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| author | William L. DeRieux IV <williamderieux@gmail.com> | 2021-12-28 08:06:24 -0500 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2021-12-28 14:06:24 +0100 |
| commit | cc64a0405ae0e4025f0b18be3bd0d813cb36fea0 (patch) | |
| tree | 03f1114bf2f17b4051faf5327e44ab774c0d7bd6 /src/CMakeLists.txt | |
| parent | 7f6306ca964ac5b9245c433e3b688c5d4ee08c35 (diff) | |
| download | hax-minetest-server-cc64a0405ae0e4025f0b18be3bd0d813cb36fea0.tar.gz hax-minetest-server-cc64a0405ae0e4025f0b18be3bd0d813cb36fea0.zip | |
Automatically use SSE registers for FP operations on i386 (#11853)
use SSE for floating-point operations to avoid issues with improper fp-rounding and
loss of precision when moving fp-data to incompatible or less-precise
registers/storage locations
https://gcc.gnu.org/wiki/FloatingPointMath
https://gcc.gnu.org/wiki/x87note
Diffstat (limited to 'src/CMakeLists.txt')
| -rw-r--r-- | src/CMakeLists.txt | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt index 4803b475b..e3389cea9 100644 --- a/src/CMakeLists.txt +++ b/src/CMakeLists.txt @@ -769,6 +769,16 @@ else() # - 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") + # Enable SSE for floating point math on 32-bit x86 by default + # reasoning see minetest issue #11810 and https://gcc.gnu.org/wiki/FloatingPointMath + if(CMAKE_SIZEOF_VOID_P EQUAL 4) + check_c_source_compiles("#ifndef __i686__\n#error\n#endif\nint main(){}" IS_I686) + if(IS_I686) + message(STATUS "Detected Intel x86: using SSE instead of x87 FPU") + set(OTHER_FLAGS "${OTHER_FLAGS} -mfpmath=sse -msse") + endif() + endif() + 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") |