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//! Emulate LLVM intrinsics
use crate::intrinsics::*;
use crate::prelude::*;
use rustc_middle::ty::subst::SubstsRef;
pub(crate) fn codegen_llvm_intrinsic_call<'tcx>(
fx: &mut FunctionCx<'_, '_, 'tcx>,
intrinsic: &str,
substs: SubstsRef<'tcx>,
args: &[mir::Operand<'tcx>],
destination: Option<(CPlace<'tcx>, BasicBlock)>,
) {
let ret = destination.unwrap().0;
intrinsic_match! {
fx, intrinsic, substs, args,
_ => {
fx.tcx.sess.warn(&format!("unsupported llvm intrinsic {}; replacing with trap", intrinsic));
crate::trap::trap_unimplemented(fx, intrinsic);
};
// Used by `_mm_movemask_epi8` and `_mm256_movemask_epi8`
"llvm.x86.sse2.pmovmskb.128" | "llvm.x86.avx2.pmovmskb" | "llvm.x86.sse2.movmsk.pd", (c a) {
let (lane_count, lane_ty) = a.layout().ty.simd_size_and_type(fx.tcx);
let lane_ty = fx.clif_type(lane_ty).unwrap();
assert!(lane_count <= 32);
let mut res = fx.bcx.ins().iconst(types::I32, 0);
for lane in (0..lane_count).rev() {
let a_lane = a.value_field(fx, mir::Field::new(lane.try_into().unwrap())).load_scalar(fx);
// cast float to int
let a_lane = match lane_ty {
types::F32 => fx.bcx.ins().bitcast(types::I32, a_lane),
types::F64 => fx.bcx.ins().bitcast(types::I64, a_lane),
_ => a_lane,
};
// extract sign bit of an int
let a_lane_sign = fx.bcx.ins().ushr_imm(a_lane, i64::from(lane_ty.bits() - 1));
// shift sign bit into result
let a_lane_sign = clif_intcast(fx, a_lane_sign, types::I32, false);
res = fx.bcx.ins().ishl_imm(res, 1);
res = fx.bcx.ins().bor(res, a_lane_sign);
}
let res = CValue::by_val(res, fx.layout_of(fx.tcx.types.i32));
ret.write_cvalue(fx, res);
};
"llvm.x86.sse2.cmp.ps" | "llvm.x86.sse2.cmp.pd", (c x, c y, o kind) {
let kind_const = crate::constant::mir_operand_get_const_val(fx, kind).expect("llvm.x86.sse2.cmp.* kind not const");
let flt_cc = match kind_const.try_to_bits(Size::from_bytes(1)).unwrap_or_else(|| panic!("kind not scalar: {:?}", kind_const)) {
0 => FloatCC::Equal,
1 => FloatCC::LessThan,
2 => FloatCC::LessThanOrEqual,
7 => {
unimplemented!("Compares corresponding elements in `a` and `b` to see if neither is `NaN`.");
}
3 => {
unimplemented!("Compares corresponding elements in `a` and `b` to see if either is `NaN`.");
}
4 => FloatCC::NotEqual,
5 => {
unimplemented!("not less than");
}
6 => {
unimplemented!("not less than or equal");
}
kind => unreachable!("kind {:?}", kind),
};
simd_pair_for_each_lane(fx, x, y, ret, |fx, lane_layout, res_lane_layout, x_lane, y_lane| {
let res_lane = match lane_layout.ty.kind() {
ty::Float(_) => fx.bcx.ins().fcmp(flt_cc, x_lane, y_lane),
_ => unreachable!("{:?}", lane_layout.ty),
};
bool_to_zero_or_max_uint(fx, res_lane_layout, res_lane)
});
};
"llvm.x86.sse2.psrli.d", (c a, o imm8) {
let imm8 = crate::constant::mir_operand_get_const_val(fx, imm8).expect("llvm.x86.sse2.psrli.d imm8 not const");
