Improves GLB2.7 performance on my HSW by 0.671455% +/- 0.225037% (n=62).
---
src/mesa/drivers/dri/i965/brw_fs_visitor.cpp | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index f1539d5..8aae516 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -198,10 +198,19 @@ fs_visitor::visit(ir_dereference_array *ir)
this->result = src;
}
+static bool
+is_valid_3src(fs_reg reg)
+{
+ return reg.file == GRF || reg.file == UNIFORM;
+}
+
void
fs_visitor::emit_lrp(fs_reg dst, fs_reg x, fs_reg y, fs_reg a)
{
- if (intel->gen < 6 || x.file != GRF || y.file != GRF || a.file != GRF) {
+ if (intel->gen < 6 ||
+ !is_valid_3src(x) ||
+ !is_valid_3src(y) ||
+ !is_valid_3src(a)) {
/* We can't use the LRP instruction. Emit x*(1-a) + y*a. */
fs_reg y_times_a = fs_reg(this, glsl_type::float_type);
fs_reg one_minus_a = fs_reg(this, glsl_type::float_type);
--
1.7.10.4
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