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softfp: Added hardfloat conversion from float32 to float64 

Reintroduce float32_to_float64 that was removed here:
https://lists.gnu.org/archive/html/qemu-devel/2018-04/msg00455.html

 - nbench test it not actually calling this function at all
 - SPECS 2006 significat number of tests impoved their runtime, just
   few of them showed small slowdown

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Matus Kysel <mkysel@tachyum.com>
Message-Id: <20191017142133.59439-1-mkysel@tachyum.com>
[rth: Add comment about impossible inexact exceptions.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Matus Kysel 2019-10-17 16:21:33 +02:00 committed by Richard Henderson
parent 16884391c7
commit 21381dcf0c
1 changed files with 18 additions and 1 deletions
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19
fpu/softfloat.c
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@ -1920,13 +1920,30 @@ float16 float32_to_float16(float32 a, bool ieee, float_status *s)
return float16a_round_pack_canonical(pr, s, fmt16);
}
float64 float32_to_float64(float32 a, float_status *s)
static float64 QEMU_SOFTFLOAT_ATTR
soft_float32_to_float64(float32 a, float_status *s)
{
FloatParts p = float32_unpack_canonical(a, s);
FloatParts pr = float_to_float(p, &float64_params, s);
return float64_round_pack_canonical(pr, s);
}
float64 float32_to_float64(float32 a, float_status *s)
{
if (likely(float32_is_normal(a))) {
/* Widening conversion can never produce inexact results. */
union_float32 uf;
union_float64 ud;
uf.s = a;
ud.h = uf.h;
return ud.s;
} else if (float32_is_zero(a)) {
return float64_set_sign(float64_zero, float32_is_neg(a));
} else {
return soft_float32_to_float64(a, s);
}
}
float16 float64_to_float16(float64 a, bool ieee, float_status *s)
{
const FloatFmt *fmt16 = ieee ? &float16_params : &float16_params_ahp;