On Mon, Jan 03, 2011 at 04:48:53PM +0000, Peter Maydell wrote:
> Add support to softfloat for flushing input denormal float32 and float64
> to zero. softfloat's existing 'flush_to_zero' flag only flushes denormals
> to zero on output. Some CPUs need input denormals to be flushed before
> processing as well. Implement this, using a new status flag to enable it
> and a new exception status bit to indicate when it has happened. Existing
> CPUs should be unaffected as there is no behaviour change unless the
> mode is enabled.
>
> Signed-off-by: Peter Maydell <peter.mayd...@linaro.org>
Acked-by: Aurelien Jarno <aurel...@aurel32.net>
> ---
> fpu/softfloat.c | 104 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
> fpu/softfloat.h | 22 +++++++++++-
> 2 files changed, 123 insertions(+), 3 deletions(-)
>
> diff --git a/fpu/softfloat.c b/fpu/softfloat.c
> index 6f5b05d..17842f4 100644
> --- a/fpu/softfloat.c
> +++ b/fpu/softfloat.c
> @@ -30,8 +30,6 @@ these four paragraphs for those parts of this code that are
> retained.
>
>
> =============================================================================*/
>
> -/* FIXME: Flush-To-Zero only effects results. Denormal inputs should also
> - be flushed to zero. */
> #include "softfloat.h"
>
>
> /*----------------------------------------------------------------------------
> @@ -204,6 +202,21 @@ INLINE flag extractFloat32Sign( float32 a )
> }
>
>
> /*----------------------------------------------------------------------------
> +| If `a' is denormal and we are in flush-to-zero mode then set the
> +| input-denormal exception and return zero. Otherwise just return the value.
> +*----------------------------------------------------------------------------*/
> +static float32 float32_squash_input_denormal(float32 a STATUS_PARAM)
> +{
> + if (STATUS(flush_inputs_to_zero)) {
> + if (extractFloat32Exp(a) == 0 && extractFloat32Frac(a) != 0) {
> + float_raise(float_flag_input_denormal STATUS_VAR);
> + return make_float32(float32_val(a) & 0x80000000);
> + }
> + }
> + return a;
> +}
> +
> +/*----------------------------------------------------------------------------
> | Normalizes the subnormal single-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
> @@ -368,6 +381,21 @@ INLINE flag extractFloat64Sign( float64 a )
> }
>
>
> /*----------------------------------------------------------------------------
> +| If `a' is denormal and we are in flush-to-zero mode then set the
> +| input-denormal exception and return zero. Otherwise just return the value.
> +*----------------------------------------------------------------------------*/
> +static float64 float64_squash_input_denormal(float64 a STATUS_PARAM)
> +{
> + if (STATUS(flush_inputs_to_zero)) {
> + if (extractFloat64Exp(a) == 0 && extractFloat64Frac(a) != 0) {
> + float_raise(float_flag_input_denormal STATUS_VAR);
