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Support native CPU feature detection

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This commit is contained in:
David Gonzalez Martin 2024-04-17 12:29:37 -06:00
parent 9bfb150554
commit c38306be15
1 changed files with 21 additions and 2 deletions
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23
bootstrap/backend/llvm.zig
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@ -3258,7 +3258,26 @@ pub fn codegen(unit: *Compilation.Unit, context: *const Compilation.Context) !vo
.windows => "x86_64-windows-gnu",
};
const cpu = "generic";
const features = "";
const temp_use_native_features = true;
const features = if (temp_use_native_features) blk: {
var buffer = UnpinnedArray(u8){};
for (@import("builtin").cpu.arch.allFeaturesList(), 0..) |feature, index_usize| {
const index = @as(std.Target.Cpu.Feature.Set.Index, @intCast(index_usize));
const is_enabled = @import("builtin").cpu.features.isEnabled(index);
if (feature.llvm_name) |llvm_name| {
const plus_or_minus = "-+"[@intFromBool(is_enabled)];
try buffer.append(context.my_allocator, plus_or_minus);
try buffer.append_slice(context.my_allocator, llvm_name);
try buffer.append_slice(context.my_allocator, ",");
}
}
if (buffer.length == 0) break :blk "";
assert(std.mem.endsWith(u8, buffer.slice(), ","));
buffer.slice()[buffer.length - 1] = 0;
break :blk buffer.slice()[0 .. buffer.length - 1 :0];
} else "";
const target = blk: {
var error_message: [*]const u8 = undefined;
var error_message_len: usize = 0;
@ -3276,7 +3295,7 @@ pub fn codegen(unit: *Compilation.Unit, context: *const Compilation.Context) !vo
.optimize_for_speed, .optimize_for_size => .default,
.aggressively_optimize_for_speed, .aggressively_optimize_for_size => .aggressive,
};
const target_machine = target.createTargetMachine(target_triple.ptr, target_triple.len, cpu, cpu.len, features, features.len, LLVM.RelocationModel.static, code_model, is_code_model_present, codegen_optimization_level, jit) orelse unreachable;
const target_machine = target.createTargetMachine(target_triple.ptr, target_triple.len, cpu, cpu.len, features.ptr, features.len, LLVM.RelocationModel.static, code_model, is_code_model_present, codegen_optimization_level, jit) orelse unreachable;
llvm.module.setTargetMachineDataLayout(target_machine);
llvm.module.setTargetTriple(target_triple.ptr, target_triple.len);
const file_path = unit.descriptor.executable_path;