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fpu: Add float64_to_int{32,64}_modulo

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Add versions of float64_to_int* which do not saturate the result.

Reviewed-by: Christoph Muellner <christoph.muellner@vrull.eu>
Tested-by: Christoph Muellner <christoph.muellner@vrull.eu>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230527141910.1885950-2-richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-05-27 07:19:07 -07:00
parent e665cf72fe
commit e2041f4d5d
3 changed files with 112 additions and 0 deletions
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31
fpu/softfloat.c
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@ -852,11 +852,24 @@ static uint64_t parts128_float_to_uint(FloatParts128 *p, FloatRoundMode rmode,
#define parts_float_to_uint(P, R, Z, M, S) \
PARTS_GENERIC_64_128(float_to_uint, P)(P, R, Z, M, S)
static int64_t parts64_float_to_sint_modulo(FloatParts64 *p,
FloatRoundMode rmode,
int bitsm1, float_status *s);
static int64_t parts128_float_to_sint_modulo(FloatParts128 *p,
FloatRoundMode rmode,
int bitsm1, float_status *s);
#define parts_float_to_sint_modulo(P, R, M, S) \
PARTS_GENERIC_64_128(float_to_sint_modulo, P)(P, R, M, S)
static void parts64_sint_to_float(FloatParts64 *p, int64_t a,
int scale, float_status *s);
static void parts128_sint_to_float(FloatParts128 *p, int64_t a,
int scale, float_status *s);
#define parts_float_to_sint(P, R, Z, MN, MX, S) \
PARTS_GENERIC_64_128(float_to_sint, P)(P, R, Z, MN, MX, S)
#define parts_sint_to_float(P, I, Z, S) \
PARTS_GENERIC_64_128(sint_to_float, P)(P, I, Z, S)
@ -3409,6 +3422,24 @@ int64_t bfloat16_to_int64_round_to_zero(bfloat16 a, float_status *s)
return bfloat16_to_int64_scalbn(a, float_round_to_zero, 0, s);
}
int32_t float64_to_int32_modulo(float64 a, FloatRoundMode rmode,
float_status *s)
{
FloatParts64 p;
float64_unpack_canonical(&p, a, s);
return parts_float_to_sint_modulo(&p, rmode, 31, s);
}
int64_t float64_to_int64_modulo(float64 a, FloatRoundMode rmode,
float_status *s)
{
FloatParts64 p;
float64_unpack_canonical(&p, a, s);
return parts_float_to_sint_modulo(&p, rmode, 63, s);
}
/*
* Floating-point to unsigned integer conversions
*/