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-rw-r--r--math/s_cprojf.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/math/s_cprojf.c b/math/s_cprojf.c
index 188bbe3beb..e4dbc181bd 100644
--- a/math/s_cprojf.c
+++ b/math/s_cprojf.c
@@ -24,9 +24,7 @@
 __complex__ float
 __cprojf (__complex__ float x)
 {
-  if (isnan (__real__ x) && isnan (__imag__ x))
-    return x;
-  else if (!isfinite (__real__ x) || !isfinite (__imag__ x))
+  if (__isinf_nsf (__real__ x) || __isinf_nsf (__imag__ x))
     {
       __complex__ float res;