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softfloat: Fix float64_to_uint32_round_to_zero

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The float64_to_uint32_round_to_zero routine is incorrect.

For example, the following test pattern:

    425F81378DC0CD1F / 0x1.f81378dc0cd1fp+38

will erroneously set the inexact flag.

This patch re-implements the routine to use the float64_to_uint64_round_to_zero
routine.  If saturation occurs we ignore any flags set by the
conversion function and raise only Invalid.

This contribution can be licensed under either the softfloat-2a or -2b
license.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Message-id: 1387397961-4894-6-git-send-email-tommusta@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Tom Musta 2014-01-07 17:17:51 +00:00 committed by Peter Maydell
parent 5e7f654fa1
commit fd728f2f94
1 changed files with 7 additions and 8 deletions
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15
fpu/softfloat.c
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@ -6667,19 +6667,18 @@ uint32 float64_to_uint32( float64 a STATUS_PARAM )
uint32 float64_to_uint32_round_to_zero( float64 a STATUS_PARAM ) uint32 float64_to_uint32_round_to_zero( float64 a STATUS_PARAM )
{ {
int64_t v; uint64_t v;
uint32 res; uint32 res;
int old_exc_flags = get_float_exception_flags(status);
v = float64_to_int64_round_to_zero(a STATUS_VAR); v = float64_to_uint64_round_to_zero(a STATUS_VAR);
if (v < 0) { if (v > 0xffffffff) {
res = 0;
float_raise( float_flag_invalid STATUS_VAR);
} else if (v > 0xffffffff) {
res = 0xffffffff; res = 0xffffffff;
float_raise( float_flag_invalid STATUS_VAR);
} else { } else {
res = v; return v;
} }
set_float_exception_flags(old_exc_flags, status);
float_raise(float_flag_invalid STATUS_VAR);
return res; return res;
} }