X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fmath%2F__fpclassifyl.c;h=e41781b689af7f7db420fc437cc4a72e4dd00c33;hb=29e4319178cbc2a4e9f058a99ae8098d4b6ac055;hp=a4e354ce11ddbd54528cd4775aa507e29828fa33;hpb=daaef3552d9f1fa9b6dc839b66637df3672b0541;p=musl

diff --git a/src/math/__fpclassifyl.c b/src/math/__fpclassifyl.c
index a4e354ce..e41781b6 100644
--- a/src/math/__fpclassifyl.c
+++ b/src/math/__fpclassifyl.c
@@ -1,16 +1,42 @@
-#include <stdint.h>
-#include <math.h>
+#include "libm.h"
 
-/* FIXME: move this to arch-specific file */
-int __fpclassifyl(long double __x)
+#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
+int __fpclassifyl(long double x)
 {
-	union {
-		long double __ld;
-		__uint16_t __hw[5];
-		int64_t __m;
-	} __y = { __x };
-	int __ee = __y.__hw[4]&0x7fff;
-	if (!__ee) return __y.__m ? FP_SUBNORMAL : FP_ZERO;
-	if (__ee==0x7fff) return __y.__m ? FP_NAN : FP_INFINITE;
-	return __y.__m < 0 ? FP_NORMAL : FP_NAN;
+	return __fpclassify(x);
 }
+#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
+int __fpclassifyl(long double x)
+{
+	union ldshape u = {x};
+	int e = u.i.se & 0x7fff;
+	int msb = u.i.m>>63;
+	if (!e && !msb)
+		return u.i.m ? FP_SUBNORMAL : FP_ZERO;
+	if (e == 0x7fff) {
+		/* The x86 variant of 80-bit extended precision only admits
+		 * one representation of each infinity, with the mantissa msb
+		 * necessarily set. The version with it clear is invalid/nan.
+		 * The m68k variant, however, allows either, and tooling uses
+		 * the version with it clear. */
+		if (__BYTE_ORDER == __LITTLE_ENDIAN && !msb)
+			return FP_NAN;
+		return u.i.m << 1 ? FP_NAN : FP_INFINITE;
+	}
+	if (!msb)
+		return FP_NAN;
+	return FP_NORMAL;
+}
+#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
+int __fpclassifyl(long double x)
+{
+	union ldshape u = {x};
+	int e = u.i.se & 0x7fff;
+	u.i.se = 0;
+	if (!e)
+		return u.i2.lo | u.i2.hi ? FP_SUBNORMAL : FP_ZERO;
+	if (e == 0x7fff)
+		return u.i2.lo | u.i2.hi ? FP_NAN : FP_INFINITE;
+	return FP_NORMAL;
+}
+#endif