initial commit

.gitignore

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+*.rs.bk
+Cargo.lock
+target

Cargo.toml

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+[package]
+authors = ["Jorge Aparicio <japaricious@gmail.com>"]
+name = "rustc_builtins"
+version = "0.1.0"

LICENSE-APACHE

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LICENSE-MIT

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+Copyright (c) 2016 Jorge Aparicio
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

README.md

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+[![Build Status][status]](https://travis-ci.org/japaric/rustc-builtins)
+
+[status]: https://travis-ci.org/japaric/rustc-builtins.svg?branch=master
+
+# `rustc-builtins`
+
+> [WIP] Porting `compiler-rt` intrinsics to Rust
+
+## License
+
+Licensed under either of
+
+- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
+  http://www.apache.org/licenses/LICENSE-2.0)
+- MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the
+work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any
+additional terms or conditions.

src/arm.rs

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+use core::intrinsics;
+
+macro_rules! defer {
+    ($($symbol:ident),+ -> $routine:ident) => {
+        $(
+            #[naked]
+            #[no_mangle]
+            pub extern "C" fn $symbol() {
+                unsafe {
+                    asm!(concat!("b ", stringify!($routine)));
+                    intrinsics::unreachable();
+                }
+            }
+        )+
+    }
+}
+
+// FIXME only `__aeabi_memcmp` should be defined like this. The `*4` and `*8` variants should be
+// defined as aliases of `__aeabi_memcmp`
+defer!(__aeabi_memcmp, __aeabi_memcmp4, __aeabi_memcmp8 -> memcmp);
+
+// FIXME same issue as `__aeabi_memcmp*`
+defer!(__aeabi_memcpy, __aeabi_memcpy4, __aeabi_memcpy8 -> memcpy);
+
+// FIXME same issue as `__aeabi_memcmp*`
+defer!(__aeabi_memmove, __aeabi_memmove4, __aeabi_memmove8 -> memmove);
+
+macro_rules! memset {
+    ($($symbol:ident),+) => {
+        $(
+            #[naked]
+            #[no_mangle]
+            pub extern "C" fn $symbol() {
+                unsafe {
+                    asm!("mov r3, r1
+                          mov r1, r2
+                          mov r2, r3
+                          b memset");
+                    intrinsics::unreachable();
+                }
+            }
+        )+
+    }
+}
+
+// FIXME same issue as `__aeabi_memcmp*`
+memset!(__aeabi_memset, __aeabi_memset4, __aeabi_memset8);
+
+macro_rules! memclr {
+    ($($symbol:ident),+) => {
+        $(
+            #[naked]
+            #[no_mangle]
+            pub extern "C" fn $symbol() {
+                unsafe {
+                    asm!("mov r2, r1
+                          mov r1, #0
+                          b memset");
+                    intrinsics::unreachable();
+                }
+            }
+        )+
+    }
+}
+
+// FIXME same issue as `__aeabi_memcmp*`
+memclr!(__aeabi_memclr, __aeabi_memclr4, __aeabi_memclr8);

src/lib.rs

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+#![allow(unused_features)]
+#![cfg_attr(not(test), no_std)]
+#![feature(asm)]
+#![feature(core_intrinsics)]
+#![feature(naked_functions)]
+// TODO(rust-lang/rust#35021) uncomment when that PR lands
+// #![feature(rustc_builtins)]
+
+#[cfg(test)]
+extern crate core;
+
+use core::mem;
+
+#[cfg(target_arch = "arm")]
+pub mod arm;
+
+#[cfg(target_arch = "x86_64")]
+pub mod x86_64;
+
+#[cfg(test)]
+mod test;
+
+const CHAR_BITS: usize = 8;
+
+macro_rules! absv_i2 {
+    ($intrinsic:ident : $ty:ty) => {
+        #[no_mangle]
+        pub extern "C" fn $intrinsic(x: $ty) -> $ty {
+            let n = mem::size_of::<$ty>() * CHAR_BITS;
+            if x == 1 << (n - 1) {
+                panic!();
+            }
+            let y = x >> (n - 1);
+            (x ^ y) - y
+        }
+
+    }
+}
+
+absv_i2!(__absvsi2: i32);
+absv_i2!(__absvdi2: i64);
+// TODO(rust-lang/35118)?
+// absv_i2!(__absvti2, i128);

src/test.rs

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+use std::panic;
+
+macro_rules! absv_i2 {
+    ($intrinsic:ident: $ty:ident) => {
+        #[test]
+        fn $intrinsic() {
+            assert!(panic::catch_unwind(|| ::$intrinsic(::std::$ty::MIN)).is_err());
+            assert_eq!(::$intrinsic(::std::$ty::MIN + 1), ::std::$ty::MAX);
+            assert_eq!(::$intrinsic(::std::$ty::MIN + 2), ::std::$ty::MAX - 1);
+            assert_eq!(::$intrinsic(-1), 1);
+            assert_eq!(::$intrinsic(-2), 2);
+            assert_eq!(::$intrinsic(0), 0);
+            assert_eq!(::$intrinsic(1), 1);
+            assert_eq!(::$intrinsic(2), 2);
+            assert_eq!(::$intrinsic(2), 2);
+            assert_eq!(::$intrinsic(::std::$ty::MAX - 1), ::std::$ty::MAX - 1);
+            assert_eq!(::$intrinsic(::std::$ty::MAX), ::std::$ty::MAX);
+        }
+    }
+}
+
+absv_i2!(__absvsi2: i32);
+absv_i2!(__absvdi2: i64);
+// TODO(rust-lang/35118)?
+// absv_i2!(__absvti2: i128);

src/x86_64.rs

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+#[no_mangle]
+pub extern "C" fn __floatdisf(x: i64) -> f32 {
+    x as f32
+}
+
+#[no_mangle]
+pub extern "C" fn __floatdidf(x: i64) -> f64 {
+    x as f64
+}