Mark more libm tests with xfail-rounding:ldbl-128ibm.

This patch marks more libm tests as expected to fail for ldbl-128ibm
in non-default rounding modes.  Given this, my expm1l fix
<https://sourceware.org/ml/libc-alpha/2014-01/msg00135.html> and my
libgcc fix <http://gcc.gnu.org/ml/gcc-patches/2014-01/msg00157.html>
for spurious overflows, the remaining failures in test-ldouble.out
(for powerpc32 hard float) are small ulps, spurious underflow and
inexact exceptions (the former probably arising from libgcc bugs
though I haven't checked each case; the latter are barely meaningful
for this format anyway when basic arithmetic isn't correctly rounding,
though most of them are probably GCC bug 59412 which doesn't actually
involve long double), missing underflow exceptions from clog, ctan and
ctanh (probably one of the known bugs for another function), and logb
in round-downward mode (bug 887, though it's really a GCC bug that
we're not currently working around).

Tested for powerpc32 hard float.

	* math/auto-libm-test-in: Mark various tests with
	xfail-rounding:ldbl-128ibm.
	* math/auto-libm-test-out: Regenerated.

ChangeLog

@@ -1,5 +1,9 @@
 2014-01-07  Joseph Myers  <joseph@codesourcery.com>
 
+	* math/auto-libm-test-in: Mark various tests with
+	xfail-rounding:ldbl-128ibm.
+	* math/auto-libm-test-out: Regenerated.
+
 	[BZ #16407]
 	* sysdeps/ieee754/ldbl-128ibm/e_coshl.c (__ieee754_coshl):
 	Increase overflow threshold.

math/auto-libm-test-in

@@ -614,8 +614,9 @@ ctan 1 45
 ctan 1 47
 ctan 1 355
 ctan 1 365
-ctan 1 5680
-ctan 1 5690
+# GCC bug 59666: results on directed rounding may be incorrect.
+ctan 1 5680 xfail-rounding:ldbl-128ibm
+ctan 1 5690 xfail-rounding:ldbl-128ibm
 
 ctan 0x3.243f6cp-1 0
 
@@ -623,10 +624,11 @@ ctan 0x1p127 1
 ctan 0x1p1023 1
 ctan 0x1p16383 1
 
-ctan 50000 50000
-ctan 50000 -50000
-ctan -50000 50000
-ctan -50000 -50000
+# GCC bug 59666: results on directed rounding may be incorrect.
+ctan 50000 50000 xfail-rounding:ldbl-128ibm
+ctan 50000 -50000 xfail-rounding:ldbl-128ibm
+ctan -50000 50000 xfail-rounding:ldbl-128ibm
+ctan -50000 -50000 xfail-rounding:ldbl-128ibm
 
 ctan 0x1.921fb6p+0 0x1p-149
 ctan 0x1.921fb54442d18p+0 0x1p-1074
@@ -646,8 +648,9 @@ ctanh 45 1
 ctanh 47 1
 ctanh 355 1
 ctanh 365 1
-ctanh 5680 1
-ctanh 5690 1
+# GCC bug 59666: results on directed rounding may be incorrect.
+ctanh 5680 1 xfail-rounding:ldbl-128ibm
+ctanh 5690 1 xfail-rounding:ldbl-128ibm
 
 ctanh 0 0x3.243f6cp-1
 
@@ -655,10 +658,11 @@ ctanh 1 0x1p127
 ctanh 1 0x1p1023
 ctanh 1 0x1p16383
 
-ctanh 50000 50000
-ctanh 50000 -50000
-ctanh -50000 50000
-ctanh -50000 -50000
+# GCC bug 59666: results on directed rounding may be incorrect.
+ctanh 50000 50000 xfail-rounding:ldbl-128ibm
+ctanh 50000 -50000 xfail-rounding:ldbl-128ibm
+ctanh -50000 50000 xfail-rounding:ldbl-128ibm
+ctanh -50000 -50000 xfail-rounding:ldbl-128ibm
 
 ctanh 0x1p-149 0x1.921fb6p+0
 ctanh 0x1p-1074 0x1.921fb54442d18p+0
@@ -709,13 +713,15 @@ exp 50.0
 exp 88.72269439697265625
 exp 709.75
 # Bug 16284: results on directed rounding may be incorrect.
-exp 1000.0 xfail-rounding:dbl-64
-exp 710 xfail-rounding:dbl-64
+# GCC bug 59666: results on directed rounding may be incorrect.
+exp 1000.0 xfail-rounding:dbl-64 xfail-rounding:ldbl-128ibm
+exp 710 xfail-rounding:dbl-64 xfail-rounding:ldbl-128ibm
 exp -1234
 # Bug 16284: results on directed rounding may be incorrect.
-exp 0x2.c679d1f73f0fb628p+8 xfail-rounding:dbl-64
-exp 1e5 xfail-rounding:dbl-64
-exp max xfail-rounding:dbl-64
+# GCC bug 59666: results on directed rounding may be incorrect.
+exp 0x2.c679d1f73f0fb628p+8 xfail-rounding:dbl-64 xfail-rounding:ldbl-128ibm
+exp 1e5 xfail-rounding:dbl-64 xfail-rounding:ldbl-128ibm
+exp max xfail-rounding:dbl-64 xfail-rounding:ldbl-128ibm
 exp -7.4444006192138124e+02
 exp -0x1.75f113c30b1c8p+9
 exp -max