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-rw-r--r--libm/e_lgamma_r.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/libm/e_lgamma_r.c b/libm/e_lgamma_r.c
index 2b1fde78c..23c96d808 100644
--- a/libm/e_lgamma_r.c
+++ b/libm/e_lgamma_r.c
@@ -208,7 +208,11 @@ double attribute_hidden __ieee754_lgamma_r(double x, int *signgamp)
*signgamp = 1;
ix = hx&0x7fffffff;
if(ix>=0x7ff00000) return x*x;
- if((ix|lx)==0) return one/zero;
+ if((ix|lx)==0) {
+ if (__signbitl(x))
+ *signgamp = -1;
+ return one/zero;
+ }
if(ix<0x3b900000) { /* |x|<2**-70, return -log(|x|) */
if(hx<0) {
*signgamp = -1;