468 lines
9.4 KiB
Rust
468 lines
9.4 KiB
Rust
// By compiling this file we check that all the intrinsics we care about continue to be provided by
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// the `compiler_builtins` crate regardless of the changes we make to it. If we, by mistake, stop
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// compiling a C implementation and forget to implement that intrinsic in Rust, this file will fail
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// to link due to the missing intrinsic (symbol).
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#![allow(unused_features)]
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#![cfg_attr(thumb, no_main)]
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#![deny(dead_code)]
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#![feature(alloc_system)]
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#![feature(asm)]
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#![feature(compiler_builtins_lib)]
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#![feature(core_float)]
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#![feature(lang_items)]
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#![feature(start)]
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#![feature(i128_type)]
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#![feature(global_allocator)]
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#![feature(allocator_api)]
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#![cfg_attr(windows, feature(panic_unwind))]
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#![no_std]
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#[cfg(not(thumb))]
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extern crate alloc_system;
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extern crate compiler_builtins;
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#[cfg(windows)]
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extern crate panic_unwind;
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#[cfg(not(thumb))]
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#[global_allocator]
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static A: alloc_system::System = alloc_system::System;
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// NOTE cfg(not(thumbv6m)) means that the operation is not supported on ARMv6-M at all. Not even
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// compiler-rt provides a C/assembly implementation.
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// Every function in this module maps will be lowered to an intrinsic by LLVM, if the platform
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// doesn't have native support for the operation used in the function. ARM has a naming convention
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// convention for its intrinsics that's different from other architectures; that's why some function
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// have an additional comment: the function name is the ARM name for the intrinsic and the comment
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// in the non-ARM name for the intrinsic.
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mod intrinsics {
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use core::num::Float;
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// trunccdfsf2
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pub fn aeabi_d2f(x: f64) -> f32 {
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x as f32
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}
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// fixdfsi
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pub fn aeabi_d2i(x: f64) -> i32 {
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x as i32
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}
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// fixdfdi
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#[cfg(not(thumbv6m))]
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pub fn aeabi_d2l(x: f64) -> i64 {
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x as i64
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}
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#[cfg(thumbv6m)]
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pub fn aeabi_d2l(_: f64) -> i64 {
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0
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}
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// fixunsdfsi
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pub fn aeabi_d2uiz(x: f64) -> u32 {
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x as u32
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}
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// fixunsdfdi
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#[cfg(not(thumbv6m))]
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pub fn aeabi_d2ulz(x: f64) -> u64 {
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x as u64
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}
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#[cfg(thumbv6m)]
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pub fn aeabi_d2ulz(_: f64) -> u64 {
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0
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}
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// adddf3
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pub fn aeabi_dadd(a: f64, b: f64) -> f64 {
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a + b
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}
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// eqdf2
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#[cfg(not(thumbv6m))]
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pub fn aeabi_dcmpeq(a: f64, b: f64) -> bool {
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a == b
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}
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#[cfg(thumbv6m)]
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pub fn aeabi_dcmpeq(_: f64, _: f64) -> bool {
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true
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}
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// gtdf2
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#[cfg(not(thumbv6m))]
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pub fn aeabi_dcmpgt(a: f64, b: f64) -> bool {
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a > b
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}
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#[cfg(thumbv6m)]
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pub fn aeabi_dcmpgt(_: f64, _: f64) -> bool {
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true
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}
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// ltdf2
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#[cfg(not(thumbv6m))]
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pub fn aeabi_dcmplt(a: f64, b: f64) -> bool {
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a < b
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}
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#[cfg(thumbv6m)]
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pub fn aeabi_dcmplt(_: f64, _: f64) -> bool {
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true
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}
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// divdf3
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pub fn aeabi_ddiv(a: f64, b: f64) -> f64 {
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a / b
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}
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// muldf3
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pub fn aeabi_dmul(a: f64, b: f64) -> f64 {
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a * b
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}
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// subdf3
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pub fn aeabi_dsub(a: f64, b: f64) -> f64 {
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a - b
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}
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// extendsfdf2
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pub fn aeabi_f2d(x: f32) -> f64 {
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x as f64
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}
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// fixsfsi
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pub fn aeabi_f2iz(x: f32) -> i32 {
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x as i32
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}
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// fixsfdi
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#[cfg(not(thumbv6m))]
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pub fn aeabi_f2lz(x: f32) -> i64 {
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x as i64
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}
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#[cfg(thumbv6m)]
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pub fn aeabi_f2lz(_: f32) -> i64 {
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0
