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//! NVidia PTX (Parallel Thread Execution)
//! https://docs.nvidia.com/cuda/parallel-thread-execution/index.html
//! For this we rely on the nvptx backend of LLVM
//! Kernel functions need to be marked both as "export" and "callconv(.Kernel)"
const NvPtx = @This();
const std = @import("std");
const builtin = @import("builtin");
const Allocator = std.mem.Allocator;
const assert = std.debug.assert;
const log = std.log.scoped(.link);
const Module = @import("../Module.zig");
const InternPool = @import("../InternPool.zig");
const Compilation = @import("../Compilation.zig");
const link = @import("../link.zig");
const trace = @import("../tracy.zig").trace;
const build_options = @import("build_options");
const Air = @import("../Air.zig");
const Liveness = @import("../Liveness.zig");
const LlvmObject = @import("../codegen/llvm.zig").Object;
base: link.File,
llvm_object: *LlvmObject,
ptx_file_name: []const u8,
pub fn createEmpty(gpa: Allocator, options: link.Options) !*NvPtx {
if (!options.use_llvm) return error.PtxArchNotSupported;
if (!options.target.cpu.arch.isNvptx()) return error.PtxArchNotSupported;
switch (options.target.os.tag) {
// TODO: does it also work with nvcl ?
.cuda => {},
else => return error.PtxArchNotSupported,
}
const llvm_object = try LlvmObject.create(gpa, options);
const nvptx = try gpa.create(NvPtx);
nvptx.* = .{
.base = .{
.tag = .nvptx,
.options = options,
.file = null,
.allocator = gpa,
},
.llvm_object = llvm_object,
.ptx_file_name = try std.mem.join(gpa, "", &[_][]const u8{ options.root_name, ".ptx" }),
};
return nvptx;
}
pub fn openPath(allocator: Allocator, sub_path: []const u8, options: link.Options) !*NvPtx {
if (!options.use_llvm) return error.PtxArchNotSupported;
assert(options.target.ofmt == .nvptx);
log.debug("Opening .ptx target file {s}", .{sub_path});
return createEmpty(allocator, options);
}
pub fn deinit(self: *NvPtx) void {
self.llvm_object.destroy(self.base.allocator);
self.base.allocator.free(self.ptx_file_name);
}
pub fn updateFunc(self: *NvPtx, module: *Module, func_index: InternPool.Index, air: Air, liveness: Liveness) !void {
try self.llvm_object.updateFunc(module, func_index, air, liveness);
}
pub fn updateDecl(self: *NvPtx, module: *Module, decl_index: Module.Decl.Index) !void {
return self.llvm_object.updateDecl(module, decl_index);
}
pub fn updateDeclExports(
self: *NvPtx,
module: *Module,
decl_index: Module.Decl.Index,
exports: []const *Module.Export,
) !void {
if (build_options.skip_non_native and builtin.object_format != .nvptx) {
@panic("Attempted to compile for object format that was disabled by build configuration");
}
return self.llvm_object.updateDeclExports(module, decl_index, exports);
}
pub fn freeDecl(self: *NvPtx, decl_index: Module.Decl.Index) void {
return self.llvm_object.freeDecl(decl_index);
}
pub fn flush(self: *NvPtx, comp: *Compilation, prog_node: *std.Progress.Node) link.File.FlushError!void {
return self.flushModule(comp, prog_node);
}
pub fn flushModule(self: *NvPtx, comp: *Compilation, prog_node: *std.Progress.Node) link.File.FlushError!void {
if (build_options.skip_non_native) {
@panic("Attempted to compile for architecture that was disabled by build configuration");
}
const outfile = comp.bin_file.options.emit orelse return;
const tracy = trace(@src());
defer tracy.end();
// We modify 'comp' before passing it to LLVM, but restore value afterwards.
// We tell LLVM to not try to build a .o, only an "assembly" file.
// This is required by the LLVM PTX backend.
comp.bin_file.options.emit = null;
comp.emit_asm = .{
// 'null' means using the default cache dir: zig-cache/o/...
.directory = null,
.basename = self.ptx_file_name,
};
defer {
comp.bin_file.options.emit = outfile;
comp.emit_asm = null;
}
try self.llvm_object.flushModule(comp, prog_node);
}
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