Fix remainder (NaN, 0)

4 files changed, 25 insertions, 9 deletions

diff --git a/math/libm-test.inc b/math/libm-test.inc
index 70d936c..96da7cd 100644
--- a/math/libm-test.inc
+++ b/math/libm-test.inc
@@ -189,7 +189,7 @@ static FLOAT max_error, real_max_error, imag_max_error;
 
 
 #define MANT_DIG CHOOSE ((LDBL_MANT_DIG-1), (DBL_MANT_DIG-1), (FLT_MANT_DIG-1),  \
-                         (LDBL_MANT_DIG-1), (DBL_MANT_DIG-1), (FLT_MANT_DIG-1))
+			 (LDBL_MANT_DIG-1), (DBL_MANT_DIG-1), (FLT_MANT_DIG-1))
 
 static void
 init_max_error (void)
@@ -4940,11 +4940,27 @@ remainder_test (void)
 
   START (remainder);
 
+  errno = 0;
   TEST_ff_f (remainder, 1, 0, nan_value, INVALID_EXCEPTION);
+  check_int ("errno for remainder(1, 0) = EDOM ", errno, EDOM, 0, 0, 0);
+  errno = 0;
   TEST_ff_f (remainder, 1, minus_zero, nan_value, INVALID_EXCEPTION);
+  check_int ("errno for remainder(1, -0) = EDOM ", errno, EDOM, 0, 0, 0);
+  errno = 0;
   TEST_ff_f (remainder, plus_infty, 1, nan_value, INVALID_EXCEPTION);
+  check_int ("errno for remainder(INF, 1) = EDOM ", errno, EDOM, 0, 0, 0);
+  errno = 0;
   TEST_ff_f (remainder, minus_infty, 1, nan_value, INVALID_EXCEPTION);
+  check_int ("errno for remainder(-INF, 1) = EDOM ", errno, EDOM, 0, 0, 0);
+  errno = 0;
   TEST_ff_f (remainder, nan_value, nan_value, nan_value);
+  check_int ("errno for remainder(NAN, NAN) unchanged", errno, 0, 0, 0, 0);
+  errno = 0;
+  TEST_ff_f (remainder, 0, nan_value, nan_value);
+  check_int ("errno for remainder(0, NAN) unchanged", errno, 0, 0, 0, 0);
+  errno = 0;
+  TEST_ff_f (remainder, nan_value, 0, nan_value);
+  check_int ("errno for remainder(NaN, 0) unchanged", errno, 0, 0, 0, 0);
 
   TEST_ff_f (remainder, 1.625, 1.0, -0.375);
   TEST_ff_f (remainder, -1.625, 1.0, 0.375);
diff --git a/math/w_remainder.c b/math/w_remainder.c
index 9d7a7c5..9ff53e3 100644
--- a/math/w_remainder.c
+++ b/math/w_remainder.c
@@ -33,8 +33,8 @@ static char rcsid[] = "$NetBSD: w_remainder.c,v 1.6 1995/05/10 20:49:44 jtc Exp
 #else
 	double z;
 	z = __ieee754_remainder(x,y);
-	if(_LIB_VERSION == _IEEE_ || __isnan(y)) return z;
-	if(y==0.0)
+	if(_LIB_VERSION == _IEEE_ || __isnan(y) || __isnan(x)) return z;
+	if(y==0.0 || __isinf(x))
 	    return __kernel_standard(x,y,28); /* remainder(x,0) */
 	else
 	    return z;
diff --git a/math/w_remainderf.c b/math/w_remainderf.c
index 486e626..ab1ea2d 100644
--- a/math/w_remainderf.c
+++ b/math/w_remainderf.c
@@ -8,7 +8,7 @@
  *
  * Developed at SunPro, a Sun Microsystems, Inc. business.
  * Permission to use, copy, modify, and distribute this
- * software is freely granted, provided that this notice 
+ * software is freely granted, provided that this notice
  * is preserved.
  * ====================================================
  */
@@ -17,7 +17,7 @@
 static char rcsid[] = "$NetBSD: w_remainderf.c,v 1.3 1995/05/10 20:49:46 jtc Exp $";
 #endif
 
-/* 
+/*
  * wrapper remainderf(x,p)
  */
 
@@ -36,8 +36,8 @@ static char rcsid[] = "$NetBSD: w_remainderf.c,v 1.3 1995/05/10 20:49:46 jtc Exp
 #else
 	float z;
 	z = __ieee754_remainderf(x,y);
-	if(_LIB_VERSION == _IEEE_ || __isnanf(y)) return z;
-	if(y==(float)0.0) 
+	if(_LIB_VERSION == _IEEE_ || __isnanf(y) || __isnanf(x)) return z;
+	if(y==(float)0.0 || __isinff(x))
 	    /* remainder(x,0) */
 	    return (float)__kernel_standard((double)x,(double)y,128);
 	else
diff --git a/math/w_remainderl.c b/math/w_remainderl.c
index 7635fb9..e5460cd 100644
--- a/math/w_remainderl.c
+++ b/math/w_remainderl.c
@@ -38,8 +38,8 @@ static char rcsid[] = "$NetBSD: $";
 #else
 	long double z;
 	z = __ieee754_remainderl(x,y);
-	if(_LIB_VERSION == _IEEE_ || __isnanl(y)) return z;
-	if(y==0.0)
+	if(_LIB_VERSION == _IEEE_ || __isnanl(y) || __isnanl(x)) return z;
+	if(y==0.0 || __isinfl(x))
 	    return __kernel_standard(x,y,228); /* remainder(x,0) */
 	else
 	    return z;