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Lower release build optimizations from -O3 to -O2.

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In the last few weeks I've played again through the game and kept an eye
on small oddities. And there're a lot of them. For example some GUIs and
videos getting stuck after the first frame (issue #192) or being unable
to protect the guy with the lamp in Alpha Labs 3. Some digging proved
that most - if not all - of these problems are caused by the compilers
optimization level. When build with -O2 both g++ 8.1 and clang 6.0.0 are
producing working code. g++ 8.1 with -O3 has some small, hard to notice
oddities, clang 6.0.0 with -O3 shows a lot of them. Since there's not
measurable difference between -O3 and -O2 just go down to the later:

x doom_o3.txt
+ doom_o2.txt
+----------------------------------------------------------------------+
|                                                               +      |
|                                      +                        *      |
|x                                     *           x            *      |
|                 |_____________________|___A______M__A_________M___|_||
+----------------------------------------------------------------------+

    N        Min           Max        Median           Avg        Stddev
x   5        173           178           177         176.4     2.0736441
+   5        176           178           178         177.2     1.0954451
This commit is contained in:
Yamagi Burmeister 2018-07-03 15:20:31 +02:00 committed by Daniel Gibson
parent 84e5ef45bc
commit aa40145157
1 changed files with 2 additions and 2 deletions
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4
CMakeLists.txt
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@ -157,8 +157,8 @@ if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID STREQUAL "Clang")
set(CMAKE_C_FLAGS_DEBUG "-g -D_DEBUG -O1")
set(CMAKE_C_FLAGS_DEBUGALL "-g -ggdb -D_DEBUG")
set(CMAKE_C_FLAGS_PROFILE "-g -ggdb -D_DEBUG -O1 -fno-omit-frame-pointer")
set(CMAKE_C_FLAGS_RELEASE "-O3 -ffast-math -fno-unsafe-math-optimizations -fomit-frame-pointer")
set(CMAKE_C_FLAGS_RELWITHDEBINFO "-g -O3 -ffast-math -fno-unsafe-math-optimizations -fomit-frame-pointer")
set(CMAKE_C_FLAGS_RELEASE "-O2 -ffast-math -fno-unsafe-math-optimizations -fomit-frame-pointer")
set(CMAKE_C_FLAGS_RELWITHDEBINFO "-g -O2 -ffast-math -fno-unsafe-math-optimizations -fomit-frame-pointer")
set(CMAKE_C_FLAGS_MINSIZEREL "-Os -ffast-math -fno-unsafe-math-optimizations -fomit-frame-pointer")
set(CMAKE_CXX_FLAGS_DEBUGALL ${CMAKE_C_FLAGS_DEBUGALL})