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builtins.c (real_dconstp): Delete.

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* builtins.c (real_dconstp): Delete.
	(fold_builtin_logarithm): Remove inaccurate log(e) special case.

testsuite:
	* gcc.dg/torture/builtin-explog-1.c: Remove tests that aren't true
	for low precision (i.e. float).

From-SVN: r145130
This commit is contained in:
Kaveh R. Ghazi 2009-03-27 21:55:20 +00:00 committed by Kaveh Ghazi
parent 346a77d1d8
commit 7338ea632b
4 changed files with 10 additions and 28 deletions
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5
gcc/ChangeLog
View File

@ -1,3 +1,8 @@
2009-03-27 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
* builtins.c (real_dconstp): Delete.
(fold_builtin_logarithm): Remove inaccurate log(e) special case.
2009-03-27 Dodji Seketeli <dodji@redhat.com>
Jakub Jelinek <jakub@redhat.com>

26
gcc/builtins.c
View File

@ -8331,21 +8331,6 @@ fold_builtin_bswap (tree fndecl, tree arg)
return NULL_TREE;
}
/* Return true if EXPR is the real constant contained in VALUE. */
static bool
real_dconstp (tree expr, const REAL_VALUE_TYPE *value)
{
STRIP_NOPS (expr);
return ((TREE_CODE (expr) == REAL_CST
&& !TREE_OVERFLOW (expr)
&& REAL_VALUES_EQUAL (TREE_REAL_CST (expr), *value))
|| (TREE_CODE (expr) == COMPLEX_CST
&& real_dconstp (TREE_REALPART (expr), value)
&& real_zerop (TREE_IMAGPART (expr))));
}
/* A subroutine of fold_builtin to fold the various logarithmic
functions. Return NULL_TREE if no simplification can me made.
FUNC is the corresponding MPFR logarithm function. */
@ -8360,17 +8345,6 @@ fold_builtin_logarithm (tree fndecl, tree arg,
tree res;
const enum built_in_function fcode = builtin_mathfn_code (arg);
/* Optimize log(e) = 1.0. We're never passed an exact 'e',
instead we'll look for 'e' truncated to MODE. So only do
this if flag_unsafe_math_optimizations is set. */
if (flag_unsafe_math_optimizations && func == mpfr_log)
{
const REAL_VALUE_TYPE e_truncated =
real_value_truncate (TYPE_MODE (type), dconst_e ());
if (real_dconstp (arg, &e_truncated))
return build_real (type, dconst1);
}
/* Calculate the result when the argument is a constant. */
if ((res = do_mpfr_arg1 (arg, type, func, &dconst0, NULL, false)))
return res;

5
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2009-03-27 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
* gcc.dg/torture/builtin-explog-1.c: Remove tests that aren't true
for low precision (i.e. float).
2009-03-27 Dodji Seketeli <dodji@redhat.com>
Jakub Jelinek <jakub@redhat.com>

2
gcc/testsuite/gcc.dg/torture/builtin-explog-1.c
View File

@ -53,7 +53,6 @@ void test(double d1, double d2, float f1, float f2,
if (LOG(BASE) != 1.0 || LOG##f(BASE##F) != 1.0F || LOG##l(BASE##L) != 1.0L) \
link_failure_##LOG##_N()
LOG_N(log, M_E);
LOG_N(log2, 2.0);
LOG_N(log10, 10.0);
@ -74,7 +73,6 @@ void test(double d1, double d2, float f1, float f2,
if (LOG(EXP(d1)) != d1*LOG(BASE) || LOG##f(EXP##f(f1)) != f1*LOG##f(BASE##F) \
|| LOG##l(EXP##l(ld1)) != ld1*LOG##l(BASE##L)) link_failure_##LOG##_##EXP()
LOGEXP(log,exp,M_E);
LOGEXP(log,exp2,2.0);
LOGEXP(log,exp10,10.0);
LOGEXP(log,pow10,10.0);