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Extract some intrinsics out of rustc_codegen_llvm 

A significant amount of intrinsics do not actually need backend-specific
behaviors to be implemented, instead relying on methods already in
rustc_codegen_ssa. So, extract those methods out to rustc_codegen_ssa,
so that each backend doesn't need to reimplement the same code.
This commit is contained in:
khyperia 2020-09-15 23:35:31 +02:00
parent a874956d94
commit 21b0c1286a
4 changed files with 606 additions and 521 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

527
compiler/rustc_codegen_llvm/src/intrinsic.rs
View File

@ -7,15 +7,12 @@ use crate::type_of::LayoutLlvmExt;
use crate::va_arg::emit_va_arg;
use crate::value::Value;
use rustc_ast as ast;
use rustc_codegen_ssa::base::{compare_simd_types, wants_msvc_seh};
use rustc_codegen_ssa::common::span_invalid_monomorphization_error;
use rustc_codegen_ssa::common::{IntPredicate, TypeKind};
use rustc_codegen_ssa::glue;
use rustc_codegen_ssa::mir::operand::{OperandRef, OperandValue};
use rustc_codegen_ssa::mir::operand::OperandRef;
use rustc_codegen_ssa::mir::place::PlaceRef;
use rustc_codegen_ssa::traits::*;
use rustc_codegen_ssa::MemFlags;
use rustc_hir as hir;
use rustc_middle::ty::layout::{FnAbiExt, HasTyCtxt};
use rustc_middle::ty::{self, Ty};
@ -71,8 +68,6 @@ fn get_simple_intrinsic(cx: &CodegenCx<'ll, '_>, name: Symbol) -> Option<&'ll Va
sym::nearbyintf64 => "llvm.nearbyint.f64",
sym::roundf32 => "llvm.round.f32",
sym::roundf64 => "llvm.round.f64",
sym::assume => "llvm.assume",
sym::abort => "llvm.trap",
_ => return None,
};
Some(cx.get_intrinsic(&llvm_name))
@ -112,9 +107,6 @@ impl IntrinsicCallMethods<'tcx> for Builder<'a, 'll, 'tcx> {
&args.iter().map(|arg| arg.immediate()).collect::<Vec<_>>(),
None,
),
sym::unreachable => {
return;
}
sym::likely => {
let expect = self.get_intrinsic(&("llvm.expect.i1"));
self.call(expect, &[args[0].immediate(), self.const_bool(true)], None)
@ -137,8 +129,6 @@ impl IntrinsicCallMethods<'tcx> for Builder<'a, 'll, 'tcx> {
let llfn = self.get_intrinsic(&("llvm.debugtrap"));
self.call(llfn, &[], None)
}
sym::va_start => self.va_start(args[0].immediate()),
sym::va_end => self.va_end(args[0].immediate()),
sym::va_copy => {
let intrinsic = self.cx().get_intrinsic(&("llvm.va_copy"));
self.call(intrinsic, &[args[0].immediate(), args[1].immediate()], None)
@ -169,123 +159,7 @@ impl IntrinsicCallMethods<'tcx> for Builder<'a, 'll, 'tcx> {
_ => bug!("the va_arg intrinsic does not work with non-scalar types"),
}
}
sym::size_of_val => {
let tp_ty = substs.type_at(0);
if let OperandValue::Pair(_, meta) = args[0].val {
let (llsize, _) = glue::size_and_align_of_dst(self, tp_ty, Some(meta));
llsize
} else {
self.const_usize(self.size_of(tp_ty).bytes())
}
}
sym::min_align_of_val => {
let tp_ty = substs.type_at(0);
if let OperandValue::Pair(_, meta) = args[0].val {
let (_, llalign) = glue::size_and_align_of_dst(self, tp_ty, Some(meta));
llalign
} else {
self.const_usize(self.align_of(tp_ty).bytes())
}
}
sym::size_of
| sym::pref_align_of
| sym::min_align_of
| sym::needs_drop
| sym::type_id
| sym::type_name
| sym::variant_count => {
let value = self
.tcx
.const_eval_instance(ty::ParamEnv::reveal_all(), instance, None)
.unwrap();
OperandRef::from_const(self, value, ret_ty).immediate_or_packed_pair(self)
}
// Effectively no-op
sym::forget => {
return;
}
sym::offset => {
let ptr = args[0].immediate();
let offset = args[1].immediate();
self.inbounds_gep(ptr, &[offset])
}
sym::arith_offset => {
let ptr = args[0].immediate();
let offset = args[1].immediate();
self.gep(ptr, &[offset])
}
sym::copy_nonoverlapping => {
copy_intrinsic(
self,
false,
false,
substs.type_at(0),
args[1].immediate(),
args[0].immediate(),
args[2].immediate(),
