PowerPC floating point little-endian [3 of 15]

http://sourceware.org/ml/libc-alpha/2013-08/msg00083.html

Further replacement of ieee854 macros and unions.  These files also
have some optimisations for comparison against 0.0L, infinity and nan.
Since the ABI specifies that the high double of an IBM long double
pair is the value rounded to double, a high double of 0.0 means the
low double must also be 0.0.  The ABI also says that infinity and
nan are encoded in the high double, with the low double unspecified.
This means that tests for 0.0L, +/-Infinity and +/-NaN need only check
the high double.

	* sysdeps/ieee754/ldbl-128ibm/e_atan2l.c (__ieee754_atan2l): Rewrite
	all uses of ieee854 long double macros and unions.  Simplify tests
	for long doubles that are fully specified by the high double.
	* sysdeps/ieee754/ldbl-128ibm/e_gammal_r.c (__ieee754_gammal_r):
	Likewise.
	* sysdeps/ieee754/ldbl-128ibm/e_ilogbl.c (__ieee754_ilogbl): Likewise.
	Remove dead code too.
	* sysdeps/ieee754/ldbl-128ibm/e_jnl.c (__ieee754_jnl): Likewise.
	(__ieee754_ynl): Likewise.
	* sysdeps/ieee754/ldbl-128ibm/e_log10l.c (__ieee754_log10l): Likewise.
	* sysdeps/ieee754/ldbl-128ibm/e_logl.c (__ieee754_logl): Likewise.
	* sysdeps/ieee754/ldbl-128ibm/e_powl.c (__ieee754_powl): Likewise.
	Remove dead code too.
	* sysdeps/ieee754/ldbl-128ibm/k_tanl.c (__kernel_tanl): Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_expm1l.c (__expm1l): Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_frexpl.c (__frexpl): Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_isinf_nsl.c (__isinf_nsl): Likewise.
	Simplify.
	* sysdeps/ieee754/ldbl-128ibm/s_isinfl.c (___isinfl): Likewise.
	Simplify.
	* sysdeps/ieee754/ldbl-128ibm/s_log1pl.c (__log1pl): Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_modfl.c (__modfl): Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c (__nextafterl): Likewise.
	Comment on variable precision.
	* sysdeps/ieee754/ldbl-128ibm/s_nexttoward.c (__nexttoward): Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_nexttowardf.c (__nexttowardf):
	Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_remquol.c (__remquol): Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_scalblnl.c (__scalblnl): Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_scalbnl.c (__scalbnl): Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_tanhl.c (__tanhl): Likewise.
	* sysdeps/powerpc/fpu/libm-test-ulps: Adjust tan_towardzero ulps.

1 files changed, 16 insertions, 16 deletions

diff --git a/sysdeps/ieee754/ldbl-128ibm/e_jnl.c b/sysdeps/ieee754/ldbl-128ibm/e_jnl.c
index 40012e4..817977d 100644
--- a/sysdeps/ieee754/ldbl-128ibm/e_jnl.c
+++ b/sysdeps/ieee754/ldbl-128ibm/e_jnl.c
@@ -70,26 +70,25 @@ static const long double
 long double
 __ieee754_jnl (int n, long double x)
 {
-  u_int32_t se;
+  uint32_t se, lx;
   int32_t i, ix, sgn;
   long double a, b, temp, di;
   long double z, w;
-  ieee854_long_double_shape_type u;
+  double xhi;
 
 
   /* J(-n,x) = (-1)^n * J(n, x), J(n, -x) = (-1)^n * J(n, x)
    * Thus, J(-n,x) = J(n,-x)
    */
 
-  u.value = x;
-  se = u.parts32.w0;
+  xhi = ldbl_high (x);
+  EXTRACT_WORDS (se, lx, xhi);
   ix = se & 0x7fffffff;
 
   /* if J(n,NaN) is NaN */
   if (ix >= 0x7ff00000)
     {
-      if ((u.parts32.w0 & 0xfffff) | u.parts32.w1
-	  | (u.parts32.w2 & 0x7fffffff) | u.parts32.w3)
+      if (((ix - 0x7ff00000) | lx) != 0)
 	return x + x;
     }
 
@@ -298,21 +297,20 @@ strong_alias (__ieee754_jnl, __jnl_finite)
 long double
 __ieee754_ynl (int n, long double x)
 {
-  u_int32_t se;
+  uint32_t se, lx;
   int32_t i, ix;
   int32_t sign;
   long double a, b, temp;
-  ieee854_long_double_shape_type u;
+  double xhi;
 
-  u.value = x;
-  se = u.parts32.w0;
+  xhi = ldbl_high (x);
+  EXTRACT_WORDS (se, lx, xhi);
   ix = se & 0x7fffffff;
 
   /* if Y(n,NaN) is NaN */
   if (ix >= 0x7ff00000)
     {
-      if ((u.parts32.w0 & 0xfffff) | u.parts32.w1
-	  | (u.parts32.w2 & 0x7fffffff) | u.parts32.w3)
+      if (((ix - 0x7ff00000) | lx) != 0)
 	return x + x;
     }
   if (x <= 0.0L)
@@ -377,14 +375,16 @@ __ieee754_ynl (int n, long double x)
       a = __ieee754_y0l (x);
       b = __ieee754_y1l (x);
       /* quit if b is -inf */
-      u.value = b;
-      se = u.parts32.w0 & 0xfff00000;
+      xhi = ldbl_high (b);
+      GET_HIGH_WORD (se, xhi);
+      se &= 0xfff00000;
       for (i = 1; i < n && se != 0xfff00000; i++)
 	{
 	  temp = b;
 	  b = ((long double) (i + i) / x) * b - a;
-	  u.value = b;
-	  se = u.parts32.w0 & 0xfff00000;
+	  xhi = ldbl_high (b);
+	  GET_HIGH_WORD (se, xhi);
+	  se &= 0xfff00000;
 	  a = temp;
 	}
     }