fix integer overflow in WIFSTOPPED macro

[musl] / src / math / ilogbl.c

diff --git a/src/math/ilogbl.c b/src/math/ilogbl.c
index 1512934..7b1a9cf 100644 (file)
--- a/src/math/ilogbl.c
+++ b/src/math/ilogbl.c
@@ -9,9 +9,10 @@ int ilogbl(long double x)
 #elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
 int ilogbl(long double x)
 {
+       #pragma STDC FENV_ACCESS ON
        union ldshape u = {x};
-       uint64_t m = u.bits.m;
-       int e = u.bits.exp;
+       uint64_t m = u.i.m;
+       int e = u.i.se & 0x7fff;
 
        if (!e) {
                if (m == 0) {
@@ -19,13 +20,35 @@ int ilogbl(long double x)
                        return FP_ILOGB0;
                }
                /* subnormal x */
-               for (e = -0x3fff+1; m < (uint64_t)1<<63; e--, m<<=1);
+               for (e = -0x3fff+1; m>>63 == 0; e--, m<<=1);
                return e;
        }
        if (e == 0x7fff) {
                FORCE_EVAL(0/0.0f);
-               /* in ld80 msb is set in inf */
-               return m & (uint64_t)-1>>1 ? FP_ILOGBNAN : INT_MAX;
+               return m<<1 ? FP_ILOGBNAN : INT_MAX;
+       }
+       return e - 0x3fff;
+}
+#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
+int ilogbl(long double x)
+{
+       #pragma STDC FENV_ACCESS ON
+       union ldshape u = {x};
+       int e = u.i.se & 0x7fff;
+
+       if (!e) {
+               if (x == 0) {
+                       FORCE_EVAL(0/0.0f);
+                       return FP_ILOGB0;
+               }
+               /* subnormal x */
+               x *= 0x1p120;
+               return ilogbl(x) - 120;
+       }
+       if (e == 0x7fff) {
+               FORCE_EVAL(0/0.0f);
+               u.i.se = 0;
+               return u.f ? FP_ILOGBNAN : INT_MAX;
        }
        return e - 0x3fff;
 }