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softfloat: export some functions

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Move fpu/softfloat-macros.h to include/fpu/

Export floatx80 functions to be used by target floatx80
specific implementations.

Exports:
  propagateFloatx80NaN(), extractFloatx80Frac(),
  extractFloatx80Exp(), extractFloatx80Sign(),
  normalizeFloatx80Subnormal(), packFloatx80(),
  roundAndPackFloatx80(), normalizeRoundAndPackFloatx80()

Also exports packFloat32() that will be used to implement
m68k fsinh, fcos, fsin, ftan operations.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180224201802.911-2-laurent@vivier.eu>
This commit is contained in:
Laurent Vivier 2018-02-24 21:17:59 +01:00
parent 24989f0e21
commit 88857aca93
4 changed files with 137 additions and 88 deletions
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3
fpu/softfloat-specialize.h
View File

@ -1011,8 +1011,7 @@ static floatx80 commonNaNToFloatx80(commonNaNT a, float_status *status)
| `b' is a signaling NaN, the invalid exception is raised.
*----------------------------------------------------------------------------*/
static floatx80 propagateFloatx80NaN(floatx80 a, floatx80 b,
float_status *status)
floatx80 propagateFloatx80NaN(floatx80 a, floatx80 b, float_status *status)
{
flag aIsQuietNaN, aIsSignalingNaN, bIsQuietNaN, bIsSignalingNaN;
flag aIsLargerSignificand;

91
fpu/softfloat.c
View File

@ -93,7 +93,7 @@ this code that are retained.
| division and square root approximations. (Can be specialized to target if
| desired.)
*----------------------------------------------------------------------------*/
#include "softfloat-macros.h"
#include "fpu/softfloat-macros.h"
/*----------------------------------------------------------------------------
| Functions and definitions to determine: (1) whether tininess for underflow
@ -2192,25 +2192,6 @@ static void
}
/*----------------------------------------------------------------------------
| Packs the sign `zSign', exponent `zExp', and significand `zSig' into a
| single-precision floating-point value, returning the result. After being
| shifted into the proper positions, the three fields are simply added
| together to form the result. This means that any integer portion of `zSig'
| will be added into the exponent. Since a properly normalized significand
| will have an integer portion equal to 1, the `zExp' input should be 1 less
| than the desired result exponent whenever `zSig' is a complete, normalized
| significand.
*----------------------------------------------------------------------------*/
static inline float32 packFloat32(flag zSign, int zExp, uint32_t zSig)
{
return make_float32(
( ( (uint32_t) zSign )<<31 ) + ( ( (uint32_t) zExp )<<23 ) + zSig);
}
/*----------------------------------------------------------------------------
| Takes an abstract floating-point value having sign `zSign', exponent `zExp',
| and significand `zSig', and returns the proper single-precision floating-
@ -2490,42 +2471,6 @@ static float64
}
/*----------------------------------------------------------------------------
| Returns the fraction bits of the extended double-precision floating-point
| value `a'.
*----------------------------------------------------------------------------*/
static inline uint64_t extractFloatx80Frac( floatx80 a )
{
return a.low;
}
/*----------------------------------------------------------------------------
| Returns the exponent bits of the extended double-precision floating-point
| value `a'.
*----------------------------------------------------------------------------*/
static inline int32_t extractFloatx80Exp( floatx80 a )
{
return a.high & 0x7FFF;
}
/*----------------------------------------------------------------------------
| Returns the sign bit of the extended double-precision floating-point value
| `a'.
*----------------------------------------------------------------------------*/
static inline flag extractFloatx80Sign( floatx80 a )
{
return a.high>>15;
}
/*----------------------------------------------------------------------------
| Normalizes the subnormal extended double-precision floating-point value
| represented by the denormalized significand `aSig'. The normalized exponent
@ -2533,30 +2478,14 @@ static inline flag extractFloatx80Sign( floatx80 a )
| `zSigPtr', respectively.
*----------------------------------------------------------------------------*/
static void
normalizeFloatx80Subnormal( uint64_t aSig, int32_t *zExpPtr, uint64_t *zSigPtr )
void normalizeFloatx80Subnormal(uint64_t aSig, int32_t *zExpPtr,
uint64_t *zSigPtr)
{
int8_t shiftCount;
shiftCount = countLeadingZeros64( aSig );
*zSigPtr = aSig<<shiftCount;
*zExpPtr = 1 - shiftCount;
}
/*----------------------------------------------------------------------------
| Packs the sign `zSign', exponent `zExp', and significand `zSig' into an
| extended double-precision floating-point value, returning the result.
*----------------------------------------------------------------------------*/
static inline floatx80 packFloatx80( flag zSign, int32_t zExp, uint64_t zSig )
{
floatx80 z;
z.low = zSig;
z.high = ( ( (uint16_t) zSign )<<15 ) + zExp;
return z;
}
/*----------------------------------------------------------------------------
@ -2583,9 +2512,9 @@ static inline floatx80 packFloatx80( flag zSign, int32_t zExp, uint64_t zSig )
| Floating-Point Arithmetic.
*----------------------------------------------------------------------------*/
static floatx80 roundAndPackFloatx80(int8_t roundingPrecision, flag zSign,
int32_t zExp, uint64_t zSig0, uint64_t zSig1,
float_status *status)
floatx80 roundAndPackFloatx80(int8_t roundingPrecision, flag zSign,
int32_t zExp, uint64_t zSig0, uint64_t zSig1,
float_status *status)
{
int8_t roundingMode;
flag roundNearestEven, increment, isTiny;
@ -2779,10 +2708,10 @@ static floatx80 roundAndPackFloatx80(int8_t roundingPrecision, flag zSign,
| normalized.
*----------------------------------------------------------------------------*/
static floatx80 normalizeRoundAndPackFloatx80(int8_t roundingPrecision,
flag zSign, int32_t zExp,
uint64_t zSig0, uint64_t zSig1,
float_status *status)
floatx80 normalizeRoundAndPackFloatx80(int8_t roundingPrecision,
flag zSign, int32_t zExp,
uint64_t zSig0, uint64_t zSig1,
float_status *status)
{
int8_t shiftCount;

