Commit 2371b8fc authored by Christoph Mallon's avatar Christoph Mallon
Browse files

Implement

- -a * const   -> a * -const
- -a * -b      -> a * b
- -a * (b - c) -> a * (c - b)
- (a - b) * -c -> (b - a) * c

[r15778]
parent 70630892
......@@ -2316,6 +2316,47 @@ static ir_node *transform_node_Mul(ir_node *n) {
return n;
}
}
if (is_Minus(a)) {
if (is_Const(b)) { /* -a * const -> a * -const */
tarval *tv = tarval_neg(get_Const_tarval(b));
dbg_info *dbgi = get_irn_dbg_info(b);
ir_graph *irg = current_ir_graph;
ir_node *block = get_nodes_block(b);
ir_mode *mode = get_irn_mode(b);
ir_node *cnst = new_rd_Const(dbgi, irg, block, mode, tv);
set_Mul_left( n, get_Minus_op(a));
set_Mul_right(n, cnst);
return n;
} else if (is_Minus(b)) { /* -a * -b -> a * b */
set_Mul_left( n, get_Minus_op(a));
set_Mul_right(n, get_Minus_op(b));
return n;
} else if (is_Sub(b)) { /* -a * (b - c) -> a * (c - b) */
ir_node *sub_l = get_Sub_left(b);
ir_node *sub_r = get_Sub_right(b);
dbg_info *dbgi = get_irn_dbg_info(b);
ir_graph *irg = current_ir_graph;
ir_mode *mode = get_irn_mode(b);
ir_node *block = get_nodes_block(b);
ir_node *new_b = new_rd_Sub(dbgi, irg, block, sub_r, sub_l, mode);
set_Mul_left( n, get_Minus_op(a));
set_Mul_right(n, new_b);
return n;
}
} else if (is_Minus(b)) {
if (is_Sub(a)) { /* (a - b) * -c -> (b - a) * c */
ir_node *sub_l = get_Sub_left(a);
ir_node *sub_r = get_Sub_right(a);
dbg_info *dbgi = get_irn_dbg_info(a);
ir_graph *irg = current_ir_graph;
ir_mode *mode = get_irn_mode(a);
ir_node *block = get_nodes_block(a);
ir_node *new_a = new_rd_Sub(dbgi, irg, block, sub_r, sub_l, mode);
set_Mul_left (n, new_a);
set_Mul_right(n, get_Minus_op(b));
return n;
}
}
if (get_mode_arithmetic(mode) == irma_ieee754) {
if (is_Const(a)) {
tarval *tv = get_Const_tarval(a);
......@@ -3921,7 +3962,7 @@ static ir_node *transform_node_Mux(ir_node *n) {
ir_node *t = get_Mux_true(n);
/*
* Note: normalization puts the constant on the right site,
* Note: normalization puts the constant on the right side,
* so we check only one case.
*
* Note further that these optimization work even for floating point
......
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment