test our implementations against gcc_s

if it exposes the same intrinsics that we implement -- gcc_s doesn't
implement all the intrinsics for all the architectures.

closes #65

Cargo.toml

@@ -7,7 +7,10 @@ version = "0.1.0"
 rlibc = { git = "https://github.com/alexcrichton/rlibc", optional = true }
 
 [dev-dependencies]
+gcc_s = { path = "gcc_s" }
 quickcheck = "0.3.1"
 
 [features]
 default = ["rlibc/weak"]
+
+[workspace]

gcc_s/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+authors = ["Jorge Aparicio <japaricious@gmail.com>"]
+name = "gcc_s"
+version = "0.1.0"
+
+[dependencies]
+libloading = "0.3.0"

gcc_s/src/lib.rs

@@ -0,0 +1,51 @@
+#![feature(drop_types_in_const)]
+
+extern crate libloading;
+
+use std::sync::{Once, ONCE_INIT};
+
+use libloading::Library;
+
+static mut GCC_S: Option<Library> = None;
+
+fn gcc_s() -> &'static Library {
+    unsafe {
+        static INIT: Once = ONCE_INIT;
+
+        INIT.call_once(|| {
+            GCC_S = Some(Library::new("libgcc_s.so.1").unwrap());
+        });
+        GCC_S.as_ref().unwrap()
+    }
+}
+
+macro_rules! declare {
+    ($symbol:ident: fn($($i:ty),+) -> $o:ty) => {
+        pub fn $symbol() -> Option<unsafe extern fn($($i),+) -> $o> {
+            unsafe {
+                gcc_s().get(concat!("__", stringify!($symbol)).as_bytes()).ok().map(|s| *s)
+            }
+        }
+    }
+}
+
+declare!(ashldi3: fn(u64, u32) -> u64);
+declare!(ashrdi3: fn(i64, u32) -> i64);
+declare!(divdi3: fn(i64, i64) -> i64);
+declare!(divmoddi4: fn(i64, i64, &mut i64) -> i64);
+declare!(divmodsi4: fn(i32, i32, &mut i32) -> i32);
+declare!(divsi3: fn(i32, i32) -> i32);
+declare!(lshrdi3: fn(u64, u32) -> u64);
+declare!(moddi3: fn(i64, i64) -> i64);
+declare!(modsi3: fn(i32, i32) -> i32);
+declare!(muldi3: fn(u64, u64) -> u64);
+declare!(mulodi4: fn(i64, i64, &mut i32) -> i64);
+declare!(mulosi4: fn(i32, i32, &mut i32) -> i32);
+declare!(udivdi3: fn(u64, u64) -> u64);
+declare!(udivmoddi4: fn(u64, u64, Option<&mut u64>) -> u64);
+declare!(udivmodsi4: fn(u32, u32, Option<&mut u32>) -> u32);
+declare!(udivsi3: fn(u32, u32) -> u32);
+declare!(umoddi3: fn(u64, u64) -> u64);
+declare!(umodsi3: fn(u32, u32) -> u32);
+declare!(addsf3: fn(f32, f32) -> f32);
+declare!(adddf3: fn(f64, f64) -> f64);

src/float/add.rs

@@ -199,6 +199,8 @@ pub extern fn __aeabi_fadd(a: f32, b: f32) -> f32 {
 #[cfg(test)]
 mod tests {
     use core::{f32, f64};
+
+    use gcc_s;
     use qc::{U32, U64};
     use float::Float;
 
@@ -213,15 +215,23 @@ mod tests {
         fn addsf3(a: U32, b: U32) -> bool {
             let (a, b) = (f32::from_repr(a.0), f32::from_repr(b.0));
             let x = super::__addsf3(a, b);
-            let y = a + b;
+
-            x.eq_repr(y)
+            if let Some(addsf3) = gcc_s::addsf3() {
+               x.eq_repr(unsafe { addsf3(a, b) })
+            } else {
+                x.eq_repr(a + b)
+            }
         }
 
         fn adddf3(a: U64, b: U64) -> bool {
             let (a, b) = (f64::from_repr(a.0), f64::from_repr(b.0));
             let x = super::__adddf3(a, b);
-            let y = a + b;
+
-            x.eq_repr(y)
+            if let Some(adddf3) = gcc_s::adddf3() {
+                x.eq_repr(unsafe { adddf3(a, b) })
+            } else {
+                x.eq_repr(a + b)
+            }
         }
     }
     

src/int/mul.rs

@@ -72,13 +72,19 @@ mulo!(__mulodi4: i64);
 
