Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikk...@gmail.com>
---
src/mesa/drivers/dri/i965/brw_fs_visitor.cpp | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index d2dc5fa..22ca528 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -293,10 +293,6 @@ fs_visitor::try_emit_saturate(ir_expression *ir)
bool
fs_visitor::try_emit_mad(ir_expression *ir)
{
- /* 3-src instructions were introduced in gen6. */
- if (brw->gen < 6)
- return false;
-
/* MAD can only handle floating-point data. */
if (ir->type != glsl_type::float_type)
return false;
@@ -327,7 +323,16 @@ fs_visitor::try_emit_mad(ir_expression *ir)
fs_reg src2 = this->result;
this->result = fs_reg(this, ir->type);
- emit(BRW_OPCODE_MAD, this->result, src0, src1, src2);
+
+ /* 3-src instructions were introduced in gen6. */
+ if (brw->gen < 6) {
+ fs_reg temp = fs_reg(this, glsl_type::float_type);
+
+ emit(MUL(temp, src1, src2));
+ emit(ADD(this->result, src0, temp));
+ } else {
+ emit(BRW_OPCODE_MAD, this->result, src0, src1, src2);
+ }
return true;
}
--
1.8.1.2
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