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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.
This commit is contained in:
Szabolcs Nagy 2017-10-03 18:12:42 +01:00
parent 8f8f8ef7ab
commit 86c27ade1e
3 changed files with 14 additions and 8 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
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> 2017-10-04 Szabolcs Nagy <szabolcs.nagy@arm.com>
[BZ #22243] [BZ #22243]

10
sysdeps/ieee754/dbl-64/e_jn.c
View File

@ -268,11 +268,6 @@ __ieee754_yn (int n, double x)
/* if Y(n,NaN) is NaN */ /* if Y(n,NaN) is NaN */
if (__glibc_unlikely ((ix | ((uint32_t) (lx | -lx)) >> 31) > 0x7ff00000)) if (__glibc_unlikely ((ix | ((uint32_t) (lx | -lx)) >> 31) > 0x7ff00000))
return x + x; 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; sign = 1;
if (n < 0) if (n < 0)
{ {
@ -281,6 +276,11 @@ __ieee754_yn (int n, double x)
} }
if (n == 0) if (n == 0)
return (__ieee754_y0 (x)); 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); SET_RESTORE_ROUND (FE_TONEAREST);
if (n == 1) if (n == 1)

6
sysdeps/ieee754/flt-32/e_jnf.c
View File

@ -194,15 +194,15 @@ __ieee754_ynf(int n, float x)
ix = 0x7fffffff&hx; ix = 0x7fffffff&hx;
/* if Y(n,NaN) is NaN */ /* if Y(n,NaN) is NaN */
if(__builtin_expect(ix>0x7f800000, 0)) return x+x; 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; sign = 1;
if(n<0){ if(n<0){
n = -n; n = -n;
sign = 1 - ((n&1)<<1); sign = 1 - ((n&1)<<1);
} }
if(n==0) return(__ieee754_y0f(x)); 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); SET_RESTORE_ROUNDF (FE_TONEAREST);
if(n==1) { if(n==1) {
ret = sign*__ieee754_y1f(x); ret = sign*__ieee754_y1f(x);