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fold-const.c (fold): Use "fold" following build in more places. 

* fold-const.c (fold):  Use "fold" following build in more places.
	Optimize sqrt(x)*sqrt(x) as x, pow(x,y)*pow(z,y) as pow(x*z,y),
	pow(x,y)*pow(x,z) as pow(x,y+z) and x/pow(y,z) as x*pow(y,-z).

	* gcc.dg/builtins-11.c: New test case.

From-SVN: r65387
This commit is contained in:
Roger Sayle 2003-04-08 23:28:28 +00:00 committed by Roger Sayle
parent 531878a68e
commit 5fce2c6539
4 changed files with 126 additions and 12 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2003-04-08 Roger Sayle <roger@eyesopen.com>
* fold-const.c (fold): Use "fold" following build in more places.
Optimize sqrt(x)*sqrt(x) as x, pow(x,y)*pow(z,y) as pow(x*z,y),
pow(x,y)*pow(x,z) as pow(x,y+z) and x/pow(y,z) as x*pow(y,-z).
2003-04-08 Roger Sayle <roger@eyesopen.com>
* builtins.c (fold_builtin): Constant fold expressions as x*0.5

82
gcc/fold-const.c
View File

@ -5849,7 +5849,7 @@ fold (expr)
&& ! contains_placeholder_p (arg0))
{
tree arg = save_expr (arg0);
return build (PLUS_EXPR, type, arg, arg);
return fold (build (PLUS_EXPR, type, arg, arg));
}
if (flag_unsafe_math_optimizations)
@ -5857,17 +5857,25 @@ fold (expr)
enum built_in_function fcode0 = builtin_mathfn_code (arg0);
enum built_in_function fcode1 = builtin_mathfn_code (arg1);
/* Optimize sqrt(x)*sqrt(y) as sqrt(x*y). */
/* Optimizations of sqrt(...)*sqrt(...). */
if ((fcode0 == BUILT_IN_SQRT && fcode1 == BUILT_IN_SQRT)
|| (fcode0 == BUILT_IN_SQRTF && fcode1 == BUILT_IN_SQRTF)
|| (fcode0 == BUILT_IN_SQRTL && fcode1 == BUILT_IN_SQRTL))
{
tree sqrtfn = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0);
tree arg = build (MULT_EXPR, type,
TREE_VALUE (TREE_OPERAND (arg0, 1)),
TREE_VALUE (TREE_OPERAND (arg1, 1)));
tree arglist = build_tree_list (NULL_TREE, arg);
return fold (build_function_call_expr (sqrtfn, arglist));
tree sqrtfn, arg, arglist;
tree arg00 = TREE_VALUE (TREE_OPERAND (arg0, 1));
tree arg10 = TREE_VALUE (TREE_OPERAND (arg1, 1));
/* Optimize sqrt(x)*sqrt(x) as x. */
if (operand_equal_p (arg00, arg10, 0)
&& ! HONOR_SNANS (TYPE_MODE (type)))
return arg00;
/* Optimize sqrt(x)*sqrt(y) as sqrt(x*y). */
sqrtfn = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0);
arg = fold (build (MULT_EXPR, type, arg00, arg10));
arglist = build_tree_list (NULL_TREE, arg);
return build_function_call_expr (sqrtfn, arglist);
}
/* Optimize exp(x)*exp(y) as exp(x+y). */
@ -5879,8 +5887,43 @@ fold (expr)
tree arg = build (PLUS_EXPR, type,
TREE_VALUE (TREE_OPERAND (arg0, 1)),
TREE_VALUE (TREE_OPERAND (arg1, 1)));
tree arglist = build_tree_list (NULL_TREE, arg);
return fold (build_function_call_expr (expfn, arglist));
tree arglist = build_tree_list (NULL_TREE, fold (arg));
return build_function_call_expr (expfn, arglist);
}
/* Optimizations of pow(...)*pow(...). */
if ((fcode0 == BUILT_IN_POW && fcode1 == BUILT_IN_POW)
|| (fcode0 == BUILT_IN_POWF && fcode1 == BUILT_IN_POWF)
|| (fcode0 == BUILT_IN_POWL && fcode1 == BUILT_IN_POWL))
{
tree arg00 = TREE_VALUE (TREE_OPERAND (arg0, 1));
tree arg01 = TREE_VALUE (TREE_CHAIN (TREE_OPERAND (arg0,
1)));
tree arg10 = TREE_VALUE (TREE_OPERAND (arg1, 1));
tree arg11 = TREE_VALUE (TREE_CHAIN (TREE_OPERAND (arg1,
1)));
/* Optimize pow(x,y)*pow(z,y) as pow(x*z,y). */
if (operand_equal_p (arg01, arg11, 0))
{
tree powfn = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0);
tree arg = build (MULT_EXPR, type, arg00, arg10);
tree arglist = tree_cons (NULL_TREE, fold (arg),
build_tree_list (NULL_TREE,
arg01));
return build_function_call_expr (powfn, arglist);
}
/* Optimize pow(x,y)*pow(x,z) as pow(x,y+z). */
if (operand_equal_p (arg00, arg10, 0))
{
tree powfn = TREE_OPERAND (TREE_OPERAND (arg0, 0), 0);
tree arg = fold (build (PLUS_EXPR, type, arg01, arg11));
tree arglist = tree_cons (NULL_TREE, arg00,
build_tree_list (NULL_TREE,
arg));
return build_function_call_expr (powfn, arglist);
}
}
}
}
@ -6052,10 +6095,10 @@ fold (expr)
TREE_OPERAND (arg1, 1)));
}
/* Optimize x/exp(y) into x*exp(-y). */
if (flag_unsafe_math_optimizations)
{
enum built_in_function fcode = builtin_mathfn_code (arg1);
/* Optimize x/exp(y) into x*exp(-y). */
if (fcode == BUILT_IN_EXP
|| fcode == BUILT_IN_EXPF
|| fcode == BUILT_IN_EXPL)
@ -6063,10 +6106,25 @@ fold (expr)
tree expfn = TREE_OPERAND (TREE_OPERAND (arg1, 0), 0);
tree arg = build1 (NEGATE_EXPR, type,
TREE_VALUE (TREE_OPERAND (arg1, 1)));
tree arglist = build_tree_list (NULL_TREE, arg);
tree arglist = build_tree_list (NULL_TREE, fold (arg));
arg1 = build_function_call_expr (expfn, arglist);
return fold (build (MULT_EXPR, type, arg0, arg1));
}
/* Optimize x/pow(y,z) into x*pow(y,-z). */
if (fcode == BUILT_IN_POW
|| fcode == BUILT_IN_POWF
|| fcode == BUILT_IN_POWL)
{
tree powfn = TREE_OPERAND (TREE_OPERAND (arg1, 0), 0);
tree arg10 = TREE_VALUE (TREE_OPERAND (arg1, 1));
tree arg11 = TREE_VALUE (TREE_CHAIN (TREE_OPERAND (arg1, 1)));
tree neg11 = fold (build1 (NEGATE_EXPR, type, arg11));
tree arglist = tree_cons(NULL_TREE, arg10,
build_tree_list (NULL_TREE, neg11));
arg1 = build_function_call_expr (powfn, arglist);
return fold (build (MULT_EXPR, type, arg0, arg1));
}
}
goto binary;