> + return make_float64(float64_val(a) & (1ULL << 63));
> + }
> + }
> + return a;
> +}
> +
> +/*----------------------------------------------------------------------------
> | Normalizes the subnormal 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
> @@ -1298,6 +1326,7 @@ int32 float32_to_int32( float32 a STATUS_PARAM )
> bits32 aSig;
> bits64 aSig64;
>
> + a = float32_squash_input_denormal(a STATUS_VAR);
> aSig = extractFloat32Frac( a );
> aExp = extractFloat32Exp( a );
> aSign = extractFloat32Sign( a );
> @@ -1327,6 +1356,7 @@ int32 float32_to_int32_round_to_zero( float32 a
> STATUS_PARAM )
> int16 aExp, shiftCount;
> bits32 aSig;
> int32 z;
> + a = float32_squash_input_denormal(a STATUS_VAR);
>
> aSig = extractFloat32Frac( a );
> aExp = extractFloat32Exp( a );
> @@ -1418,6 +1448,7 @@ int64 float32_to_int64( float32 a STATUS_PARAM )
> int16 aExp, shiftCount;
> bits32 aSig;
> bits64 aSig64, aSigExtra;
> + a = float32_squash_input_denormal(a STATUS_VAR);
>
> aSig = extractFloat32Frac( a );
> aExp = extractFloat32Exp( a );
> @@ -1455,6 +1486,7 @@ int64 float32_to_int64_round_to_zero( float32 a
> STATUS_PARAM )
> bits32 aSig;
> bits64 aSig64;
> int64 z;
> + a = float32_squash_input_denormal(a STATUS_VAR);
>
> aSig = extractFloat32Frac( a );
> aExp = extractFloat32Exp( a );
> @@ -1496,6 +1528,7 @@ float64 float32_to_float64( float32 a STATUS_PARAM )
> flag aSign;
> int16 aExp;
> bits32 aSig;
> + a = float32_squash_input_denormal(a STATUS_VAR);
>
> aSig = extractFloat32Frac( a );
> aExp = extractFloat32Exp( a );
> @@ -1528,6 +1561,7 @@ floatx80 float32_to_floatx80( float32 a STATUS_PARAM )
> int16 aExp;
> bits32 aSig;
>
> + a = float32_squash_input_denormal(a STATUS_VAR);
> aSig = extractFloat32Frac( a );
> aExp = extractFloat32Exp( a );
> aSign = extractFloat32Sign( a );
> @@ -1561,6 +1595,7 @@ float128 float32_to_float128( float32 a STATUS_PARAM )
> int16 aExp;
> bits32 aSig;
>
> + a = float32_squash_input_denormal(a STATUS_VAR);
> aSig = extractFloat32Frac( a );
> aExp = extractFloat32Exp( a );
> aSign = extractFloat32Sign( a );
> @@ -1593,6 +1628,7 @@ float32 float32_round_to_int( float32 a STATUS_PARAM)
> bits32 lastBitMask, roundBitsMask;
> int8 roundingMode;
> bits32 z;
> + a = float32_squash_input_denormal(a STATUS_VAR);
>
> aExp = extractFloat32Exp( a );
> if ( 0x96 <= aExp ) {
> @@ -1796,6 +1832,8 @@ static float32 subFloat32Sigs( float32 a, float32 b,
> flag zSign STATUS_PARAM)
> float32 float32_add( float32 a, float32 b STATUS_PARAM )
> {
> flag aSign, bSign;
> + a = float32_squash_input_denormal(a STATUS_VAR);
> + b = float32_squash_input_denormal(b STATUS_VAR);
>
> aSign = extractFloat32Sign( a );
> bSign = extractFloat32Sign( b );
> @@ -1817,6 +1855,8 @@ float32 float32_add( float32 a, float32 b STATUS_PARAM )
> float32 float32_sub( float32 a, float32 b STATUS_PARAM )
> {
> flag aSign, bSign;
