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Switch to using `llvm_asm!` instead of `asm!` (#351) 

* Switch to using `llvm_asm!` instead of `asm!`

* Run rustfmt

* Fix how LTO is specified on nightly
master
Alex Crichton 2020-04-29 15:30:10 -05:00 committed by GitHub
parent 25ea08da28
commit cde22bc180
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GPG Key ID: 4AEE18F83AFDEB23
7 changed files with 128 additions and 110 deletions
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6
ci/run.sh
View File

@ -85,9 +85,11 @@ RUSTFLAGS="-C debug-assertions=no" $build_intrinsics --features c --release
if [ -z "$DEBUG_LTO_BUILD_DOESNT_WORK" ]; then
RUSTFLAGS="-C debug-assertions=no" \
CARGO_INCREMENTAL=0 \
$cargo rustc --features "$INTRINSICS_FEATURES" --target $1 --example intrinsics -- -C lto
CARGO_PROFILE_DEV_LTO=true \
$cargo rustc --features "$INTRINSICS_FEATURES" --target $1 --example intrinsics
fi
$cargo rustc --features "$INTRINSICS_FEATURES" --target $1 --example intrinsics --release -- -C lto
CARGO_PROFILE_RELEASE_LTO=true \
$cargo rustc --features "$INTRINSICS_FEATURES" --target $1 --example intrinsics --release
# Ensure no references to a panicking function
for rlib in $(echo $path); do

4
examples/intrinsics.rs
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@ -6,7 +6,7 @@
#![allow(unused_features)]
#![cfg_attr(thumb, no_main)]
#![deny(dead_code)]
#![feature(asm)]
#![feature(llvm_asm)]
#![feature(lang_items)]
#![feature(start)]
#![feature(allocator_api)]
@ -280,7 +280,7 @@ fn run() {
// A copy of "test::black_box". Used to prevent LLVM from optimizing away the intrinsics during LTO
fn bb<T>(dummy: T) -> T {
unsafe { asm!("" : : "r"(&dummy)) }
unsafe { llvm_asm!("" : : "r"(&dummy)) }
dummy
}

48
src/arm.rs
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@ -8,13 +8,15 @@ use core::intrinsics;
#[naked]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
pub unsafe fn __aeabi_uidivmod() {
asm!("push {lr}
llvm_asm!("
push {lr}
sub sp, sp, #4
mov r2, sp
bl __udivmodsi4
ldr r1, [sp]
add sp, sp, #4
pop {pc}" ::: "memory" : "volatile");
pop {pc}
" ::: "memory" : "volatile");
intrinsics::unreachable();
}
@ -22,13 +24,15 @@ pub unsafe fn __aeabi_uidivmod() {
#[naked]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
pub unsafe fn __aeabi_uidivmod() {
asm!("push {lr}
llvm_asm!("
push {lr}
sub sp, sp, #4
mov r2, sp
bl ___udivmodsi4
ldr r1, [sp]
add sp, sp, #4
pop {pc}" ::: "memory" : "volatile");
pop {pc}
" ::: "memory" : "volatile");
intrinsics::unreachable();
}
@ -36,7 +40,8 @@ pub unsafe fn __aeabi_uidivmod() {
#[naked]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
pub unsafe fn __aeabi_uldivmod() {
asm!("push {r4, lr}
llvm_asm!("
push {r4, lr}
sub sp, sp, #16
add r4, sp, #8
str r4, [sp]
@ -44,7 +49,8 @@ pub unsafe fn __aeabi_uldivmod() {
ldr r2, [sp, #8]
ldr r3, [sp, #12]
add sp, sp, #16
pop {r4, pc}" ::: "memory" : "volatile");
pop {r4, pc}
" ::: "memory" : "volatile");
intrinsics::unreachable();
}
@ -52,7 +58,8 @@ pub unsafe fn __aeabi_uldivmod() {
#[naked]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
pub unsafe fn __aeabi_uldivmod() {
asm!("push {r4, lr}
llvm_asm!("
push {r4, lr}
sub sp, sp, #16
add r4, sp, #8
str r4, [sp]
@ -60,7 +67,8 @@ pub unsafe fn __aeabi_uldivmod() {
ldr r2, [sp, #8]
ldr r3, [sp, #12]
add sp, sp, #16
pop {r4, pc}" ::: "memory" : "volatile");
pop {r4, pc}
" ::: "memory" : "volatile");
intrinsics::unreachable();
}
@ -68,12 +76,14 @@ pub unsafe fn __aeabi_uldivmod() {
#[naked]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
pub unsafe fn __aeabi_idivmod() {
asm!("push {r0, r1, r4, lr}
llvm_asm!("
push {r0, r1, r4, lr}
bl __aeabi_idiv
pop {r1, r2}
muls r2, r2, r0
subs r1, r1, r2
pop {r4, pc}" ::: "memory" : "volatile");
pop {r4, pc}
" ::: "memory" : "volatile");
intrinsics::unreachable();
}
@ -81,12 +91,14 @@ pub unsafe fn __aeabi_idivmod() {
#[naked]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
pub unsafe fn __aeabi_idivmod() {
asm!("push {r0, r1, r4, lr}
llvm_asm!("
push {r0, r1, r4, lr}
bl ___aeabi_idiv
pop {r1, r2}
muls r2, r2, r0
subs r1, r1, r2
pop {r4, pc}" ::: "memory" : "volatile");
pop {r4, pc}
" ::: "memory" : "volatile");
intrinsics::unreachable();
}
@ -94,7 +106,8 @@ pub unsafe fn __aeabi_idivmod() {
#[naked]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
pub unsafe fn __aeabi_ldivmod() {
asm!("push {r4, lr}
llvm_asm!("
push {r4, lr}
sub sp, sp, #16
add r4, sp, #8
str r4, [sp]
@ -102,7 +115,8 @@ pub unsafe fn __aeabi_ldivmod() {
ldr r2, [sp, #8]
ldr r3, [sp, #12]
add sp, sp, #16
pop {r4, pc}" ::: "memory" : "volatile");
pop {r4, pc}
" ::: "memory" : "volatile");
intrinsics::unreachable();
}
@ -110,7 +124,8 @@ pub unsafe fn __aeabi_ldivmod() {
#[naked]
#[cfg_attr(not(feature = "mangled-names"), no_mangle)]
pub unsafe fn __aeabi_ldivmod() {
asm!("push {r4, lr}
llvm_asm!("
push {r4, lr}
sub sp, sp, #16
add r4, sp, #8
str r4, [sp]
@ -118,7 +133,8 @@ pub unsafe fn __aeabi_ldivmod() {
ldr r2, [sp, #8]
ldr r3, [sp, #12]
add sp, sp, #16
pop {r4, pc}" ::: "memory" : "volatile");
pop {r4, pc}
" ::: "memory" : "volatile");
intrinsics::unreachable();
}

