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i965/vec4: Perform CSE on MAD instructions with final arguments switched.

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Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Matt Turner
2014-10-26 10:31:21 -07:00
parent b65bd9583b
commit 601a134180
1 changed files with 5 additions and 1 deletions
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src/mesa/drivers/dri/i965/brw_vec4_cse.cpp
+5 -1
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@@ -104,7 +104,11 @@ is_expression_commutative(enum opcode op)
static bool
operands_match(enum opcode op, src_reg *xs, src_reg *ys)
{
if (!is_expression_commutative(op)) {
if (op == BRW_OPCODE_MAD) {
return xs[0].equals(ys[0]) &&
((xs[1].equals(ys[1]) && xs[2].equals(ys[2])) ||
(xs[2].equals(ys[1]) && xs[1].equals(ys[2])));
} else if (!is_expression_commutative(op)) {
return xs[0].equals(ys[0]) && xs[1].equals(ys[1]) && xs[2].equals(ys[2]);
} else {
return (xs[0].equals(ys[0]) && xs[1].equals(ys[1])) ||