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simd.rs
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simd.rs
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//! Codegen `extern "platform-intrinsic"` intrinsics.
use rustc_middle::ty::GenericArgsRef;
use rustc_span::Symbol;
use rustc_target::abi::Endian;
use super::*;
use crate::prelude::*;
fn report_simd_type_validation_error(
fx: &mut FunctionCx<'_, '_, '_>,
intrinsic: Symbol,
span: Span,
ty: Ty<'_>,
) {
fx.tcx.sess.span_err(span, format!("invalid monomorphization of `{}` intrinsic: expected SIMD input type, found non-SIMD `{}`", intrinsic, ty));
// Prevent verifier error
fx.bcx.ins().trap(TrapCode::UnreachableCodeReached);
}
pub(super) fn codegen_simd_intrinsic_call<'tcx>(
fx: &mut FunctionCx<'_, '_, 'tcx>,
intrinsic: Symbol,
_args: GenericArgsRef<'tcx>,
args: &[mir::Operand<'tcx>],
ret: CPlace<'tcx>,
target: BasicBlock,
span: Span,
) {
match intrinsic {
sym::simd_as | sym::simd_cast => {
intrinsic_args!(fx, args => (a); intrinsic);
if !a.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, a.layout().ty);
return;
}
simd_for_each_lane(fx, a, ret, &|fx, lane_ty, ret_lane_ty, lane| {
let ret_lane_clif_ty = fx.clif_type(ret_lane_ty).unwrap();
let from_signed = type_sign(lane_ty);
let to_signed = type_sign(ret_lane_ty);
clif_int_or_float_cast(fx, lane, from_signed, ret_lane_clif_ty, to_signed)
});
}
sym::simd_eq | sym::simd_ne | sym::simd_lt | sym::simd_le | sym::simd_gt | sym::simd_ge => {
intrinsic_args!(fx, args => (x, y); intrinsic);
if !x.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, x.layout().ty);
return;
}
// FIXME use vector instructions when possible
simd_pair_for_each_lane(fx, x, y, ret, &|fx, lane_ty, res_lane_ty, x_lane, y_lane| {
let res_lane = match (lane_ty.kind(), intrinsic) {
(ty::Uint(_), sym::simd_eq) => fx.bcx.ins().icmp(IntCC::Equal, x_lane, y_lane),
(ty::Uint(_), sym::simd_ne) => {
fx.bcx.ins().icmp(IntCC::NotEqual, x_lane, y_lane)
}
(ty::Uint(_), sym::simd_lt) => {
fx.bcx.ins().icmp(IntCC::UnsignedLessThan, x_lane, y_lane)
}
(ty::Uint(_), sym::simd_le) => {
fx.bcx.ins().icmp(IntCC::UnsignedLessThanOrEqual, x_lane, y_lane)
}
(ty::Uint(_), sym::simd_gt) => {
fx.bcx.ins().icmp(IntCC::UnsignedGreaterThan, x_lane, y_lane)
}
(ty::Uint(_), sym::simd_ge) => {
fx.bcx.ins().icmp(IntCC::UnsignedGreaterThanOrEqual, x_lane, y_lane)
}
(ty::Int(_), sym::simd_eq) => fx.bcx.ins().icmp(IntCC::Equal, x_lane, y_lane),
(ty::Int(_), sym::simd_ne) => {
fx.bcx.ins().icmp(IntCC::NotEqual, x_lane, y_lane)
}
(ty::Int(_), sym::simd_lt) => {
fx.bcx.ins().icmp(IntCC::SignedLessThan, x_lane, y_lane)
}
(ty::Int(_), sym::simd_le) => {
fx.bcx.ins().icmp(IntCC::SignedLessThanOrEqual, x_lane, y_lane)
}
(ty::Int(_), sym::simd_gt) => {
fx.bcx.ins().icmp(IntCC::SignedGreaterThan, x_lane, y_lane)
}
(ty::Int(_), sym::simd_ge) => {
fx.bcx.ins().icmp(IntCC::SignedGreaterThanOrEqual, x_lane, y_lane)
}
(ty::Float(_), sym::simd_eq) => {
fx.bcx.ins().fcmp(FloatCC::Equal, x_lane, y_lane)
}
(ty::Float(_), sym::simd_ne) => {
fx.bcx.ins().fcmp(FloatCC::NotEqual, x_lane, y_lane)
}
(ty::Float(_), sym::simd_lt) => {
fx.bcx.ins().fcmp(FloatCC::LessThan, x_lane, y_lane)
}
(ty::Float(_), sym::simd_le) => {
fx.bcx.ins().fcmp(FloatCC::LessThanOrEqual, x_lane, y_lane)
}
(ty::Float(_), sym::simd_gt) => {
fx.bcx.ins().fcmp(FloatCC::GreaterThan, x_lane, y_lane)
}
(ty::Float(_), sym::simd_ge) => {
fx.bcx.ins().fcmp(FloatCC::GreaterThanOrEqual, x_lane, y_lane)
}
_ => unreachable!(),
};
bool_to_zero_or_max_uint(fx, res_lane_ty, res_lane)
});
}
// simd_shuffle<T, I, U>(x: T, y: T, idx: I) -> U
sym::simd_shuffle => {
let (x, y, idx) = match args {
[x, y, idx] => (x, y, idx),
_ => {
bug!("wrong number of args for intrinsic {intrinsic}");
}
};
let x = codegen_operand(fx, x);
let y = codegen_operand(fx, y);
if !x.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, x.layout().ty);
return;
}
// Make sure this is actually an array, since typeck only checks the length-suffixed
// version of this intrinsic.
