X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fmath%2Filogbl.c;h=7b1a9cf8d007ff16c1d6fe072916a5a8a226e3e3;hb=ea3b40a321e751e016948087ef23ae7b9e8e0150;hp=1512934f18c97df352ebb7106a22212bb7241246;hpb=be81f51030d90de8d5eb0b65dbdab3032d5cae23;p=musl

diff --git a/src/math/ilogbl.c b/src/math/ilogbl.c
index 1512934f..7b1a9cf8 100644
--- 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;
 }