> + a = float32_squash_input_denormal(a STATUS_VAR);
> + b = float32_squash_input_denormal(b STATUS_VAR);
>
> aSign = extractFloat32Sign( a );
> bSign = extractFloat32Sign( b );
> @@ -1843,6 +1883,9 @@ float32 float32_mul( float32 a, float32 b STATUS_PARAM )
> bits64 zSig64;
> bits32 zSig;
>
> + a = float32_squash_input_denormal(a STATUS_VAR);
> + b = float32_squash_input_denormal(b STATUS_VAR);
> +
> aSig = extractFloat32Frac( a );
> aExp = extractFloat32Exp( a );
> aSign = extractFloat32Sign( a );
> @@ -1900,6 +1943,8 @@ float32 float32_div( float32 a, float32 b STATUS_PARAM )
> flag aSign, bSign, zSign;
> int16 aExp, bExp, zExp;
> bits32 aSig, bSig, zSig;
> + a = float32_squash_input_denormal(a STATUS_VAR);
> + b = float32_squash_input_denormal(b STATUS_VAR);
>
> aSig = extractFloat32Frac( a );
> aExp = extractFloat32Exp( a );
> @@ -1966,6 +2011,8 @@ float32 float32_rem( float32 a, float32 b STATUS_PARAM )
> bits64 aSig64, bSig64, q64;
> bits32 alternateASig;
> sbits32 sigMean;
> + a = float32_squash_input_denormal(a STATUS_VAR);
> + b = float32_squash_input_denormal(b STATUS_VAR);
>
> aSig = extractFloat32Frac( a );
> aExp = extractFloat32Exp( a );
> @@ -2062,6 +2109,7 @@ float32 float32_sqrt( float32 a STATUS_PARAM )
> int16 aExp, zExp;
> bits32 aSig, zSig;
> bits64 rem, term;
> + a = float32_squash_input_denormal(a STATUS_VAR);
>
> aSig = extractFloat32Frac( a );
> aExp = extractFloat32Exp( a );
> @@ -2148,6 +2196,7 @@ float32 float32_exp2( float32 a STATUS_PARAM )
> bits32 aSig;
> float64 r, x, xn;
> int i;
> + a = float32_squash_input_denormal(a STATUS_VAR);
>
> aSig = extractFloat32Frac( a );
> aExp = extractFloat32Exp( a );
> @@ -2194,6 +2243,7 @@ float32 float32_log2( float32 a STATUS_PARAM )
> int16 aExp;
> bits32 aSig, zSig, i;
>
> + a = float32_squash_input_denormal(a STATUS_VAR);
> aSig = extractFloat32Frac( a );
> aExp = extractFloat32Exp( a );
> aSign = extractFloat32Sign( a );
> @@ -2238,6 +2288,8 @@ float32 float32_log2( float32 a STATUS_PARAM )
>
> int float32_eq( float32 a, float32 b STATUS_PARAM )
> {
> + a = float32_squash_input_denormal(a STATUS_VAR);
> + b = float32_squash_input_denormal(b STATUS_VAR);
>
> if ( ( ( extractFloat32Exp( a ) == 0xFF ) && extractFloat32Frac( a ) )
> || ( ( extractFloat32Exp( b ) == 0xFF ) && extractFloat32Frac( b ) )
> @@ -2263,6 +2315,8 @@ int float32_le( float32 a, float32 b STATUS_PARAM )
> {
> flag aSign, bSign;
> bits32 av, bv;
> + a = float32_squash_input_denormal(a STATUS_VAR);
> + b = float32_squash_input_denormal(b STATUS_VAR);
>
> if ( ( ( extractFloat32Exp( a ) == 0xFF ) && extractFloat32Frac( a ) )
> || ( ( extractFloat32Exp( b ) == 0xFF ) && extractFloat32Frac( b ) )
> @@ -2289,6 +2343,8 @@ int float32_lt( float32 a, float32 b STATUS_PARAM )
> {
> flag aSign, bSign;
> bits32 av, bv;
> + a = float32_squash_input_denormal(a STATUS_VAR);
> + b = float32_squash_input_denormal(b STATUS_VAR);