let idx_ty = fx.monomorphize(idx.ty(fx.mir, fx.tcx));
let n: u16 = match idx_ty.kind() {
ty::Array(ty, len) if matches!(ty.kind(), ty::Uint(ty::UintTy::U32)) => len
.try_eval_target_usize(fx.tcx, ty::ParamEnv::reveal_all())
.unwrap_or_else(|| {
span_bug!(span, "could not evaluate shuffle index array length")
})
.try_into()
.unwrap(),
_ => {
fx.tcx.sess.span_err(
span,
format!("simd_shuffle index must be an array of `u32`, got `{}`", idx_ty),
);
// Prevent verifier error
fx.bcx.ins().trap(TrapCode::UnreachableCodeReached);
return;
}
};
assert_eq!(x.layout(), y.layout());
let layout = x.layout();
let (lane_count, lane_ty) = layout.ty.simd_size_and_type(fx.tcx);
let (ret_lane_count, ret_lane_ty) = ret.layout().ty.simd_size_and_type(fx.tcx);
assert_eq!(lane_ty, ret_lane_ty);
assert_eq!(u64::from(n), ret_lane_count);
let total_len = lane_count * 2;
let indexes = {
use rustc_middle::mir::interpret::*;
let idx_const = crate::constant::mir_operand_get_const_val(fx, idx)
.expect("simd_shuffle idx not const");
let idx_bytes = match idx_const {
ConstValue::ByRef { alloc, offset } => {
let size = Size::from_bytes(
4 * ret_lane_count, /* size_of([u32; ret_lane_count]) */
);
alloc
.inner()
.get_bytes_strip_provenance(fx, alloc_range(offset, size))
.unwrap()
}
_ => unreachable!("{:?}", idx_const),
};
(0..ret_lane_count)
.map(|i| {
let i = usize::try_from(i).unwrap();
let idx = rustc_middle::mir::interpret::read_target_uint(
fx.tcx.data_layout.endian,
&idx_bytes[4 * i..4 * i + 4],
)
.expect("read_target_uint");
u16::try_from(idx).expect("try_from u32")
})
.collect::<Vec<u16>>()
};
for &idx in &indexes {
assert!(u64::from(idx) < total_len, "idx {} out of range 0..{}", idx, total_len);
}
for (out_idx, in_idx) in indexes.into_iter().enumerate() {
let in_lane = if u64::from(in_idx) < lane_count {
x.value_lane(fx, in_idx.into())
} else {
y.value_lane(fx, u64::from(in_idx) - lane_count)
};
let out_lane = ret.place_lane(fx, u64::try_from(out_idx).unwrap());
out_lane.write_cvalue(fx, in_lane);
}
}
sym::simd_insert => {
let (base, idx, val) = match args {
[base, idx, val] => (base, idx, val),
_ => {
bug!("wrong number of args for intrinsic {intrinsic}");
}
};
let base = codegen_operand(fx, base);
let val = codegen_operand(fx, val);
// FIXME validate
let idx_const = if let Some(idx_const) =
crate::constant::mir_operand_get_const_val(fx, idx)
{
idx_const
} else {
fx.tcx.sess.span_fatal(span, "Index argument for `simd_insert` is not a constant");
};
let idx = idx_const
.try_to_bits(Size::from_bytes(4 /* u32*/))
.unwrap_or_else(|| panic!("kind not scalar: {:?}", idx_const));
let (lane_count, _lane_ty) = base.layout().ty.simd_size_and_type(fx.tcx);
if idx >= lane_count.into() {
fx.tcx.sess.span_fatal(
fx.mir.span,
format!("[simd_insert] idx {} >= lane_count {}", idx, lane_count),
);
}
ret.write_cvalue(fx, base);
let ret_lane = ret.place_lane(fx, idx.try_into().unwrap());
ret_lane.write_cvalue(fx, val);
}
sym::simd_extract => {
let (v, idx) = match args {
[v, idx] => (v, idx),
_ => {
bug!("wrong number of args for intrinsic {intrinsic}");
}
};
let v = codegen_operand(fx, v);
if !v.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
return;
}
let idx_const = if let Some(idx_const) =
crate::constant::mir_operand_get_const_val(fx, idx)
{
idx_const
} else {
fx.tcx.sess.span_warn(span, "Index argument for `simd_extract` is not a constant");
let trap_block = fx.bcx.create_block();
let true_ = fx.bcx.ins().iconst(types::I8, 1);
