fpu/softfloat: re-factor minmax
Let's do the same re-factor treatment for minmax functions. I still use the MACRO trick to expand but now all the checking code is common. Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Alex Bennée
parent
0bfc9f1952
commit
8936006707
227
fpu/softfloat.c
227
fpu/softfloat.c
@ -1663,6 +1663,126 @@ float64 uint16_to_float64(uint16_t a, float_status *status)
|
||||
return uint64_to_float64(a, status);
|
||||
}
|
||||
|
||||
/* Float Min/Max */
|
||||
/* min() and max() functions. These can't be implemented as
|
||||
* 'compare and pick one input' because that would mishandle
|
||||
* NaNs and +0 vs -0.
|
||||
*
|
||||
* minnum() and maxnum() functions. These are similar to the min()
|
||||
* and max() functions but if one of the arguments is a QNaN and
|
||||
* the other is numerical then the numerical argument is returned.
|
||||
* SNaNs will get quietened before being returned.
|
||||
* minnum() and maxnum correspond to the IEEE 754-2008 minNum()
|
||||
* and maxNum() operations. min() and max() are the typical min/max
|
||||
* semantics provided by many CPUs which predate that specification.
|
||||
*
|
||||
* minnummag() and maxnummag() functions correspond to minNumMag()
|
||||
* and minNumMag() from the IEEE-754 2008.
|
||||
*/
|
||||
static FloatParts minmax_floats(FloatParts a, FloatParts b, bool ismin,
|
||||
bool ieee, bool ismag, float_status *s)
|
||||
{
|
||||
if (unlikely(is_nan(a.cls) || is_nan(b.cls))) {
|
||||
if (ieee) {
|
||||
/* Takes two 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.
|
||||
*/
|
||||
if (is_snan(a.cls) || is_snan(b.cls)) {
|
||||
return pick_nan(a, b, s);
|
||||
} else if (is_nan(a.cls) && !is_nan(b.cls)) {
|
||||
return b;
|
||||
} else if (is_nan(b.cls) && !is_nan(a.cls)) {
|
||||
return a;
|
||||
}
|
||||
}
|
||||
return pick_nan(a, b, s);
|
||||
} else {
|
||||
int a_exp, b_exp;
|
||||
bool a_sign, b_sign;
|
||||
|
||||
switch (a.cls) {
|
||||
case float_class_normal:
|
||||
a_exp = a.exp;
|
||||
break;
|
||||
case float_class_inf:
|
||||
a_exp = INT_MAX;
|
||||
break;
|
||||
case float_class_zero:
|
||||
a_exp = INT_MIN;
|
||||
break;
|
||||
default:
|
||||
g_assert_not_reached();
|
||||
break;
|
||||
}
|
||||
switch (b.cls) {
|
||||
case float_class_normal:
|
||||
b_exp = b.exp;
|
||||
break;
|
||||
case float_class_inf:
|
||||
b_exp = INT_MAX;
|
||||
break;
|
||||
case float_class_zero:
|
||||
b_exp = INT_MIN;
|
||||
break;
|
||||
default:
|
||||
g_assert_not_reached();
|
||||
break;
|
||||
}
|
||||
|
||||
a_sign = a.sign;
|
||||
b_sign = b.sign;
|
||||
if (ismag) {
|
||||
a_sign = b_sign = 0;
|
||||
}
|
||||
|
||||
