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Emit vscale_range() fn attribute in correct syntax #8457

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merged 1 commit into from
Nov 6, 2024
Merged

Emit vscale_range() fn attribute in correct syntax #8457

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24 changes: 17 additions & 7 deletions src/CodeGen_Internal.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -560,7 +560,7 @@ Expr lower_round_to_nearest_ties_to_even(const Expr &x) {
}

namespace {
bool get_md_bool(llvm::Metadata *value, bool &result) {
bool get_md_int(llvm::Metadata *value, int64_t &result) {
if (!value) {
return false;
}
Expand All @@ -572,10 +572,16 @@ bool get_md_bool(llvm::Metadata *value, bool &result) {
if (!c) {
return false;
}
result = !c->isZero();
result = c->getSExtValue();
return true;
}

bool get_md_bool(llvm::Metadata *value, bool &result) {
int64_t r;
if (!get_md_int(value, r)) {
return false;
}
return r != 0;
}
bool get_md_string(llvm::Metadata *value, std::string &result) {
if (!value) {
result = "";
Expand Down Expand Up @@ -698,11 +704,14 @@ std::unique_ptr<llvm::TargetMachine> make_target_machine(const llvm::Module &mod
void set_function_attributes_from_halide_target_options(llvm::Function &fn) {
llvm::Module &module = *fn.getParent();

std::string mcpu_target, mcpu_tune, mattrs, vscale_range;
std::string mcpu_target, mcpu_tune, mattrs;
get_md_string(module.getModuleFlag("halide_mcpu_target"), mcpu_target);
get_md_string(module.getModuleFlag("halide_mcpu_tune"), mcpu_tune);
get_md_string(module.getModuleFlag("halide_mattrs"), mattrs);
get_md_string(module.getModuleFlag("halide_vscale_range"), vscale_range);
int64_t vscale_range;
if (!get_md_int(module.getModuleFlag("halide_effective_vscale"), vscale_range)) {
vscale_range = 0;
}

fn.addFnAttr("target-cpu", mcpu_target);
fn.addFnAttr("tune-cpu", mcpu_tune);
Expand All @@ -723,8 +732,9 @@ void set_function_attributes_from_halide_target_options(llvm::Function &fn) {
fn.addFnAttr("reciprocal-estimates", "none");

// If a fixed vscale is asserted, add it as an attribute on the function.
if (!vscale_range.empty()) {
fn.addFnAttr("vscale_range", vscale_range);
if (vscale_range != 0) {
fn.addFnAttr(llvm::Attribute::getWithVScaleRangeArgs(
module.getContext(), vscale_range, vscale_range));
}
}

Expand Down
3 changes: 1 addition & 2 deletions src/CodeGen_LLVM.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -420,8 +420,7 @@ void CodeGen_LLVM::init_codegen(const std::string &name, bool any_strict_float)
module->addModuleFlag(llvm::Module::Warning, "halide_use_large_code_model", llvm_large_code_model ? 1 : 0);
module->addModuleFlag(llvm::Module::Warning, "halide_per_instruction_fast_math_flags", any_strict_float);
if (effective_vscale != 0) {
module->addModuleFlag(llvm::Module::Warning, "halide_vscale_range",
MDString::get(*context, std::to_string(effective_vscale) + ", " + std::to_string(effective_vscale)));
module->addModuleFlag(llvm::Module::Warning, "halide_effective_vscale", effective_vscale);
}

// Ensure some types we need are defined
Expand Down
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