4
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,7 @@
2003-04-08 Roger Sayle <roger@eyesopen.com>
* gcc.dg/builtins-11.c: New test case.
2003-04-08 Roger Sayle <roger@eyesopen.com>
* gcc.dg/builtins-9.c: New test case.

46
gcc/testsuite/gcc.dg/builtins-11.c Normal file
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@ -0,0 +1,46 @@
/* Copyright (C) 2003 Free Software Foundation.
Check that constant folding of built-in math functions doesn't
break anything and produces the expected results.
Written by Roger Sayle, 5th April 2003. */
/* { dg-do link } */
/* { dg-options "-O2 -ffast-math" } */
extern void link_error(void);
extern double exp(double);
extern double sqrt(double);
extern double pow(double,double);
void test(double x, double y, double z)
{
if (sqrt(x)*sqrt(x) != x)
link_error ();
if (sqrt(x)*sqrt(y) != sqrt(x*y))
link_error ();
if (exp(x)*exp(y) != exp(x+y))
link_error ();
if (pow(x,y)*pow(z,y) != pow(z*x,y))
link_error ();
if (pow(x,y)*pow(x,z) != pow(x,y+z))
link_error ();
if (x/exp(y) != x*exp(-y))
link_error ();
if (x/pow(y,z) != x*pow(y,-z))
link_error ();
}
int main()
{
test (2.0, 3.0, 4.0);
return 0;
}