From d20f54bb1a873a16681c687a58b7946dc6924913 Mon Sep 17 00:00:00 2001
From: bjorn3 <bjorn3@users.noreply.github.com>
Date: Mon, 5 Nov 2018 18:42:43 +0100
Subject: [PATCH] Add some benchmarks

---
 .travis.yml              |  1 +
 build.sh                 | 24 +++++++++++++++++++----
 example/alloc_example.rs | 41 ++++++++++++++++++++++++++++++++++++++++
 example/mod_bench.rs     | 37 ++++++++++++++++++++++++++++++++++++
 4 files changed, 99 insertions(+), 4 deletions(-)
 create mode 100644 example/alloc_example.rs
 create mode 100644 example/mod_bench.rs

diff --git a/.travis.yml b/.travis.yml
index db9dbdcc259..9ee74793c72 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,6 +8,7 @@ rust:
 script:
   - rustup component add rust-src
   - cargo install xargo || echo "Skipping xargo install"
+  - cargo install hyperfine || echo "Skipping hyperfine install"
   - ./prepare_libcore.sh
   - ./build.sh
 
diff --git a/build.sh b/build.sh
index 6bbf024044b..acb9bbc92d7 100755
--- a/build.sh
+++ b/build.sh
@@ -48,13 +48,29 @@ SHOULD_RUN=1 $RUSTC --crate-type bin example/mini_core_hello_world.rs --cfg jit
 echo "[AOT] mini_core_hello_world"
 build_example_bin mini_core_hello_world example/mini_core_hello_world.rs
 
-echo "[BUILD] core"
-time $RUSTC target/libcore/src/libcore/lib.rs --crate-type lib --crate-name core -Cincremental=target/incremental_core
-
 pushd xargo
 rm -r ~/.xargo/HOST || true
 rm -r target || true
-time xargo build --color always
+time xargo build
 popd
 
+$RUSTC --sysroot ~/.xargo/HOST example/alloc_example.rs --crate-type bin
+# TODO linux linker doesn't accept duplicate definitions
+#gcc -Wl,--gc-sections target/out/alloc_example ~/.xargo/HOST/lib/rustlib/*/lib/libcore-*.rlib ~/.xargo/HOST/lib/rustlib/*/lib/liballoc-*.rlib ~/.xargo/HOST/lib/rustlib/*/lib/liballoc_system-*.rlib -o target/out/alloc_example_exe
+#hyperfine ./target/out/alloc_example_exe
+
+$RUSTC --sysroot ~/.xargo/HOST example/mod_bench.rs --crate-type bin
+gcc -Wl,--gc-sections target/out/mod_bench -lc -o target/out/mod_bench_exe
+
+$RUSTC --sysroot ~/.xargo/HOST example/mod_bench.rs --crate-type bin -Zmir-opt-level=3 --crate-name mod_bench_inline
+gcc -Wl,--gc-sections target/out/mod_bench_inline -lc -o target/out/mod_bench_inline_exe
+
+rustc example/mod_bench.rs --crate-type bin -Copt-level=0 -o target/out/mod_bench_llvm_0 -Cpanic=abort
+rustc example/mod_bench.rs --crate-type bin -Copt-level=1 -o target/out/mod_bench_llvm_1 -Cpanic=abort
+rustc example/mod_bench.rs --crate-type bin -Copt-level=2 -o target/out/mod_bench_llvm_2 -Cpanic=abort
+rustc example/mod_bench.rs --crate-type bin -Copt-level=3 -o target/out/mod_bench_llvm_3 -Cpanic=abort
+echo
+echo "[Bench] mod_bench"
+hyperfine ./target/out/mod_bench{,_inline}_exe ./target/out/mod_bench_llvm_*
+
 cat target/out/log.txt | sort | uniq -c
diff --git a/example/alloc_example.rs b/example/alloc_example.rs
new file mode 100644
index 00000000000..06746ab1f76
--- /dev/null
+++ b/example/alloc_example.rs
@@ -0,0 +1,41 @@
+#![feature(start, box_syntax, alloc_system, core_intrinsics, alloc, alloc_error_handler)]
+#![no_std]
+
+extern crate alloc;
+extern crate alloc_system;
+
+use alloc::prelude::*;
+
+use alloc_system::System;
+
+#[global_allocator]
+static ALLOC: System = System;
+
+#[link(name = "c")]
+extern "C" {
+    fn puts(s: *const u8);
+}
+
+#[panic_handler]
+fn panic_handler(_: &core::panic::PanicInfo) -> ! {
+    unsafe {
+        core::intrinsics::abort();
+    }
+}
+
+#[alloc_error_handler]
+fn alloc_error_handler(_: alloc::alloc::Layout) -> ! {
+    unsafe {
+        core::intrinsics::abort();
+    }
+}
+
+#[start]
+fn main(_argc: isize, _argv: *const *const u8) -> isize {
+    let world: Box<&str> = box "Hello World!\0";
+    unsafe {
+        puts(*world as *const str as *const u8);
+    }
+
+    0
+}
diff --git a/example/mod_bench.rs b/example/mod_bench.rs
new file mode 100644
index 00000000000..2e2b0052dee
--- /dev/null
+++ b/example/mod_bench.rs
@@ -0,0 +1,37 @@
+#![feature(start, box_syntax, core_intrinsics, lang_items)]
+#![no_std]
+
+#[link(name = "c")]
+extern {}
+
+#[panic_handler]
+fn panic_handler(_: &core::panic::PanicInfo) -> ! {
+    unsafe {
+        core::intrinsics::abort();
+    }
+}
+
+#[lang="eh_personality"]
+fn eh_personality(){}
+
+// Required for rustc_codegen_llvm
+#[no_mangle]
+unsafe extern "C" fn _Unwind_Resume() {
+    core::intrinsics::unreachable();
+}
+
+#[start]
+fn main(_argc: isize, _argv: *const *const u8) -> isize {
+    for i in 2..100_000_000 {
+        black_box((i + 1) % i);
+    }
+
+    0
+}
+
+#[inline(never)]
+fn black_box(i: u32) {
+    if i != 1 {
+        unsafe { core::intrinsics::abort(); }
+    }
+}