
 F src/vacuum.c 604fcdaebe76f3497c855afcbf91b8fa5046b32de3045bab89cc008d68e40104
 F src/vdbe.c 74282a947234513872a83b0bab1b8c644ece64b3e27b053ef17677c8ff9c81e0
 F src/vdbe.h 41485521f68e9437fdb7ec4a90f9d86ab294e9bb8281e33b235915e29122cfc0
@@ -2041,8 +2041,8 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 6f1122e942b8269552daaf13d647d200d8546ec25f36310d67037c6b58d09976
-R eef1ed887e702bb26e5ed7046220e6a0
+P 07eab52e0801bb0e4743b304a06ad16e18cdf8eaa18c0faf8d47a1f5d8576ea0
+R c4051b06b266c29a490b4cec354913fc
 U drh
-Z 09a504821196951b22da7c1db783401d
+Z 95eef79511e3e10371b4b76031a5a06d
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index 9eae2022f6..d2f8b9d453 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-07eab52e0801bb0e4743b304a06ad16e18cdf8eaa18c0faf8d47a1f5d8576ea0
\ No newline at end of file
+ce06982f880339cf46704e95c907249827c3e44af2b9420005200ca8abd3f371
\ No newline at end of file
diff --git a/src/util.c b/src/util.c
index 41359ea2a2..a560f26133 100644
--- a/src/util.c
+++ b/src/util.c
@@ -937,15 +937,16 @@ int sqlite3Atoi(const char *z){
 ** decimal point if n is negative.  No rounding is performed if
 ** n is zero.
 */
-void sqlite3FpDecode(FpDecode *p, double r, int iRound, int mxRound){
+void sqlite3FpDecode(FpDecode *p, double rr, int iRound, int mxRound){
   int i;
   u64 v;
   int e, exp = 0;
+  long double r;
   p->isSpecial = 0;
-  if( r<0.0 ){
+  if( rr<0.0 ){
     p->sign = '-';
-    r = -r;
-  }else if( r==0.0 ){
+    rr = -rr;
+  }else if( rr==0.0 ){
     p->sign = '+';
     p->n = 1;
     p->iDP = 1;
@@ -954,7 +955,7 @@ void sqlite3FpDecode(FpDecode *p, double r, int iRound, int mxRound){
   }else{
     p->sign = '+';
   }
-  memcpy(&v,&r,8);
+  memcpy(&v,&rr,8);
   e = v>>52;
   if( (e&0x7ff)==0x7ff ){
     p->isSpecial = 1 + (v!=0x7ff0000000000000L);
@@ -962,6 +963,7 @@ void sqlite3FpDecode(FpDecode *p, double r, int iRound, int mxRound){
     p->iDP = 0;
     return;
   }
+  r = rr;
 
   /* At this point, r is positive (non-zero) and is not Inf or NaN.
   ** The strategy is to multiple or divide r by powers of 10 until
@@ -969,13 +971,13 @@ void sqlite3FpDecode(FpDecode *p, double r, int iRound, int mxRound){
   ** an unsigned 64-bit integer v, and extract digits from v.
   */
   if( r>=1.0e+19 ){
-    while( r>=1.0e+119 ){ exp+=100; r /= 1.0e+100; }
-    while( r>=1.0e+29  ){ exp+=10;  r /= 1.0e+10;  }
-    while( r>=1.0e+19  ){ exp++;    r /= 10.0;     }
+    while( r>=1.0e+119L ){ exp+=100; r *= 1.0e-100L; }
+    while( r>=1.0e+29L  ){ exp+=10;  r *= 1.0e-10L;  }
+    while( r>=1.0e+19L  ){ exp++;    r *= 1.0e-1L;   }
   }else{
-    while( r<1.0e-97   ){ exp-=100; r *= 1.0e+100; }
-    while( r<1.0e+07   ){ exp-=10;  r *= 1.0e+10;  }
-    while( r<1.0e+17   ){ exp--;    r *= 10.0;     }
+    while( r<1.0e-97L   ){ exp-=100; r *= 1.0e+100L; }
+    while( r<1.0e+07L   ){ exp-=10;  r *= 1.0e+10L;  }
+    while( r<1.0e+17L   ){ exp--;    r *= 1.0e+1L;   }
   }
   v = (u64)r;
   i = sizeof(p->z)-1;