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Swap out -ffast-math for a safe subset of optimization flags (#9682)

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It caused more trouble than its worth.
fixes #3943, fixes #5330
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sfan5 2020-04-16 10:23:48 +02:00 committed by GitHub
parent e8ac5a31cf
commit 5cbe8437a8
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 9 additions and 1 deletions
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7
src/CMakeLists.txt
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@ -713,6 +713,11 @@ else()
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -DWIN32_LEAN_AND_MEAN")
endif()
# Use a safe subset of flags to speed up math calculations:
# - we don't need errno or math exceptions
# - we don't deal with Inf/NaN or signed zero
set(MATH_FLAGS "-fno-math-errno -fno-trapping-math -ffinite-math-only -fno-signed-zeros")
set(CMAKE_CXX_FLAGS_RELEASE "-DNDEBUG ${RELEASE_WARNING_FLAGS} ${WARNING_FLAGS} ${OTHER_FLAGS} -Wall -pipe -funroll-loops")
if(CMAKE_SYSTEM_NAME MATCHES "(Darwin|BSD|DragonFly)")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -Os")
@ -723,7 +728,7 @@ else()
AND CMAKE_CXX_COMPILER_VERSION MATCHES "^9\\.")
# Clang 9 has broken -ffast-math on glibc
else()
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} -ffast-math")
set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} ${MATH_FLAGS}")
endif()
endif(CMAKE_SYSTEM_NAME MATCHES "(Darwin|BSD|DragonFly)")
set(CMAKE_CXX_FLAGS_SEMIDEBUG "-g -O1 -Wall -Wabi ${WARNING_FLAGS} ${OTHER_FLAGS}")

3
src/collision.cpp
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@ -32,6 +32,9 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#include "util/timetaker.h"
#include "profiler.h"
#ifdef __FAST_MATH__
#warning "-ffast-math is known to cause bugs in collision code, do not use!"
#endif
struct NearbyCollisionInfo {
NearbyCollisionInfo(bool is_ul, bool is_obj, int bouncy,