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Diffstat (limited to 'manual/arith.texi')
| -rw-r--r-- | manual/arith.texi | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/manual/arith.texi b/manual/arith.texi index 41ab577237..a20a4dec6c 100644 --- a/manual/arith.texi +++ b/manual/arith.texi @@ -939,6 +939,11 @@ guaranteed; it is intended that @theglibc{} should set it when the underflow is to an appropriately signed zero, but not necessarily for other underflows. +When a math function has an argument that is a signaling NaN, +@theglibc{} does not consider this a domain error, so @code{errno} is +unchanged, but the invalid exception is still raised (except for a few +functions that are specified to handle signaling NaNs differently). + Some of the math functions are defined mathematically to result in a complex value over parts of their domains. The most familiar example of this is taking the square root of a negative number. The complex math |