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-rw-r--r--src/glsl/lower_instructions.cpp175
1 files changed, 175 insertions, 0 deletions
diff --git a/src/glsl/lower_instructions.cpp b/src/glsl/lower_instructions.cpp
index 8994aadf34f..c63c018e247 100644
--- a/src/glsl/lower_instructions.cpp
+++ b/src/glsl/lower_instructions.cpp
@@ -42,6 +42,7 @@
* - CARRY_TO_ARITH
* - BORROW_TO_ARITH
* - SAT_TO_CLAMP
+ * - DOPS_TO_DFRAC
*
* SUB_TO_ADD_NEG:
* ---------------
@@ -112,6 +113,9 @@
* -------------
* Converts ir_unop_saturate into min(max(x, 0.0), 1.0)
*
+ * DOPS_TO_DFRAC:
+ * --------------
+ * Converts double trunc, ceil, floor, round to fract
*/
#include "main/core.h" /* for M_LOG2E */
@@ -151,6 +155,11 @@ private:
void sat_to_clamp(ir_expression *);
void double_dot_to_fma(ir_expression *);
void double_lrp(ir_expression *);
+ void dceil_to_dfrac(ir_expression *);
+ void dfloor_to_dfrac(ir_expression *);
+ void dround_even_to_dfrac(ir_expression *);
+ void dtrunc_to_dfrac(ir_expression *);
+ void dsign_to_csel(ir_expression *);
};
} /* anonymous namespace */
@@ -315,6 +324,9 @@ lower_instructions_visitor::mod_to_floor(ir_expression *ir)
ir_expression *const floor_expr =
new(ir) ir_expression(ir_unop_floor, x->type, div_expr);
+ if (lowering(DOPS_TO_DFRAC) && ir->type->is_double())
+ dfloor_to_dfrac(floor_expr);
+
ir_expression *const mul_expr =
new(ir) ir_expression(ir_binop_mul,
new(ir) ir_dereference_variable(y),
@@ -578,6 +590,145 @@ lower_instructions_visitor::double_lrp(ir_expression *ir)
this->progress = true;
}
+void
+lower_instructions_visitor::dceil_to_dfrac(ir_expression *ir)
+{
+ /*
+ * frtemp = frac(x);
+ * temp = sub(x, frtemp);
+ * result = temp + ((frtemp != 0.0) ? 1.0 : 0.0);
+ */
+ ir_instruction &i = *base_ir;
+ ir_constant *zero = new(ir) ir_constant(0.0, ir->operands[0]->type->vector_elements);
+ ir_constant *one = new(ir) ir_constant(1.0, ir->operands[0]->type->vector_elements);
+ ir_variable *frtemp = new(ir) ir_variable(ir->operands[0]->type, "frtemp",
+ ir_var_temporary);
+
+ i.insert_before(frtemp);
+ i.insert_before(assign(frtemp, fract(ir->operands[0])));
+
+ ir->operation = ir_binop_add;
+ ir->operands[0] = sub(ir->operands[0]->clone(ir, NULL), frtemp);
+ ir->operands[1] = csel(nequal(frtemp, zero), one, zero->clone(ir, NULL));
+
+ this->progress = true;
+}
+
+void
+lower_instructions_visitor::dfloor_to_dfrac(ir_expression *ir)
+{
+ /*
+ * frtemp = frac(x);
+ * result = sub(x, frtemp);
+ */
+ ir->operation = ir_binop_sub;
+ ir->operands[1] = fract(ir->operands[0]->clone(ir, NULL));
+
+ this->progress = true;
+}
+void
+lower_instructions_visitor::dround_even_to_dfrac(ir_expression *ir)
+{
+ /*
+ * insane but works
+ * temp = x + 0.5;
+ * frtemp = frac(temp);
+ * t2 = sub(temp, frtemp);
+ * if (frac(x) == 0.5)
+ * result = frac(t2 * 0.5) == 0 ? t2 : t2 - 1;
+ * else
+ * result = t2;
+
+ */
+ ir_instruction &i = *base_ir;
+ ir_variable *frtemp = new(ir) ir_variable(ir->operands[0]->type, "frtemp",
+ ir_var_temporary);
+ ir_variable *temp = new(ir) ir_variable(ir->operands[0]->type, "temp",
+ ir_var_temporary);
+ ir_variable *t2 = new(ir) ir_variable(ir->operands[0]->type, "t2",
+ ir_var_temporary);
+ ir_constant *p5 = new(ir) ir_constant(0.5, ir->operands[0]->type->vector_elements);
