* [PATCH v2] Added hardfloat conversion from float32 to float64
@ 2019-10-17 14:21 Matus Kysel
2019-10-30 9:06 ` Richard Henderson
0 siblings, 1 reply; 2+ messages in thread
From: Matus Kysel @ 2019-10-17 14:21 UTC (permalink / raw)
To: qemu-devel; +Cc: Peter Maydell, Alex Bennée, Aurelien Jarno, Matus Kysel
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
Signed-off-by: Matus Kysel <mkysel@tachyum.com>
---
fpu/softfloat.c | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 0638c9f4e0..4bc7c38668 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -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 * status)
+{
+ if (likely(float32_is_normal(a))) {
+ 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, status);
+ }
+}
+
float16 float64_to_float16(float64 a, bool ieee, float_status *s)
{
const FloatFmt *fmt16 = ieee ? &float16_params : &float16_params_ahp;
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2] Added hardfloat conversion from float32 to float64
2019-10-17 14:21 [PATCH v2] Added hardfloat conversion from float32 to float64 Matus Kysel
@ 2019-10-30 9:06 ` Richard Henderson
0 siblings, 0 replies; 2+ messages in thread
From: Richard Henderson @ 2019-10-30 9:06 UTC (permalink / raw)
To: Matus Kysel, qemu-devel; +Cc: Peter Maydell, Alex Bennée, Aurelien Jarno
On 10/17/19 4:21 PM, Matus Kysel wrote:
> 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
>
> Signed-off-by: Matus Kysel <mkysel@tachyum.com>
> ---
> fpu/softfloat.c | 19 ++++++++++++++++++-
> 1 file changed, 18 insertions(+), 1 deletion(-)
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Queued.
r~
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