10
fpu/softfloat-macros.h → include/fpu/softfloat-macros.h
View File

@ -603,7 +603,7 @@ static inline void
| unsigned integer is returned.
*----------------------------------------------------------------------------*/
static uint64_t estimateDiv128To64( uint64_t a0, uint64_t a1, uint64_t b )
static inline uint64_t estimateDiv128To64(uint64_t a0, uint64_t a1, uint64_t b)
{
uint64_t b0, b1;
uint64_t rem0, rem1, term0, term1;
@ -630,7 +630,7 @@ static uint64_t estimateDiv128To64( uint64_t a0, uint64_t a1, uint64_t b )
*
* Licensed under the GPLv2/LGPLv3
*/
static uint64_t div128To64(uint64_t n0, uint64_t n1, uint64_t d)
static inline uint64_t div128To64(uint64_t n0, uint64_t n1, uint64_t d)
{
uint64_t d0, d1, q0, q1, r1, r0, m;
@ -683,7 +683,7 @@ static uint64_t div128To64(uint64_t n0, uint64_t n1, uint64_t d)
| value.
*----------------------------------------------------------------------------*/
static uint32_t estimateSqrt32(int aExp, uint32_t a)
static inline uint32_t estimateSqrt32(int aExp, uint32_t a)
{
static const uint16_t sqrtOddAdjustments[] = {
0x0004, 0x0022, 0x005D, 0x00B1, 0x011D, 0x019F, 0x0236, 0x02E0,
@ -717,7 +717,7 @@ static uint32_t estimateSqrt32(int aExp, uint32_t a)
| `a'. If `a' is zero, 32 is returned.
*----------------------------------------------------------------------------*/
static int8_t countLeadingZeros32( uint32_t a )
static inline int8_t countLeadingZeros32(uint32_t a)
{
#if SOFTFLOAT_GNUC_PREREQ(3, 4)
if (a) {
@ -765,7 +765,7 @@ static int8_t countLeadingZeros32( uint32_t a )
| `a'. If `a' is zero, 64 is returned.
*----------------------------------------------------------------------------*/
static int8_t countLeadingZeros64( uint64_t a )
static inline int8_t countLeadingZeros64(uint64_t a)
{
#if SOFTFLOAT_GNUC_PREREQ(3, 4)
if (a) {