let ret_block = fx.get_block(target);
fx.bcx.ins().brif(true_, trap_block, &[], ret_block, &[]);
fx.bcx.switch_to_block(trap_block);
crate::trap::trap_unimplemented(
fx,
"Index argument for `simd_extract` is not a constant",
);
return;
};
let idx = idx_const
.try_to_bits(Size::from_bytes(4 /* u32*/))
.unwrap_or_else(|| panic!("kind not scalar: {:?}", idx_const));
let (lane_count, _lane_ty) = v.layout().ty.simd_size_and_type(fx.tcx);
if idx >= lane_count.into() {
fx.tcx.sess.span_fatal(
fx.mir.span,
format!("[simd_extract] idx {} >= lane_count {}", idx, lane_count),
);
}
let ret_lane = v.value_lane(fx, idx.try_into().unwrap());
ret.write_cvalue(fx, ret_lane);
}
sym::simd_neg => {
intrinsic_args!(fx, args => (a); intrinsic);
if !a.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, a.layout().ty);
return;
}
simd_for_each_lane(
fx,
a,
ret,
&|fx, lane_ty, _ret_lane_ty, lane| match lane_ty.kind() {
ty::Int(_) => fx.bcx.ins().ineg(lane),
ty::Float(_) => fx.bcx.ins().fneg(lane),
_ => unreachable!(),
},
);
}
sym::simd_add
| sym::simd_sub
| sym::simd_mul
| sym::simd_div
| sym::simd_rem
| sym::simd_shl
| sym::simd_shr
| sym::simd_and
| sym::simd_or
| sym::simd_xor => {
intrinsic_args!(fx, args => (x, y); intrinsic);
// FIXME use vector instructions when possible
simd_pair_for_each_lane(fx, x, y, ret, &|fx, lane_ty, _ret_lane_ty, x_lane, y_lane| {
match (lane_ty.kind(), intrinsic) {
(ty::Uint(_), sym::simd_add) => fx.bcx.ins().iadd(x_lane, y_lane),
(ty::Uint(_), sym::simd_sub) => fx.bcx.ins().isub(x_lane, y_lane),
(ty::Uint(_), sym::simd_mul) => fx.bcx.ins().imul(x_lane, y_lane),
(ty::Uint(_), sym::simd_div) => fx.bcx.ins().udiv(x_lane, y_lane),
(ty::Uint(_), sym::simd_rem) => fx.bcx.ins().urem(x_lane, y_lane),
(ty::Int(_), sym::simd_add) => fx.bcx.ins().iadd(x_lane, y_lane),
(ty::Int(_), sym::simd_sub) => fx.bcx.ins().isub(x_lane, y_lane),
(ty::Int(_), sym::simd_mul) => fx.bcx.ins().imul(x_lane, y_lane),
(ty::Int(_), sym::simd_div) => fx.bcx.ins().sdiv(x_lane, y_lane),
(ty::Int(_), sym::simd_rem) => fx.bcx.ins().srem(x_lane, y_lane),
(ty::Float(_), sym::simd_add) => fx.bcx.ins().fadd(x_lane, y_lane),
(ty::Float(_), sym::simd_sub) => fx.bcx.ins().fsub(x_lane, y_lane),
(ty::Float(_), sym::simd_mul) => fx.bcx.ins().fmul(x_lane, y_lane),
(ty::Float(_), sym::simd_div) => fx.bcx.ins().fdiv(x_lane, y_lane),
(ty::Float(FloatTy::F32), sym::simd_rem) => fx.lib_call(
"fmodf",
vec![AbiParam::new(types::F32), AbiParam::new(types::F32)],
vec![AbiParam::new(types::F32)],
&[x_lane, y_lane],
)[0],
(ty::Float(FloatTy::F64), sym::simd_rem) => fx.lib_call(
"fmod",
vec![AbiParam::new(types::F64), AbiParam::new(types::F64)],
vec![AbiParam::new(types::F64)],
&[x_lane, y_lane],
)[0],
(ty::Uint(_), sym::simd_shl) => fx.bcx.ins().ishl(x_lane, y_lane),
(ty::Uint(_), sym::simd_shr) => fx.bcx.ins().ushr(x_lane, y_lane),
(ty::Uint(_), sym::simd_and) => fx.bcx.ins().band(x_lane, y_lane),
(ty::Uint(_), sym::simd_or) => fx.bcx.ins().bor(x_lane, y_lane),
(ty::Uint(_), sym::simd_xor) => fx.bcx.ins().bxor(x_lane, y_lane),
(ty::Int(_), sym::simd_shl) => fx.bcx.ins().ishl(x_lane, y_lane),
(ty::Int(_), sym::simd_shr) => fx.bcx.ins().sshr(x_lane, y_lane),
(ty::Int(_), sym::simd_and) => fx.bcx.ins().band(x_lane, y_lane),
(ty::Int(_), sym::simd_or) => fx.bcx.ins().bor(x_lane, y_lane),
(ty::Int(_), sym::simd_xor) => fx.bcx.ins().bxor(x_lane, y_lane),
_ => unreachable!(),
}
});
}
sym::simd_fma => {
