From cd18dc8525a275323819ac4c7826cc3404202f7b Mon Sep 17 00:00:00 2001
From: Szabolcs Nagy <nsz@port70.net>
Date: Thu, 15 Aug 2013 10:13:02 +0000
Subject: [PATCH] math: fix tgamma to raise underflow for large negative values

---
 src/math/tgamma.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/math/tgamma.c b/src/math/tgamma.c
index 691e86a4..f91af735 100644
--- a/src/math/tgamma.c
+++ b/src/math/tgamma.c
@@ -137,6 +137,7 @@ double tgamma(double x)
 	/* x =< -184: tgamma(x)=+-0 with underflow */
 	if (absx >= 184) {
 		if (x < 0) {
+			FORCE_EVAL((float)(0x1p-126/x));
 			if (floor(x) * 0.5 == floor(x * 0.5))
 				return 0;
 			return -0.0;
-- 
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