);
return;
}
sym::copy => {
copy_intrinsic(
self,
true,
false,
substs.type_at(0),
args[1].immediate(),
args[0].immediate(),
args[2].immediate(),
);
return;
}
sym::write_bytes => {
memset_intrinsic(
self,
false,
substs.type_at(0),
args[0].immediate(),
args[1].immediate(),
args[2].immediate(),
);
return;
}
sym::volatile_copy_nonoverlapping_memory => {
copy_intrinsic(
self,
false,
true,
substs.type_at(0),
args[0].immediate(),
args[1].immediate(),
args[2].immediate(),
);
return;
}
sym::volatile_copy_memory => {
copy_intrinsic(
self,
true,
true,
substs.type_at(0),
args[0].immediate(),
args[1].immediate(),
args[2].immediate(),
);
return;
}
sym::volatile_set_memory => {
memset_intrinsic(
self,
true,
substs.type_at(0),
args[0].immediate(),
args[1].immediate(),
args[2].immediate(),
);
return;
}
sym::volatile_load | sym::unaligned_volatile_load => {
let tp_ty = substs.type_at(0);
let mut ptr = args[0].immediate();
@ -343,20 +217,6 @@ impl IntrinsicCallMethods<'tcx> for Builder<'a, 'll, 'tcx> {
| sym::ctpop
| sym::bswap
| sym::bitreverse
| sym::add_with_overflow
| sym::sub_with_overflow
| sym::mul_with_overflow
| sym::wrapping_add
| sym::wrapping_sub
| sym::wrapping_mul
| sym::unchecked_div
| sym::unchecked_rem
| sym::unchecked_shl
| sym::unchecked_shr
| sym::unchecked_add
| sym::unchecked_sub
| sym::unchecked_mul
| sym::exact_div
| sym::rotate_left
| sym::rotate_right
| sym::saturating_add
@ -396,84 +256,6 @@ impl IntrinsicCallMethods<'tcx> for Builder<'a, 'll, 'tcx> {
&[args[0].immediate()],
None,
),
sym::add_with_overflow
| sym::sub_with_overflow
| sym::mul_with_overflow => {
let intrinsic = format!(
"llvm.{}{}.with.overflow.i{}",
if signed { 's' } else { 'u' },
&name_str[..3],
width
);
let llfn = self.get_intrinsic(&intrinsic);
// Convert `i1` to a `bool`, and write it to the out parameter
let pair =
self.call(llfn, &[args[0].immediate(), args[1].immediate()], None);
let val = self.extract_value(pair, 0);
let overflow = self.extract_value(pair, 1);
let overflow = self.zext(overflow, self.type_bool());
let dest = result.project_field(self, 0);
self.store(val, dest.llval, dest.align);
let dest = result.project_field(self, 1);
self.store(overflow, dest.llval, dest.align);
return;
}
sym::wrapping_add => self.add(args[0].immediate(), args[1].immediate()),
sym::wrapping_sub => self.sub(args[0].immediate(), args[1].immediate()),
sym::wrapping_mul => self.mul(args[0].immediate(), args[1].immediate()),
sym::exact_div => {
if signed {
self.exactsdiv(args[0].immediate(), args[1].immediate())
} else {
self.exactudiv(args[0].immediate(), args[1].immediate())
}
}
sym::unchecked_div => {
if signed {
self.sdiv(args[0].immediate(), args[1].immediate())
} else {
self.udiv(args[0].immediate(), args[1].immediate())
}
}
sym::unchecked_rem => {
if signed {
self.srem(args[0].immediate(), args[1].immediate())
} else {
self.urem(args[0].immediate(), args[1].immediate())
}
}
sym::unchecked_shl => self.shl(args[0].immediate(), args[1].immediate()),
sym::unchecked_shr => {
if signed {
self.ashr(args[0].immediate(), args[1].immediate())
} else {
self.lshr(args[0].immediate(), args[1].immediate())
}
}
sym::unchecked_add => {
if signed {
self.unchecked_sadd(args[0].immediate(), args[1].immediate())
} else {
self.unchecked_uadd(args[0].immediate(), args[1].immediate())
}
}
sym::unchecked_sub => {
if signed {
self.unchecked_ssub(args[0].immediate(), args[1].immediate())
} else {
self.unchecked_usub(args[0].immediate(), args[1].immediate())
}
}
sym::unchecked_mul => {
if signed {
self.unchecked_smul(args[0].immediate(), args[1].immediate())
} else {
self.unchecked_umul(args[0].immediate(), args[1].immediate())
}
}
sym::rotate_left | sym::rotate_right => {
let is_left = name == sym::rotate_left;
let val = args[0].immediate();