2
src/int/mod.rs
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@ -136,7 +136,7 @@ macro_rules! int_impl_common {
fn leading_zeros(self) -> u32 {
<Self>::leading_zeros(self)
}
}
};
}
macro_rules! int_impl {

2
src/lib.rs
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@ -1,6 +1,6 @@
#![cfg_attr(feature = "compiler-builtins", compiler_builtins)]
#![feature(abi_unadjusted)]
#![feature(asm)]
#![feature(llvm_asm)]
#![feature(global_asm)]
#![feature(cfg_target_has_atomic)]
#![feature(compiler_builtins)]

6
src/x86.rs
View File

@ -12,7 +12,7 @@ use core::intrinsics;
#[naked]
#[no_mangle]
pub unsafe fn ___chkstk_ms() {
asm!("
llvm_asm!("
push %ecx
push %eax
cmp $$0x1000,%eax
@ -38,7 +38,7 @@ pub unsafe fn ___chkstk_ms() {
#[naked]
#[no_mangle]
pub unsafe fn __alloca() {
asm!("jmp ___chkstk // Jump to ___chkstk since fallthrough may be unreliable"
llvm_asm!("jmp ___chkstk // Jump to ___chkstk since fallthrough may be unreliable"
::: "memory" : "volatile");
intrinsics::unreachable();
}
@ -47,7 +47,7 @@ pub unsafe fn __alloca() {
#[naked]
#[no_mangle]
pub unsafe fn ___chkstk() {
asm!("
llvm_asm!("
push %ecx
cmp $$0x1000,%eax
lea 8(%esp),%ecx // esp before calling this routine -> ecx

6
src/x86_64.rs
View File

@ -12,7 +12,7 @@ use core::intrinsics;
#[naked]
#[no_mangle]
pub unsafe fn ___chkstk_ms() {
asm!("
llvm_asm!("
push %rcx
push %rax
cmp $$0x1000,%rax
@ -37,7 +37,7 @@ pub unsafe fn ___chkstk_ms() {
#[naked]
#[no_mangle]
pub unsafe fn __alloca() {
asm!("mov %rcx,%rax // x64 _alloca is a normal function with parameter in rcx
llvm_asm!("mov %rcx,%rax // x64 _alloca is a normal function with parameter in rcx
jmp ___chkstk // Jump to ___chkstk since fallthrough may be unreliable"
::: "memory" : "volatile");
intrinsics::unreachable();
@ -47,7 +47,7 @@ pub unsafe fn __alloca() {
#[naked]
#[no_mangle]
pub unsafe fn ___chkstk() {
asm!(
llvm_asm!(
"
push %rcx
cmp $$0x1000,%rax