[pypy-svn] pypy default: Don't generate a call to libc for isinf, instead implement it directly.

[alex_gaynor]

Author: Alex Gaynor <alex.gaynor at gmail.com>
Branch: 
Changeset: r43268:c7a7acad0692
Date: 2011-04-09 19:40 -0400
http://bitbucket.org/pypy/pypy/changeset/c7a7acad0692/

Log:	Don't generate a call to libc for isinf, instead implement it
	directly.

diff --git a/pypy/translator/c/src/ll_math.h b/pypy/translator/c/src/ll_math.h
--- a/pypy/translator/c/src/ll_math.h
+++ b/pypy/translator/c/src/ll_math.h
@@ -1,8 +1,6 @@
 /* Definitions of some C99 math library functions, for those platforms
    that don't implement these functions already. */
 
-int _pypy_math_isinf(double x);
-
 double _pypy_math_acosh(double x);
 double _pypy_math_asinh(double x);
 double _pypy_math_atanh(double x);

diff --git a/pypy/translator/c/src/ll_math.c b/pypy/translator/c/src/ll_math.c
--- a/pypy/translator/c/src/ll_math.c
+++ b/pypy/translator/c/src/ll_math.c
@@ -22,12 +22,6 @@
 #endif
 #define PyPy_NAN (HUGE_VAL * 0.)
 
-int
-_pypy_math_isinf(double x)
-{
-    return PyPy_IS_INFINITY(x);
-}
-
 /* The following copyright notice applies to the original
    implementations of acosh, asinh and atanh. */
 

diff --git a/pypy/rpython/lltypesystem/module/ll_math.py b/pypy/rpython/lltypesystem/module/ll_math.py
--- a/pypy/rpython/lltypesystem/module/ll_math.py
+++ b/pypy/rpython/lltypesystem/module/ll_math.py
@@ -20,8 +20,7 @@
         separate_module_files=[cdir.join('src', 'll_math.c')],
         export_symbols=['_pypy_math_acosh', '_pypy_math_asinh',
                         '_pypy_math_atanh',
-                        '_pypy_math_expm1', '_pypy_math_log1p',
-                        '_pypy_math_isinf'],
+                        '_pypy_math_expm1', '_pypy_math_log1p'],
         )
     math_prefix = '_pypy_math_'
 else:
@@ -57,7 +56,6 @@
 math_fmod  = llexternal('fmod',  [rffi.DOUBLE, rffi.DOUBLE], rffi.DOUBLE)
 math_hypot = llexternal(underscore + 'hypot',
                         [rffi.DOUBLE, rffi.DOUBLE], rffi.DOUBLE)
-math_isinf = math_llexternal('isinf', [rffi.DOUBLE], rffi.INT)
 
 # ____________________________________________________________
 #
@@ -95,9 +93,8 @@
     # are awesome.
     return y != y
 
- at jit.purefunction
 def ll_math_isinf(y):
-    return bool(math_isinf(y))
+    return not isnan(y) and isnan(y - y)
 
 
 ll_math_copysign = math_copysign