5aa84a744b
* initial set of work for windows fastcall (x64) call convention - call conventions: rename `fastcall` to `windows_fastcall` - add initial set of filetests - ensure arguments are written after the shadow space/store (offset-wise) The shadow space available before the arguments (range 0..32) is not used as spill space yet. * address review feedback
113 lines
3.7 KiB
Rust
113 lines
3.7 KiB
Rust
//! Performs autodetection of the host for the purposes of running
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//! Cretonne to generate code to run on the same machine.
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#![deny(missing_docs, trivial_numeric_casts, unused_extern_crates)]
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#![warn(unused_import_braces, unstable_features)]
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#![cfg_attr(feature = "clippy", plugin(clippy(conf_file = "../../clippy.toml")))]
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#![cfg_attr(feature = "cargo-clippy",
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allow(new_without_default, new_without_default_derive))]
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#![cfg_attr(feature="cargo-clippy", warn(
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float_arithmetic,
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mut_mut,
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nonminimal_bool,
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option_map_unwrap_or,
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option_map_unwrap_or_else,
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print_stdout,
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unicode_not_nfc,
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use_self,
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))]
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#![cfg_attr(not(feature = "std"), no_std)]
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extern crate cretonne_codegen;
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#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
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extern crate raw_cpuid;
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use cretonne_codegen::isa;
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use cretonne_codegen::settings::{self, Configurable};
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#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
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use raw_cpuid::CpuId;
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/// Return `settings` and `isa` builders configured for the current host
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/// machine, or `Err(())` if the host machine is not supported
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/// in the current configuration.
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pub fn builders() -> Result<(settings::Builder, isa::Builder), &'static str> {
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let mut flag_builder = settings::builder();
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if cfg!(any(unix, target_os = "nebulet")) {
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flag_builder.set("call_conv", "system_v").unwrap();
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} else if cfg!(windows) {
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flag_builder.set("call_conv", "windows_fastcall").unwrap();
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} else {
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return Err("unrecognized environment");
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}
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if cfg!(target_pointer_width = "64") {
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flag_builder.enable("is_64bit").unwrap();
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} else if !cfg!(target_pointer_width = "32") {
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return Err("unrecognized pointer size");
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}
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// TODO: Add RISC-V support once Rust supports it.
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let name = if cfg!(any(target_arch = "x86", target_arch = "x86_64")) {
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"x86"
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} else if cfg!(target_arch = "arm") {
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"arm32"
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} else if cfg!(target_arch = "aarch64") {
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"arm64"
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} else {
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return Err("unrecognized architecture");
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};
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let mut isa_builder = isa::lookup(name).map_err(|err| match err {
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isa::LookupError::Unknown => panic!(),
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isa::LookupError::Unsupported => "unsupported architecture",
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})?;
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if cfg!(any(target_arch = "x86", target_arch = "x86_64")) {
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parse_x86_cpuid(&mut isa_builder)?;
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}
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Ok((flag_builder, isa_builder))
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}
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#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]
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fn parse_x86_cpuid(isa_builder: &mut isa::Builder) -> Result<(), &'static str> {
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let cpuid = CpuId::new();
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if let Some(info) = cpuid.get_feature_info() {
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if !info.has_sse2() {
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return Err("x86 support requires SSE2");
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}
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if info.has_sse3() {
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isa_builder.enable("has_sse3").unwrap();
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}
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if info.has_sse41() {
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isa_builder.enable("has_sse41").unwrap();
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}
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if info.has_sse42() {
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isa_builder.enable("has_sse42").unwrap();
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}
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if info.has_popcnt() {
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isa_builder.enable("has_popcnt").unwrap();
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}
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if info.has_avx() {
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isa_builder.enable("has_avx").unwrap();
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}
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}
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if let Some(info) = cpuid.get_extended_feature_info() {
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if info.has_bmi1() {
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isa_builder.enable("has_bmi1").unwrap();
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}
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if info.has_bmi2() {
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isa_builder.enable("has_bmi2").unwrap();
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}
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}
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if let Some(info) = cpuid.get_extended_function_info() {
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if info.has_lzcnt() {
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isa_builder.enable("has_lzcnt").unwrap();
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}
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}
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Ok(())
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}
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