+ ir_constant *one = new(ir) ir_constant(1.0, ir->operands[0]->type->vector_elements);
+ ir_constant *zero = new(ir) ir_constant(0.0, ir->operands[0]->type->vector_elements);
+
+ i.insert_before(temp);
+ i.insert_before(assign(temp, add(ir->operands[0], p5)));
+
+ i.insert_before(frtemp);
+ i.insert_before(assign(frtemp, fract(temp)));
+
+ i.insert_before(t2);
+ i.insert_before(assign(t2, sub(temp, frtemp)));
+
+ ir->operation = ir_triop_csel;
+ ir->operands[0] = equal(fract(ir->operands[0]->clone(ir, NULL)),
+ p5->clone(ir, NULL));
+ ir->operands[1] = csel(equal(fract(mul(t2, p5->clone(ir, NULL))),
+ zero),
+ t2,
+ sub(t2, one));
+ ir->operands[2] = new(ir) ir_dereference_variable(t2);
+
+ this->progress = true;
+}
+
+void
+lower_instructions_visitor::dtrunc_to_dfrac(ir_expression *ir)
+{
+ /*
+ * frtemp = frac(x);
+ * temp = sub(x, frtemp);
+ * result = x >= 0 ? temp : temp + (frtemp == 0.0) ? 0 : 1;
+ */
+ ir_rvalue *arg = ir->operands[0];
+ ir_instruction &i = *base_ir;
+
+ ir_constant *zero = new(ir) ir_constant(0.0, arg->type->vector_elements);
+ ir_constant *one = new(ir) ir_constant(1.0, arg->type->vector_elements);
+ ir_variable *frtemp = new(ir) ir_variable(arg->type, "frtemp",
+ ir_var_temporary);
+ ir_variable *temp = new(ir) ir_variable(ir->operands[0]->type, "temp",
+ ir_var_temporary);
+
+ i.insert_before(frtemp);
+ i.insert_before(assign(frtemp, fract(arg)));
+ i.insert_before(temp);
+ i.insert_before(assign(temp, sub(arg->clone(ir, NULL), frtemp)));
+
+ ir->operation = ir_triop_csel;
+ ir->operands[0] = gequal(arg->clone(ir, NULL), zero);
+ ir->operands[1] = new (ir) ir_dereference_variable(temp);
+ ir->operands[2] = add(temp,
+ csel(equal(frtemp, zero->clone(ir, NULL)),
+ zero->clone(ir, NULL),
+ one));
+
+ this->progress = true;
+}
+
+void
+lower_instructions_visitor::dsign_to_csel(ir_expression *ir)
+{
+ /*
+ * temp = x > 0.0 ? 1.0 : 0.0;
+ * result = x < 0.0 ? -1.0 : temp;
+ */
+ ir_rvalue *arg = ir->operands[0];
+ ir_constant *zero = new(ir) ir_constant(0.0, arg->type->vector_elements);
+ ir_constant *one = new(ir) ir_constant(1.0, arg->type->vector_elements);
+ ir_constant *neg_one = new(ir) ir_constant(-1.0, arg->type->vector_elements);
+
+ ir->operation = ir_triop_csel;
+ ir->operands[0] = less(arg->clone(ir, NULL),
+ zero->clone(ir, NULL));
+ ir->operands[1] = neg_one;
+ ir->operands[2] = csel(greater(arg, zero),
+ one,
+ zero->clone(ir, NULL));
+
+ this->progress = true;
+}
+
ir_visitor_status
lower_instructions_visitor::visit_leave(ir_expression *ir)
{
@@ -647,6 +798,30 @@ lower_instructions_visitor::visit_leave(ir_expression *ir)
sat_to_clamp(ir);
break;
+ case ir_unop_trunc:
+ if (lowering(DOPS_TO_DFRAC) && ir->type->is_double())
+ dtrunc_to_dfrac(ir);
+ break;
+
+ case ir_unop_ceil:
+ if (lowering(DOPS_TO_DFRAC) && ir->type->is_double())
+ dceil_to_dfrac(ir);
+ break;
+
+ case ir_unop_floor:
+ if (lowering(DOPS_TO_DFRAC) && ir->type->is_double())
+ dfloor_to_dfrac(ir);
+ break;
+
+ case ir_unop_round_even:
+ if (lowering(DOPS_TO_DFRAC) && ir->type->is_double())
+ dround_even_to_dfrac(ir);
+ break;
+
+ case ir_unop_sign:
+ if (lowering(DOPS_TO_DFRAC) && ir->type->is_double())
+ dsign_to_csel(ir);
+ break;
default:
return visit_continue;
}
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