intrinsic_args!(fx, args => (a, b, c); intrinsic);
if !a.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, a.layout().ty);
return;
}
assert_eq!(a.layout(), b.layout());
assert_eq!(a.layout(), c.layout());
assert_eq!(a.layout(), ret.layout());
let layout = a.layout();
let (lane_count, lane_ty) = layout.ty.simd_size_and_type(fx.tcx);
let res_lane_layout = fx.layout_of(lane_ty);
for lane in 0..lane_count {
let a_lane = a.value_lane(fx, lane).load_scalar(fx);
let b_lane = b.value_lane(fx, lane).load_scalar(fx);
let c_lane = c.value_lane(fx, lane).load_scalar(fx);
let res_lane = fx.bcx.ins().fma(a_lane, b_lane, c_lane);
let res_lane = CValue::by_val(res_lane, res_lane_layout);
ret.place_lane(fx, lane).write_cvalue(fx, res_lane);
}
}
sym::simd_fmin | sym::simd_fmax => {
intrinsic_args!(fx, args => (x, y); intrinsic);
if !x.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, x.layout().ty);
return;
}
// FIXME use vector instructions when possible
simd_pair_for_each_lane(fx, x, y, ret, &|fx, lane_ty, _ret_lane_ty, x_lane, y_lane| {
match lane_ty.kind() {
ty::Float(_) => {}
_ => unreachable!("{:?}", lane_ty),
}
match intrinsic {
sym::simd_fmin => crate::num::codegen_float_min(fx, x_lane, y_lane),
sym::simd_fmax => crate::num::codegen_float_max(fx, x_lane, y_lane),
_ => unreachable!(),
}
});
}
sym::simd_fpow => {
intrinsic_args!(fx, args => (a, b); intrinsic);
if !a.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, a.layout().ty);
return;
}
simd_pair_for_each_lane(fx, a, b, ret, &|fx, lane_ty, _ret_lane_ty, a_lane, b_lane| {
match lane_ty.kind() {
ty::Float(FloatTy::F32) => fx.lib_call(
"powf",
vec![AbiParam::new(types::F32), AbiParam::new(types::F32)],
vec![AbiParam::new(types::F32)],
&[a_lane, b_lane],
)[0],
ty::Float(FloatTy::F64) => fx.lib_call(
"pow",
vec![AbiParam::new(types::F64), AbiParam::new(types::F64)],
vec![AbiParam::new(types::F64)],
&[a_lane, b_lane],
)[0],
_ => unreachable!("{:?}", lane_ty),
}
});
}
sym::simd_fpowi => {
intrinsic_args!(fx, args => (a, exp); intrinsic);
let exp = exp.load_scalar(fx);
if !a.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, a.layout().ty);
return;
}
simd_for_each_lane(
fx,
a,
ret,
&|fx, lane_ty, _ret_lane_ty, lane| match lane_ty.kind() {
ty::Float(FloatTy::F32) => fx.lib_call(
"__powisf2", // compiler-builtins
vec![AbiParam::new(types::F32), AbiParam::new(types::I32)],
vec![AbiParam::new(types::F32)],
&[lane, exp],
)[0],
ty::Float(FloatTy::F64) => fx.lib_call(
"__powidf2", // compiler-builtins
vec![AbiParam::new(types::F64), AbiParam::new(types::I32)],
vec![AbiParam::new(types::F64)],
&[lane, exp],
)[0],
_ => unreachable!("{:?}", lane_ty),
},
);
}
sym::simd_fsin
| sym::simd_fcos
| sym::simd_fexp
| sym::simd_fexp2
| sym::simd_flog
| sym::simd_flog10
| sym::simd_flog2
| sym::simd_round => {
intrinsic_args!(fx, args => (a); intrinsic);
if !a.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, a.layout().ty);
return;
}
simd_for_each_lane(fx, a, ret, &|fx, lane_ty, _ret_lane_ty, lane| {
let lane_ty = match lane_ty.kind() {
ty::Float(FloatTy::F32) => types::F32,
ty::Float(FloatTy::F64) => types::F64,
_ => unreachable!("{:?}", lane_ty),
};
let name = match (intrinsic, lane_ty) {
(sym::simd_fsin, types::F32) => "sinf",
(sym::simd_fsin, types::F64) => "sin",
(sym::simd_fcos, types::F32) => "cosf",
(sym::simd_fcos, types::F64) => "cos",
(sym::simd_fexp, types::F32) => "expf",
(sym::simd_fexp, types::F64) => "exp",