@ -513,75 +295,6 @@ impl IntrinsicCallMethods<'tcx> for Builder<'a, 'll, 'tcx> {
}
}
}
sym::fadd_fast | sym::fsub_fast | sym::fmul_fast | sym::fdiv_fast | sym::frem_fast => {
match float_type_width(arg_tys[0]) {
Some(_width) => match name {
sym::fadd_fast => self.fadd_fast(args[0].immediate(), args[1].immediate()),
sym::fsub_fast => self.fsub_fast(args[0].immediate(), args[1].immediate()),
sym::fmul_fast => self.fmul_fast(args[0].immediate(), args[1].immediate()),
sym::fdiv_fast => self.fdiv_fast(args[0].immediate(), args[1].immediate()),
sym::frem_fast => self.frem_fast(args[0].immediate(), args[1].immediate()),
_ => bug!(),
},
None => {
span_invalid_monomorphization_error(
tcx.sess,
span,
&format!(
"invalid monomorphization of `{}` intrinsic: \
expected basic float type, found `{}`",
name, arg_tys[0]
),
);
return;
}
}
}
sym::float_to_int_unchecked => {
if float_type_width(arg_tys[0]).is_none() {
span_invalid_monomorphization_error(
tcx.sess,
span,
&format!(
"invalid monomorphization of `float_to_int_unchecked` \
intrinsic: expected basic float type, \
found `{}`",
arg_tys[0]
),
);
return;
}
let (width, signed) = match int_type_width_signed(ret_ty, self.cx) {
Some(pair) => pair,
None => {
span_invalid_monomorphization_error(
tcx.sess,
span,
&format!(
"invalid monomorphization of `float_to_int_unchecked` \
intrinsic: expected basic integer type, \
found `{}`",
ret_ty
),
);
return;
}
};
if signed {
self.fptosi(args[0].immediate(), self.cx.type_ix(width))
} else {
self.fptoui(args[0].immediate(), self.cx.type_ix(width))
}
}
sym::discriminant_value => {
if ret_ty.is_integral() {
args[0].deref(self.cx()).codegen_get_discr(self, ret_ty)
} else {
span_bug!(span, "Invalid discriminant type for `{:?}`", arg_tys[0])
}
}
_ if name_str.starts_with("simd_") => {
match generic_simd_intrinsic(self, name, callee_ty, args, ret_ty, llret_ty, span) {
@ -589,174 +302,6 @@ impl IntrinsicCallMethods<'tcx> for Builder<'a, 'll, 'tcx> {
Err(()) => return,
}
}
// This requires that atomic intrinsics follow a specific naming pattern:
// "atomic_<operation>[_<ordering>]", and no ordering means SeqCst
name if name_str.starts_with("atomic_") => {
use rustc_codegen_ssa::common::AtomicOrdering::*;
use rustc_codegen_ssa::common::{AtomicRmwBinOp, SynchronizationScope};
let split: Vec<&str> = name_str.split('_').collect();
let is_cxchg = split[1] == "cxchg" || split[1] == "cxchgweak";
let (order, failorder) = match split.len() {
2 => (SequentiallyConsistent, SequentiallyConsistent),
3 => match split[2] {
"unordered" => (Unordered, Unordered),
"relaxed" => (Monotonic, Monotonic),
"acq" => (Acquire, Acquire),
"rel" => (Release, Monotonic),
"acqrel" => (AcquireRelease, Acquire),
"failrelaxed" if is_cxchg => (SequentiallyConsistent, Monotonic),
"failacq" if is_cxchg => (SequentiallyConsistent, Acquire),
_ => self.sess().fatal("unknown ordering in atomic intrinsic"),
},
4 => match (split[2], split[3]) {
("acq", "failrelaxed") if is_cxchg => (Acquire, Monotonic),
("acqrel", "failrelaxed") if is_cxchg => (AcquireRelease, Monotonic),
_ => self.sess().fatal("unknown ordering in atomic intrinsic"),
},
_ => self.sess().fatal("Atomic intrinsic not in correct format"),
};
let invalid_monomorphization = |ty| {
span_invalid_monomorphization_error(
tcx.sess,
span,
&format!(
"invalid monomorphization of `{}` intrinsic: \
expected basic integer type, found `{}`",
name, ty
),
);
};
match split[1] {
"cxchg" | "cxchgweak" => {
let ty = substs.type_at(0);
if int_type_width_signed(ty, self).is_some() {
let weak = split[1] == "cxchgweak";
let pair = self.atomic_cmpxchg(
args[0].immediate(),
args[1].immediate(),
args[2].immediate(),
order,
failorder,
weak,
);
let val = self.extract_value(pair, 0);
let success = self.extract_value(pair, 1);
