softfloat: Fix float64_to_uint32
The float64_to_uint32 has several flaws: - for numbers between 2**32 and 2**64, the inexact exception flag may get incorrectly set. In this case, only the invalid flag should be set. test pattern: 425F81378DC0CD1F / 0x1.f81378dc0cd1fp+38 - for numbers between 2**63 and 2**64, incorrect results may be produced: test pattern: 43EAAF73F1F0B8BD / 0x1.aaf73f1f0b8bdp+63 This patch re-implements float64_to_uint32 to re-use the float64_to_uint64 routine (instead of float64_to_int64). For the saturation case, we ignore any flags which the conversion routine has set and raise only the invalid flag. This contribution can be licensed under either the softfloat-2a or -2b license. Signed-off-by: Tom Musta <tommusta@gmail.com> Message-id: 1387397961-4894-5-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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@ -6650,19 +6650,18 @@ uint_fast16_t float32_to_uint16_round_to_zero(float32 a STATUS_PARAM)
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uint32 float64_to_uint32( float64 a STATUS_PARAM )
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{
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int64_t v;
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uint64_t v;
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uint32 res;
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int old_exc_flags = get_float_exception_flags(status);
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v = float64_to_int64(a STATUS_VAR);
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if (v < 0) {
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res = 0;
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float_raise( float_flag_invalid STATUS_VAR);
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} else if (v > 0xffffffff) {
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v = float64_to_uint64(a STATUS_VAR);
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if (v > 0xffffffff) {
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res = 0xffffffff;
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float_raise( float_flag_invalid STATUS_VAR);
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} else {
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res = v;
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return v;
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}
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set_float_exception_flags(old_exc_flags, status);
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float_raise(float_flag_invalid STATUS_VAR);
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return res;
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}
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