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fpu: Add rebias bool, value and operation

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Added the possibility of recalculating a result if it overflows or
underflows, if the result overflow and the rebias bool is true then the
intermediate result should have 3/4 of the total range subtracted from
the exponent. The same for underflow but it should be added to the
exponent of the intermediate number instead.

Signed-off-by: Lucas Mateus Castro (alqotel) <lucas.araujo@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220805141522.412864-2-lucas.araujo@eldorado.org.br>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
This commit is contained in:
Lucas Mateus Castro (alqotel) 2022-08-05 11:15:21 -03:00 • committed by Daniel Henrique Barboza
parent 0bf4d77e59
commit c40da5c6fb
3 changed files with 25 additions and 2 deletions
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4
include/fpu/softfloat-types.h
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@ -195,6 +195,10 @@ typedef struct float_status {
bool snan_bit_is_one;
bool use_first_nan;
bool no_signaling_nans;
/* should overflowed results subtract re_bias to its exponent? */
bool rebias_overflow;
/* should underflowed results add re_bias to its exponent? */
bool rebias_underflow;
} float_status;
#endif /* SOFTFLOAT_TYPES_H */