let success = self.zext(success, self.type_bool());
let dest = result.project_field(self, 0);
self.store(val, dest.llval, dest.align);
let dest = result.project_field(self, 1);
self.store(success, dest.llval, dest.align);
return;
} else {
return invalid_monomorphization(ty);
}
}
"load" => {
let ty = substs.type_at(0);
if int_type_width_signed(ty, self).is_some() {
let size = self.size_of(ty);
self.atomic_load(args[0].immediate(), order, size)
} else {
return invalid_monomorphization(ty);
}
}
"store" => {
let ty = substs.type_at(0);
if int_type_width_signed(ty, self).is_some() {
let size = self.size_of(ty);
self.atomic_store(
args[1].immediate(),
args[0].immediate(),
order,
size,
);
return;
} else {
return invalid_monomorphization(ty);
}
}
"fence" => {
self.atomic_fence(order, SynchronizationScope::CrossThread);
return;
}
"singlethreadfence" => {
self.atomic_fence(order, SynchronizationScope::SingleThread);
return;
}
// These are all AtomicRMW ops
op => {
let atom_op = match op {
"xchg" => AtomicRmwBinOp::AtomicXchg,
"xadd" => AtomicRmwBinOp::AtomicAdd,
"xsub" => AtomicRmwBinOp::AtomicSub,
"and" => AtomicRmwBinOp::AtomicAnd,
"nand" => AtomicRmwBinOp::AtomicNand,
"or" => AtomicRmwBinOp::AtomicOr,
"xor" => AtomicRmwBinOp::AtomicXor,
"max" => AtomicRmwBinOp::AtomicMax,
"min" => AtomicRmwBinOp::AtomicMin,
"umax" => AtomicRmwBinOp::AtomicUMax,
"umin" => AtomicRmwBinOp::AtomicUMin,
_ => self.sess().fatal("unknown atomic operation"),
};
let ty = substs.type_at(0);
if int_type_width_signed(ty, self).is_some() {
self.atomic_rmw(
atom_op,
args[0].immediate(),
args[1].immediate(),
order,
)
} else {
return invalid_monomorphization(ty);
}
}
}
}
sym::nontemporal_store => {
let dst = args[0].deref(self.cx());
args[1].val.nontemporal_store(self, dst);
return;
}
sym::ptr_guaranteed_eq | sym::ptr_guaranteed_ne => {
let a = args[0].immediate();
let b = args[1].immediate();
if name == sym::ptr_guaranteed_eq {
self.icmp(IntPredicate::IntEQ, a, b)
} else {
self.icmp(IntPredicate::IntNE, a, b)
}
}
sym::ptr_offset_from => {
let ty = substs.type_at(0);
let pointee_size = self.size_of(ty);
// This is the same sequence that Clang emits for pointer subtraction.
// It can be neither `nsw` nor `nuw` because the input is treated as
// unsigned but then the output is treated as signed, so neither works.
let a = args[0].immediate();
let b = args[1].immediate();
let a = self.ptrtoint(a, self.type_isize());
let b = self.ptrtoint(b, self.type_isize());
let d = self.sub(a, b);
let pointee_size = self.const_usize(pointee_size.bytes());
// this is where the signed magic happens (notice the `s` in `exactsdiv`)
self.exactsdiv(d, pointee_size)
}
_ => bug!("unknown intrinsic '{}'", name),
};
@ -807,39 +352,6 @@ impl IntrinsicCallMethods<'tcx> for Builder<'a, 'll, 'tcx> {
}
}
fn copy_intrinsic(
bx: &mut Builder<'a, 'll, 'tcx>,
allow_overlap: bool,
volatile: bool,
ty: Ty<'tcx>,
dst: &'ll Value,
src: &'ll Value,
count: &'ll Value,
) {
let (size, align) = bx.size_and_align_of(ty);
let size = bx.mul(bx.const_usize(size.bytes()), count);
let flags = if volatile { MemFlags::VOLATILE } else { MemFlags::empty() };
if allow_overlap {
bx.memmove(dst, align, src, align, size, flags);
} else {
bx.memcpy(dst, align, src, align, size, flags);
}
}
fn memset_intrinsic(
bx: &mut Builder<'a, 'll, 'tcx>,
volatile: bool,
ty: Ty<'tcx>,
dst: &'ll Value,
val: &'ll Value,
count: &'ll Value,
) {
let (size, align) = bx.size_and_align_of(ty);
let size = bx.mul(bx.const_usize(size.bytes()), count);
let flags = if volatile { MemFlags::VOLATILE } else { MemFlags::empty() };
bx.memset(dst, val, size, align, flags);
}
fn try_intrinsic(
bx: &mut Builder<'a, 'll, 'tcx>,
try_func: &'ll Value,
@ -2205,37 +1717,12 @@ unsupported {} from `{}` with element `{}` of size `{}` to `{}`"#,
// stuffs.