(sym::simd_fexp2, types::F32) => "exp2f",
(sym::simd_fexp2, types::F64) => "exp2",
(sym::simd_flog, types::F32) => "logf",
(sym::simd_flog, types::F64) => "log",
(sym::simd_flog10, types::F32) => "log10f",
(sym::simd_flog10, types::F64) => "log10",
(sym::simd_flog2, types::F32) => "log2f",
(sym::simd_flog2, types::F64) => "log2",
(sym::simd_round, types::F32) => "roundf",
(sym::simd_round, types::F64) => "round",
_ => unreachable!("{:?}", intrinsic),
};
fx.lib_call(
name,
vec![AbiParam::new(lane_ty)],
vec![AbiParam::new(lane_ty)],
&[lane],
)[0]
});
}
sym::simd_fabs | sym::simd_fsqrt | sym::simd_ceil | sym::simd_floor | sym::simd_trunc => {
intrinsic_args!(fx, args => (a); intrinsic);
if !a.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, a.layout().ty);
return;
}
simd_for_each_lane(fx, a, ret, &|fx, lane_ty, _ret_lane_ty, lane| {
match lane_ty.kind() {
ty::Float(_) => {}
_ => unreachable!("{:?}", lane_ty),
}
match intrinsic {
sym::simd_fabs => fx.bcx.ins().fabs(lane),
sym::simd_fsqrt => fx.bcx.ins().sqrt(lane),
sym::simd_ceil => fx.bcx.ins().ceil(lane),
sym::simd_floor => fx.bcx.ins().floor(lane),
sym::simd_trunc => fx.bcx.ins().trunc(lane),
_ => unreachable!(),
}
});
}
sym::simd_reduce_add_ordered => {
intrinsic_args!(fx, args => (v, acc); intrinsic);
let acc = acc.load_scalar(fx);
// FIXME there must be no acc param for integer vectors
if !v.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
return;
}
simd_reduce(fx, v, Some(acc), ret, &|fx, lane_ty, a, b| {
if lane_ty.is_floating_point() {
fx.bcx.ins().fadd(a, b)
} else {
fx.bcx.ins().iadd(a, b)
}
});
}
sym::simd_reduce_add_unordered => {
intrinsic_args!(fx, args => (v); intrinsic);
// FIXME there must be no acc param for integer vectors
if !v.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
return;
}
simd_reduce(fx, v, None, ret, &|fx, lane_ty, a, b| {
if lane_ty.is_floating_point() {
fx.bcx.ins().fadd(a, b)
} else {
fx.bcx.ins().iadd(a, b)
}
});
}
sym::simd_reduce_mul_ordered => {
intrinsic_args!(fx, args => (v, acc); intrinsic);
let acc = acc.load_scalar(fx);
// FIXME there must be no acc param for integer vectors
if !v.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
return;
}
simd_reduce(fx, v, Some(acc), ret, &|fx, lane_ty, a, b| {
if lane_ty.is_floating_point() {
fx.bcx.ins().fmul(a, b)
} else {
fx.bcx.ins().imul(a, b)
}
});
}
sym::simd_reduce_mul_unordered => {
intrinsic_args!(fx, args => (v); intrinsic);
// FIXME there must be no acc param for integer vectors
if !v.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
return;
}
simd_reduce(fx, v, None, ret, &|fx, lane_ty, a, b| {
if lane_ty.is_floating_point() {
fx.bcx.ins().fmul(a, b)
} else {
fx.bcx.ins().imul(a, b)
}
});
}
sym::simd_reduce_all => {
intrinsic_args!(fx, args => (v); intrinsic);
if !v.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
return;
}
simd_reduce_bool(fx, v, ret, &|fx, a, b| fx.bcx.ins().band(a, b));
}
sym::simd_reduce_any => {
intrinsic_args!(fx, args => (v); intrinsic);
if !v.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
return;
}
simd_reduce_bool(fx, v, ret, &|fx, a, b| fx.bcx.ins().bor(a, b));
}
sym::simd_reduce_and => {
intrinsic_args!(fx, args => (v); intrinsic);
if !v.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
return;
}
simd_reduce(fx, v, None, ret, &|fx, _ty, a, b| fx.bcx.ins().band(a, b));
}
sym::simd_reduce_or => {
intrinsic_args!(fx, args => (v); intrinsic);
if !v.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
