Update.

	* sysdeps/i386/fpu/e_scalb.S: Handle NaN as first parameter correctly.
	* sysdeps/i386/fpu/e_scalbf.S: Likewise.
	* sysdeps/i386/fpu/e_scalbl.S: Likewise.
	* math/w_scalb.c: Don't use matherr except in SVID mode.
	* math/w_scalbf.c: Likewise.
	* math/w_scalbl.c: Likewise.
	* math/test-misc.c: Add test for NaN and scalbl.
	Reported by Fred J. Tydeman <tydeman@tybor.com>.

2000-12-04  Ulrich Drepper  <drepper@redhat.com>

4 files changed, 50 insertions, 5 deletions

diff --git a/math/test-misc.c b/math/test-misc.c
index 098695f73f..514035554c 100644
--- a/math/test-misc.c
+++ b/math/test-misc.c
@@ -19,6 +19,7 @@
 
 #include <math.h>
 #include <stdio.h>
+#include <string.h>
 
 
 int
@@ -75,6 +76,26 @@ main (void)
       }
   }
 # endif
+
+#if 0
+  {
+    int e;
+    long double r = frexpl (LDBL_MIN * LDBL_EPSILON, &e);
+
+    if (r != 0.5)
+      {
+	printf ("frexpl (LDBL_MIN * LDBL_EPSILON, ...): mantissa wrong: %Lg\n",
+		r);
+	result = 1;
+      }
+    else if (e != -16444)
+      {
+	printf ("frexpl (LDBL_MIN * LDBL_EPSILON, ...): exponent wrong: %d\n",
+		e);
+	result = 1;
+      }
+  }
+#endif
 #endif
 
   {
@@ -120,8 +141,9 @@ main (void)
     }
   if (fpclassify (nextafterl (LDBL_MIN, LDBL_MIN / 2.0)) != FP_SUBNORMAL)
     {
-      printf ("fpclassify (LDBL_MIN-epsilon) failed: %d\n",
-	      fpclassify (nextafterl (LDBL_MIN, LDBL_MIN / 2.0)));
+      printf ("fpclassify (LDBL_MIN-epsilon) failed: %d (%Lg)\n",
+	      fpclassify (nextafterl (LDBL_MIN, LDBL_MIN / 2.0)),
+	      nextafterl (LDBL_MIN, LDBL_MIN / 2.0));
       result = 1;
     }
 #endif
@@ -161,6 +183,29 @@ main (void)
 	result = 1;
       }
   }
+
+  /* Special NaNs in x86 long double.  Test for scalbl.  */
+  {
+    union
+    {
+      char b[10];
+      long double d;
+    } u =
+      { .b = { 0, 1, 0, 0, 0, 0, 0, 0xc0, 0xff, 0x7f } };
+    long double r;
+
+    r = scalbl (u.d, 0.0);
+    if (!isnan (r))
+      {
+	puts ("scalbl(NaN, 0) does not return NaN");
+	result = 1;
+      }
+    else if (memcmp (&r, &u.d, sizeof (double)) != 0)
+      {
+	puts ("scalbl(NaN, 0) does not return the same NaN");
+	result = 1;
+      }
+  }
 #endif
 
   return result;
diff --git a/math/w_scalb.c b/math/w_scalb.c
index e5c407a435..c981b858a9 100644
--- a/math/w_scalb.c
+++ b/math/w_scalb.c
@@ -45,7 +45,7 @@ static char rcsid[] = "$NetBSD: w_scalb.c,v 1.6 1995/05/10 20:49:48 jtc Exp $";
 #else
 	double z;
 	z = __ieee754_scalb(x,fn);
-	if(_LIB_VERSION == _IEEE_) return z;
+	if(_LIB_VERSION != _SVID_) return z;
 	if(!(__finite(z)||__isnan(z))&&__finite(x)) {
 	    return __kernel_standard(x,(double)fn,32); /* scalb overflow */
 	}
diff --git a/math/w_scalbf.c b/math/w_scalbf.c
index 488a717503..51056083e8 100644
--- a/math/w_scalbf.c
+++ b/math/w_scalbf.c
@@ -48,7 +48,7 @@ static char rcsid[] = "$NetBSD: w_scalbf.c,v 1.3 1995/05/10 20:49:50 jtc Exp $";
 #else
 	float z;
 	z = __ieee754_scalbf(x,fn);
-	if(_LIB_VERSION == _IEEE_) return z;
+	if(_LIB_VERSION != _SVID_) return z;
 	if(!(__finitef(z)||__isnanf(z))&&__finitef(x)) {
 	    /* scalbf overflow */
 	    return (float)__kernel_standard((double)x,(double)fn,132);
diff --git a/math/w_scalbl.c b/math/w_scalbl.c
index 3ca8d9601d..6a7d307104 100644
--- a/math/w_scalbl.c
+++ b/math/w_scalbl.c
@@ -49,7 +49,7 @@ static char rcsid[] = "$NetBSD: $";
 #else
 	long double z;
 	z = __ieee754_scalbl(x,fn);
-	if(_LIB_VERSION == _IEEE_) return z;
+	if(_LIB_VERSION != _SVID_) return z;
 	if(!(__finitel(z)||__isnanl(z))&&__finitel(x)) {
 	    return __kernel_standard(x,(double)fn,232); /* scalb overflow */
 	}