fn int_type_width_signed(ty: Ty<'_>, cx: &CodegenCx<'_, '_>) -> Option<(u64, bool)> {
match ty.kind() {
ty::Int(t) => Some((
match t {
ast::IntTy::Isize => u64::from(cx.tcx.sess.target.ptr_width),
ast::IntTy::I8 => 8,
ast::IntTy::I16 => 16,
ast::IntTy::I32 => 32,
ast::IntTy::I64 => 64,
ast::IntTy::I128 => 128,
},
true,
)),
ty::Uint(t) => Some((
match t {
ast::UintTy::Usize => u64::from(cx.tcx.sess.target.ptr_width),
ast::UintTy::U8 => 8,
ast::UintTy::U16 => 16,
ast::UintTy::U32 => 32,
ast::UintTy::U64 => 64,
ast::UintTy::U128 => 128,
},
false,
)),
_ => None,
}
}
// Returns the width of a float Ty
// Returns None if the type is not a float
fn float_type_width(ty: Ty<'_>) -> Option<u64> {
match ty.kind() {
ty::Float(t) => Some(t.bit_width()),
ty::Int(t) => {
Some((t.bit_width().unwrap_or(u64::from(cx.tcx.sess.target.ptr_width)), true))
}
ty::Uint(t) => {
Some((t.bit_width().unwrap_or(u64::from(cx.tcx.sess.target.ptr_width)), false))
}
_ => None,
}
}

3
compiler/rustc_codegen_ssa/src/mir/block.rs
View File

@ -687,7 +687,8 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
})
.collect();
bx.codegen_intrinsic_call(
Self::codegen_intrinsic_call(
&mut bx,
*instance.as_ref().unwrap(),
&fn_abi,
&args,

596
compiler/rustc_codegen_ssa/src/mir/intrinsic.rs Normal file
View File

@ -0,0 +1,596 @@
use super::operand::{OperandRef, OperandValue};
use super::place::PlaceRef;
use super::FunctionCx;
use crate::common::{span_invalid_monomorphization_error, IntPredicate};
use crate::glue;
use crate::traits::*;
use crate::MemFlags;
use rustc_middle::ty::{self, Ty, TyCtxt};
use rustc_span::{sym, Span};
use rustc_target::abi::call::{FnAbi, PassMode};
fn copy_intrinsic<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
bx: &mut Bx,
allow_overlap: bool,
volatile: bool,
ty: Ty<'tcx>,
dst: Bx::Value,
src: Bx::Value,
count: Bx::Value,
) {
let layout = bx.layout_of(ty);
let size = layout.size;
let align = layout.align.abi;
let size = bx.mul(bx.const_usize(size.bytes()), count);
let flags = if volatile { MemFlags::VOLATILE } else { MemFlags::empty() };
if allow_overlap {
bx.memmove(dst, align, src, align, size, flags);
} else {
bx.memcpy(dst, align, src, align, size, flags);
}
}
fn memset_intrinsic<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
bx: &mut Bx,
volatile: bool,
ty: Ty<'tcx>,
dst: Bx::Value,
val: Bx::Value,
count: Bx::Value,
) {
let layout = bx.layout_of(ty);
let size = layout.size;
let align = layout.align.abi;
let size = bx.mul(bx.const_usize(size.bytes()), count);
let flags = if volatile { MemFlags::VOLATILE } else { MemFlags::empty() };
bx.memset(dst, val, size, align, flags);
}
impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
pub fn codegen_intrinsic_call(
bx: &mut Bx,
instance: ty::Instance<'tcx>,
fn_abi: &FnAbi<'tcx, Ty<'tcx>>,
args: &[OperandRef<'tcx, Bx::Value>],
llresult: Bx::Value,
span: Span,
) {
let callee_ty = instance.ty(bx.tcx(), ty::ParamEnv::reveal_all());
let (def_id, substs) = match *callee_ty.kind() {
ty::FnDef(def_id, substs) => (def_id, substs),
_ => bug!("expected fn item type, found {}", callee_ty),
};
let sig = callee_ty.fn_sig(bx.tcx());
let sig = bx.tcx().normalize_erasing_late_bound_regions(ty::ParamEnv::reveal_all(), &sig);
let arg_tys = sig.inputs();
let ret_ty = sig.output();
let name = bx.tcx().item_name(def_id);
let name_str = &*name.as_str();
let llret_ty = bx.backend_type(bx.layout_of(ret_ty));
let result = PlaceRef::new_sized(llresult, fn_abi.ret.layout);
let llval = match name {
sym::assume => {
bx.assume(args[0].immediate());
return;
}
sym::abort => {
bx.abort();
return;
}
sym::unreachable => {
return;
}
sym::va_start => bx.va_start(args[0].immediate()),
sym::va_end => bx.va_end(args[0].immediate()),
sym::size_of_val => {
let tp_ty = substs.type_at(0);
if let OperandValue::Pair(_, meta) = args[0].val {
let (llsize, _) = glue::size_and_align_of_dst(bx, tp_ty, Some(meta));
llsize
} else {
bx.const_usize(bx.layout_of(tp_ty).size.bytes())
}
}
sym::min_align_of_val => {
let tp_ty = substs.type_at(0);
