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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2020-2023. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#include "beam_asm.hpp"
extern "C"
{
#include "big.h"
}
/* Checks whether d0 contains a finite value.
*
* Clobbers d30 and d31. */
void BeamGlobalAssembler::emit_check_float_error() {
Label double_max = a.newLabel(), error = a.newLabel();
a.fabs(a64::d30, a64::d0);
a.ldr(a64::d31, arm::Mem(double_max));
a.fcmp(a64::d30, a64::d31);
a.b_hi(error);
a.ret(a64::x30);
a.align(AlignMode::kCode, 8);
a.bind(double_max);
a.embedUInt64(0x7FEFFFFFFFFFFFFFul);
a.bind(error);
{
mov_imm(ARG4, 0);
mov_imm(TMP1, EXC_BADARITH);
a.str(TMP1, arm::Mem(c_p, offsetof(Process, freason)));
a.b(labels[raise_exception]);
}
}
void BeamModuleAssembler::emit_float_instr(uint32_t instId,
const ArgFRegister &LHS,
const ArgFRegister &RHS,
const ArgFRegister &Dst) {
auto lhs = load_source(LHS, a64::d0);
auto rhs = load_source(RHS, a64::d1);
auto dst = init_destination(Dst, a64::d2);
a.emit(instId, a64::d0, lhs.reg, rhs.reg);
fragment_call(ga->get_check_float_error());
a.mov(dst.reg, a64::d0);
flush_var(dst);
}
/* * * * */
void BeamModuleAssembler::emit_fload(const ArgSource &Src,
const ArgFRegister &Dst) {
auto src = load_source(Src, TMP1);
auto dst = init_destination(Dst, a64::d0);
arm::Gp float_ptr = emit_ptr_val(TMP1, src.reg);
a.ldur(dst.reg, emit_boxed_val(float_ptr, sizeof(Eterm)));
flush_var(dst);
}
void BeamModuleAssembler::emit_fstore(const ArgFRegister &Src,
const ArgRegister &Dst) {
auto src = load_source(Src, a64::d0);
auto dst = init_destination(Dst, TMP1);
a.add(dst.reg, HTOP, imm(TAG_PRIMARY_BOXED));
mov_imm(TMP2, HEADER_FLONUM);
a.str(TMP2, arm::Mem(HTOP).post(sizeof(Eterm)));
a.str(src.reg, arm::Mem(HTOP).post(sizeof(Eterm)));
flush_var(dst);
}
/* ARG1 = source term */
void BeamGlobalAssembler::emit_fconv_shared() {
Label error = a.newLabel();
/* Is the source a bignum? */
{
emit_is_boxed(error, ARG1);
emit_untag_ptr(TMP1, ARG1);
a.ldr(TMP1, arm::Mem(TMP1));
/* The mask (0b111011) cannot be encoded as an immediate operand for
* 'and'. */
mov_imm(TMP2, _TAG_HEADER_MASK - _BIG_SIGN_BIT);
a.and_(TMP2, TMP1, TMP2);
a.cmp(TMP2, imm(_TAG_HEADER_POS_BIG));
a.b_ne(error);
}
emit_enter_runtime_frame();
emit_enter_runtime();
/* ARG1 already contains the source term. */
lea(ARG2, TMP_MEM1q);
runtime_call<2>(big_to_double);
emit_leave_runtime();
emit_leave_runtime_frame();
a.tbnz(ARG1.w(), imm(31), error);
a.ldr(a64::d0, TMP_MEM1q);
a.ret(a64::x30);
a.bind(error);
{
mov_imm(ARG4, 0);
mov_imm(TMP1, EXC_BADARITH);
a.str(TMP1, arm::Mem(c_p, offsetof(Process, freason)));
a.b(labels[raise_exception]);
}
}
void BeamModuleAssembler::emit_fconv(const ArgSource &Src,
const ArgFRegister &Dst) {
auto dst = init_destination(Dst, a64::d0);
auto src = load_source(Src, ARG1);
if (always_small(Src)) {
comment("skipped test for small operand since it is always small");
a.asr(TMP1, src.reg, imm(_TAG_IMMED1_SIZE));
a.scvtf(dst.reg, TMP1);
flush_var(dst);
return;
}
Label next = a.newLabel(), not_small = a.newLabel(),
fallback = a.newLabel();
a.and_(TMP1, src.reg, imm(_TAG_IMMED1_MASK));
a.cmp(TMP1, imm(_TAG_IMMED1_MASK));
a.b_ne(not_small);
a.asr(TMP1, src.reg, imm(_TAG_IMMED1_SIZE));
a.scvtf(dst.reg, TMP1);
a.b(next);
a.bind(not_small);
{
if (never_one_of<BeamTypeId::Float>(Src)) {
comment("skipped float path since source cannot be a float");
} else {
/* If the source is always a number, we can skip the box test when
* it's not a small. */
if (always_one_of<BeamTypeId::Number>(Src)) {
comment("skipped box test since source is always a number");
} else {
emit_is_boxed(fallback, Src, src.reg);
}
emit_untag_ptr(TMP1, src.reg);
/* Speculatively load the float value, this is safe since all boxed
* terms are at least two words long. */
a.ldr(dst.reg, arm::Mem(TMP1, sizeof(Eterm)));
a.ldr(TMP1, arm::Mem(TMP1));
a.cmp(TMP1, imm(HEADER_FLONUM));
a.b_eq(next);
}
a.bind(fallback);
{
mov_var(ARG1, src);
fragment_call(ga->get_fconv_shared());
mov_var(dst, a64::d0);
}
}
a.bind(next);
flush_var(dst);
}
void BeamModuleAssembler::emit_i_fadd(const ArgFRegister &LHS,
const ArgFRegister &RHS,
const ArgFRegister &Dst) {
emit_float_instr(a64::Inst::kIdFadd_v, LHS, RHS, Dst);
}
void BeamModuleAssembler::emit_i_fsub(const ArgFRegister &LHS,
const ArgFRegister &RHS,
const ArgFRegister &Dst) {
emit_float_instr(a64::Inst::kIdFsub_v, LHS, RHS, Dst);
}
void BeamModuleAssembler::emit_i_fmul(const ArgFRegister &LHS,
const ArgFRegister &RHS,
const ArgFRegister &Dst) {
emit_float_instr(a64::Inst::kIdFmul_v, LHS, RHS, Dst);
}
void BeamModuleAssembler::emit_i_fdiv(const ArgFRegister &LHS,
const ArgFRegister &RHS,
const ArgFRegister &Dst) {
emit_float_instr(a64::Inst::kIdFdiv_v, LHS, RHS, Dst);
}
void BeamModuleAssembler::emit_i_fnegate(const ArgFRegister &Src,
const ArgFRegister &Dst) {
auto src = load_source(Src, a64::d0);
auto dst = init_destination(Dst, a64::d1);
/* Note that there is no need to check for errors since flipping the sign
* of a finite float is guaranteed to produce a finite float. */
a.fneg(a64::d0, src.reg);
a.mov(dst.reg, a64::d0);
flush_var(dst);
}
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