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Added disableDenormalisedNumberSupport to query if denormals are disabled and improved documentation

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This commit is contained in:
hogliux 2017-10-17 09:57:39 +01:00
parent bd9a8a8529
commit 2ac2a39a21
2 changed files with 28 additions and 8 deletions
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21
modules/juce_audio_basics/buffers/juce_FloatVectorOperations.cpp
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@ -1084,7 +1084,7 @@ void JUCE_CALLTYPE FloatVectorOperations::enableFlushToZeroMode (bool shouldEnab
#endif
}
void JUCE_CALLTYPE FloatVectorOperations::disableDenormalisedNumberSupport() noexcept
void JUCE_CALLTYPE FloatVectorOperations::disableDenormalisedNumberSupport (bool shouldDisable) noexcept
{
#if JUCE_USE_SSE_INTRINSICS || (JUCE_USE_ARM_NEON || defined (__arm64__) || defined (__aarch64__))
#if JUCE_USE_SSE_INTRINSICS
@ -1093,14 +1093,31 @@ void JUCE_CALLTYPE FloatVectorOperations::disableDenormalisedNumberSupport() noe
intptr_t mask = (1 << 24 /* FZ */);
#endif
setFpStatusRegister (getFpStatusRegister() | mask);
setFpStatusRegister ((getFpStatusRegister() & (~mask)) | (shouldDisable ? mask : 0));
#else
ignoreUnused (shouldDisable);
#if ! (defined (JUCE_INTEL) || defined (JUCE_ARM))
jassertfalse; // No support for disable denormals mode on your platform
#endif
#endif
}
bool JUCE_CALLTYPE FloatVectorOperations::areDenormalsDisabled() noexcept
{
#if JUCE_USE_SSE_INTRINSICS || (JUCE_USE_ARM_NEON || defined (__arm64__) || defined (__aarch64__))
#if JUCE_USE_SSE_INTRINSICS
intptr_t mask = 0x8040;
#else /*JUCE_USE_ARM_NEON*/
intptr_t mask = (1 << 24 /* FZ */);
#endif
return ((getFpStatusRegister() & mask) == mask);
#else
return false;
#endif
}
ScopedNoDenormals::ScopedNoDenormals() noexcept
{
#if JUCE_USE_SSE_INTRINSICS || (JUCE_USE_ARM_NEON || defined (__arm64__) || defined (__aarch64__))

15
modules/juce_audio_basics/buffers/juce_FloatVectorOperations.h
View file

@ -210,16 +210,19 @@ public:
/** Finds the maximum value in the given array. */
static double JUCE_CALLTYPE findMaximum (const double* src, int numValues) noexcept;
/** On Intel CPUs, this method enables or disables the SSE flush-to-zero mode.
Effectively, this is a wrapper around a call to _MM_SET_FLUSH_ZERO_MODE
*/
/** This method enables or disables the SSE/NEON flush-to-zero mode. */
static void JUCE_CALLTYPE enableFlushToZeroMode (bool shouldEnable) noexcept;
/** On Intel CPUs, this method enables the SSE flush-to-zero and denormalised-are-zero modes.
This effectively sets the DAZ and FZ bits of the MXCSR register. It's a convenient thing to
call before audio processing code where you really want to avoid denormalisation performance hits.
This effectively sets the DAZ and FZ bits of the MXCSR register. On arm CPUs this will
enable flush to zero mode.
It's a convenient thing to call before audio processing code where you really want to
avoid denormalisation performance hits.
*/
static void JUCE_CALLTYPE disableDenormalisedNumberSupport() noexcept;
static void JUCE_CALLTYPE disableDenormalisedNumberSupport (bool shouldDisable = true) noexcept;
/** This method returns true if denormals are currently disabled. */
static bool JUCE_CALLTYPE areDenormalsDisabled() noexcept;
private:
friend ScopedNoDenormals;