simd_for_each_lane(fx, a, ret, |fx, _lane_layout, res_lane_layout, lane| {
let res_lane = match imm8.try_to_bits(Size::from_bytes(4)).unwrap_or_else(|| panic!("imm8 not scalar: {:?}", imm8)) {
imm8 if imm8 < 32 => fx.bcx.ins().ushr_imm(lane, i64::from(imm8 as u8)),
_ => fx.bcx.ins().iconst(types::I32, 0),
};
CValue::by_val(res_lane, res_lane_layout)
});
};
"llvm.x86.sse2.pslli.d", (c a, o imm8) {
let imm8 = crate::constant::mir_operand_get_const_val(fx, imm8).expect("llvm.x86.sse2.psrli.d imm8 not const");
simd_for_each_lane(fx, a, ret, |fx, _lane_layout, res_lane_layout, lane| {
let res_lane = match imm8.try_to_bits(Size::from_bytes(4)).unwrap_or_else(|| panic!("imm8 not scalar: {:?}", imm8)) {
imm8 if imm8 < 32 => fx.bcx.ins().ishl_imm(lane, i64::from(imm8 as u8)),
_ => fx.bcx.ins().iconst(types::I32, 0),
};
CValue::by_val(res_lane, res_lane_layout)
});
};
"llvm.x86.sse2.storeu.dq", (v mem_addr, c a) {
// FIXME correctly handle the unalignment
let dest = CPlace::for_ptr(Pointer::new(mem_addr), a.layout());
dest.write_cvalue(fx, a);
};
"llvm.x86.addcarry.64", (v c_in, c a, c b) {
llvm_add_sub(
fx,
BinOp::Add,
ret,
c_in,
a,
b
);
};
"llvm.x86.subborrow.64", (v b_in, c a, c b) {
llvm_add_sub(
fx,
BinOp::Sub,
ret,
b_in,
a,
b
);
};
}
if let Some((_, dest)) = destination {
let ret_block = fx.get_block(dest);
fx.bcx.ins().jump(ret_block, &[]);
} else {
trap_unreachable(fx, "[corruption] Diverging intrinsic returned.");
}
}
// llvm.x86.avx2.vperm2i128
// llvm.x86.ssse3.pshuf.b.128
// llvm.x86.avx2.pshuf.b
// llvm.x86.avx2.psrli.w
// llvm.x86.sse2.psrli.w
fn llvm_add_sub<'tcx>(
fx: &mut FunctionCx<'_, '_, 'tcx>,
bin_op: BinOp,
ret: CPlace<'tcx>,
cb_in: Value,
a: CValue<'tcx>,
b: CValue<'tcx>,
) {
assert_eq!(
a.layout().ty,
fx.tcx.types.u64,
"llvm.x86.addcarry.64/llvm.x86.subborrow.64 second operand must be u64"
);
assert_eq!(
b.layout().ty,
fx.tcx.types.u64,
"llvm.x86.addcarry.64/llvm.x86.subborrow.64 third operand must be u64"
);
// c + carry -> c + first intermediate carry or borrow respectively
let int0 = crate::num::codegen_checked_int_binop(fx, bin_op, a, b);
let c = int0.value_field(fx, mir::Field::new(0));
let cb0 = int0.value_field(fx, mir::Field::new(1)).load_scalar(fx);
// c + carry -> c + second intermediate carry or borrow respectively
let cb_in_as_u64 = fx.bcx.ins().uextend(types::I64, cb_in);
let cb_in_as_u64 = CValue::by_val(cb_in_as_u64, fx.layout_of(fx.tcx.types.u64));
let int1 = crate::num::codegen_checked_int_binop(fx, bin_op, c, cb_in_as_u64);
let (c, cb1) = int1.load_scalar_pair(fx);
// carry0 | carry1 -> carry or borrow respectively
let cb_out = fx.bcx.ins().bor(cb0, cb1);
let layout = fx.layout_of(fx.tcx.mk_tup([fx.tcx.types.u8, fx.tcx.types.u64].iter()));
let val = CValue::by_val_pair(cb_out, c, layout);
ret.write_cvalue(fx, val);
}
|
