From 068a251d9982d7f57694d5b901078b94dc5b0ad0 Mon Sep 17 00:00:00 2001
From: drh <drh@noemail.net>
Date: Tue, 13 Jan 2015 21:26:17 +0000
Subject: [PATCH] Simplify some code in rtree, to avoid confusing the optimizer
 in GCC on some macs: gcc version 4.2.1 (Based on Apple Inc. build 5658) (LLVM
 build 2335.15.00). Prior to these changes, compiling with -O3 would cause
 incorrect code to be generated.  The change to the nodeGetCell() routine is
 key.  The other changes are merely cosmetic details discovered while bug
 hunting.

FossilOrigin-Name: 882181ff9dd75f32db266db6e476671021fc567b
---
 ext/rtree/rtree.c | 12 +++++-------
 manifest          | 12 ++++++------
 manifest.uuid     |  2 +-
 3 files changed, 12 insertions(+), 14 deletions(-)

diff --git a/ext/rtree/rtree.c b/ext/rtree/rtree.c
index 058dc96a4c..201d3cfff2 100644
--- a/ext/rtree/rtree.c
+++ b/ext/rtree/rtree.c
@@ -369,13 +369,12 @@ static int readInt16(u8 *p){
   return (p[0]<<8) + p[1];
 }
 static void readCoord(u8 *p, RtreeCoord *pCoord){
-  u32 i = (
+  pCoord->u = (
     (((u32)p[0]) << 24) + 
     (((u32)p[1]) << 16) + 
     (((u32)p[2]) <<  8) + 
     (((u32)p[3]) <<  0)
   );
-  *(u32 *)pCoord = i;
 }
 static i64 readInt64(u8 *p){
   return (
@@ -404,7 +403,7 @@ static int writeCoord(u8 *p, RtreeCoord *pCoord){
   u32 i;
   assert( sizeof(RtreeCoord)==4 );
   assert( sizeof(u32)==4 );
-  i = *(u32 *)pCoord;
+  i = pCoord->u;
   p[0] = (i>>24)&0xFF;
   p[1] = (i>>16)&0xFF;
   p[2] = (i>> 8)&0xFF;
@@ -735,14 +734,13 @@ static void nodeGetCell(
   RtreeCell *pCell             /* OUT: Write the cell contents here */
 ){
   u8 *pData;
-  u8 *pEnd;
   RtreeCoord *pCoord;
+  int ii;
   pCell->iRowid = nodeGetRowid(pRtree, pNode, iCell);
   pData = pNode->zData + (12 + pRtree->nBytesPerCell*iCell);
-  pEnd = pData + pRtree->nDim*8;
   pCoord = pCell->aCoord;
-  for(; pData<pEnd; pData+=4, pCoord++){
-    readCoord(pData, pCoord);
+  for(ii=0; ii<pRtree->nDim*2; ii++){
+    readCoord(&pData[ii*4], &pCoord[ii]);
   }
 }
 
diff --git a/manifest b/manifest
index 0ced843c65..d2eb0110ac 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Fix\sthe\se_walauto.test\stest\smodule\sso\sthat\sit\sworks\son\sboth\slittle-endian\sand\nbig-ending\smachines.
-D 2015-01-13T01:12:43.817
+C Simplify\ssome\scode\sin\srtree,\sto\savoid\sconfusing\sthe\soptimizer\sin\sGCC\son\nsome\smacs:\ngcc\sversion\s4.2.1\s(Based\son\sApple\sInc.\sbuild\s5658)\s(LLVM\sbuild\s2335.15.00).\nPrior\sto\sthese\schanges,\scompiling\swith\s-O3\swould\scause\sincorrect\scode\sto\nbe\sgenerated.\s\sThe\schange\sto\sthe\snodeGetCell()\sroutine\sis\skey.\s\sThe\sother\nchanges\sare\smerely\scosmetic\sdetails\sdiscovered\swhile\sbug\shunting.
+D 2015-01-13T21:26:17.584
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 9efcdb5c6025caea362cdfc38817451170fc6344
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -124,7 +124,7 @@ F ext/misc/vfslog.c fe40fab5c077a40477f7e5eba994309ecac6cc95
 F ext/misc/vtshim.c babb0dc2bf116029e3e7c9a618b8a1377045303e
 F ext/misc/wholenumber.c 784b12543d60702ebdd47da936e278aa03076212
 F ext/rtree/README 6315c0d73ebf0ec40dedb5aa0e942bc8b54e3761
-F ext/rtree/rtree.c b61e9eab7229a443d0d2029da7624299e19301a2
+F ext/rtree/rtree.c 14e6239434d4e3f65d3e90320713f26aa24e167f
 F ext/rtree/rtree.h 834dbcb82dc85b2481cde6a07cdadfddc99e9b9e
 F ext/rtree/rtree1.test 541bbcab74613907fea08b2ecdcdd5b7aa724cc9
 F ext/rtree/rtree2.test acbb3a4ce0f4fbc2c304d2b4b784cfa161856bba
@@ -1236,7 +1236,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh 0abfd78ceb09b7f7c27c688c8e3fe93268a13b32
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P e693e11d1b9265974c32bddba873ea30a4d0b708
-R 5f43a97405384c08e7d2695a40688554
+P 5682db7b871689b9ee764afe070736f378e8ae1b
+R dfd426dd4e5c9bb35969866ff363968f
 U drh
-Z 3c1c71c98fb9cbeb713c59bb71069029
+Z bd5f3f08ebc84ee22d9c4c92ffb9e94c
diff --git a/manifest.uuid b/manifest.uuid
index c534efe236..4e9c91e56e 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-5682db7b871689b9ee764afe070736f378e8ae1b
\ No newline at end of file
+882181ff9dd75f32db266db6e476671021fc567b
\ No newline at end of file