[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[RFC PATCH 5/8] softfloat: add float128_to_uint128
From: |
matheus . ferst |
Subject: |
[RFC PATCH 5/8] softfloat: add float128_to_uint128 |
Date: |
Wed, 30 Mar 2022 14:59:29 -0300 |
From: Matheus Ferst <matheus.ferst@eldorado.org.br>
Implements float128_to_uint128 based on parts_float_to_uint logic.
Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
---
fpu/softfloat.c | 65 +++++++++++++++++++++++++++++++++++++++++
include/fpu/softfloat.h | 2 ++
2 files changed, 67 insertions(+)
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 60b4702945..ce21b64e4f 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -3480,6 +3480,61 @@ static uint64_t float128_to_uint64_scalbn(float128 a,
FloatRoundMode rmode,
return parts_float_to_uint(&p, rmode, scale, UINT64_MAX, s);
}
+static Int128 float128_to_uint128_scalbn(float128 a, FloatRoundMode rmode,
+ int scale, float_status *s)
+{
+ int flags = 0;
+ Int128 r;
+ FloatParts128 p;
+
+ float128_unpack_canonical(&p, a, s);
+
+ switch (p.cls) {
+ case float_class_snan:
+ flags |= float_flag_invalid_snan;
+ /* fall through */
+ case float_class_qnan:
+ flags |= float_flag_invalid;
+ r = UINT128_MAX;
+ break;
+
+ case float_class_inf:
+ flags = float_flag_invalid | float_flag_invalid_cvti;
+ r = p.sign ? int128_zero() : UINT128_MAX;
+ break;
+
+ case float_class_zero:
+ return int128_zero();
+
+ case float_class_normal:
+ if (parts_round_to_int_normal(&p, rmode, scale, 128 - 2)) {
+ flags = float_flag_inexact;
+ if (p.cls == float_class_zero) {
+ r = int128_zero();
+ break;
+ }
+ }
+
+ if (p.sign) {
+ flags = float_flag_invalid | float_flag_invalid_cvti;
+ r = int128_zero();
+ } else if (p.exp <= 127) {
+ int shift = 127 - p.exp;
+ r = int128_urshift(int128_make128(p.frac_lo, p.frac_hi), shift);
+ } else {
+ flags = float_flag_invalid | float_flag_invalid_cvti;
+ r = UINT128_MAX;
+ }
+ break;
+
+ default:
+ g_assert_not_reached();
+ }
+
+ float_raise(flags, s);
+ return r;
+}
+
uint8_t float16_to_uint8(float16 a, float_status *s)
{
return float16_to_uint8_scalbn(a, s->float_rounding_mode, 0, s);
@@ -3540,6 +3595,11 @@ uint64_t float128_to_uint64(float128 a, float_status *s)
return float128_to_uint64_scalbn(a, s->float_rounding_mode, 0, s);
}
+Int128 float128_to_uint128(float128 a, float_status *s)
+{
+ return float128_to_uint128_scalbn(a, s->float_rounding_mode, 0, s);
+}
+
uint16_t float16_to_uint16_round_to_zero(float16 a, float_status *s)
{
return float16_to_uint16_scalbn(a, float_round_to_zero, 0, s);
@@ -3595,6 +3655,11 @@ uint64_t float128_to_uint64_round_to_zero(float128 a,
float_status *s)
return float128_to_uint64_scalbn(a, float_round_to_zero, 0, s);
}
+Int128 float128_to_uint128_round_to_zero(float128 a, float_status *s)
+{
+ return float128_to_uint128_scalbn(a, float_round_to_zero, 0, s);
+}
+
uint16_t bfloat16_to_uint16(bfloat16 a, float_status *s)
{
return bfloat16_to_uint16_scalbn(a, s->float_rounding_mode, 0, s);
diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h
index 3994b7235d..6cfe9ee474 100644
--- a/include/fpu/softfloat.h
+++ b/include/fpu/softfloat.h
@@ -1206,7 +1206,9 @@ int32_t float128_to_int32_round_to_zero(float128,
float_status *status);
int64_t float128_to_int64(float128, float_status *status);
int64_t float128_to_int64_round_to_zero(float128, float_status *status);
uint64_t float128_to_uint64(float128, float_status *status);
+Int128 float128_to_uint128(float128, float_status *status);
uint64_t float128_to_uint64_round_to_zero(float128, float_status *status);
+Int128 float128_to_uint128_round_to_zero(float128, float_status *status);
uint32_t float128_to_uint32(float128, float_status *status);
uint32_t float128_to_uint32_round_to_zero(float128, float_status *status);
float32 float128_to_float32(float128, float_status *status);
--
2.25.1
- [RFC PATCH 0/8] Alternative softfloat 128-bit integer support, matheus . ferst, 2022/03/30
- [RFC PATCH 1/8] qemu/int128: avoid undefined behavior in int128_lshift, matheus . ferst, 2022/03/30
- [RFC PATCH 2/8] qemu/int128: add int128_urshift, matheus . ferst, 2022/03/30
- [RFC PATCH 3/8] softfloat: add uint128_to_float128, matheus . ferst, 2022/03/30
- [RFC PATCH 4/8] softfloat: add int128_to_float128, matheus . ferst, 2022/03/30
- [RFC PATCH 5/8] softfloat: add float128_to_uint128,
matheus . ferst <=
- [RFC PATCH 6/8] softfloat: add float128_to_int128, matheus . ferst, 2022/03/30
- [RFC PATCH 7/8] target/ppc: implement xscv[su]qqp, matheus . ferst, 2022/03/30
- [RFC PATCH 8/8] target/ppc: implement xscvqp[su]qz, matheus . ferst, 2022/03/30