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(fold): Handle EQ_EXPR and NE_EXPR where both args are comparisons or

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BIT_AND_EXPR with constant 1.

From-SVN: r5186
This commit is contained in:
Richard Kenner 1993-08-19 08:28:38 -04:00
parent 0dc92bf6bc
commit 2df46b06a2
1 changed files with 15 additions and 4 deletions
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19
gcc/fold-const.c
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@ -3167,9 +3167,11 @@ fold (expr)
one of the operands is a comparison and the other is either a comparison
or a BIT_AND_EXPR with the constant 1. In that case, the code below
would make the expression more complex. Change it to a
TRUTH_{AND,OR}_EXPR. */
TRUTH_{AND,OR}_EXPR. Likewise, convert a similar NE_EXPR to
TRUTH_XOR_EXPR and an EQ_EXPR to the inversion of a TRUTH_XOR_EXPR. */
if ((code == BIT_AND_EXPR || code == BIT_IOR_EXPR)
if ((code == BIT_AND_EXPR || code == BIT_IOR_EXPR
|| code == EQ_EXPR || code == NE_EXPR)
&& ((TREE_CODE_CLASS (TREE_CODE (arg0)) == '<'
&& (TREE_CODE_CLASS (TREE_CODE (arg1)) == '<'
|| (TREE_CODE (arg1) == BIT_AND_EXPR
@ -3178,8 +3180,17 @@ fold (expr)
&& (TREE_CODE_CLASS (TREE_CODE (arg0)) == '<'
|| (TREE_CODE (arg0) == BIT_AND_EXPR
&& integer_onep (TREE_OPERAND (arg0, 1)))))))
return fold (build (code == BIT_AND_EXPR ? TRUTH_AND_EXPR : TRUTH_OR_EXPR,
type, arg0, arg1));
{
t = fold (build (code == BIT_AND_EXPR ? TRUTH_AND_EXPR
: code == BIT_IOR_EXPR ? TRUTH_OR_EXPR
: TRUTH_XOR_EXPR,
type, arg0, arg1));
if (code == EQ_EXPR)
t = invert_truthvalue (t);
return t;
}
if (TREE_CODE_CLASS (code) == '1')
{