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-rw-r--r--src/math/fmal.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/math/fmal.c b/src/math/fmal.c
index ccbe434d..87e30fcf 100644
--- a/src/math/fmal.c
+++ b/src/math/fmal.c
@@ -262,6 +262,8 @@ long double fmal(long double x, long double y, long double z)
/*
* There is no need to worry about double rounding in directed
* rounding modes.
+ * TODO: underflow is not raised correctly, example in downward rounding:
+ * fmal(0x1.0000000001p-16000L, 0x1.0000000001p-400L, -0x1p-16440L)
*/
fesetround(oround);
adj = r.lo + xy.lo;