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Commit fd9e3452 removed -ffast-math from the compile flags. Under some

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conditions this may lead to massive slowdown of floating point operations
when underflows or denormals are encountered. In particular, this problem
was observed with the soxr resampler after applying
https://gitlab.freedesktop.org/pulseaudio/pulseaudio/merge_requests/120

Therefore this patch adds -ffast-math to the link flags of the pulseaudio
daemon. Linking with -ffast-math adds a procedure set_fast_math() to the
startup code of the daemon. On x86, the procedure sets bit 6 and 15 of the
mxcsr register. When these bits are set, denormals and results of
underflowing operations are truncated to 0.
This commit is contained in:
Georg Chini 2019-07-21 15:07:18 +02:00 • committed by Arun Raghavan
parent e896fdc080
commit 3929798a53
2 changed files with 3 additions and 2 deletions
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4
src/Makefile.am
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@ -175,9 +175,9 @@ PREOPEN_LIBS = $(modlibexec_LTLIBRARIES)
endif
if FORCE_PREOPEN
pulseaudio_LDFLAGS = $(AM_LDFLAGS) $(BINLDFLAGS) $(IMMEDIATE_LDFLAGS) -dlpreopen force $(foreach f,$(PREOPEN_LIBS),-dlpreopen $(f))
pulseaudio_LDFLAGS = $(AM_LDFLAGS) $(BINLDFLAGS) $(IMMEDIATE_LDFLAGS) -ffast-math -dlpreopen force $(foreach f,$(PREOPEN_LIBS),-dlpreopen $(f))
else
pulseaudio_LDFLAGS = $(AM_LDFLAGS) $(BINLDFLAGS) $(IMMEDIATE_LDFLAGS) -dlopen force $(foreach f,$(PREOPEN_LIBS),-dlopen $(f))
pulseaudio_LDFLAGS = $(AM_LDFLAGS) $(BINLDFLAGS) $(IMMEDIATE_LDFLAGS) -ffast-math -dlopen force $(foreach f,$(PREOPEN_LIBS),-dlopen $(f))
endif
if HAVE_SYSTEMD_DAEMON

1
src/daemon/meson.build
View file

@ -28,6 +28,7 @@ executable('pulseaudio',
pulseaudio_headers,
install: true,
include_directories : [configinc, topinc],
link_args : ['-ffast-math'],
link_with : [libpulsecore, libpulsecommon, libpulse],
dependencies : [ltdl_dep, cap_dep, dbus_dep, libsystemd_dep],
c_args : pa_c_args,