if let OperandValue::Pair(_, meta) = args[0].val {
let (_, llalign) = glue::size_and_align_of_dst(bx, tp_ty, Some(meta));
llalign
} else {
bx.const_usize(bx.layout_of(tp_ty).align.abi.bytes())
}
}
sym::size_of
| sym::pref_align_of
| sym::min_align_of
| sym::needs_drop
| sym::type_id
| sym::type_name
| sym::variant_count => {
let value = bx
.tcx()
.const_eval_instance(ty::ParamEnv::reveal_all(), instance, None)
.unwrap();
OperandRef::from_const(bx, value, ret_ty).immediate_or_packed_pair(bx)
}
// Effectively no-op
sym::forget => {
return;
}
sym::offset => {
let ptr = args[0].immediate();
let offset = args[1].immediate();
bx.inbounds_gep(ptr, &[offset])
}
sym::arith_offset => {
let ptr = args[0].immediate();
let offset = args[1].immediate();
bx.gep(ptr, &[offset])
}
sym::copy_nonoverlapping => {
copy_intrinsic(
bx,
false,
false,
substs.type_at(0),
args[1].immediate(),
args[0].immediate(),
args[2].immediate(),
);
return;
}
sym::copy => {
copy_intrinsic(
bx,
true,
false,
substs.type_at(0),
args[1].immediate(),
args[0].immediate(),
args[2].immediate(),
);
return;
}
sym::write_bytes => {
memset_intrinsic(
bx,
false,
substs.type_at(0),
args[0].immediate(),
args[1].immediate(),
args[2].immediate(),
);
return;
}
sym::volatile_copy_nonoverlapping_memory => {
copy_intrinsic(
bx,
false,
true,
substs.type_at(0),
args[0].immediate(),
args[1].immediate(),
args[2].immediate(),
);
return;
}
sym::volatile_copy_memory => {
copy_intrinsic(
bx,
true,
true,
substs.type_at(0),
args[0].immediate(),
args[1].immediate(),
args[2].immediate(),
);
return;
}
sym::volatile_set_memory => {
memset_intrinsic(
bx,
true,
substs.type_at(0),
args[0].immediate(),
args[1].immediate(),
args[2].immediate(),
);
return;
}
sym::volatile_store => {
let dst = args[0].deref(bx.cx());
args[1].val.volatile_store(bx, dst);
return;
}
sym::unaligned_volatile_store => {
let dst = args[0].deref(bx.cx());
args[1].val.unaligned_volatile_store(bx, dst);
return;
}
sym::add_with_overflow
| sym::sub_with_overflow
| sym::mul_with_overflow
| sym::wrapping_add
| sym::wrapping_sub
| sym::wrapping_mul
| sym::unchecked_div
| sym::unchecked_rem
| sym::unchecked_shl
| sym::unchecked_shr
| sym::unchecked_add
| sym::unchecked_sub
| sym::unchecked_mul
| sym::exact_div => {
let ty = arg_tys[0];
match int_type_width_signed(ty, bx.tcx()) {
Some((_width, signed)) => match name {
sym::add_with_overflow
| sym::sub_with_overflow
| sym::mul_with_overflow => {
let op = match name {
sym::add_with_overflow => OverflowOp::Add,
sym::sub_with_overflow => OverflowOp::Sub,
sym::mul_with_overflow => OverflowOp::Mul,
_ => bug!(),
};
let (val, overflow) =
bx.checked_binop(op, ty, args[0].immediate(), args[1].immediate());
// Convert `i1` to a `bool`, and write it to the out parameter
let val = bx.from_immediate(val);
let overflow = bx.from_immediate(overflow);
let dest = result.project_field(bx, 0);
bx.store(val, dest.llval, dest.align);
let dest = result.project_field(bx, 1);
bx.store(overflow, dest.llval, dest.align);
return;
}
sym::wrapping_add => bx.add(args[0].immediate(), args[1].immediate()),
sym::wrapping_sub => bx.sub(args[0].immediate(), args[1].immediate()),
sym::wrapping_mul => bx.mul(args[0].immediate(), args[1].immediate()),
sym::exact_div => {
if signed {
bx.exactsdiv(args[0].immediate(), args[1].immediate())
} else {
bx.exactudiv(args[0].immediate(), args[1].immediate())
}
}
sym::unchecked_div => {
if signed {
bx.sdiv(args[0].immediate(), args[1].immediate())
} else {
bx.udiv(args[0].immediate(), args[1].immediate())
}
}
sym::unchecked_rem => {
if signed {
bx.srem(args[0].immediate(), args[1].immediate())
} else {
bx.urem(args[0].immediate(), args[1].immediate())
}
}
sym::unchecked_shl => bx.shl(args[0].immediate(), args[1].immediate()),
sym::unchecked_shr => {
if signed {
bx.ashr(args[0].immediate(), args[1].immediate())
} else {
bx.lshr(args[0].immediate(), args[1].immediate())
}
}
sym::unchecked_add => {
if signed {
bx.unchecked_sadd(args[0].immediate(), args[1].immediate())
} else {
