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

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(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_CODE_CLASS (TREE_CODE (exp)) == 'd'
&& ! TREE_ADDRESSABLE (exp) && ! TREE_ADDRESSABLE (exp)
&& ! TREE_THIS_VOLATILE (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. /* Subroutine for fold_truthop: try to optimize a range test.
@ -2657,7 +2665,7 @@ fold_truthop (code, truth_type, lhs, rhs)
return result; 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 simple, it wins to evaluate the RHS unconditionally on machines
with expensive branches. In this case, this isn't a comparison with expensive branches. In this case, this isn't a comparison
that can be merged. */ that can be merged. */
@ -2668,9 +2676,7 @@ fold_truthop (code, truth_type, lhs, rhs)
if (BRANCH_COST >= 2 if (BRANCH_COST >= 2
&& TREE_CODE (TREE_TYPE (rhs)) == INTEGER_TYPE && TREE_CODE (TREE_TYPE (rhs)) == INTEGER_TYPE
&& simple_operand_p (rl_arg) && simple_operand_p (rl_arg)
&& simple_operand_p (ll_arg) && simple_operand_p (rr_arg))
&& simple_operand_p (rr_arg)
&& simple_operand_p (lr_arg))
return build (code, truth_type, lhs, rhs); return build (code, truth_type, lhs, rhs);
/* See if the comparisons can be merged. Then get all the parameters for /* See if the comparisons can be merged. Then get all the parameters for