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}
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// fixunssfsi
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pub fn aeabi_f2uiz(x: f32) -> u32 {
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x as u32
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}
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// fixunssfdi
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#[cfg(not(thumbv6m))]
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pub fn aeabi_f2ulz(x: f32) -> u64 {
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x as u64
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}
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#[cfg(thumbv6m)]
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pub fn aeabi_f2ulz(_: f32) -> u64 {
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0
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}
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// addsf3
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pub fn aeabi_fadd(a: f32, b: f32) -> f32 {
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a + b
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}
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// eqsf2
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#[cfg(not(thumbv6m))]
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pub fn aeabi_fcmpeq(a: f32, b: f32) -> bool {
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a == b
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}
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#[cfg(thumbv6m)]
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pub fn aeabi_fcmpeq(_: f32, _: f32) -> bool {
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true
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}
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// gtsf2
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#[cfg(not(thumbv6m))]
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pub fn aeabi_fcmpgt(a: f32, b: f32) -> bool {
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a > b
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}
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#[cfg(thumbv6m)]
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pub fn aeabi_fcmpgt(_: f32, _: f32) -> bool {
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true
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}
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// ltsf2
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#[cfg(not(thumbv6m))]
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pub fn aeabi_fcmplt(a: f32, b: f32) -> bool {
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a < b
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}
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#[cfg(thumbv6m)]
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pub fn aeabi_fcmplt(_: f32, _: f32) -> bool {
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true
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}
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// divsf3
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pub fn aeabi_fdiv(a: f32, b: f32) -> f32 {
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a / b
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}
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// mulsf3
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pub fn aeabi_fmul(a: f32, b: f32) -> f32 {
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a * b
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}
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// subsf3
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pub fn aeabi_fsub(a: f32, b: f32) -> f32 {
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a - b
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}
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// floatsidf
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pub fn aeabi_i2d(x: i32) -> f64 {
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x as f64
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}
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// floatsisf
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pub fn aeabi_i2f(x: i32) -> f32 {
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x as f32
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}
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pub fn aeabi_idiv(a: i32, b: i32) -> i32 {
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a.wrapping_div(b)
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}
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pub fn aeabi_idivmod(a: i32, b: i32) -> i32 {
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a % b
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}
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// floatdidf
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pub fn aeabi_l2d(x: i64) -> f64 {
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x as f64
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}
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// floatdisf
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pub fn aeabi_l2f(x: i64) -> f32 {
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x as f32
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}
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// divdi3
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pub fn aeabi_ldivmod(a: i64, b: i64) -> i64 {
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a / b
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}
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// muldi3
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pub fn aeabi_lmul(a: i64, b: i64) -> i64 {
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a.wrapping_mul(b)
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}
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// floatunsidf
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pub fn aeabi_ui2d(x: u32) -> f64 {
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x as f64
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}
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// floatunsisf
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pub fn aeabi_ui2f(x: u32) -> f32 {
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x as f32
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}
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pub fn aeabi_uidiv(a: u32, b: u32) -> u32 {
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a / b
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}
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pub fn aeabi_uidivmod(a: u32, b: u32) -> u32 {
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a % b
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}
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// floatundidf
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pub fn aeabi_ul2d(x: u64) -> f64 {
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x as f64
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}
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// floatundisf
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pub fn aeabi_ul2f(x: u64) -> f32 {
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x as f32
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}
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// udivdi3
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pub fn aeabi_uldivmod(a: u64, b: u64) -> u64 {
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a * b
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}
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pub fn moddi3(a: i64, b: i64) -> i64 {
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a % b
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}
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pub fn mulodi4(a: i64, b: i64) -> i64 {
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a * b
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}
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pub fn powidf2(a: f64, b: i32) -> f64 {
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a.powi(b)
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}
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pub fn powisf2(a: f32, b: i32) -> f32 {
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a.powi(b)
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}
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pub fn umoddi3(a: u64, b: u64) -> u64 {
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a % b
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}
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pub fn muloti4(a: u128, b: u128) -> Option<u128> {
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a.checked_mul(b)
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}
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pub fn multi3(a: u128, b: u128) -> u128 {
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a.wrapping_mul(b)
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}
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pub fn ashlti3(a: u128, b: usize) -> u128 {
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a >> b
