feat: update building C code for x86 architecture.

Notes: 1. chunk_info has been moved to `common/mod.rs` since it will be
needed for all architectures

Author: madhav-madhusoodanan

crates/intrinsic-test/src/x86/compile.rs

@@ -0,0 +1,38 @@
+use crate::common::cli::ProcessedCli;
+use crate::common::compile_c::{CompilationCommandBuilder, CppCompilation};
+
+pub fn build_cpp_compilation(config: &ProcessedCli) -> Option<CppCompilation> {
+    let cpp_compiler = config.cpp_compiler.as_ref()?;
+
+    // -ffp-contract=off emulates Rust's approach of not fusing separate mul-add operations
+    let mut command = CompilationCommandBuilder::new()
+        .add_arch_flags(vec![
+            "avx",
+            "avx2",
+            "avx512f",
+            "avx512cd",
+            "avx512dq",
+            "avx512vl",
+            "avx512bw",
+            "avx512bf16",
+            "avx512bitalg",
+            "lzcnt",
+            "popcnt",
+            "adx",
+            "aes",
+        ])
+        .set_compiler(cpp_compiler)
+        .set_target(&config.target)
+        .set_opt_level("2")
+        .set_cxx_toolchain_dir(config.cxx_toolchain_dir.as_deref())
+        .set_project_root("c_programs")
+        .add_extra_flags(vec!["-ffp-contract=off", "-Wno-narrowing"]);
+
+    if !cpp_compiler.contains("clang") {
+        command = command.add_extra_flag("-flax-vector-conversions");
+    }
+
+    let mut cpp_compiler = command.into_cpp_compilation();
+
+    Some(cpp_compiler)
+}

crates/intrinsic-test/src/x86/config.rs

@@ -0,0 +1,25 @@
+pub fn build_notices(line_prefix: &str) -> String {
+    format!(
+        "\
+{line_prefix}This is a transient test file, not intended for distribution. Some aspects of the
+{line_prefix}test are derived from an XML specification, published under the same license as the
+{line_prefix}`intrinsic-test` crate.\n
+"
+    )
+}
+
+// Format f16 values (and vectors containing them) in a way that is consistent with C.
+pub const F16_FORMATTING_DEF: &str = r#"
+#[repr(transparent)]
+struct Hex<T>(T);
+ "#;
+
+pub const X86_CONFIGURATIONS: &str = r#"
+#![cfg_attr(target_arch = "x86", feature(stdarch_x86_avx512_bf16))]
+#![cfg_attr(target_arch = "x86", feature(stdarch_x86_avx512_f16))]
+#![cfg_attr(target_arch = "x86", feature(stdarch_x86_rtm))]
+#![cfg_attr(target_arch = "x86", feature(stdarch_x86_rtm))]
+#![cfg_attr(target_arch = "x86_64", feature(x86_amx_intrinsics))]
+#![cfg_attr(target_arch = "x86_64", feature(stdarch_x86_avx512_f16))]
+#![feature(fmt_helpers_for_derive)]
+"#;

crates/intrinsic-test/src/x86/mod.rs

@@ -1,14 +1,21 @@
+mod compile;
+mod config;
 mod constraint;
 mod intrinsic;
 mod types;
 mod xml_parser;
 
+use std::fs::{self, File};
+use rayon::prelude::*;
+
 use crate::common::cli::ProcessedCli;
 use crate::common::intrinsic::{Intrinsic, IntrinsicDefinition};
 use crate::common::intrinsic_helpers::TypeKind;
-use crate::common::SupportedArchitectureTest;
+use crate::common::{SupportedArchitectureTest, chunk_info};
+use crate::common::gen_c::{write_main_cpp, write_mod_cpp};
 use intrinsic::X86IntrinsicType;
 use xml_parser::get_xml_intrinsics;
+use config::build_notices;
 
 pub struct X86ArchitectureTest {
     intrinsics: Vec<Intrinsic<X86IntrinsicType>>,
@@ -42,7 +49,68 @@ impl SupportedArchitectureTest for X86ArchitectureTest {
     }
 
     fn build_c_file(&self) -> bool {
-        todo!("build_c_file in X86ArchitectureTest is not implemented")
+        let c_target = "aarch64";
+        let platform_headers = &["arm_neon.h", "arm_acle.h", "arm_fp16.h"];
+
+        let (chunk_size, chunk_count) = chunk_info(self.intrinsics.len());
+
+        let cpp_compiler_wrapped = compile::build_cpp_compilation(&self.cli_options);
+
+        let notice = &build_notices("// ");
+        fs::create_dir_all("c_programs").unwrap();
+        self.intrinsics
+            .par_chunks(chunk_size)
+            .enumerate()
+            .map(|(i, chunk)| {
+                let c_filename = format!("c_programs/mod_{i}.cpp");
+                let mut file = File::create(&c_filename).unwrap();
+                write_mod_cpp(&mut file, notice, c_target, platform_headers, chunk).unwrap();
+
+                // compile this cpp file into a .o file.
+                //
+                // This is done because `cpp_compiler_wrapped` is None when
+                // the --generate-only flag is passed
+                if let Some(cpp_compiler) = cpp_compiler_wrapped.as_ref() {
+                    let output = cpp_compiler
+                        .compile_object_file(&format!("mod_{i}.cpp"), &format!("mod_{i}.o"))?;
+                    assert!(output.status.success(), "{output:?}");
+                }
+
+                Ok(())
+            })
+            .collect::<Result<(), std::io::Error>>()
+            .unwrap();
+
+        let mut file = File::create("c_programs/main.cpp").unwrap();
+        write_main_cpp(
+            &mut file,
+            c_target,
+            "\n",
+            self.intrinsics.iter().map(|i| i.name.as_str()),
+        )
+        .unwrap();
+
+        // This is done because `cpp_compiler_wrapped` is None when
+        // the --generate-only flag is passed
+        if let Some(cpp_compiler) = cpp_compiler_wrapped.as_ref() {
+            // compile this cpp file into a .o file
+            info!("compiling main.cpp");
+            let output = cpp_compiler
+                .compile_object_file("main.cpp", "intrinsic-test-programs.o")
+                .unwrap();
+            assert!(output.status.success(), "{output:?}");
+
+            let object_files = (0..chunk_count)
+                .map(|i| format!("mod_{i}.o"))
+                .chain(["intrinsic-test-programs.o".to_owned()]);
+
+            let output = cpp_compiler
+                .link_executable(object_files, "intrinsic-test-programs")
+                .unwrap();
+            assert!(output.status.success(), "{output:?}");
+        }
+
+        true
     }
 
     fn build_rust_file(&self) -> bool {