>
> if ( ( ( extractFloat32Exp( a ) == 0xFF ) && extractFloat32Frac( a ) )
> || ( ( extractFloat32Exp( b ) == 0xFF ) && extractFloat32Frac( b ) )
> @@ -2315,6 +2371,8 @@ int float32_lt( float32 a, float32 b STATUS_PARAM )
> int float32_eq_signaling( float32 a, float32 b STATUS_PARAM )
> {
> bits32 av, bv;
> + a = float32_squash_input_denormal(a STATUS_VAR);
> + b = float32_squash_input_denormal(b STATUS_VAR);
>
> if ( ( ( extractFloat32Exp( a ) == 0xFF ) && extractFloat32Frac( a ) )
> || ( ( extractFloat32Exp( b ) == 0xFF ) && extractFloat32Frac( b ) )
> @@ -2339,6 +2397,8 @@ int float32_le_quiet( float32 a, float32 b STATUS_PARAM
> )
> {
> flag aSign, bSign;
> bits32 av, bv;
> + a = float32_squash_input_denormal(a STATUS_VAR);
> + b = float32_squash_input_denormal(b STATUS_VAR);
>
> if ( ( ( extractFloat32Exp( a ) == 0xFF ) && extractFloat32Frac( a ) )
> || ( ( extractFloat32Exp( b ) == 0xFF ) && extractFloat32Frac( b ) )
> @@ -2368,6 +2428,8 @@ int float32_lt_quiet( float32 a, float32 b STATUS_PARAM
> )
> {
> flag aSign, bSign;
> bits32 av, bv;
> + a = float32_squash_input_denormal(a STATUS_VAR);
> + b = float32_squash_input_denormal(b STATUS_VAR);
>
> if ( ( ( extractFloat32Exp( a ) == 0xFF ) && extractFloat32Frac( a ) )
> || ( ( extractFloat32Exp( b ) == 0xFF ) && extractFloat32Frac( b ) )
> @@ -2401,6 +2463,7 @@ int32 float64_to_int32( float64 a STATUS_PARAM )
> flag aSign;
> int16 aExp, shiftCount;
> bits64 aSig;
> + a = float64_squash_input_denormal(a STATUS_VAR);
>
> aSig = extractFloat64Frac( a );
> aExp = extractFloat64Exp( a );
> @@ -2429,6 +2492,7 @@ int32 float64_to_int32_round_to_zero( float64 a
> STATUS_PARAM )
> int16 aExp, shiftCount;
> bits64 aSig, savedASig;
> int32 z;
> + a = float64_squash_input_denormal(a STATUS_VAR);
>
> aSig = extractFloat64Frac( a );
> aExp = extractFloat64Exp( a );
> @@ -2525,6 +2589,7 @@ int64 float64_to_int64( float64 a STATUS_PARAM )
> flag aSign;
> int16 aExp, shiftCount;
> bits64 aSig, aSigExtra;
> + a = float64_squash_input_denormal(a STATUS_VAR);
>
> aSig = extractFloat64Frac( a );
> aExp = extractFloat64Exp( a );
> @@ -2568,6 +2633,7 @@ int64 float64_to_int64_round_to_zero( float64 a
> STATUS_PARAM )
> int16 aExp, shiftCount;
> bits64 aSig;
> int64 z;
> + a = float64_squash_input_denormal(a STATUS_VAR);
>
> aSig = extractFloat64Frac( a );
> aExp = extractFloat64Exp( a );
> @@ -2617,6 +2683,7 @@ float32 float64_to_float32( float64 a STATUS_PARAM )
> int16 aExp;
> bits64 aSig;
> bits32 zSig;
> + a = float64_squash_input_denormal(a STATUS_VAR);
>
> aSig = extractFloat64Frac( a );
> aExp = extractFloat64Exp( a );
> @@ -2694,6 +2761,7 @@ bits16 float32_to_float16( float32 a, flag ieee
> STATUS_PARAM)
> bits32 mask;
> bits32 increment;
> int8 roundingMode;
> + a = float32_squash_input_denormal(a STATUS_VAR);
>
> aSig = extractFloat32Frac( a );
