softfloat: Fix float64_to_uint64_round_to_zero
The float64_to_uint64_round_to_zero routine is incorrect. For example, the following test pattern: 46697351FF4AEC29 / 0x1.97351ff4aec29p+103 currently produces 8000000000000000 instead of FFFFFFFFFFFFFFFF. This patch re-implements the routine to temporarily force the rounding mode and use the float64_to_uint64 routine. This contribution can be licensed under either the softfloat-2a or -2b license. Signed-off-by: Tom Musta <tommusta@gmail.com> Message-id: 1387397961-4894-4-git-send-email-tommusta@gmail.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <rth@twiddle.net>
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@ -6792,13 +6792,11 @@ uint64_t float64_to_uint64(float64 a STATUS_PARAM)
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uint64_t float64_to_uint64_round_to_zero (float64 a STATUS_PARAM)
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{
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int64_t v;
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v = float64_val(int64_to_float64(INT64_MIN STATUS_VAR));
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v += float64_val(a);
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v = float64_to_int64_round_to_zero(make_float64(v) STATUS_VAR);
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return v - INT64_MIN;
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signed char current_rounding_mode = STATUS(float_rounding_mode);
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set_float_rounding_mode(float_round_to_zero STATUS_VAR);
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int64_t v = float64_to_uint64(a STATUS_VAR);
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set_float_rounding_mode(current_rounding_mode STATUS_VAR);
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return v;
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}
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#define COMPARE(s, nan_exp) \
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