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[PULL for-4.2 1/1] softfp: Added hardfloat conversion from float32 to fl
From: |
Richard Henderson |
Subject: |
[PULL for-4.2 1/1] softfp: Added hardfloat conversion from float32 to float64 |
Date: |
Wed, 30 Oct 2019 19:09:53 +0100 |
From: Matus Kysel <address@hidden>
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 <address@hidden>
Signed-off-by: Matus Kysel <address@hidden>
Message-Id: <address@hidden>
[rth: Add comment about impossible inexact exceptions.]
Signed-off-by: Richard Henderson <address@hidden>
---
fpu/softfloat.c | 19 ++++++++++++++++++-
1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 0638c9f4e0..301ce3b537 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 *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;
--
2.17.1