[Mesa-dev] [PATCH 09/20] glsl/lower_instructions: add double lowering passes
Dave Airlie
airlied at gmail.com
Wed Sep 3 21:15:31 PDT 2014
This lowers double dot product and lrp to fma.
Signed-off-by: Dave Airlie <airlied at redhat.com>
---
src/glsl/lower_instructions.cpp | 83 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 83 insertions(+)
diff --git a/src/glsl/lower_instructions.cpp b/src/glsl/lower_instructions.cpp
index 03df07f..556b607 100644
--- a/src/glsl/lower_instructions.cpp
+++ b/src/glsl/lower_instructions.cpp
@@ -112,6 +112,7 @@
*/
#include "main/core.h" /* for M_LOG2E */
+#include "program/prog_instruction.h" /* for swizzle */
#include "glsl_types.h"
#include "ir.h"
#include "ir_builder.h"
@@ -145,6 +146,8 @@ private:
void carry_to_arith(ir_expression *);
void borrow_to_arith(ir_expression *);
void sat_to_clamp(ir_expression *);
+ void double_dot_to_fma(ir_expression *);
+ void double_lrp(ir_expression *);
};
} /* anonymous namespace */
@@ -508,10 +511,90 @@ lower_instructions_visitor::sat_to_clamp(ir_expression *ir)
this->progress = true;
}
+void
+lower_instructions_visitor::double_dot_to_fma(ir_expression *ir)
+{
+ ir_variable *temp = new(ir) ir_variable(ir->operands[0]->type->get_base_type(), "dot_res",
+ ir_var_temporary);
+ this->base_ir->insert_before(temp);
+
+ int nc = ir->operands[0]->type->components();
+ for (int i = nc - 1; i >= 1; i--) {
+ ir_assignment *assig;
+ if (i == (nc - 1)) {
+ assig = assign(temp, mul(swizzle(ir->operands[0]->clone(ir, NULL), i, 1),
+ swizzle(ir->operands[1]->clone(ir, NULL), i, 1)));
+ } else {
+ assig = assign(temp, fma(swizzle(ir->operands[0]->clone(ir, NULL), i, 1),
+ swizzle(ir->operands[1]->clone(ir, NULL), i, 1),
+ temp));
+ }
+ this->base_ir->insert_before(assig);
+ }
+
+ ir->operation = ir_triop_fma;
+ ir->operands[0] = swizzle(ir->operands[0], 0, 1);
+ ir->operands[1] = swizzle(ir->operands[1], 0, 1);
+ ir->operands[2] = new(ir) ir_dereference_variable(temp);
+
+ this->progress = true;
+
+}
+
+void
+lower_instructions_visitor::double_lrp(ir_expression *ir)
+{
+ ir_assignment *assig;
+ ir_constant *one = new(ir) ir_constant(1.0, ir->operands[2]->type->vector_elements);
+ ir_variable *temp = new(ir) ir_variable(ir->operands[0]->type, "lrp_res",
+ ir_var_temporary);
+ ir_variable *t2 = new(ir) ir_variable(ir->operands[0]->type, "aval",
+ ir_var_temporary);
+ int swizval;
+ this->base_ir->insert_before(temp);
+ this->base_ir->insert_before(t2);
+
+ assig = assign(temp, mul(sub(one, ir->operands[2]), ir->operands[0]));
+ this->base_ir->insert_before(assig);
+
+ switch (ir->operands[2]->type->vector_elements) {
+ case 1:
+ swizval = SWIZZLE_XXXX;
+ break;
+ case 2:
+ swizval = MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_X, SWIZZLE_X);
+ break;
+ case 3:
+ swizval = MAKE_SWIZZLE4(SWIZZLE_X, SWIZZLE_Y, SWIZZLE_Z, SWIZZLE_X);
+ break;
+ case 4:
+ default:
+ swizval = SWIZZLE_XYZW;
+ break;
+ }
+ assig = assign(t2, swizzle(ir->operands[2], swizval, ir->operands[0]->type->vector_elements));
+ this->base_ir->insert_before(assig);
+
+ ir->operation = ir_triop_fma;
+ ir->operands[0] = new(ir) ir_dereference_variable(t2);
+ ir->operands[1] = ir->operands[1];
+ ir->operands[2] = new(ir) ir_dereference_variable(temp);
+
+ this->progress = true;
+}
+
ir_visitor_status
lower_instructions_visitor::visit_leave(ir_expression *ir)
{
switch (ir->operation) {
+ case ir_binop_dot:
+ if (ir->operands[0]->type->is_double())
+ double_dot_to_fma(ir);
+ break;
+ case ir_triop_lrp:
+ if (ir->operands[0]->type->is_double())
+ double_lrp(ir);
+ break;
case ir_binop_sub:
if (lowering(SUB_TO_ADD_NEG))
sub_to_add_neg(ir);
--
2.1.0
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