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Don't use -ffast-math or other unsafe math optimizations

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Godot supports many different compilers and for production releases we
have to support 3 currently: GCC8, Clang6, and MSVC2017. These compilers
all do slightly different things with -ffast-math and it is causing
issues now. See #24841, #24540, #10758, #10070. And probably other
complaints about physics differences between release and release_debug
builds.

I've done some performance comparisons on Linux x86_64. All tests are
ran 20 times.

Bunnymark: (higher is better)
(bunnies)    min    max  stdev average
fast-math   7332   7597    71     7432
this pr     7379   7779   108     7621 (102%)

FPBench (gdscript port http://fpbench.org/) (lower is better)
(ms)
fast-math  15441  16127   192    15764
this pr    15671  16855   326    16001  (99%)

Float_add (adding floats in a tight loop) (lower is better)
(sec)
fast-math   5.49   5.78  0.07     5.65
this pr     5.65   5.90  0.06     5.76  (98%)

Float_div (dividing floats in a tight loop) (lower is better)
(sec)
fast-math  11.70  12.36  0.18    11.99
this pr    11.92  12.32  0.12    12.12  (99%)

Float_mul (multiplying floats in a tight loop) (lower is better)
(sec)
fast-math  11.72  12.17  0.12    11.93
this pr    12.01  12.62  0.17    12.26  (97%)

I have also looked at FPS numbers for tps-demo, 3d platformer, 2d
platformer, and sponza and could not find any measurable difference.

I believe that given the issues and oft-reported (physics) glitches on
release builds I believe that the couple of percent of tight-loop
floating point performance regression is well worth it.

This fixes #24540 and fixes #24841
This commit is contained in:
Hein-Pieter van Braam
2019-01-09 01:09:56 +01:00
parent e46f28e02d
commit e5b335d367
7 changed files with 9 additions and 16 deletions
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5
modules/etc/SCsub
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@@ -33,11 +33,6 @@ env_etc.Append(CPPPATH=[thirdparty_dir])
if not env.msvc:
env_etc.Append(CCFLAGS="-std=c++11")
# -ffast-math seems to be incompatible with etc2comp on recent versions of
# GCC and Clang
if '-ffast-math' in env_etc['CCFLAGS']:
env_etc['CCFLAGS'].remove('-ffast-math')
env_thirdparty = env_etc.Clone()
env_thirdparty.disable_warnings()
env_thirdparty.add_source_files(env.modules_sources, thirdparty_sources)