long double math fixes for LD64

[libm] / src / math / ilogbl.c

diff --git a/src/math/ilogbl.c b/src/math/ilogbl.c
index acaf312..ed9ddcb 100644 (file)
--- a/src/math/ilogbl.c
+++ b/src/math/ilogbl.c
@@ -1,11 +1,12 @@
 #include <limits.h>
 #include "libm.h"
-#if LD64
+
+#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
 int ilogbl(long double x)
 {
        return ilogb(x);
 }
-#elif LD80
+#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
 int ilogbl(long double x)
 {
        union ldshape u = {x};
@@ -21,7 +22,7 @@ int ilogbl(long double x)
        }
        if (e == 0x7fff)
                /* in ld80 msb is set in inf */
-               return m & ~(uint64_t)1<<63 ? FP_ILOGBNAN : INT_MAX;
+               return m & (uint64_t)-1>>1 ? FP_ILOGBNAN : INT_MAX;
        return e - 0x3fff;
 }
 #endif