Mesa (master): i965/fs: Emit MADs from (x + -(y * z)).
Matt Turner
mattst88 at kemper.freedesktop.org
Thu Jan 15 18:10:27 UTC 2015
Module: Mesa
Branch: master
Commit: c4fab711ed5bbdb6b8421a1b980215032fc795b8
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=c4fab711ed5bbdb6b8421a1b980215032fc795b8
Author: Matt Turner <mattst88 at gmail.com>
Date: Fri Dec 19 21:30:16 2014 -0800
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: Kristian Høgsberg <krh at bitplanet.net>
---
src/mesa/drivers/dri/i965/brw_fs_visitor.cpp | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index 6ddb267..7c062ec 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -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;
More information about the mesa-commit
mailing list