bx.unchecked_uadd(args[0].immediate(), args[1].immediate())
}
}
sym::unchecked_sub => {
if signed {
bx.unchecked_ssub(args[0].immediate(), args[1].immediate())
} else {
bx.unchecked_usub(args[0].immediate(), args[1].immediate())
}
}
sym::unchecked_mul => {
if signed {
bx.unchecked_smul(args[0].immediate(), args[1].immediate())
} else {
bx.unchecked_umul(args[0].immediate(), args[1].immediate())
}
}
_ => bug!(),
},
None => {
span_invalid_monomorphization_error(
bx.tcx().sess,
span,
&format!(
"invalid monomorphization of `{}` intrinsic: \
expected basic integer type, found `{}`",
name, ty
),
);
return;
}
}
}
sym::fadd_fast | sym::fsub_fast | sym::fmul_fast | sym::fdiv_fast | sym::frem_fast => {
match float_type_width(arg_tys[0]) {
Some(_width) => match name {
sym::fadd_fast => bx.fadd_fast(args[0].immediate(), args[1].immediate()),
sym::fsub_fast => bx.fsub_fast(args[0].immediate(), args[1].immediate()),
sym::fmul_fast => bx.fmul_fast(args[0].immediate(), args[1].immediate()),
sym::fdiv_fast => bx.fdiv_fast(args[0].immediate(), args[1].immediate()),
sym::frem_fast => bx.frem_fast(args[0].immediate(), args[1].immediate()),
_ => bug!(),
},
None => {
span_invalid_monomorphization_error(
bx.tcx().sess,
span,
&format!(
"invalid monomorphization of `{}` intrinsic: \
expected basic float type, found `{}`",
name, arg_tys[0]
),
);
return;
}
}
}
sym::float_to_int_unchecked => {
if float_type_width(arg_tys[0]).is_none() {
span_invalid_monomorphization_error(
bx.tcx().sess,
span,
&format!(
"invalid monomorphization of `float_to_int_unchecked` \
intrinsic: expected basic float type, \
found `{}`",
arg_tys[0]
),
);
return;
}
let (_width, signed) = match int_type_width_signed(ret_ty, bx.tcx()) {
Some(pair) => pair,
None => {
span_invalid_monomorphization_error(
bx.tcx().sess,
span,
&format!(
"invalid monomorphization of `float_to_int_unchecked` \
intrinsic: expected basic integer type, \
found `{}`",
ret_ty
),
);
return;
}
};
if signed {
bx.fptosi(args[0].immediate(), llret_ty)
} else {
bx.fptoui(args[0].immediate(), llret_ty)
}
}
sym::discriminant_value => {
if ret_ty.is_integral() {
args[0].deref(bx.cx()).codegen_get_discr(bx, ret_ty)
} else {
span_bug!(span, "Invalid discriminant type for `{:?}`", arg_tys[0])
}
}
// This requires that atomic intrinsics follow a specific naming pattern:
// "atomic_<operation>[_<ordering>]", and no ordering means SeqCst
name if name_str.starts_with("atomic_") => {
use crate::common::AtomicOrdering::*;
use crate::common::{AtomicRmwBinOp, SynchronizationScope};
let split: Vec<&str> = name_str.split('_').collect();
let is_cxchg = split[1] == "cxchg" || split[1] == "cxchgweak";
let (order, failorder) = match split.len() {
2 => (SequentiallyConsistent, SequentiallyConsistent),
3 => match split[2] {
"unordered" => (Unordered, Unordered),
"relaxed" => (Monotonic, Monotonic),
"acq" => (Acquire, Acquire),
"rel" => (Release, Monotonic),
"acqrel" => (AcquireRelease, Acquire),
"failrelaxed" if is_cxchg => (SequentiallyConsistent, Monotonic),
"failacq" if is_cxchg => (SequentiallyConsistent, Acquire),
_ => bx.sess().fatal("unknown ordering in atomic intrinsic"),
},
4 => match (split[2], split[3]) {
("acq", "failrelaxed") if is_cxchg => (Acquire, Monotonic),
("acqrel", "failrelaxed") if is_cxchg => (AcquireRelease, Monotonic),
_ => bx.sess().fatal("unknown ordering in atomic intrinsic"),
},
_ => bx.sess().fatal("Atomic intrinsic not in correct format"),
};
let invalid_monomorphization = |ty| {
span_invalid_monomorphization_error(
bx.tcx().sess,
span,
&format!(
"invalid monomorphization of `{}` intrinsic: \
expected basic integer type, found `{}`",
name, ty
),
);
};
match split[1] {
"cxchg" | "cxchgweak" => {
let ty = substs.type_at(0);
if int_type_width_signed(ty, bx.tcx()).is_some() {
let weak = split[1] == "cxchgweak";
let pair = bx.atomic_cmpxchg(
args[0].immediate(),
args[1].immediate(),
args[2].immediate(),
order,
failorder,
weak,
);
let val = bx.extract_value(pair, 0);
let success = bx.extract_value(pair, 1);
let val = bx.from_immediate(val);
