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authorDave Airlie <[email protected]>2014-08-14 18:44:35 +1000
committerIlia Mirkin <[email protected]>2015-02-19 00:28:35 -0500
commit2e626318e0c3ac08b8f9a6ef53325e05177b131b (patch)
tree3e88d2fa89d3b6b82d562e649e95caa305d47392 /src
parent8be5ee23de774a1101b808ff081cc3316d358933 (diff)
glsl/lower_instructions: add double lowering passes
This lowers double dot product and lrp to fma. Signed-off-by: Dave Airlie <[email protected]> Reviewed-by: Ilia Mirkin <[email protected]>
Diffstat (limited to 'src')
-rw-r--r--src/glsl/lower_instructions.cpp65
1 files changed, 65 insertions, 0 deletions
diff --git a/src/glsl/lower_instructions.cpp b/src/glsl/lower_instructions.cpp
index 5c1d6aae8fb..8994aadf34f 100644
--- a/src/glsl/lower_instructions.cpp
+++ b/src/glsl/lower_instructions.cpp
@@ -115,6 +115,7 @@
*/
#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"
@@ -148,6 +149,8 @@ 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 */
@@ -521,10 +524,72 @@ 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)
+{
+ int swizval;
+ ir_rvalue *op0 = ir->operands[0], *op2 = ir->operands[2];
+ ir_constant *one = new(ir) ir_constant(1.0, op2->type->vector_elements);
+
+ switch (op2->type->vector_elements) {
+ case 1:
+ swizval = SWIZZLE_XXXX;
+ break;
+ default:
+ assert(op0->type->vector_elements == op2->type->vector_elements);
+ swizval = SWIZZLE_XYZW;
+ break;
+ }
+
+ ir->operation = ir_triop_fma;
+ ir->operands[0] = swizzle(op2, swizval, op0->type->vector_elements);
+ ir->operands[2] = mul(sub(one, op2->clone(ir, NULL)), op0);
+
+ 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);