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Merge pull request #328 from Raulshc/double2int

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Move double2int function
This commit is contained in:
kcat
2019-08-18 15:15:09 -07:00
committed by GitHub
parent c89fb550b6 550f1dce1f
commit 71ddb86047
2 changed files with 36 additions and 34 deletions
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alc/effects/pshifter.cpp
+1 -34
View File
@@ -34,6 +34,7 @@
#include "alcmain.h"
#include "alcomplex.h"
#include "alcontext.h"
#include "alnumeric.h"
#include "alu.h"
@@ -48,40 +49,6 @@ using complex_d = std::complex<double>;
#define STFT_STEP (STFT_SIZE / OVERSAMP)
#define FIFO_LATENCY (STFT_STEP * (OVERSAMP-1))
inline int double2int(double d)
{
#if defined(HAVE_SSE_INTRINSICS)
return _mm_cvttsd_si32(_mm_set_sd(d));
#elif ((defined(__GNUC__) || defined(__clang__)) && (defined(__i386__) || defined(__x86_64__)) && \
!defined(__SSE2_MATH__)) || (defined(_MSC_VER) && defined(_M_IX86_FP) && _M_IX86_FP < 2)
int sign, shift;
int64_t mant;
union {
double d;
int64_t i64;
} conv;
conv.d = d;
sign = (conv.i64>>63) | 1;
shift = ((conv.i64>>52)&0x7ff) - (1023+52);
/* Over/underflow */
if UNLIKELY(shift >= 63 || shift < -52)
return 0;
mant = (conv.i64&0xfffffffffffff_i64) | 0x10000000000000_i64;
if LIKELY(shift < 0)
return (int)(mant >> -shift) * sign;
return (int)(mant << shift) * sign;
#else
return static_cast<int>(d);
#endif
}
/* Define a Hann window, used to filter the STFT input and output. */
/* Making this constexpr seems to require C++14. */
std::array<ALdouble,STFT_SIZE> InitHannWindow()
common/alnumeric.h
+35
View File
@@ -250,6 +250,41 @@ inline int float2int(float f) noexcept
#endif
}
/** Converts double-to-int using standard behavior (truncation). */
inline int double2int(double d) noexcept
{
#if defined(HAVE_SSE_INTRINSICS)
return _mm_cvttsd_si32(_mm_set_sd(d));
#elif ((defined(__GNUC__) || defined(__clang__)) && (defined(__i386__) || defined(__x86_64__)) && \
!defined(__SSE2_MATH__)) || (defined(_MSC_VER) && defined(_M_IX86_FP) && _M_IX86_FP < 2)
int sign, shift;
int64_t mant;
union {
double d;
int64_t i64;
} conv;
conv.d = d;
sign = (conv.i64 >> 63) | 1;
shift = ((conv.i64 >> 52) & 0x7ff) - (1023 + 52);
/* Over/underflow */
if UNLIKELY(shift >= 63 || shift < -52)
return 0;
mant = (conv.i64 & 0xfffffffffffff_i64) | 0x10000000000000_i64;
if LIKELY(shift < 0)
return (int)(mant >> -shift) * sign;
return (int)(mant << shift) * sign;
#else
return static_cast<int>(d);
#endif
}
/**
* Rounds a float to the nearest integral value, according to the current
* rounding mode. This is essentially an inlined version of rintf, although