if (a_sign == b_sign) {
|
||||
bool a_less = a_exp < b_exp;
|
||||
if (a_exp == b_exp) {
|
||||
a_less = a.frac < b.frac;
|
||||
}
|
||||
return a_sign ^ a_less ^ ismin ? b : a;
|
||||
} else {
|
||||
return a_sign ^ ismin ? b : a;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#define MINMAX(sz, name, ismin, isiee, ismag) \
|
||||
float ## sz float ## sz ## _ ## name(float ## sz a, float ## sz b, \
|
||||
float_status *s) \
|
||||
{ \
|
||||
FloatParts pa = float ## sz ## _unpack_canonical(a, s); \
|
||||
FloatParts pb = float ## sz ## _unpack_canonical(b, s); \
|
||||
FloatParts pr = minmax_floats(pa, pb, ismin, isiee, ismag, s); \
|
||||
\
|
||||
return float ## sz ## _round_pack_canonical(pr, s); \
|
||||
}
|
||||
|
||||
MINMAX(16, min, true, false, false)
|
||||
MINMAX(16, minnum, true, true, false)
|
||||
MINMAX(16, minnummag, true, true, true)
|
||||
MINMAX(16, max, false, false, false)
|
||||
MINMAX(16, maxnum, false, true, false)
|
||||
MINMAX(16, maxnummag, false, true, true)
|
||||
|
||||
MINMAX(32, min, true, false, false)
|
||||
MINMAX(32, minnum, true, true, false)
|
||||
MINMAX(32, minnummag, true, true, true)
|
||||
MINMAX(32, max, false, false, false)
|
||||
MINMAX(32, maxnum, false, true, false)
|
||||
MINMAX(32, maxnummag, false, true, true)
|
||||
|
||||
MINMAX(64, min, true, false, false)
|
||||
MINMAX(64, minnum, true, true, false)
|
||||
MINMAX(64, minnummag, true, true, true)
|
||||
MINMAX(64, max, false, false, false)
|
||||
MINMAX(64, maxnum, false, true, false)
|
||||
MINMAX(64, maxnummag, false, true, true)
|
||||
|
||||
#undef MINMAX
|
||||
|
||||
/* Multiply A by 2 raised to the power N. */
|
||||
static FloatParts scalbn_decomposed(FloatParts a, int n, float_status *s)
|
||||
{
|
||||
@ -6912,113 +7032,6 @@ int float128_compare_quiet(float128 a, float128 b, float_status *status)
|
||||
return float128_compare_internal(a, b, 1, status);
|
||||
}
|
||||
|
||||
/* min() and max() functions. These can't be implemented as
|
||||
* 'compare and pick one input' because that would mishandle
|
||||
* NaNs and +0 vs -0.
|
||||
*
|
||||
* minnum() and maxnum() functions. These are similar to the min()
|
||||
* and max() functions but if one of the arguments is a QNaN and
|
||||
* the other is numerical then the numerical argument is returned.
|
||||
* minnum() and maxnum correspond to the IEEE 754-2008 minNum()
|
||||
* and maxNum() operations. min() and max() are the typical min/max
|
||||
* semantics provided by many CPUs which predate that specification.
|
||||
*
|
||||
* minnummag() and maxnummag() functions correspond to minNumMag()
|
||||
* and minNumMag() from the IEEE-754 2008.
