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

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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: Kristian Høgsberg <krh@bitplanet.net>
This commit is contained in:
Matt Turner 2014-12-19 21:30:16 -08:00
parent 0d05d1226e
commit c4fab711ed
1 changed files with 12 additions and 0 deletions
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12
src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
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@ -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;