mirror of https://github.com/proxmox/mirror_qemu
softfpu: Add float_round_to_odd_inf
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>master
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d29b17ca3e
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60c8f7265d
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@ -176,13 +176,12 @@ static void partsN(uncanon)(FloatPartsN *p, float_status *s,
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g_assert_not_reached();
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g_assert_not_reached();
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}
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}
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overflow_norm = false;
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switch (s->float_rounding_mode) {
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switch (s->float_rounding_mode) {
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case float_round_nearest_even:
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case float_round_nearest_even:
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overflow_norm = false;
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inc = ((p->frac_lo & roundeven_mask) != frac_lsbm1 ? frac_lsbm1 : 0);
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inc = ((p->frac_lo & roundeven_mask) != frac_lsbm1 ? frac_lsbm1 : 0);
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break;
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break;
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case float_round_ties_away:
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case float_round_ties_away:
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overflow_norm = false;
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inc = frac_lsbm1;
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inc = frac_lsbm1;
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break;
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break;
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case float_round_to_zero:
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case float_round_to_zero:
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@ -199,6 +198,8 @@ static void partsN(uncanon)(FloatPartsN *p, float_status *s,
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break;
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break;
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case float_round_to_odd:
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case float_round_to_odd:
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overflow_norm = true;
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overflow_norm = true;
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/* fall through */
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case float_round_to_odd_inf:
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inc = p->frac_lo & frac_lsb ? 0 : round_mask;
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inc = p->frac_lo & frac_lsb ? 0 : round_mask;
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break;
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break;
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default:
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default:
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@ -259,6 +260,7 @@ static void partsN(uncanon)(FloatPartsN *p, float_status *s,
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? frac_lsbm1 : 0);
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? frac_lsbm1 : 0);
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break;
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break;
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case float_round_to_odd:
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case float_round_to_odd:
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case float_round_to_odd_inf:
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inc = p->frac_lo & frac_lsb ? 0 : round_mask;
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inc = p->frac_lo & frac_lsb ? 0 : round_mask;
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break;
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break;
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default:
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default:
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@ -134,8 +134,10 @@ typedef enum __attribute__((__packed__)) {
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float_round_up = 2,
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float_round_up = 2,
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float_round_to_zero = 3,
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float_round_to_zero = 3,
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float_round_ties_away = 4,
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float_round_ties_away = 4,
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/* Not an IEEE rounding mode: round to the closest odd mantissa value */
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/* Not an IEEE rounding mode: round to closest odd, overflow to max */
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float_round_to_odd = 5,
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float_round_to_odd = 5,
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/* Not an IEEE rounding mode: round to closest odd, overflow to inf */
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float_round_to_odd_inf = 6,
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} FloatRoundMode;
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} FloatRoundMode;
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/*
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/*
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