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softfpu: Add float_round_to_odd_inf

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For Arm BFDOT and BFMMLA, we need a version of round-to-odd
that overflows to infinity, instead of the max normal number.

Cc: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20210525225817.400336-6-richard.henderson@linaro.org
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2021-05-25 15:58:10 -07:00 • committed by Peter Maydell
parent d29b17ca3e
commit 60c8f7265d
2 changed files with 7 additions and 3 deletions
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4
include/fpu/softfloat-types.h
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@ -134,8 +134,10 @@ typedef enum __attribute__((__packed__)) {
float_round_up = 2,
float_round_to_zero = 3,
float_round_ties_away = 4,
/* Not an IEEE rounding mode: round to the closest odd mantissa value */
/* Not an IEEE rounding mode: round to closest odd, overflow to max */
float_round_to_odd = 5,
/* Not an IEEE rounding mode: round to closest odd, overflow to inf */
float_round_to_odd_inf = 6,
} FloatRoundMode;
/*