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re PR tree-optimization/46728 (GCC does not generate fmadd for pow (x, 0.75)+y on powerpc)

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2011-05-25  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>

	PR tree-optimization/46728
	* tree-ssa-math-opts.c (gimple_expand_builtin_pow): New.
	(execute_cse_sincos): Add switch case for BUILT_IN_POW.

From-SVN: r174196
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Bill Schmidt 2011-05-25 13:35:53 +00:00 committed by William Schmidt
parent d9f8303fb6
commit d24ad7d6e9
2 changed files with 63 additions and 1 deletions
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12
gcc/ChangeLog
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@ -1,3 +1,9 @@
2011-05-25 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
PR tree-optimization/46728
* tree-ssa-math-opts.c (gimple_expand_builtin_pow): New.
(execute_cse_sincos): Add switch case for BUILT_IN_POW.
2011-05-25 Nathan Froyd <froydnj@codesourcery.com>
* tree.h (struct tree_exp): Inherit from struct tree_typed.
@ -150,6 +156,12 @@
2011-05-24 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
PR tree-optimization/46728
* tree-ssa-math-opts.c (gimple_expand_builtin_pow): New.
(execute_cse_sincos): Add switch case for BUILT_IN_POW.
2011-05-24 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
PR tree-optimization/46728
* tree-ssa-math-opts.c (powi_table): New.
(powi_lookup_cost): New.

52
gcc/tree-ssa-math-opts.c
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@ -1,5 +1,5 @@
/* Global, SSA-based optimizations using mathematical identities.
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
This file is part of GCC.
@ -1024,6 +1024,39 @@ gimple_expand_builtin_powi (gimple_stmt_iterator *gsi, location_t loc,
return NULL_TREE;
}
/* ARG0 and ARG1 are the two arguments to a pow builtin call in GSI
with location info LOC. If possible, create an equivalent and
less expensive sequence of statements prior to GSI, and return an
expession holding the result. */
static tree
gimple_expand_builtin_pow (gimple_stmt_iterator *gsi, location_t loc,
tree arg0, tree arg1)
{
REAL_VALUE_TYPE c, cint;
HOST_WIDE_INT n;
/* If the exponent isn't a constant, there's nothing of interest
to be done. */
if (TREE_CODE (arg1) != REAL_CST)
return NULL_TREE;
/* If the exponent is equivalent to an integer, expand it into
multiplies when profitable. */
c = TREE_REAL_CST (arg1);
n = real_to_integer (&c);
real_from_integer (&cint, VOIDmode, n, n < 0 ? -1 : 0, 0);
if (real_identical (&c, &cint)
&& ((n >= -1 && n <= 2)
|| (flag_unsafe_math_optimizations
&& optimize_insn_for_speed_p ()
&& powi_cost (n) <= POWI_MAX_MULTS)))
return gimple_expand_builtin_powi (gsi, loc, arg0, n);
return NULL_TREE;
}
/* Go through all calls to sin, cos and cexpi and call execute_cse_sincos_1
on the SSA_NAME argument of each of them. Also expand powi(x,n) into
an optimal number of multiplies, when n is a constant. */
@ -1065,6 +1098,23 @@ execute_cse_sincos (void)
cfg_changed |= execute_cse_sincos_1 (arg);
break;
CASE_FLT_FN (BUILT_IN_POW):
arg0 = gimple_call_arg (stmt, 0);
arg1 = gimple_call_arg (stmt, 1);
loc = gimple_location (stmt);
result = gimple_expand_builtin_pow (&gsi, loc, arg0, arg1);
if (result)
{
tree lhs = gimple_get_lhs (stmt);
gimple new_stmt = gimple_build_assign (lhs, result);
gimple_set_location (new_stmt, loc);
unlink_stmt_vdef (stmt);
gsi_replace (&gsi, new_stmt, true);
}
break;
CASE_FLT_FN (BUILT_IN_POWI):
arg0 = gimple_call_arg (stmt, 0);
arg1 = gimple_call_arg (stmt, 1);