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authorSzabolcs Nagy <szabolcs.nagy@arm.com>2017-10-03 18:12:42 +0100
committerSzabolcs Nagy <szabolcs.nagy@arm.com>2017-10-04 10:15:12 +0100
commit86c27ade1e44e29922d33676f950f7334edb37a7 (patch)
treef1a56c25057b1af6d66df83321beb906c1914fd6
parent8f8f8ef7aba40ef883291e4c4d95a419c3327d70 (diff)
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[BZ #22244] Fix yn(n,0) without SVID wrapper
Without SVID compat wrapper yn(n,0) and ynf(n,0) does not raise
the divide-by-zero excpetion and it may return inf with the wrong
sign for n < 0.

	[BZ #22244]
	* sysdeps/ieee754/dbl-64/e_jn.c (__ieee754_yn): Fix x == 0 case.
	* sysdeps/ieee754/flt-32/e_jnf.c (__ieee754_ynf): Likewise.
-rw-r--r--ChangeLog6
-rw-r--r--sysdeps/ieee754/dbl-64/e_jn.c10
-rw-r--r--sysdeps/ieee754/flt-32/e_jnf.c6
3 files changed, 14 insertions, 8 deletions
diff --git a/ChangeLog b/ChangeLog
index 6161509499..55295ba48e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,11 @@
 2017-10-04  Szabolcs Nagy  <szabolcs.nagy@arm.com>
 
+	[BZ #22244]
+	* sysdeps/ieee754/dbl-64/e_jn.c (__ieee754_yn): Fix x == 0 case.
+	* sysdeps/ieee754/flt-32/e_jnf.c (__ieee754_ynf): Likewise.
+
+2017-10-04  Szabolcs Nagy  <szabolcs.nagy@arm.com>
+
 	[BZ #22243]
 	* sysdeps/ieee754/dbl-64/wordsize-64/e_log10.c (__ieee754_log10): Use fabs.
 	* sysdeps/ieee754/dbl-64/wordsize-64/e_log2.c (__ieee754_log2): Likewise.
diff --git a/sysdeps/ieee754/dbl-64/e_jn.c b/sysdeps/ieee754/dbl-64/e_jn.c
index 3ac91df2b0..a244df0e0a 100644
--- a/sysdeps/ieee754/dbl-64/e_jn.c
+++ b/sysdeps/ieee754/dbl-64/e_jn.c
@@ -268,11 +268,6 @@ __ieee754_yn (int n, double x)
   /* if Y(n,NaN) is NaN */
   if (__glibc_unlikely ((ix | ((uint32_t) (lx | -lx)) >> 31) > 0x7ff00000))
     return x + x;
-  if (__glibc_unlikely ((ix | lx) == 0))
-    return -HUGE_VAL + x;
-  /* -inf and overflow exception.  */;
-  if (__glibc_unlikely (hx < 0))
-    return zero / (zero * x);
   sign = 1;
   if (n < 0)
     {
@@ -281,6 +276,11 @@ __ieee754_yn (int n, double x)
     }
   if (n == 0)
     return (__ieee754_y0 (x));
+  if (__glibc_unlikely ((ix | lx) == 0))
+    return -sign / zero;
+  /* -inf and overflow exception.  */;
+  if (__glibc_unlikely (hx < 0))
+    return zero / (zero * x);
   {
     SET_RESTORE_ROUND (FE_TONEAREST);
     if (n == 1)
diff --git a/sysdeps/ieee754/flt-32/e_jnf.c b/sysdeps/ieee754/flt-32/e_jnf.c
index 82b9ba3300..4b78ecea6c 100644
--- a/sysdeps/ieee754/flt-32/e_jnf.c
+++ b/sysdeps/ieee754/flt-32/e_jnf.c
@@ -194,15 +194,15 @@ __ieee754_ynf(int n, float x)
 	ix = 0x7fffffff&hx;
     /* if Y(n,NaN) is NaN */
 	if(__builtin_expect(ix>0x7f800000, 0)) return x+x;
-	if(__builtin_expect(ix==0, 0))
-		return -HUGE_VALF+x;  /* -inf and overflow exception.  */
-	if(__builtin_expect(hx<0, 0)) return zero/(zero*x);
 	sign = 1;
 	if(n<0){
 		n = -n;
 		sign = 1 - ((n&1)<<1);
 	}
 	if(n==0) return(__ieee754_y0f(x));
+	if(__builtin_expect(ix==0, 0))
+		return -sign/zero;
+	if(__builtin_expect(hx<0, 0)) return zero/(zero*x);
 	SET_RESTORE_ROUNDF (FE_TONEAREST);
 	if(n==1) {
 	    ret = sign*__ieee754_y1f(x);