 #[cfg(test)]
 mod tests {
+    use gcc_s;
     use qc::{I32, I64, U64};
 
     quickcheck! {
         fn muldi(a: U64, b: U64) -> bool {
             let (a, b) = (a.0, b.0);
             let r = super::__muldi3(a, b);
-            r == a.wrapping_mul(b)
+
+            if let Some(muldi3) = gcc_s::muldi3() {
+                r == unsafe { muldi3(a, b) }
+            } else {
+                r == a.wrapping_mul(b)
+            }
         }
 
         fn mulosi(a: I32, b: I32) -> bool {
@@ -88,7 +94,17 @@ mod tests {
             if overflow != 0 && overflow != 1 {
                 return false;
             }
-            (r, overflow != 0) == a.overflowing_mul(b)
+
+            if let Some(mulosi4) = gcc_s::mulosi4() {
+                let mut gcc_s_overflow = 2;
+                let gcc_s_r = unsafe {
+                    mulosi4(a, b, &mut gcc_s_overflow)
+                };
+
+                (r, overflow) == (gcc_s_r, gcc_s_overflow)
+            } else {
+                (r, overflow != 0) == a.overflowing_mul(b)
+            }
         }
 
         fn mulodi(a: I64, b: I64) -> bool {
@@ -98,7 +114,17 @@ mod tests {
             if overflow != 0 && overflow != 1 {
                 return false;
             }
-            (r, overflow != 0) == a.overflowing_mul(b)
+
+            if let Some(mulodi4) = gcc_s::mulodi4() {
+                let mut gcc_s_overflow = 2;
+                let gcc_s_r = unsafe {
+                    mulodi4(a, b, &mut gcc_s_overflow)
+                };
+
+                (r, overflow) == (gcc_s_r, gcc_s_overflow)
+            } else {
+                (r, overflow != 0) == a.overflowing_mul(b)
+            }
         }
     }
 }

src/int/sdiv.rs

@@ -52,6 +52,7 @@ divmod!(__divmoddi4, __divdi3: i64);
 
 #[cfg(test)]
 mod tests {
+    use gcc_s;
     use quickcheck::TestResult;
     use qc::{U32, U64};
 
@@ -62,7 +63,12 @@ mod tests {
                 TestResult::discard()
             } else {
                 let q = super::__divdi3(n, d);
-                TestResult::from_bool(q == n / d)
+
+                if let Some(divdi3) = gcc_s::divdi3() {
+                    TestResult::from_bool(q == unsafe { divdi3(n, d) })
+                } else {
+                    TestResult::from_bool(q == n / d)
+                }
             }
         }
 
@@ -72,7 +78,12 @@ mod tests {
                 TestResult::discard()
             } else {
                 let r = super::__moddi3(n, d);
-                TestResult::from_bool(r == n % d)
+
+                if let Some(moddi3) = gcc_s::moddi3() {
+                    TestResult::from_bool(r == unsafe { moddi3(n, d) })
+                } else {
+                    TestResult::from_bool(r == n % d)
+                }
             }
         }
 
@@ -83,7 +94,17 @@ mod tests {
             } else {
                 let mut r = 0;
                 let q = super::__divmoddi4(n, d, &mut r);
-                TestResult::from_bool(q == n / d && r == n % d)
+
+                if let Some(divmoddi4) = gcc_s::divmoddi4() {
+                    let mut gcc_s_r = 0;
+                    let gcc_s_q = unsafe {
+                        divmoddi4(n, d, &mut gcc_s_r)
+                    };
+
+                    TestResult::from_bool(q == gcc_s_q && r == gcc_s_r)
+                } else {
+                    TestResult::from_bool(q == n / d && r == n % d)
+                }
             }
         }
 
@@ -93,7 +114,12 @@ mod tests {
                 TestResult::discard()
             } else {
                 let q = super::__divsi3(n, d);
-                TestResult::from_bool(q == n / d)
+
+                if let Some(divsi3) = gcc_s::divsi3() {
+                    TestResult::from_bool(q == unsafe { divsi3(n, d)})
+                } else {
+                    TestResult::from_bool(q == n / d)
+                }
             }
         }
 
@@ -103,7 +129,12 @@ mod tests {
                 TestResult::discard()
             } else {
                 let r = super::__modsi3(n, d);
-                TestResult::from_bool(r == n % d)
+
+                if let Some(modsi3) = gcc_s::modsi3() {
+                    TestResult::from_bool(r == unsafe { modsi3(n, d) })
+                } else {
+                    TestResult::from_bool(r == n % d)
+                }
             }
         }
 
@@ -114,7 +145,17 @@ mod tests {
             } else {
                 let mut r = 0;
                 let q = super::__divmodsi4(n, d, &mut r);
-                TestResult::from_bool(q == n / d && r == n % d)
+
+                if let Some(divmodsi4) = gcc_s::divmodsi4() {
+                    let mut gcc_s_r = 0;
+                    let gcc_s_q = unsafe {
+                        divmodsi4(n, d, &mut gcc_s_r)
+                    };
+
+                    TestResult::from_bool(q == gcc_s_q && r == gcc_s_r)
+                } else {
+                    TestResult::from_bool(q == n / d && r == n % d)
+                }
             }
         }
     }

src/int/shift.rs

@@ -60,6 +60,7 @@ lshr!(__lshrdi3: u64);
 
 #[cfg(test)]
 mod tests {
+    use gcc_s;
     use quickcheck::TestResult;
     use qc::{I64, U64};
 