return;
}
simd_reduce(fx, v, None, ret, &|fx, _ty, a, b| fx.bcx.ins().bor(a, b));
}
sym::simd_reduce_xor => {
intrinsic_args!(fx, args => (v); intrinsic);
if !v.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
return;
}
simd_reduce(fx, v, None, ret, &|fx, _ty, a, b| fx.bcx.ins().bxor(a, b));
}
sym::simd_reduce_min | sym::simd_reduce_min_nanless => {
intrinsic_args!(fx, args => (v); intrinsic);
if !v.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
return;
}
simd_reduce(fx, v, None, ret, &|fx, ty, a, b| {
let lt = match ty.kind() {
ty::Int(_) => fx.bcx.ins().icmp(IntCC::SignedLessThan, a, b),
ty::Uint(_) => fx.bcx.ins().icmp(IntCC::UnsignedLessThan, a, b),
ty::Float(_) => return crate::num::codegen_float_min(fx, a, b),
_ => unreachable!(),
};
fx.bcx.ins().select(lt, a, b)
});
}
sym::simd_reduce_max | sym::simd_reduce_max_nanless => {
intrinsic_args!(fx, args => (v); intrinsic);
if !v.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, v.layout().ty);
return;
}
simd_reduce(fx, v, None, ret, &|fx, ty, a, b| {
let gt = match ty.kind() {
ty::Int(_) => fx.bcx.ins().icmp(IntCC::SignedGreaterThan, a, b),
ty::Uint(_) => fx.bcx.ins().icmp(IntCC::UnsignedGreaterThan, a, b),
ty::Float(_) => return crate::num::codegen_float_max(fx, a, b),
_ => unreachable!(),
};
fx.bcx.ins().select(gt, a, b)
});
}
sym::simd_select => {
intrinsic_args!(fx, args => (m, a, b); intrinsic);
if !m.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, m.layout().ty);
return;
}
if !a.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, a.layout().ty);
return;
}
assert_eq!(a.layout(), b.layout());
let (lane_count, lane_ty) = a.layout().ty.simd_size_and_type(fx.tcx);
let lane_layout = fx.layout_of(lane_ty);
for lane in 0..lane_count {
let m_lane = m.value_lane(fx, lane).load_scalar(fx);
let a_lane = a.value_lane(fx, lane).load_scalar(fx);
let b_lane = b.value_lane(fx, lane).load_scalar(fx);
let m_lane = fx.bcx.ins().icmp_imm(IntCC::Equal, m_lane, 0);
let res_lane =
CValue::by_val(fx.bcx.ins().select(m_lane, b_lane, a_lane), lane_layout);
ret.place_lane(fx, lane).write_cvalue(fx, res_lane);
}
}
sym::simd_select_bitmask => {
intrinsic_args!(fx, args => (m, a, b); intrinsic);
if !a.layout().ty.is_simd() {
report_simd_type_validation_error(fx, intrinsic, span, a.layout().ty);
return;
}
assert_eq!(a.layout(), b.layout());
let (lane_count, lane_ty) = a.layout().ty.simd_size_and_type(fx.tcx);
let lane_layout = fx.layout_of(lane_ty);
let m = m.load_scalar(fx);
for lane in 0..lane_count {
let m_lane = fx.bcx.ins().ushr_imm(m, u64::from(lane) as i64);
let m_lane = fx.bcx.ins().band_imm(m_lane, 1);
let a_lane = a.value_lane(fx, lane).load_scalar(fx);
let b_lane = b.value_lane(fx, lane).load_scalar(fx);
let m_lane = fx.bcx.ins().icmp_imm(IntCC::Equal, m_lane, 0);
let res_lane =
CValue::by_val(fx.bcx.ins().select(m_lane, b_lane, a_lane), lane_layout);
ret.place_lane(fx, lane).write_cvalue(fx, res_lane);
}
}
sym::simd_bitmask => {
intrinsic_args!(fx, args => (a); intrinsic);
let (lane_count, lane_ty) = a.layout().ty.simd_size_and_type(fx.tcx);
let lane_clif_ty = fx.clif_type(lane_ty).unwrap();
// The `fn simd_bitmask(vector) -> unsigned integer` intrinsic takes a
// vector mask and returns the most significant bit (MSB) of each lane in the form
// of either:
// * an unsigned integer
// * an array of `u8`
// If the vector has less than 8 lanes, a u8 is returned with zeroed trailing bits.
