Commit c4fab711 authored by Matt Turner's avatar Matt Turner
Browse files

i965/fs: Emit MADs from (x + -(y * z)).



Just use the negation source modifier on one of the multiplicand
arguments.

total instructions in shared programs: 5889529 -> 5880016 (-0.16%)
instructions in affected programs:     600846 -> 591333 (-1.58%)
Reviewed-by: default avatarKristian Høgsberg <krh@bitplanet.net>
parent 0d05d122
......@@ -431,10 +431,21 @@ fs_visitor::try_emit_mad(ir_expression *ir)
ir_rvalue *nonmul = ir->operands[1];
ir_expression *mul = ir->operands[0]->as_expression();
bool mul_negate = false;
if (mul && mul->operation == ir_unop_neg) {
mul = mul->operands[0]->as_expression();
mul_negate = true;
}
if (!mul || mul->operation != ir_binop_mul) {
nonmul = ir->operands[0];
mul = ir->operands[1]->as_expression();
if (mul && mul->operation == ir_unop_neg) {
mul = mul->operands[0]->as_expression();
mul_negate = true;
}
if (!mul || mul->operation != ir_binop_mul)
return false;
}
......@@ -449,6 +460,7 @@ fs_visitor::try_emit_mad(ir_expression *ir)
mul->operands[0]->accept(this);
fs_reg src1 = this->result;
src1.negate ^= mul_negate;
mul->operands[1]->accept(this);
fs_reg src2 = this->result;
......
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