> aExp = extractFloat32Exp( a );
> @@ -2788,6 +2856,7 @@ floatx80 float64_to_floatx80( float64 a STATUS_PARAM )
> int16 aExp;
> bits64 aSig;
>
> + a = float64_squash_input_denormal(a STATUS_VAR);
> aSig = extractFloat64Frac( a );
> aExp = extractFloat64Exp( a );
> aSign = extractFloat64Sign( a );
> @@ -2822,6 +2891,7 @@ float128 float64_to_float128( float64 a STATUS_PARAM )
> int16 aExp;
> bits64 aSig, zSig0, zSig1;
>
> + a = float64_squash_input_denormal(a STATUS_VAR);
> aSig = extractFloat64Frac( a );
> aExp = extractFloat64Exp( a );
> aSign = extractFloat64Sign( a );
> @@ -2855,6 +2925,7 @@ float64 float64_round_to_int( float64 a STATUS_PARAM )
> bits64 lastBitMask, roundBitsMask;
> int8 roundingMode;
> bits64 z;
> + a = float64_squash_input_denormal(a STATUS_VAR);
>
> aExp = extractFloat64Exp( a );
> if ( 0x433 <= aExp ) {
> @@ -3071,6 +3142,8 @@ static float64 subFloat64Sigs( float64 a, float64 b,
> flag zSign STATUS_PARAM )
> float64 float64_add( float64 a, float64 b STATUS_PARAM )
> {
> flag aSign, bSign;
> + a = float64_squash_input_denormal(a STATUS_VAR);
> + b = float64_squash_input_denormal(b STATUS_VAR);
>
> aSign = extractFloat64Sign( a );
> bSign = extractFloat64Sign( b );
> @@ -3092,6 +3165,8 @@ float64 float64_add( float64 a, float64 b STATUS_PARAM )
> float64 float64_sub( float64 a, float64 b STATUS_PARAM )
> {
> flag aSign, bSign;
> + a = float64_squash_input_denormal(a STATUS_VAR);
> + b = float64_squash_input_denormal(b STATUS_VAR);
>
> aSign = extractFloat64Sign( a );
> bSign = extractFloat64Sign( b );
> @@ -3116,6 +3191,9 @@ float64 float64_mul( float64 a, float64 b STATUS_PARAM )
> int16 aExp, bExp, zExp;
> bits64 aSig, bSig, zSig0, zSig1;
>
> + a = float64_squash_input_denormal(a STATUS_VAR);
> + b = float64_squash_input_denormal(b STATUS_VAR);
> +
> aSig = extractFloat64Frac( a );
> aExp = extractFloat64Exp( a );
> aSign = extractFloat64Sign( a );
> @@ -3175,6 +3253,8 @@ float64 float64_div( float64 a, float64 b STATUS_PARAM )
> bits64 aSig, bSig, zSig;
> bits64 rem0, rem1;
> bits64 term0, term1;
> + a = float64_squash_input_denormal(a STATUS_VAR);
> + b = float64_squash_input_denormal(b STATUS_VAR);
>
> aSig = extractFloat64Frac( a );
> aExp = extractFloat64Exp( a );
> @@ -3246,6 +3326,8 @@ float64 float64_rem( float64 a, float64 b STATUS_PARAM )
> bits64 q, alternateASig;
> sbits64 sigMean;
>
> + a = float64_squash_input_denormal(a STATUS_VAR);
> + b = float64_squash_input_denormal(b STATUS_VAR);
> aSig = extractFloat64Frac( a );
> aExp = extractFloat64Exp( a );
> aSign = extractFloat64Sign( a );
> @@ -3328,6 +3410,7 @@ float64 float64_sqrt( float64 a STATUS_PARAM )
> int16 aExp, zExp;
> bits64 aSig, zSig, doubleZSig;
> bits64 rem0, rem1, term0, term1;
> + a = float64_squash_input_denormal(a STATUS_VAR);
>
> aSig = extractFloat64Frac( a );
> aExp = extractFloat64Exp( a );
