M-Labs/compiler-builtins-zynq
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Use the Rust implementation of udivsi3 on ARM

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Although compiler-rt presumably has a more optimized implementation written in
assembly, it appears buggy for whatever reason, causing #173.

For now let's see if integration into rust-lang/rust will work with the
Rust-defined implementation!
This commit is contained in:
Alex Crichton 2017-07-03 08:16:01 -07:00
parent a6bbbea236
commit 681aaa914d
3 changed files with 13 additions and 8 deletions
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17
build.rs
View File

@ -4196,7 +4196,6 @@ mod c {
"arm/clzsi2.S",
"arm/comparesf2.S",
"arm/divmodsi4.S",
"arm/divsi3.S",
"arm/modsi3.S",
"arm/switch16.S",
"arm/switch32.S",
@ -4204,8 +4203,20 @@ mod c {
"arm/switchu8.S",
"arm/sync_synchronize.S",
"arm/udivmodsi4.S",
"arm/udivsi3.S",
"arm/umodsi3.S",
// Exclude these two files for now even though we haven't
// translated their implementation into Rust yet (#173).
// They appear... buggy? The `udivsi3` implementation was
// the one that seemed buggy, but the `divsi3` file
// references a symbol from `udivsi3` so we compile them
// both with the Rust versions.
//
// Note that if these are added back they should be removed
// from thumbv6m below.
//
// "arm/divsi3.S",
// "arm/udivsi3.S",
],
);
}
@ -4315,14 +4326,12 @@ mod c {
"clzsi2",
"comparesf2",
"divmodsi4",
"divsi3",
"modsi3",
"switch16",
"switch32",
"switch8",
"switchu8",
"udivmodsi4",
"udivsi3",
"umodsi3",
],
);

1
src/int/sdiv.rs
View File

@ -57,7 +57,6 @@ impl Divmod for i32 {}
impl Divmod for i64 {}
intrinsics! {
#[use_c_shim_if(all(target_arch = "arm", not(target_os = "ios"), not(thumbv6m)))]
#[arm_aeabi_alias = __aeabi_idiv]
pub extern "C" fn __divsi3(a: i32, b: i32) -> i32 {
a.div(b)

3
src/int/udiv.rs
View File

@ -148,9 +148,6 @@ macro_rules! udivmod_inner {
}
intrinsics! {
#[use_c_shim_if(all(target_arch = "arm",
not(target_os = "ios"),
not(thumbv6m)))]
#[arm_aeabi_alias = __aeabi_uidiv]
/// Returns `n / d`
pub extern "C" fn __udivsi3(n: u32, d: u32) -> u32 {