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(simple_operand_p): Don't regard global or static variables as simple. 

(simple_operand_p): Don't regard global or static
	variables as simple.
	(fold_truthop): Only require the RHS to be simple.

From-SVN: r2473
This commit is contained in:
Tom Wood 1992-10-15 11:39:38 +00:00
parent d15d0264a9
commit 8227896cf6
1 changed files with 11 additions and 5 deletions
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16
gcc/fold-const.c
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@ -2424,7 +2424,15 @@ simple_operand_p (exp)
|| (TREE_CODE_CLASS (TREE_CODE (exp)) == 'd'
&& ! TREE_ADDRESSABLE (exp)
&& ! TREE_THIS_VOLATILE (exp)
&& ! DECL_NONLOCAL (exp)));
&& ! DECL_NONLOCAL (exp)
/* Don't regard global variables as simple. They may be
allocated in ways unknown to the compiler (shared memory,
#pragma weak, etc). */
&& ! TREE_PUBLIC (exp)
&& ! DECL_EXTERNAL (exp)
/* Loading a static variable is unduly expensive, but global
registers aren't expensive. */
&& (! TREE_STATIC (exp) || DECL_REGISTER (exp))));
}
/* Subroutine for fold_truthop: try to optimize a range test.
@ -2657,7 +2665,7 @@ fold_truthop (code, truth_type, lhs, rhs)
return result;
}
/* If the RHS can be evaluated unconditionally and all operands are
/* If the RHS can be evaluated unconditionally and its operands are
simple, it wins to evaluate the RHS unconditionally on machines
with expensive branches. In this case, this isn't a comparison
that can be merged. */
@ -2668,9 +2676,7 @@ fold_truthop (code, truth_type, lhs, rhs)
if (BRANCH_COST >= 2
&& TREE_CODE (TREE_TYPE (rhs)) == INTEGER_TYPE
&& simple_operand_p (rl_arg)
&& simple_operand_p (ll_arg)
&& simple_operand_p (rr_arg)
&& simple_operand_p (lr_arg))
&& simple_operand_p (rr_arg))
return build (code, truth_type, lhs, rhs);
/* See if the comparisons can be merged. Then get all the parameters for