//
// The bit order of the result depends on the byte endianness, LSB-first for little
// endian and MSB-first for big endian.
let expected_int_bits = lane_count.max(8);
let expected_bytes = expected_int_bits / 8 + ((expected_int_bits % 8 > 0) as u64);
match lane_ty.kind() {
ty::Int(_) | ty::Uint(_) => {}
_ => {
fx.tcx.sess.span_fatal(
span,
format!(
"invalid monomorphization of `simd_bitmask` intrinsic: \
vector argument `{}`'s element type `{}`, expected integer element \
type",
a.layout().ty,
lane_ty
),
);
}
}
let res_type =
Type::int_with_byte_size(u16::try_from(expected_bytes).unwrap()).unwrap();
let mut res = type_zero_value(&mut fx.bcx, res_type);
let lanes = match fx.tcx.sess.target.endian {
Endian::Big => Box::new(0..lane_count) as Box<dyn Iterator<Item = u64>>,
Endian::Little => Box::new((0..lane_count).rev()) as Box<dyn Iterator<Item = u64>>,
};
for lane in lanes {
let a_lane = a.value_lane(fx, lane).load_scalar(fx);
// extract sign bit of an int
let a_lane_sign = fx.bcx.ins().ushr_imm(a_lane, i64::from(lane_clif_ty.bits() - 1));
// shift sign bit into result
let a_lane_sign = clif_intcast(fx, a_lane_sign, res_type, false);
res = fx.bcx.ins().ishl_imm(res, 1);
res = fx.bcx.ins().bor(res, a_lane_sign);
}
match ret.layout().ty.kind() {
ty::Uint(i) if i.bit_width() == Some(expected_int_bits) => {}
ty::Array(elem, len)
if matches!(elem.kind(), ty::Uint(ty::UintTy::U8))
&& len.try_eval_target_usize(fx.tcx, ty::ParamEnv::reveal_all())
== Some(expected_bytes) => {}
_ => {
fx.tcx.sess.span_fatal(
span,
format!(
"invalid monomorphization of `simd_bitmask` intrinsic: \
cannot return `{}`, expected `u{}` or `[u8; {}]`",
ret.layout().ty,
expected_int_bits,
expected_bytes
),
);
}
}
let res = CValue::by_val(res, ret.layout());
ret.write_cvalue(fx, res);
}
sym::simd_saturating_add | sym::simd_saturating_sub => {
intrinsic_args!(fx, args => (x, y); intrinsic);
let bin_op = match intrinsic {
sym::simd_saturating_add => BinOp::Add,
sym::simd_saturating_sub => BinOp::Sub,
_ => unreachable!(),
};
// FIXME use vector instructions when possible
simd_pair_for_each_lane_typed(fx, x, y, ret, &|fx, x_lane, y_lane| {
crate::num::codegen_saturating_int_binop(fx, bin_op, x_lane, y_lane)
});
}
sym::simd_expose_addr | sym::simd_from_exposed_addr | sym::simd_cast_ptr => {
intrinsic_args!(fx, args => (arg); intrinsic);
ret.write_cvalue_transmute(fx, arg);
}
sym::simd_arith_offset => {
intrinsic_args!(fx, args => (ptr, offset); intrinsic);
let (lane_count, ptr_lane_ty) = ptr.layout().ty.simd_size_and_type(fx.tcx);
let pointee_ty = ptr_lane_ty.builtin_deref(true).unwrap().ty;
let pointee_size = fx.layout_of(pointee_ty).size.bytes();
let (ret_lane_count, ret_lane_ty) = ret.layout().ty.simd_size_and_type(fx.tcx);
let ret_lane_layout = fx.layout_of(ret_lane_ty);
assert_eq!(lane_count, ret_lane_count);
for lane_idx in 0..lane_count {
let ptr_lane = ptr.value_lane(fx, lane_idx).load_scalar(fx);
let offset_lane = offset.value_lane(fx, lane_idx).load_scalar(fx);
let ptr_diff = if pointee_size != 1 {