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}
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pub fn ashrti3(a: u128, b: usize) -> u128 {
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a << b
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}
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pub fn lshrti3(a: i128, b: usize) -> i128 {
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a >> b
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}
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pub fn udivti3(a: u128, b: u128) -> u128 {
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a / b
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}
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pub fn umodti3(a: u128, b: u128) -> u128 {
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a % b
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}
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pub fn divti3(a: i128, b: i128) -> i128 {
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a / b
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}
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pub fn modti3(a: i128, b: i128) -> i128 {
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a % b
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}
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}
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fn run() {
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use intrinsics::*;
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// A copy of "test::black_box". Used to prevent LLVM from optimizing away the intrinsics during LTO
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fn bb<T>(dummy: T) -> T {
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unsafe { asm!("" : : "r"(&dummy)) }
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dummy
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}
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bb(aeabi_d2f(bb(2.)));
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bb(aeabi_d2i(bb(2.)));
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bb(aeabi_d2l(bb(2.)));
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bb(aeabi_d2uiz(bb(2.)));
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bb(aeabi_d2ulz(bb(2.)));
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bb(aeabi_dadd(bb(2.), bb(3.)));
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bb(aeabi_dcmpeq(bb(2.), bb(3.)));
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bb(aeabi_dcmpgt(bb(2.), bb(3.)));
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bb(aeabi_dcmplt(bb(2.), bb(3.)));
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bb(aeabi_ddiv(bb(2.), bb(3.)));
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bb(aeabi_dmul(bb(2.), bb(3.)));
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bb(aeabi_dsub(bb(2.), bb(3.)));
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bb(aeabi_f2d(bb(2.)));
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bb(aeabi_f2iz(bb(2.)));
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bb(aeabi_f2lz(bb(2.)));
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bb(aeabi_f2uiz(bb(2.)));
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bb(aeabi_f2ulz(bb(2.)));
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bb(aeabi_fadd(bb(2.), bb(3.)));
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bb(aeabi_fcmpeq(bb(2.), bb(3.)));
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bb(aeabi_fcmpgt(bb(2.), bb(3.)));
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bb(aeabi_fcmplt(bb(2.), bb(3.)));
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bb(aeabi_fdiv(bb(2.), bb(3.)));
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bb(aeabi_fmul(bb(2.), bb(3.)));
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bb(aeabi_fsub(bb(2.), bb(3.)));
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bb(aeabi_i2d(bb(2)));
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bb(aeabi_i2f(bb(2)));
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bb(aeabi_idiv(bb(2), bb(3)));
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bb(aeabi_idivmod(bb(2), bb(3)));
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bb(aeabi_l2d(bb(2)));
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bb(aeabi_l2f(bb(2)));
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bb(aeabi_ldivmod(bb(2), bb(3)));
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bb(aeabi_lmul(bb(2), bb(3)));
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bb(aeabi_ui2d(bb(2)));
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bb(aeabi_ui2f(bb(2)));
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bb(aeabi_uidiv(bb(2), bb(3)));
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bb(aeabi_uidivmod(bb(2), bb(3)));
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bb(aeabi_ul2d(bb(2)));
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bb(aeabi_ul2f(bb(2)));
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bb(aeabi_uldivmod(bb(2), bb(3)));
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bb(moddi3(bb(2), bb(3)));
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bb(mulodi4(bb(2), bb(3)));
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bb(powidf2(bb(2.), bb(3)));
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bb(powisf2(bb(2.), bb(3)));
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bb(umoddi3(bb(2), bb(3)));
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bb(muloti4(bb(2), bb(2)));
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bb(multi3(bb(2), bb(2)));
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bb(ashlti3(bb(2), bb(2)));
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bb(ashrti3(bb(2), bb(2)));
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bb(lshrti3(bb(2), bb(2)));
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bb(udivti3(bb(2), bb(2)));
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bb(umodti3(bb(2), bb(2)));
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bb(divti3(bb(2), bb(2)));
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bb(modti3(bb(2), bb(2)));
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something_with_a_dtor(&|| assert_eq!(bb(1), 1));
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}
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fn something_with_a_dtor(f: &Fn()) {
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struct A<'a>(&'a (Fn() + 'a));
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impl<'a> Drop for A<'a> {
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fn drop(&mut self) {
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(self.0)();
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}
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}
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let _a = A(f);
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f();
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}
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#[cfg(not(thumb))]
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#[start]
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fn main(_: isize, _: *const *const u8) -> isize {
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run();
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0
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}
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#[cfg(thumb)]
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#[no_mangle]
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pub fn _start() -> ! {
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run();
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loop {}
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}
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#[cfg(windows)]
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#[link(name = "kernel32")]
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#[link(name = "msvcrt")]
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extern {}
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// ARM targets need these symbols
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#[no_mangle]
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pub fn __aeabi_unwind_cpp_pr0() {}
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#[no_mangle]
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pub fn __aeabi_unwind_cpp_pr1() {}
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#[cfg(not(windows))]
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#[allow(non_snake_case)]
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#[no_mangle]
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pub fn _Unwind_Resume() {}
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#[cfg(not(windows))]
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#[lang = "eh_personality"]
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#[no_mangle]
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pub extern "C" fn eh_personality() {}
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#[lang = "panic_fmt"]
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#[no_mangle]
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#[allow(private_no_mangle_fns)]
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extern "C" fn panic_fmt() {}
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