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softfloat: Split out parts_uncanon_normal 

We will need to treat the non-normal cases of floatx80 specially,
so split out the normal case that we can reuse.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-11-20 12:11:08 -08:00
parent 9261b245f0
commit 25fdedf0d3
2 changed files with 40 additions and 27 deletions
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59
fpu/softfloat-parts.c.inc
View File

@ -140,8 +140,8 @@ static void partsN(canonicalize)(FloatPartsN *p, float_status *status,
* fraction; these bits will be removed. The exponent will be biased
* by EXP_BIAS and must be bounded by [EXP_MAX-1, 0].
*/
static void partsN(uncanon)(FloatPartsN *p, float_status *s,
const FloatFmt *fmt)
static void partsN(uncanon_normal)(FloatPartsN *p, float_status *s,
const FloatFmt *fmt)
{
const int exp_max = fmt->exp_max;
const int frac_shift = fmt->frac_shift;
@ -150,33 +150,9 @@ static void partsN(uncanon)(FloatPartsN *p, float_status *s,
const uint64_t round_mask = fmt->round_mask;
const uint64_t roundeven_mask = fmt->roundeven_mask;
uint64_t inc;
bool overflow_norm;
bool overflow_norm = false;
int exp, flags = 0;
if (unlikely(p->cls != float_class_normal)) {
switch (p->cls) {
case float_class_zero:
p->exp = 0;
frac_clear(p);
return;
case float_class_inf:
g_assert(!fmt->arm_althp);
p->exp = fmt->exp_max;
frac_clear(p);
return;
case float_class_qnan:
case float_class_snan:
g_assert(!fmt->arm_althp);
p->exp = fmt->exp_max;
frac_shr(p, fmt->frac_shift);
return;
default:
break;
}
g_assert_not_reached();
}
overflow_norm = false;
switch (s->float_rounding_mode) {
case float_round_nearest_even:
inc = ((p->frac_lo & roundeven_mask) != frac_lsbm1 ? frac_lsbm1 : 0);
@ -284,6 +260,35 @@ static void partsN(uncanon)(FloatPartsN *p, float_status *s,
float_raise(flags, s);
}
static void partsN(uncanon)(FloatPartsN *p, float_status *s,
const FloatFmt *fmt)
{
if (likely(p->cls == float_class_normal)) {
parts_uncanon_normal(p, s, fmt);
} else {
switch (p->cls) {
case float_class_zero:
p->exp = 0;
frac_clear(p);
return;
case float_class_inf:
g_assert(!fmt->arm_althp);
p->exp = fmt->exp_max;
frac_clear(p);
return;
case float_class_qnan:
case float_class_snan:
g_assert(!fmt->arm_althp);
p->exp = fmt->exp_max;
frac_shr(p, fmt->frac_shift);
return;
default:
break;
}
g_assert_not_reached();
}
}
/*
* Returns the result of adding or subtracting the values of the
* floating-point values `a' and `b'. The operation is performed

8
fpu/softfloat.c
View File

@ -764,6 +764,14 @@ static void parts128_canonicalize(FloatParts128 *p, float_status *status,
#define parts_canonicalize(A, S, F) \
PARTS_GENERIC_64_128(canonicalize, A)(A, S, F)
static void parts64_uncanon_normal(FloatParts64 *p, float_status *status,
const FloatFmt *fmt);
static void parts128_uncanon_normal(FloatParts128 *p, float_status *status,
const FloatFmt *fmt);
#define parts_uncanon_normal(A, S, F) \
PARTS_GENERIC_64_128(uncanon_normal, A)(A, S, F)
static void parts64_uncanon(FloatParts64 *p, float_status *status,
const FloatFmt *fmt);
static void parts128_uncanon(FloatParts128 *p, float_status *status,