> @@ -3377,6 +3460,7 @@ float64 float64_log2( float64 a STATUS_PARAM )
> flag aSign, zSign;
> int16 aExp;
> bits64 aSig, aSig0, aSig1, zSig, i;
> + a = float64_squash_input_denormal(a STATUS_VAR);
>
> aSig = extractFloat64Frac( a );
> aExp = extractFloat64Exp( a );
> @@ -3422,6 +3506,8 @@ float64 float64_log2( float64 a STATUS_PARAM )
> int float64_eq( float64 a, float64 b STATUS_PARAM )
> {
> bits64 av, bv;
> + a = float64_squash_input_denormal(a STATUS_VAR);
> + b = float64_squash_input_denormal(b STATUS_VAR);
>
> if ( ( ( extractFloat64Exp( a ) == 0x7FF ) && extractFloat64Frac( a )
> )
> || ( ( extractFloat64Exp( b ) == 0x7FF ) && extractFloat64Frac( b )
> )
> @@ -3448,6 +3534,8 @@ int float64_le( float64 a, float64 b STATUS_PARAM )
> {
> flag aSign, bSign;
> bits64 av, bv;
> + a = float64_squash_input_denormal(a STATUS_VAR);
> + b = float64_squash_input_denormal(b STATUS_VAR);
>
> if ( ( ( extractFloat64Exp( a ) == 0x7FF ) && extractFloat64Frac( a )
> )
> || ( ( extractFloat64Exp( b ) == 0x7FF ) && extractFloat64Frac( b )
> )
> @@ -3475,6 +3563,8 @@ int float64_lt( float64 a, float64 b STATUS_PARAM )
> flag aSign, bSign;
> bits64 av, bv;
>
> + a = float64_squash_input_denormal(a STATUS_VAR);
> + b = float64_squash_input_denormal(b STATUS_VAR);
> if ( ( ( extractFloat64Exp( a ) == 0x7FF ) && extractFloat64Frac( a )
> )
> || ( ( extractFloat64Exp( b ) == 0x7FF ) && extractFloat64Frac( b )
> )
> ) {
> @@ -3500,6 +3590,8 @@ int float64_lt( float64 a, float64 b STATUS_PARAM )
> int float64_eq_signaling( float64 a, float64 b STATUS_PARAM )
> {
> bits64 av, bv;
> + a = float64_squash_input_denormal(a STATUS_VAR);
> + b = float64_squash_input_denormal(b STATUS_VAR);
>
> if ( ( ( extractFloat64Exp( a ) == 0x7FF ) && extractFloat64Frac( a )
> )
> || ( ( extractFloat64Exp( b ) == 0x7FF ) && extractFloat64Frac( b )
> )
> @@ -3524,6 +3616,8 @@ int float64_le_quiet( float64 a, float64 b STATUS_PARAM
> )
> {
> flag aSign, bSign;
> bits64 av, bv;
> + a = float64_squash_input_denormal(a STATUS_VAR);
> + b = float64_squash_input_denormal(b STATUS_VAR);
>
> if ( ( ( extractFloat64Exp( a ) == 0x7FF ) && extractFloat64Frac( a )
> )
> || ( ( extractFloat64Exp( b ) == 0x7FF ) && extractFloat64Frac( b )
> )
> @@ -3553,6 +3647,8 @@ int float64_lt_quiet( float64 a, float64 b STATUS_PARAM
> )
> {
> flag aSign, bSign;
> bits64 av, bv;
> + a = float64_squash_input_denormal(a STATUS_VAR);
> + b = float64_squash_input_denormal(b STATUS_VAR);
>
> if ( ( ( extractFloat64Exp( a ) == 0x7FF ) && extractFloat64Frac( a )
> )
> || ( ( extractFloat64Exp( b ) == 0x7FF ) && extractFloat64Frac( b )
> )
> @@ -5833,6 +5929,8 @@ INLINE int float ## s ## _compare_internal( float ## s
> a, float ## s b, \
> {
> \
> flag aSign, bSign;
> \
> bits ## s av, bv;
> \
> + a = float ## s ## _squash_input_denormal(a STATUS_VAR);
> \
> + b = float ## s ## _squash_input_denormal(b STATUS_VAR);
