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Fix Noise compiled under clang >= 3.7.x with -O2 or higher
kwolekr authored 
When compiled with optimizations, the most recent versions of clang seem
to 'optimize' out a crucial "and %reg, 0x7FFFFFFF" instruction in noise2d(),
probably because it somehow assumed the variable n would never become greater
than that amount.
Indeed, signed integer underflow is undefined behavior in C and C++, so while
this optimization is "correct" in that sense, it breaks lots of existing code.
Solved by changing n to an unsigned type, making behavior well-defined.
d198e420
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user avatar d198e420
History
Name Last commit Last update
..
cguittfont
client
gmp
json
lua
network
script
threading
unittest
util
CMakeLists.txt
activeobject.h
areastore.cpp
areastore.h
ban.cpp
ban.h
basicmacros.h
camera.cpp
camera.h
cavegen.cpp
cavegen.h
chat.cpp
chat.h
client.cpp
client.h
clientiface.cpp
clientiface.h
clientmap.cpp
clientmap.h
clientmedia.cpp
clientmedia.h
clientobject.cpp
clientobject.h
clientsimpleobject.h
clouds.cpp
clouds.h
cmake_config.h.in
cmake_config_githash.h.in
collision.cpp
collision.h
config.h
constants.h
content_abm.cpp
content_abm.h
content_cao.cpp
content_cao.h
content_cso.cpp
content_cso.h
content_mapblock.cpp
content_mapblock.h
content_mapnode.cpp
content_mapnode.h
content_nodemeta.cpp
content_nodemeta.h
content_sao.cpp
content_sao.h
convert_json.cpp
convert_json.h
craftdef.cpp
craftdef.h
database-dummy.cpp
database-dummy.h
database-leveldb.cpp
database-leveldb.h
database-redis.cpp
database-redis.h
database-sqlite3.cpp
database-sqlite3.h
database.cpp
database.h
daynightratio.h
debug.cpp
debug.h
defaultsettings.cpp
defaultsettings.h
drawscene.cpp
drawscene.h
dungeongen.cpp
dungeongen.h
emerge.cpp
emerge.h
environment.cpp
environment.h
event.h
event_manager.h
exceptions.h
filecache.cpp
filecache.h
filesys.cpp
filesys.h
fontengine.cpp
fontengine.h
game.cpp
game.h
gamedef.h
gameparams.h
genericobject.cpp
genericobject.h
gettext.cpp
gettext.h