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Reassociate multiply expression with an adjacent non-multiply expression.

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Reviewed by Roger Sayle.

From-SVN: r80093
This commit is contained in:
Fariborz Jahanian 2004-03-30 20:00:23 +00:00 committed by Fariborz Jahanian
parent cfdfa11075
commit 0af5da7fb0
2 changed files with 36 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2004-03-29 Fariborz Jahanian <fjahanian@apple.com>
* fold-const.c (fold): Reassociate multiply expression
with an adjacent non-multiply expression to use
architecture's multiply-add instruction.
2004-03-30 Zack Weinberg <zack@codesourcery.com>
* gengtype.c (create_option): New function.

30
gcc/fold-const.c
View File

@ -6042,6 +6042,36 @@ fold (tree expr)
TREE_OPERAND (arg0, 0),
build_real (type, c1)));
}
/* Convert a + (b*c + d*e) into (a + b*c) + d*e */
if (flag_unsafe_math_optimizations
&& TREE_CODE (arg1) == PLUS_EXPR
&& TREE_CODE (arg0) != MULT_EXPR)
{
tree tree10 = TREE_OPERAND (arg1, 0);
tree tree11 = TREE_OPERAND (arg1, 1);
if (TREE_CODE (tree11) == MULT_EXPR
&& TREE_CODE (tree10) == MULT_EXPR)
{
tree tree0;
tree0 = fold (build (PLUS_EXPR, type, arg0, tree10));
return fold (build (PLUS_EXPR, type, tree0, tree11));
}
}
/* Convert (b*c + d*e) + a into b*c + (d*e +a) */
if (flag_unsafe_math_optimizations
&& TREE_CODE (arg0) == PLUS_EXPR
&& TREE_CODE (arg1) != MULT_EXPR)
{
tree tree00 = TREE_OPERAND (arg0, 0);
tree tree01 = TREE_OPERAND (arg0, 1);
if (TREE_CODE (tree01) == MULT_EXPR
&& TREE_CODE (tree00) == MULT_EXPR)
{
tree tree0;
tree0 = fold (build (PLUS_EXPR, type, tree01, arg1));
return fold (build (PLUS_EXPR, type, tree00, tree0));
}
}
}
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