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softfloat: Define operations for bfloat16

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This patch implements operations for bfloat16 except conversion and some misc
operations. We also add FloatFmt and pack/unpack interfaces for bfloat16.
As they are both static fields, we can't make a sperate patch for them.

Signed-off-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200813071421.2509-2-zhiwei_liu@c-sky.com>
[rth: Use FloatRelation for comparison operations.]
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
LIU Zhiwei 2020-08-13 15:14:19 +08:00 • committed by Richard Henderson
parent a03e924cf8
commit 8282310d85
3 changed files with 211 additions and 0 deletions
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38
include/fpu/softfloat.h
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@ -109,6 +109,7 @@ void float_raise(uint8_t flags, float_status *status);
float16 float16_squash_input_denormal(float16 a, float_status *status);
float32 float32_squash_input_denormal(float32 a, float_status *status);
float64 float64_squash_input_denormal(float64 a, float_status *status);
bfloat16 bfloat16_squash_input_denormal(bfloat16 a, float_status *status);
/*----------------------------------------------------------------------------
| Options to indicate which negations to perform in float*_muladd()
@ -347,6 +348,43 @@ static inline bool float16_unordered_quiet(float16 a, float16 b,
#define float16_three make_float16(0x4200)
#define float16_infinity make_float16(0x7c00)
/*----------------------------------------------------------------------------
| Software bfloat16 operations.
*----------------------------------------------------------------------------*/
bfloat16 bfloat16_add(bfloat16, bfloat16, float_status *status);
bfloat16 bfloat16_sub(bfloat16, bfloat16, float_status *status);
bfloat16 bfloat16_mul(bfloat16, bfloat16, float_status *status);
bfloat16 bfloat16_div(bfloat16, bfloat16, float_status *status);
bfloat16 bfloat16_muladd(bfloat16, bfloat16, bfloat16, int,
float_status *status);
float16 bfloat16_scalbn(bfloat16, int, float_status *status);
bfloat16 bfloat16_min(bfloat16, bfloat16, float_status *status);
bfloat16 bfloat16_max(bfloat16, bfloat16, float_status *status);
bfloat16 bfloat16_minnum(bfloat16, bfloat16, float_status *status);
bfloat16 bfloat16_maxnum(bfloat16, bfloat16, float_status *status);
bfloat16 bfloat16_minnummag(bfloat16, bfloat16, float_status *status);
bfloat16 bfloat16_maxnummag(bfloat16, bfloat16, float_status *status);
bfloat16 bfloat16_sqrt(bfloat16, float_status *status);
FloatRelation bfloat16_compare(bfloat16, bfloat16, float_status *status);
FloatRelation bfloat16_compare_quiet(bfloat16, bfloat16, float_status *status);
bfloat16 bfloat16_silence_nan(bfloat16, float_status *status);
bfloat16 bfloat16_default_nan(float_status *status);
static inline bfloat16 bfloat16_set_sign(bfloat16 a, int sign)
{
return (a & 0x7fff) | (sign << 15);
}
#define bfloat16_zero 0
#define bfloat16_half 0x3f00
#define bfloat16_one 0x3f80
#define bfloat16_one_point_five 0x3fc0
#define bfloat16_two 0x4000
#define bfloat16_three 0x4040
#define bfloat16_infinity 0x7f80
/*----------------------------------------------------------------------------
| The pattern for a default generated half-precision NaN.
*----------------------------------------------------------------------------*/