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fpu/softfloat: re-factor compare 

The compare function was already expanded from a macro. I keep the
macro expansion but move most of the logic into a compare_decomposed.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Alex Bennée 2017-12-05 17:14:42 +00:00
parent 8936006707
commit 0c4c909291
2 changed files with 82 additions and 54 deletions
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134
fpu/softfloat.c
View File

@ -1783,6 +1783,86 @@ MINMAX(64, maxnummag, false, true, true)
#undef MINMAX
/* Floating point compare */
static int compare_floats(FloatParts a, FloatParts b, bool is_quiet,
float_status *s)
{
if (is_nan(a.cls) || is_nan(b.cls)) {
if (!is_quiet ||
a.cls == float_class_snan ||
b.cls == float_class_snan) {
s->float_exception_flags |= float_flag_invalid;
}
return float_relation_unordered;
}
if (a.cls == float_class_zero) {
if (b.cls == float_class_zero) {
return float_relation_equal;
}
return b.sign ? float_relation_greater : float_relation_less;
} else if (b.cls == float_class_zero) {
return a.sign ? float_relation_less : float_relation_greater;
}
/* The only really important thing about infinity is its sign. If
* both are infinities the sign marks the smallest of the two.
*/
if (a.cls == float_class_inf) {
if ((b.cls == float_class_inf) && (a.sign == b.sign)) {
return float_relation_equal;
}
return a.sign ? float_relation_less : float_relation_greater;
} else if (b.cls == float_class_inf) {
return b.sign ? float_relation_greater : float_relation_less;
}
if (a.sign != b.sign) {
return a.sign ? float_relation_less : float_relation_greater;
}
if (a.exp == b.exp) {
if (a.frac == b.frac) {
return float_relation_equal;
}
if (a.sign) {
return a.frac > b.frac ?
float_relation_less : float_relation_greater;
} else {
return a.frac > b.frac ?
float_relation_greater : float_relation_less;
}
} else {
if (a.sign) {
return a.exp > b.exp ? float_relation_less : float_relation_greater;
} else {
return a.exp > b.exp ? float_relation_greater : float_relation_less;
}
}
}
#define COMPARE(sz) \
int float ## sz ## _compare(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); \
return compare_floats(pa, pb, false, s); \
} \
int float ## sz ## _compare_quiet(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); \
return compare_floats(pa, pb, true, s); \
}
COMPARE(16)
COMPARE(32)
COMPARE(64)
#undef COMPARE
/* Multiply A by 2 raised to the power N. */
static FloatParts scalbn_decomposed(FloatParts a, int n, float_status *s)
{
@ -6884,60 +6964,6 @@ int float128_unordered_quiet(float128 a, float128 b, float_status *status)
return 0;
}
#define COMPARE(s, nan_exp) \
static inline int float ## s ## _compare_internal(float ## s a, float ## s b,\
int is_quiet, float_status *status) \
{ \
flag aSign, bSign; \
uint ## s ## _t av, bv; \
a = float ## s ## _squash_input_denormal(a, status); \
b = float ## s ## _squash_input_denormal(b, status); \
\
if (( ( extractFloat ## s ## Exp( a ) == nan_exp ) && \
extractFloat ## s ## Frac( a ) ) || \
( ( extractFloat ## s ## Exp( b ) == nan_exp ) && \
extractFloat ## s ## Frac( b ) )) { \
if (!is_quiet || \
float ## s ## _is_signaling_nan(a, status) || \
float ## s ## _is_signaling_nan(b, status)) { \
float_raise(float_flag_invalid, status); \
} \
return float_relation_unordered; \
} \
aSign = extractFloat ## s ## Sign( a ); \
bSign = extractFloat ## s ## Sign( b ); \
av = float ## s ## _val(a); \
bv = float ## s ## _val(b); \
if ( aSign != bSign ) { \
if ( (uint ## s ## _t) ( ( av | bv )<<1 ) == 0 ) { \
/* zero case */ \
return float_relation_equal; \
} else { \
return 1 - (2 * aSign); \
} \
} else { \
if (av == bv) { \
return float_relation_equal; \
} else { \
return 1 - 2 * (aSign ^ ( av < bv )); \
} \
} \
} \
\
int float ## s ## _compare(float ## s a, float ## s b, float_status *status) \
{ \
return float ## s ## _compare_internal(a, b, 0, status); \
} \
\
int float ## s ## _compare_quiet(float ## s a, float ## s b, \
float_status *status) \
{ \
return float ## s ## _compare_internal(a, b, 1, status); \
}
COMPARE(32, 0xff)
COMPARE(64, 0x7ff)
static inline int floatx80_compare_internal(floatx80 a, floatx80 b,
int is_quiet, float_status *status)
{

2
include/fpu/softfloat.h
View File

@ -251,6 +251,8 @@ 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_compare(float16, float16, float_status *status);
int float16_compare_quiet(float16, float16, float_status *status);
int float16_is_quiet_nan(float16, float_status *status);
int float16_is_signaling_nan(float16, float_status *status);