search for: rmtowardneg

...gt; > /* If two numbers add (exactly) to zero, IEEE 754 decrees it is a > positive zero unless rounding to minus infinity, except that > > adding two like-signed zeroes gives that zero. */ > if (category == fcZero && sign != addend.sign) > sign = (rounding_mode == rmTowardNegative); > > The test "category == fcZero" tells us that the result was zero after > rounding back down to standard precision, but since the addition is carried > out in extended precision this doesn't guarantee that the result of the > addition was exactly zero (so the c...

...signedness in fusedMultiplyAdd: /* If two numbers add (exactly) to zero, IEEE 754 decrees it is a positive zero unless rounding to minus infinity, except that adding two like-signed zeroes gives that zero. */ if (category == fcZero && sign != addend.sign) sign = (rounding_mode == rmTowardNegative); The test "category == fcZero" tells us that the result was zero after rounding back down to standard precision, but since the addition is carried out in extended precision this doesn't guarantee that the result of the addition was exactly zero (so the comment text may not appl...

This patch supplies software IEEE floating point support. The comment from the patch reproduced below says all there is to say. This patch contains the prior "cleanup" patch; please don't apply that one. Please let me know of any bugs. It is tested reasonably well, but until I put together random tests it's hard to have 100% confidence. Neil. /* A self-contained host- and