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

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Multiplication is commutative.

instructions in affected programs:     48314 -> 47954 (-0.75%)

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Matt Turner 2014-10-26 10:08:40 -07:00
parent d056863b3c
commit b65bd9583b
1 changed files with 5 additions and 1 deletions
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6
src/mesa/drivers/dri/i965/brw_fs_cse.cpp
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@ -128,7 +128,11 @@ operands_match(fs_inst *a, fs_inst *b)
fs_reg *xs = a->src;
fs_reg *ys = b->src;
if (!is_expression_commutative(a->opcode)) {
if (a->opcode == 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(a->opcode)) {
bool match = true;
for (int i = 0; i < a->sources; i++) {
if (!xs[i].equals(ys[i])) {