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authorJoseph Myers <joseph@codesourcery.com>2015-08-06 23:01:09 +0000
committerJoseph Myers <joseph@codesourcery.com>2015-08-06 23:01:09 +0000
commit5e29dd573777197fc4d12c1bdea8f6d04e505391 (patch)
tree750cd162b91bfad88eaf7904cf33977a248e3817 /sysdeps/ieee754/ldbl-128ibm
parent2ba30a182ca50ac07f45ed1f813a85ccafaed85d (diff)
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Fix sinh missing underflows (bug 16519).
Similar to various other bugs in this area, some sinh implementations
do not raise the underflow exception for subnormal arguments, when the
result is tiny and inexact.  This patch forces the exception in a
similar way to previous fixes.

Tested for x86_64, x86, mips64 and powerpc.

	[BZ #16519]
	* sysdeps/ieee754/dbl-64/e_sinh.c: Include <float.h>.
	(__ieee754_sinh): Force underflow exception for arguments with
	small absolute value.
	* sysdeps/ieee754/flt-32/e_sinhf.c: Include <float.h>.
	(__ieee754_sinhf): Force underflow exception for arguments with
	small absolute value.
	* sysdeps/ieee754/ldbl-128/e_sinhl.c: Include <float.h>.
	(__ieee754_sinhl): Force underflow exception for arguments with
	small absolute value.
	* sysdeps/ieee754/ldbl-128ibm/e_sinhl.c: Include <float.h>.
	(__ieee754_sinhl): Force underflow exception for arguments with
	small absolute value.
	* sysdeps/ieee754/ldbl-96/e_sinhl.c: Include <float.h>.
	(__ieee754_sinhl): Force underflow exception for arguments with
	small absolute value.
	* math/auto-libm-test-in: Add more tests of sinh.
	* math/auto-libm-test-out: Regenerated.
	* sysdeps/i386/fpu/libm-test-ulps: Update.
Diffstat (limited to 'sysdeps/ieee754/ldbl-128ibm')
-rw-r--r--sysdeps/ieee754/ldbl-128ibm/e_sinhl.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm/e_sinhl.c b/sysdeps/ieee754/ldbl-128ibm/e_sinhl.c
index 1790bef87e..08e5d86b41 100644
--- a/sysdeps/ieee754/ldbl-128ibm/e_sinhl.c
+++ b/sysdeps/ieee754/ldbl-128ibm/e_sinhl.c
@@ -28,6 +28,7 @@
  *	only sinh(0)=0 is exact for finite x.
  */
 
+#include <float.h>
 #include <math.h>
 #include <math_private.h>
 
@@ -52,8 +53,14 @@ __ieee754_sinhl(long double x)
 	if (jx<0) h = -h;
     /* |x| in [0,40], return sign(x)*0.5*(E+E/(E+1))) */
 	if (ix < 0x4044000000000000LL) {	/* |x|<40 */
-	    if (ix<0x3e20000000000000LL)	/* |x|<2**-29 */
+	    if (ix<0x3e20000000000000LL) {	/* |x|<2**-29 */
+		if (fabsl (x) < LDBL_MIN)
+		  {
+		    long double force_underflow = x * x;
+		    math_force_eval (force_underflow);
+		  }
 		if(shuge+x>one) return x;/* sinhl(tiny) = tiny with inexact */
+	    }
 	    t = __expm1l(fabsl(x));
 	    if(ix<0x3ff0000000000000LL) return h*(2.0*t-t*t/(t+one));
 	    w = t/(t+one);