From faa600384c7e5301fab11bde4b7db5a5e29262eb Mon Sep 17 00:00:00 2001 From: Michael Mclaughlin Date: Thu, 17 Oct 2013 13:11:27 +0100 Subject: [PATCH] Bugfix: sign of zero when x < 0 and x + (-x) = 0 --- bignumber.js | 17 +++++++++++++---- bignumber.min.js | 2 +- 2 files changed, 14 insertions(+), 5 deletions(-) diff --git a/bignumber.js b/bignumber.js index c93a122..cd14e12 100644 --- a/bignumber.js +++ b/bignumber.js @@ -1107,7 +1107,8 @@ ? x // Both are zero. - : 0 ) + // IEEE 754 (2008) 6.3: n - n = -0 when rounding to -Infinity + : ROUNDING_MODE == 3 ? -0 : 0 ) } } @@ -1178,7 +1179,15 @@ // Underflow? if ( ye < MIN_EXP || !xc[0] ) { - // Result must be zero. + /* + * Following IEEE 754 (2008) 6.3, + * n - n = +0 but n - n = -0 when rounding towards -Infinity. + */ + if ( !xc[0] ) { + y['s'] = ROUNDING_MODE == 3 ? -1 : 1 + } + + // Result is zero. xc = [ye = 0] } @@ -1296,9 +1305,9 @@ // y is non-zero? return yc[0] ? y - : new BigNumber( xc[0] - // x is non-zero? + // x is non-zero? + : new BigNumber( xc[0] ? x // Both are zero. 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