@@ -71,7 +72,12 @@ mod tests {
                 TestResult::discard()
             } else {
                 let r = super::__ashldi3(a, b);
-                TestResult::from_bool(r == a << b)
+
+                if let Some(ashldi3) = gcc_s::ashldi3() {
+                    TestResult::from_bool(r == unsafe { ashldi3(a, b) })
+                } else {
+                    TestResult::from_bool(r == a << b)
+                }
             }
         }
 
@@ -81,7 +87,12 @@ mod tests {
                 TestResult::discard()
             } else {
                 let r = super::__ashrdi3(a, b);
-                TestResult::from_bool(r == a >> b)
+
+                if let Some(ashrdi3) = gcc_s::ashrdi3() {
+                    TestResult::from_bool(r == unsafe { ashrdi3(a, b) })
+                } else {
+                    TestResult::from_bool(r == a >> b)
+                }
             }
         }
 
@@ -91,7 +102,12 @@ mod tests {
                 TestResult::discard()
             } else {
                 let r = super::__lshrdi3(a, b);
-                TestResult::from_bool(r == a >> b)
+
+                if let Some(lshrdi3) = gcc_s::lshrdi3() {
+                    TestResult::from_bool(r == unsafe { lshrdi3(a, b) })
+                } else {
+                    TestResult::from_bool(r == a >> b)
+                }
             }
         }
     }

src/int/udiv.rs

@@ -228,6 +228,7 @@ pub extern "C" fn __udivmoddi4(n: u64, d: u64, rem: Option<&mut u64>) -> u64 {
 
 #[cfg(test)]
 mod tests {
+    use gcc_s;
     use quickcheck::TestResult;
     use qc::{U32, U64};
 
@@ -238,7 +239,12 @@ mod tests {
                 TestResult::discard()
             } else {
                 let q = super::__udivdi3(n, d);
-                TestResult::from_bool(q == n / d)
+
+                if let Some(udivdi3) = gcc_s::udivdi3() {
+                    TestResult::from_bool(q == unsafe { udivdi3(n, d) })
+                } else {
+                    TestResult::from_bool(q == n / d)
+                }
             }
         }
 
@@ -248,7 +254,12 @@ mod tests {
                 TestResult::discard()
             } else {
                 let r = super::__umoddi3(n, d);
-                TestResult::from_bool(r == n % d)
+
+                if let Some(umoddi3) = gcc_s::umoddi3() {
+                    TestResult::from_bool(r == unsafe { umoddi3(n, d) })
+                } else {
+                    TestResult::from_bool(r == n % d)
+                }
             }
         }
 
@@ -259,7 +270,17 @@ mod tests {
             } else {
                 let mut r = 0;
                 let q = super::__udivmoddi4(n, d, Some(&mut r));
-                TestResult::from_bool(q == n / d && r == n % d)
+
+                if let Some(udivmoddi4) = gcc_s::udivmoddi4() {
+                    let mut gcc_s_r = 0;
+                    let gcc_s_q = unsafe {
+                        udivmoddi4(n, d, Some(&mut gcc_s_r))
+                    };
+
+                    TestResult::from_bool(q == gcc_s_q && r == gcc_s_r)
+                } else {
+                    TestResult::from_bool(q == n / d && r == n % d)
+                }
             }
         }
 
@@ -269,7 +290,12 @@ mod tests {
                 TestResult::discard()
             } else {
                 let q = super::__udivsi3(n, d);
-                TestResult::from_bool(q == n / d)
+
+                if let Some(udivsi3) = gcc_s::udivsi3() {
+                    TestResult::from_bool(q == unsafe { udivsi3(n, d) })
+                } else {
+                    TestResult::from_bool(q == n / d)
+                }
             }
         }
 
@@ -279,7 +305,12 @@ mod tests {
                 TestResult::discard()
             } else {
                 let r = super::__umodsi3(n, d);
-                TestResult::from_bool(r == n % d)
+
+                if let Some(umodsi3) = gcc_s::umodsi3() {
+                    TestResult::from_bool(r == unsafe { umodsi3(n, d) })
+                } else {
+                    TestResult::from_bool(r == n % d)
+                }
             }
         }
 
@@ -290,7 +321,17 @@ mod tests {
             } else {
                 let mut r = 0;
                 let q = super::__udivmodsi4(n, d, Some(&mut r));
-                TestResult::from_bool(q == n / d && r == n % d)
+
+                if let Some(udivmodsi4) = gcc_s::udivmodsi4() {
+                    let mut gcc_s_r = 0;
+                    let gcc_s_q = unsafe {
+                        udivmodsi4(n, d, Some(&mut gcc_s_r))
+                    };
+
+                    TestResult::from_bool(q == gcc_s_q && r == gcc_s_r)
+                } else {
+                    TestResult::from_bool(q == n / d && r == n % d)
+                }
             }
         }
     }

src/lib.rs

@@ -17,6 +17,9 @@ extern crate quickcheck;
 #[cfg(test)]
 extern crate core;
 
+#[cfg(test)]
+extern crate gcc_s;
+
 #[cfg(all(not(windows), not(target_os = "macos")))]
 extern crate rlibc;