|
||||
*/
|
||||
#define MINMAX(s) \
|
||||
static inline float ## s float ## s ## _minmax(float ## s a, float ## s b, \
|
||||
int ismin, int isieee, \
|
||||
int ismag, \
|
||||
float_status *status) \
|
||||
{ \
|
||||
flag aSign, bSign; \
|
||||
uint ## s ## _t av, bv, aav, abv; \
|
||||
a = float ## s ## _squash_input_denormal(a, status); \
|
||||
b = float ## s ## _squash_input_denormal(b, status); \
|
||||
if (float ## s ## _is_any_nan(a) || \
|
||||
float ## s ## _is_any_nan(b)) { \
|
||||
if (isieee) { \
|
||||
if (float ## s ## _is_quiet_nan(a, status) && \
|
||||
!float ## s ##_is_any_nan(b)) { \
|
||||
return b; \
|
||||
} else if (float ## s ## _is_quiet_nan(b, status) && \
|
||||
!float ## s ## _is_any_nan(a)) { \
|
||||
return a; \
|
||||
} \
|
||||
} \
|
||||
return propagateFloat ## s ## NaN(a, b, status); \
|
||||
} \
|
||||
aSign = extractFloat ## s ## Sign(a); \
|
||||
bSign = extractFloat ## s ## Sign(b); \
|
||||
av = float ## s ## _val(a); \
|
||||
bv = float ## s ## _val(b); \
|
||||
if (ismag) { \
|
||||
aav = float ## s ## _abs(av); \
|
||||
abv = float ## s ## _abs(bv); \
|
||||
if (aav != abv) { \
|
||||
if (ismin) { \
|
||||
return (aav < abv) ? a : b; \
|
||||
} else { \
|
||||
return (aav < abv) ? b : a; \
|
||||
} \
|
||||
} \
|
||||
} \
|
||||
if (aSign != bSign) { \
|
||||
if (ismin) { \
|
||||
return aSign ? a : b; \
|
||||
} else { \
|
||||
return aSign ? b : a; \
|
||||
} \
|
||||
} else { \
|
||||
if (ismin) { \
|
||||
return (aSign ^ (av < bv)) ? a : b; \
|
||||
} else { \
|
||||
return (aSign ^ (av < bv)) ? b : a; \
|
||||
} \
|
||||
} \
|
||||
} \
|
||||
\
|
||||
float ## s float ## s ## _min(float ## s a, float ## s b, \
|
||||
float_status *status) \
|
||||
{ \
|
||||
return float ## s ## _minmax(a, b, 1, 0, 0, status); \
|
||||
} \
|
||||
\
|
||||
float ## s float ## s ## _max(float ## s a, float ## s b, \
|
||||
float_status *status) \
|
||||
{ \
|
||||
return float ## s ## _minmax(a, b, 0, 0, 0, status); \
|
||||
} \
|
||||
\
|
||||
float ## s float ## s ## _minnum(float ## s a, float ## s b, \
|
||||
float_status *status) \
|
||||
{ \
|
||||
return float ## s ## _minmax(a, b, 1, 1, 0, status); \
|
||||
} \
|
||||
\
|
||||
float ## s float ## s ## _maxnum(float ## s a, float ## s b, \
|
||||
float_status *status) \
|
||||
{ \
|
||||
return float ## s ## _minmax(a, b, 0, 1, 0, status); \
|
||||
} \
|
||||
\
|
||||
float ## s float ## s ## _minnummag(float ## s a, float ## s b, \
|
||||
float_status *status) \
|
||||
{ \
|
||||
return float ## s ## _minmax(a, b, 1, 1, 1, status); \
|
||||
} \
|
||||
\
|
||||
float ## s float ## s ## _maxnummag(float ## s a, float ## s b, \
|
||||
float_status *status) \
|
||||
{ \
|
||||
return float ## s ## _minmax(a, b, 0, 1, 1, status); \
|
||||
}
|
||||
|
||||
MINMAX(32)
|
||||
MINMAX(64)
|
||||
|
||||
|
||||
floatx80 floatx80_scalbn(floatx80 a, int n, float_status *status)
|
||||
{
|
||||
flag aSign;
|
||||
|
||||
@ -245,6 +245,12 @@ float16 float16_mul(float16, float16, float_status *status);
|
||||
float16 float16_muladd(float16, float16, float16, int, float_status *status);
|
||||
float16 float16_div(float16, float16, float_status *status);
|
||||
float16 float16_scalbn(float16, int, float_status *status);
|
||||
float16 float16_min(float16, float16, float_status *status);
|
||||
float16 float16_max(float16, float16, float_status *status);
|
||||
float16 float16_minnum(float16, float16, float_status *status);
|
||||
float16 float16_maxnum(float16, float16, float_status *status);
|
||||
float16 float16_minnummag(float16, float16, float_status *status);
|
||||
float16 float16_maxnummag(float16, float16, float_status *status);
|
||||
|
||||
int float16_is_quiet_nan(float16, float_status *status);
|
||||
int float16_is_signaling_nan(float16, float_status *status);
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user