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#include "Halide.h"
using namespace Halide;
using namespace Halide::Internal;
namespace {
// Remove any "$[0-9]+" patterns in the string.
std::string strip_uniquified_names(const std::string &str) {
size_t pos = 0;
std::string result = str;
while ((pos = result.find("$", pos)) != std::string::npos) {
int digits = 0;
while (pos + digits + 1 < result.size() && isdigit(result[pos + digits + 1])) {
digits++;
}
if (digits > 0) {
result.replace(pos, 1 + digits, "");
}
pos += 1;
}
return result;
}
class CheckLoopLevels : public IRVisitor {
public:
static void lower_and_check(Func outer, const std::string &inner_loop_level, const std::string &outer_loop_level) {
Module m = outer.compile_to_module({outer.infer_arguments()});
CheckLoopLevels c(inner_loop_level, outer_loop_level);
m.functions().front().body.accept(&c);
}
private:
CheckLoopLevels(const std::string &inner_loop_level, const std::string &outer_loop_level)
: inner_loop_level(inner_loop_level), outer_loop_level(outer_loop_level) {
}
using IRVisitor::visit;
const std::string inner_loop_level, outer_loop_level;
std::string inside_for_loop;
void visit(const For *op) override {
std::string old_for_loop = inside_for_loop;
inside_for_loop = strip_uniquified_names(op->name);
IRVisitor::visit(op);
inside_for_loop = old_for_loop;
}
void visit(const Call *op) override {
IRVisitor::visit(op);
if (op->name == "sin_f32") {
_halide_user_assert(starts_with(inside_for_loop, inner_loop_level))
<< "call sin_f32: expected " << inner_loop_level << ", actual: " << inside_for_loop;
} else if (op->name == "cos_f32") {
_halide_user_assert(starts_with(inside_for_loop, outer_loop_level))
<< "call cos_f32: expected " << outer_loop_level << ", actual: " << inside_for_loop;
}
}
void visit(const Store *op) override {
IRVisitor::visit(op);
std::string op_name = strip_uniquified_names(op->name);
if (op_name == "inner") {
_halide_user_assert(starts_with(inside_for_loop, inner_loop_level))
<< "inside_for_loop: expected " << inner_loop_level << ", actual: " << inside_for_loop;
} else if (op_name == "outer") {
_halide_user_assert(starts_with(inside_for_loop, outer_loop_level))
<< "inside_for_loop: expected " << outer_loop_level << ", actual: " << inside_for_loop;
} else {
_halide_user_assert(0) << "store at: " << op_name << " inside_for_loop: " << inside_for_loop;
}
}
};
Var x{"x"};
class Example : public Generator<Example> {
public:
GeneratorParam<LoopLevel> inner_compute_at{"inner_compute_at", LoopLevel::inlined()};
Output<Func> inner{"inner", Int(32), 1};
void generate() {
// Use sin() as a proxy for verifying compute_at, since it won't
// ever be generated incidentally by the lowering code as part of
// general code structure.
inner(x) = cast(inner.type(), trunc(sin(x) * 1000.0f));
}
void schedule() {
inner.compute_at(inner_compute_at);
}
};
} // namespace
int main(int argc, char **argv) {
GeneratorContext context(get_jit_target_from_environment());
{
// Call GeneratorParam<LoopLevel>::set() with 'root' *before* generate(), then never modify again.
auto gen = context.create<Example>();
gen->inner_compute_at.set(LoopLevel::root());
gen->apply();
Func outer("outer");
outer(x) = gen->inner(x) + trunc(cos(x) * 1000.0f);
CheckLoopLevels::lower_and_check(outer,
/* inner loop level */ "inner.s0.x",
/* outer loop level */ "outer.s0.x");
}
{
// Call GeneratorParam<LoopLevel>::set() *before* generate() with undefined Looplevel;
// then modify that LoopLevel after generate() but before lowering
LoopLevel inner_compute_at; // undefined: must set before lowering
auto gen = context.create<Example>();
gen->inner_compute_at.set(inner_compute_at);
gen->apply();
Func outer("outer");
outer(x) = gen->inner(x) + trunc(cos(x) * 1000.0f);
inner_compute_at.set({outer, x});
CheckLoopLevels::lower_and_check(outer,
/* inner loop level */ "outer.s0.x",
/* outer loop level */ "outer.s0.x");
}
{
// Call GeneratorParam<LoopLevel>::set() *after* generate()
auto gen = context.create<Example>();
gen->apply();
Func outer("outer");
outer(x) = gen->inner(x) + trunc(cos(x) * 1000.0f);
gen->inner_compute_at.set({outer, x});
CheckLoopLevels::lower_and_check(outer,
/* inner loop level */ "outer.s0.x",
/* outer loop level */ "outer.s0.x");
}
{
// And now, a case that doesn't work:
// - Call GeneratorParam<LoopLevel>::set() *after* generate()
// - Then call set(), again, on the local LoopLevel passed previously
// As expected, the second set() will have no effect.
auto gen = context.create<Example>();
gen->apply();
Func outer("outer");
outer(x) = gen->inner(x) + trunc(cos(x) * 1000.0f);
LoopLevel inner_compute_at(LoopLevel::root());
gen->inner_compute_at.set(inner_compute_at);
// This has no effect. (If it did, the inner loop level below would be outer.s0.x)
inner_compute_at.set({outer, x});
CheckLoopLevels::lower_and_check(outer,
/* inner loop level */ "inner.s0.x",
/* outer loop level */ "outer.s0.x");
}
printf("Success!\n");
return 0;
}
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