--- /dev/null
+//! Emulate x86 LLVM intrinsics
+
+use crate::intrinsics::*;
+use crate::prelude::*;
+
+use rustc_middle::ty::subst::SubstsRef;
+
+pub(crate) fn codegen_x86_llvm_intrinsic_call<'tcx>(
+ fx: &mut FunctionCx<'_, '_, 'tcx>,
+ intrinsic: &str,
+ _substs: SubstsRef<'tcx>,
+ args: &[mir::Operand<'tcx>],
+ ret: CPlace<'tcx>,
+ target: Option<BasicBlock>,
+) {
+ match intrinsic {
+ "llvm.x86.sse2.pause" | "llvm.aarch64.isb" => {
+ // Spin loop hint
+ }
+
+ // Used by `_mm_movemask_epi8` and `_mm256_movemask_epi8`
+ "llvm.x86.sse2.pmovmskb.128" | "llvm.x86.avx2.pmovmskb" | "llvm.x86.sse2.movmsk.pd" => {
+ intrinsic_args!(fx, args => (a); intrinsic);
+
+ 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_lane(fx, lane).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" => {
+ let (x, y, kind) = match args {
+ [x, y, kind] => (x, y, kind),
+ _ => bug!("wrong number of args for intrinsic {intrinsic}"),
+ };
+ let x = codegen_operand(fx, x);
+ let y = codegen_operand(fx, y);
+ let kind = crate::constant::mir_operand_get_const_val(fx, kind)
+ .expect("llvm.x86.sse2.cmp.* kind not const");
+
+ let flt_cc = match kind
+ .try_to_bits(Size::from_bytes(1))
+ .unwrap_or_else(|| panic!("kind not scalar: {:?}", kind))
+ {
+ 0 => FloatCC::Equal,
+ 1 => FloatCC::LessThan,
+ 2 => FloatCC::LessThanOrEqual,
+ 7 => FloatCC::Ordered,
+ 3 => FloatCC::Unordered,
+ 4 => FloatCC::NotEqual,
+ 5 => FloatCC::UnorderedOrGreaterThanOrEqual,
+ 6 => FloatCC::UnorderedOrGreaterThan,
+ kind => unreachable!("kind {:?}", kind),
+ };
+
+ 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() {
+ ty::Float(_) => fx.bcx.ins().fcmp(flt_cc, x_lane, y_lane),
+ _ => unreachable!("{:?}", lane_ty),
+ };
+ bool_to_zero_or_max_uint(fx, res_lane_ty, res_lane)
+ });
+ }
+ "llvm.x86.sse2.psrli.d" => {
+ let (a, imm8) = match args {
+ [a, imm8] => (a, imm8),
+ _ => bug!("wrong number of args for intrinsic {intrinsic}"),
+ };
+ let a = codegen_operand(fx, a);
+ 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_ty, _res_lane_ty, 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),
+ });
+ }
+ "llvm.x86.sse2.pslli.d" => {
+ let (a, imm8) = match args {
+ [a, imm8] => (a, imm8),
+ _ => bug!("wrong number of args for intrinsic {intrinsic}"),
+ };
+ let a = codegen_operand(fx, a);
+ 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_ty, _res_lane_ty, 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),
+ });
+ }
+ "llvm.x86.sse2.storeu.dq" => {
+ intrinsic_args!(fx, args => (mem_addr, a); intrinsic);
+ let mem_addr = mem_addr.load_scalar(fx);
+
+ // 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" => {
+ intrinsic_args!(fx, args => (c_in, a, b); intrinsic);
+ let c_in = c_in.load_scalar(fx);
+
+ llvm_add_sub(fx, BinOp::Add, ret, c_in, a, b);
+ }
+ "llvm.x86.subborrow.64" => {
+ intrinsic_args!(fx, args => (b_in, a, b); intrinsic);
+ let b_in = b_in.load_scalar(fx);
+
+ llvm_add_sub(fx, BinOp::Sub, ret, b_in, a, b);
+ }
+ _ => {
+ fx.tcx.sess.warn(&format!(
+ "unsupported x86 llvm intrinsic {}; replacing with trap",
+ intrinsic
+ ));
+ crate::trap::trap_unimplemented(fx, intrinsic);
+ return;
+ }
+ }
+
+ let dest = target.expect("all llvm intrinsics used by stdlib should return");
+ let ret_block = fx.get_block(dest);
+ fx.bcx.ins().jump(ret_block, &[]);
+}
+
+// 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);
+}
projects / rustc.git / blobdiff