121
include/fpu/softfloat.h
View File

@ -425,6 +425,23 @@ static inline float32 float32_set_sign(float32 a, int sign)
#define float32_three make_float32(0x40400000)
#define float32_infinity make_float32(0x7f800000)
/*----------------------------------------------------------------------------
| Packs the sign `zSign', exponent `zExp', and significand `zSig' into a
| single-precision floating-point value, returning the result. After being
| shifted into the proper positions, the three fields are simply added
| together to form the result. This means that any integer portion of `zSig'
| will be added into the exponent. Since a properly normalized significand
| will have an integer portion equal to 1, the `zExp' input should be 1 less
| than the desired result exponent whenever `zSig' is a complete, normalized
| significand.
*----------------------------------------------------------------------------*/
static inline float32 packFloat32(flag zSign, int zExp, uint32_t zSig)
{
return make_float32(
(((uint32_t)zSign) << 31) + (((uint32_t)zExp) << 23) + zSig);
}
/*----------------------------------------------------------------------------
| The pattern for a default generated single-precision NaN.
*----------------------------------------------------------------------------*/
@ -640,6 +657,110 @@ static inline bool floatx80_invalid_encoding(floatx80 a)
#define floatx80_half make_floatx80(0x3ffe, 0x8000000000000000LL)
#define floatx80_infinity make_floatx80(0x7fff, 0x8000000000000000LL)
/*----------------------------------------------------------------------------
| Returns the fraction bits of the extended double-precision floating-point
| value `a'.
*----------------------------------------------------------------------------*/
static inline uint64_t extractFloatx80Frac(floatx80 a)
{
return a.low;
}
/*----------------------------------------------------------------------------
| Returns the exponent bits of the extended double-precision floating-point
| value `a'.
*----------------------------------------------------------------------------*/
static inline int32_t extractFloatx80Exp(floatx80 a)
{
return a.high & 0x7FFF;
}
/*----------------------------------------------------------------------------
| Returns the sign bit of the extended double-precision floating-point value
| `a'.
*----------------------------------------------------------------------------*/
static inline flag extractFloatx80Sign(floatx80 a)
{
return a.high >> 15;
}
/*----------------------------------------------------------------------------
| Packs the sign `zSign', exponent `zExp', and significand `zSig' into an
| extended double-precision floating-point value, returning the result.
*----------------------------------------------------------------------------*/
static inline floatx80 packFloatx80(flag zSign, int32_t zExp, uint64_t zSig)
{
floatx80 z;
z.low = zSig;
z.high = (((uint16_t)zSign) << 15) + zExp;
return z;
}
/*----------------------------------------------------------------------------
| Normalizes the subnormal extended double-precision floating-point value
| represented by the denormalized significand `aSig'. The normalized exponent
| and significand are stored at the locations pointed to by `zExpPtr' and
| `zSigPtr', respectively.
*----------------------------------------------------------------------------*/
void normalizeFloatx80Subnormal(uint64_t aSig, int32_t *zExpPtr,
uint64_t *zSigPtr);
/*----------------------------------------------------------------------------
| Takes two extended double-precision floating-point values `a' and `b', one
| of which is a NaN, and returns the appropriate NaN result. If either `a' or
| `b' is a signaling NaN, the invalid exception is raised.
*----------------------------------------------------------------------------*/
floatx80 propagateFloatx80NaN(floatx80 a, floatx80 b, float_status *status);
/*----------------------------------------------------------------------------
| Takes an abstract floating-point value having sign `zSign', exponent `zExp',
| and extended significand formed by the concatenation of `zSig0' and `zSig1',
| and returns the proper extended double-precision floating-point value
| corresponding to the abstract input. Ordinarily, the abstract value is
| rounded and packed into the extended double-precision format, with the
| inexact exception raised if the abstract input cannot be represented
| exactly. However, if the abstract value is too large, the overflow and
| inexact exceptions are raised and an infinity or maximal finite value is
| returned. If the abstract value is too small, the input value is rounded to
| a subnormal number, and the underflow and inexact exceptions are raised if
| the abstract input cannot be represented exactly as a subnormal extended
| double-precision floating-point number.
| If `roundingPrecision' is 32 or 64, the result is rounded to the same
| number of bits as single or double precision, respectively. Otherwise, the
| result is rounded to the full precision of the extended double-precision
| format.
| The input significand must be normalized or smaller. If the input
| significand is not normalized, `zExp' must be 0; in that case, the result
| returned is a subnormal number, and it must not require rounding. The
| handling of underflow and overflow follows the IEC/IEEE Standard for Binary
| Floating-Point Arithmetic.
*----------------------------------------------------------------------------*/
floatx80 roundAndPackFloatx80(int8_t roundingPrecision, flag zSign,
int32_t zExp, uint64_t zSig0, uint64_t zSig1,
float_status *status);
/*----------------------------------------------------------------------------
| Takes an abstract floating-point value having sign `zSign', exponent
| `zExp', and significand formed by the concatenation of `zSig0' and `zSig1',
| and returns the proper extended double-precision floating-point value
| corresponding to the abstract input. This routine is just like
| `roundAndPackFloatx80' except that the input significand does not have to be
| normalized.
*----------------------------------------------------------------------------*/
floatx80 normalizeRoundAndPackFloatx80(int8_t roundingPrecision,
flag zSign, int32_t zExp,
uint64_t zSig0, uint64_t zSig1,
float_status *status);
/*----------------------------------------------------------------------------
| The pattern for a default generated extended double-precision NaN.
*----------------------------------------------------------------------------*/