let success = bx.from_immediate(success);
let dest = result.project_field(bx, 0);
bx.store(val, dest.llval, dest.align);
let dest = result.project_field(bx, 1);
bx.store(success, dest.llval, dest.align);
return;
} else {
return invalid_monomorphization(ty);
}
}
"load" => {
let ty = substs.type_at(0);
if int_type_width_signed(ty, bx.tcx()).is_some() {
let size = bx.layout_of(ty).size;
bx.atomic_load(args[0].immediate(), order, size)
} else {
return invalid_monomorphization(ty);
}
}
"store" => {
let ty = substs.type_at(0);
if int_type_width_signed(ty, bx.tcx()).is_some() {
let size = bx.layout_of(ty).size;
bx.atomic_store(args[1].immediate(), args[0].immediate(), order, size);
return;
} else {
return invalid_monomorphization(ty);
}
}
"fence" => {
bx.atomic_fence(order, SynchronizationScope::CrossThread);
return;
}
"singlethreadfence" => {
bx.atomic_fence(order, SynchronizationScope::SingleThread);
return;
}
// These are all AtomicRMW ops
op => {
let atom_op = match op {
"xchg" => AtomicRmwBinOp::AtomicXchg,
"xadd" => AtomicRmwBinOp::AtomicAdd,
"xsub" => AtomicRmwBinOp::AtomicSub,
"and" => AtomicRmwBinOp::AtomicAnd,
"nand" => AtomicRmwBinOp::AtomicNand,
"or" => AtomicRmwBinOp::AtomicOr,
"xor" => AtomicRmwBinOp::AtomicXor,
"max" => AtomicRmwBinOp::AtomicMax,
"min" => AtomicRmwBinOp::AtomicMin,
"umax" => AtomicRmwBinOp::AtomicUMax,
"umin" => AtomicRmwBinOp::AtomicUMin,
_ => bx.sess().fatal("unknown atomic operation"),
};
let ty = substs.type_at(0);
if int_type_width_signed(ty, bx.tcx()).is_some() {
bx.atomic_rmw(atom_op, args[0].immediate(), args[1].immediate(), order)
} else {
return invalid_monomorphization(ty);
}
}
}
}
sym::nontemporal_store => {
let dst = args[0].deref(bx.cx());
args[1].val.nontemporal_store(bx, dst);
return;
}
sym::ptr_guaranteed_eq | sym::ptr_guaranteed_ne => {
let a = args[0].immediate();
let b = args[1].immediate();
if name == sym::ptr_guaranteed_eq {
bx.icmp(IntPredicate::IntEQ, a, b)
} else {
bx.icmp(IntPredicate::IntNE, a, b)
}
}
sym::ptr_offset_from => {
let ty = substs.type_at(0);
let pointee_size = bx.layout_of(ty).size;
// This is the same sequence that Clang emits for pointer subtraction.
// It can be neither `nsw` nor `nuw` because the input is treated as
// unsigned but then the output is treated as signed, so neither works.
let a = args[0].immediate();
let b = args[1].immediate();
let a = bx.ptrtoint(a, bx.type_isize());
let b = bx.ptrtoint(b, bx.type_isize());
let d = bx.sub(a, b);
let pointee_size = bx.const_usize(pointee_size.bytes());
// this is where the signed magic happens (notice the `s` in `exactsdiv`)
bx.exactsdiv(d, pointee_size)
}
_ => {
// Need to use backend-specific things in the implementation.
bx.codegen_intrinsic_call(instance, fn_abi, args, llresult, span);
return;
}
};
if !fn_abi.ret.is_ignore() {
if let PassMode::Cast(ty) = fn_abi.ret.mode {
let ptr_llty = bx.type_ptr_to(bx.cast_backend_type(&ty));
let ptr = bx.pointercast(result.llval, ptr_llty);
bx.store(llval, ptr, result.align);
} else {
OperandRef::from_immediate_or_packed_pair(bx, llval, result.layout)
.val
.store(bx, result);
}
}
}
}
// Returns the width of an int Ty, and if it's signed or not
// Returns None if the type is not an integer
// FIXME: there’s multiple of this functions, investigate using some of the already existing
// stuffs.
fn int_type_width_signed(ty: Ty<'_>, tcx: TyCtxt<'_>) -> Option<(u64, bool)> {
match ty.kind() {
ty::Int(t) => Some((t.bit_width().unwrap_or(u64::from(tcx.sess.target.ptr_width)), true)),
ty::Uint(t) => Some((t.bit_width().unwrap_or(u64::from(tcx.sess.target.ptr_width)), false)),
_ => None,
}
}
// Returns the width of a float Ty
// Returns None if the type is not a float
fn float_type_width(ty: Ty<'_>) -> Option<u64> {
match ty.kind() {
ty::Float(t) => Some(t.bit_width()),
_ => None,
}
}

1
compiler/rustc_codegen_ssa/src/mir/mod.rs
View File

@ -486,6 +486,7 @@ mod block;
pub mod constant;
pub mod coverageinfo;
pub mod debuginfo;
mod intrinsic;
pub mod operand;
pub mod place;
mod rvalue;