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glsl/lower_instructions: add double lowering passes

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This lowers double dot product and lrp to fma.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
This commit is contained in:
Dave Airlie
2014-08-14 18:44:35 +10:00
committed by Ilia Mirkin
parent 8be5ee23de
commit 2e626318e0
1 changed files with 65 additions and 0 deletions
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src/glsl/lower_instructions.cpp
+65
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@@ -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);