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Corrected unspecified behavior of corner cases in fp.min/fp.max.

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Partially addresses #68.
This commit is contained in:
Christoph M. Wintersteiger 2015-10-06 19:45:05 +01:00
parent 6e852762ba
commit 8a026c355f
10 changed files with 211 additions and 55 deletions
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18
src/util/mpf.cpp
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@ -1248,12 +1248,13 @@ void mpf_manager::rem(mpf const & x, mpf const & y, mpf & o) {
void mpf_manager::maximum(mpf const & x, mpf const & y, mpf & o) {
if (is_nan(x))
set(o, y);
else if (is_zero(x) && is_zero(y) && sgn(x) != sgn(y))
mk_pzero(x.ebits, x.sbits, o);
else if (is_zero(x) && is_zero(y))
set(o, y);
else if (is_nan(y))
set(o, x);
else if (is_zero(x) && is_zero(y) && sgn(x) != sgn(y)) {
UNREACHABLE(); // max(+0, -0) and max(-0, +0) are unspecified.
}
else if (is_zero(x) && is_zero(y))
set(o, y);
else if (gt(x, y))
set(o, x);
else
@ -1263,12 +1264,13 @@ void mpf_manager::maximum(mpf const & x, mpf const & y, mpf & o) {
void mpf_manager::minimum(mpf const & x, mpf const & y, mpf & o) {
if (is_nan(x))
set(o, y);
else if (is_zero(x) && is_zero(y) && sgn(x) != sgn(y))
mk_pzero(x.ebits, x.sbits, o);
else if (is_zero(x) && is_zero(y))
set(o, y);
else if (is_nan(y))
set(o, x);
else if (is_zero(x) && is_zero(y) && sgn(x) != sgn(y)) {
UNREACHABLE(); // min(+0, -0) and min(-0, +0) are unspecified.
}
else if (is_zero(x) && is_zero(y))
set(o, y);
else if (lt(x, y))
set(o, x);
else