fx.bcx.ins().imul_imm(offset_lane, pointee_size as i64)
} else {
offset_lane
};
let res_lane = fx.bcx.ins().iadd(ptr_lane, ptr_diff);
let res_lane = CValue::by_val(res_lane, ret_lane_layout);
ret.place_lane(fx, lane_idx).write_cvalue(fx, res_lane);
}
}
sym::simd_gather => {
intrinsic_args!(fx, args => (val, ptr, mask); intrinsic);
let (val_lane_count, val_lane_ty) = val.layout().ty.simd_size_and_type(fx.tcx);
let (ptr_lane_count, _ptr_lane_ty) = ptr.layout().ty.simd_size_and_type(fx.tcx);
let (mask_lane_count, _mask_lane_ty) = mask.layout().ty.simd_size_and_type(fx.tcx);
let (ret_lane_count, ret_lane_ty) = ret.layout().ty.simd_size_and_type(fx.tcx);
assert_eq!(val_lane_count, ptr_lane_count);
assert_eq!(val_lane_count, mask_lane_count);
assert_eq!(val_lane_count, ret_lane_count);
let lane_clif_ty = fx.clif_type(val_lane_ty).unwrap();
let ret_lane_layout = fx.layout_of(ret_lane_ty);
for lane_idx in 0..ptr_lane_count {
let val_lane = val.value_lane(fx, lane_idx).load_scalar(fx);
let ptr_lane = ptr.value_lane(fx, lane_idx).load_scalar(fx);
let mask_lane = mask.value_lane(fx, lane_idx).load_scalar(fx);
let if_enabled = fx.bcx.create_block();
let if_disabled = fx.bcx.create_block();
let next = fx.bcx.create_block();
let res_lane = fx.bcx.append_block_param(next, lane_clif_ty);
fx.bcx.ins().brif(mask_lane, if_enabled, &[], if_disabled, &[]);
fx.bcx.seal_block(if_enabled);
fx.bcx.seal_block(if_disabled);
fx.bcx.switch_to_block(if_enabled);
let res = fx.bcx.ins().load(lane_clif_ty, MemFlags::trusted(), ptr_lane, 0);
fx.bcx.ins().jump(next, &[res]);
fx.bcx.switch_to_block(if_disabled);
fx.bcx.ins().jump(next, &[val_lane]);
fx.bcx.seal_block(next);
fx.bcx.switch_to_block(next);
fx.bcx.ins().nop();
ret.place_lane(fx, lane_idx)
.write_cvalue(fx, CValue::by_val(res_lane, ret_lane_layout));
}
}
sym::simd_scatter => {
intrinsic_args!(fx, args => (val, ptr, mask); intrinsic);
let (val_lane_count, _val_lane_ty) = val.layout().ty.simd_size_and_type(fx.tcx);
let (ptr_lane_count, _ptr_lane_ty) = ptr.layout().ty.simd_size_and_type(fx.tcx);
let (mask_lane_count, _mask_lane_ty) = mask.layout().ty.simd_size_and_type(fx.tcx);
assert_eq!(val_lane_count, ptr_lane_count);
assert_eq!(val_lane_count, mask_lane_count);
for lane_idx in 0..ptr_lane_count {
let val_lane = val.value_lane(fx, lane_idx).load_scalar(fx);
let ptr_lane = ptr.value_lane(fx, lane_idx).load_scalar(fx);
let mask_lane = mask.value_lane(fx, lane_idx).load_scalar(fx);
let if_enabled = fx.bcx.create_block();
let next = fx.bcx.create_block();
fx.bcx.ins().brif(mask_lane, if_enabled, &[], next, &[]);
fx.bcx.seal_block(if_enabled);
fx.bcx.switch_to_block(if_enabled);
fx.bcx.ins().store(MemFlags::trusted(), val_lane, ptr_lane, 0);
fx.bcx.ins().jump(next, &[]);
fx.bcx.seal_block(next);
fx.bcx.switch_to_block(next);
}
}
_ => {
fx.tcx.sess.span_err(span, format!("Unknown SIMD intrinsic {}", intrinsic));
// Prevent verifier error
fx.bcx.ins().trap(TrapCode::UnreachableCodeReached);
return;
}
}
let ret_block = fx.get_block(target);
fx.bcx.ins().jump(ret_block, &[]);
}