> \
>
> \
> if (( ( extractFloat ## s ## Exp( a ) == nan_exp ) &&
> \
> extractFloat ## s ## Frac( a ) ) ||
> \
> @@ -5929,6 +6027,7 @@ float32 float32_scalbn( float32 a, int n STATUS_PARAM )
> int16 aExp;
> bits32 aSig;
>
> + a = float32_squash_input_denormal(a STATUS_VAR);
> aSig = extractFloat32Frac( a );
> aExp = extractFloat32Exp( a );
> aSign = extractFloat32Sign( a );
> @@ -5952,6 +6051,7 @@ float64 float64_scalbn( float64 a, int n STATUS_PARAM )
> int16 aExp;
> bits64 aSig;
>
> + a = float64_squash_input_denormal(a STATUS_VAR);
> aSig = extractFloat64Frac( a );
> aExp = extractFloat64Exp( a );
> aSign = extractFloat64Sign( a );
> diff --git a/fpu/softfloat.h b/fpu/softfloat.h
> index 1f37877..9a72ee5 100644
> --- a/fpu/softfloat.h
> +++ b/fpu/softfloat.h
> @@ -180,7 +180,8 @@ enum {
> float_flag_divbyzero = 4,
> float_flag_overflow = 8,
> float_flag_underflow = 16,
> - float_flag_inexact = 32
> + float_flag_inexact = 32,
> + float_flag_input_denormal = 64
> };
>
> typedef struct float_status {
> @@ -190,7 +191,10 @@ typedef struct float_status {
> #ifdef FLOATX80
> signed char floatx80_rounding_precision;
> #endif
> + /* should denormalised results go to zero and set the inexact flag? */
> flag flush_to_zero;
> + /* should denormalised inputs go to zero and set the input_denormal
> flag? */
> + flag flush_inputs_to_zero;
> flag default_nan_mode;
> } float_status;
>
> @@ -200,6 +204,10 @@ INLINE void set_flush_to_zero(flag val STATUS_PARAM)
> {
> STATUS(flush_to_zero) = val;
> }
> +INLINE void set_flush_inputs_to_zero(flag val STATUS_PARAM)
> +{
> + STATUS(flush_inputs_to_zero) = val;
> +}
> INLINE void set_default_nan_mode(flag val STATUS_PARAM)
> {
> STATUS(default_nan_mode) = val;
> @@ -294,11 +302,17 @@ float32 float32_scalbn( float32, int STATUS_PARAM );
>
> INLINE float32 float32_abs(float32 a)
> {
> + /* Note that abs does *not* handle NaN specially, nor does
> + * it flush denormal inputs to zero.
> + */
> return make_float32(float32_val(a) & 0x7fffffff);
> }
>
> INLINE float32 float32_chs(float32 a)
> {
> + /* Note that chs does *not* handle NaN specially, nor does
> + * it flush denormal inputs to zero.
> + */
> return make_float32(float32_val(a) ^ 0x80000000);
> }
>
> @@ -374,11 +388,17 @@ float64 float64_scalbn( float64, int STATUS_PARAM );
>
> INLINE float64 float64_abs(float64 a)
> {
> + /* Note that abs does *not* handle NaN specially, nor does
> + * it flush denormal inputs to zero.
> + */
> return make_float64(float64_val(a) & 0x7fffffffffffffffLL);
> }
>
> INLINE float64 float64_chs(float64 a)
> {
> + /* Note that chs does *not* handle NaN specially, nor does
> + * it flush denormal inputs to zero.
> + */
> return make_float64(float64_val(a) ^ 0x8000000000000000LL);
> }
>
> --
> 1.6.3.3
>
>
>
--
Aurelien Jarno GPG: 1024D/F1BCDB73
aurel...@aurel32.net http://www.aurel32.net
