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mir-gen-x86_64.c
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mir-gen-x86_64.c
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/* This file is a part of MIR project.
Copyright (C) 2018-2024 Vladimir Makarov <vmakarov.gcc@gmail.com>.
*/
#include <limits.h>
#include "mir-x86_64.h"
static const MIR_reg_t FP_HARD_REG = BP_HARD_REG;
static inline MIR_reg_t target_nth_loc (MIR_reg_t loc, MIR_type_t type MIR_UNUSED, int n) {
return loc + n;
}
static inline int target_call_used_hard_reg_p (MIR_reg_t hard_reg, MIR_type_t type MIR_UNUSED) {
assert (hard_reg <= MAX_HARD_REG);
#ifndef _WIN32
return !(hard_reg == BX_HARD_REG || (hard_reg >= R12_HARD_REG && hard_reg <= R15_HARD_REG));
#else
return !(hard_reg == BX_HARD_REG || hard_reg == SI_HARD_REG || hard_reg == DI_HARD_REG
|| (hard_reg >= R12_HARD_REG && hard_reg <= R15_HARD_REG)
|| (hard_reg >= XMM6_HARD_REG && hard_reg <= XMM15_HARD_REG));
#endif
}
/* Stack layout (sp refers to the last reserved stack slot address)
from higher address to lower address memory:
FP is required: FP omitted:
| | prev func stack frame | |
| ... | (start addr aligned to 16 bytes) | ... |
|---------------| |---------------|
| return pc | sp before call = start sp hard reg | |
| | absent for jcall/jret func | return pc |
|---------------| | |
| old bp | new bp refers here | |
|---------------| |---------------|
| reg save | 176 bytes optional area for | reg save |
| area | vararg func reg save area | area |
|---------------| |---------------|
| slots assigned| can be absent for small functions | saved regs |
| to pseudos | (known only after RA) | |
|---------------| | |
| saved regs | callee saved regs used in the func | |
|---------------| (known only after RA) |---------------|
| alloca areas | optional | |
|---------------| | slot assigned |
| slots for | dynamically reserved/freed | to pseudos |
| passing args | by caller | |
|---------------| |---------------|
| spill space | WIN32 only: 32 bytes spill space | spill space |
|---------------| for reg args (allocated at call) |---------------|
size of slots and saved regs is multiple of 16 bytes
will be fp ommited is defined after machinize
*/
#ifndef _WIN32
static const int reg_save_area_size = 176;
static const int spill_space_size = 0;
#else
static const int reg_save_area_size = 0;
static const int spill_space_size = 32;
#endif
static const MIR_insn_code_t target_io_dup_op_insn_codes[] = {
/* see possible patterns */
MIR_ADD, MIR_ADDS, MIR_FADD, MIR_DADD, MIR_LDADD, MIR_SUB, MIR_SUBS, MIR_FSUB,
MIR_DSUB, MIR_LDSUB, MIR_MUL, MIR_MULS, MIR_FMUL, MIR_DMUL, MIR_LDMUL, MIR_FDIV,
MIR_DDIV, MIR_LDDIV, MIR_AND, MIR_ANDS, MIR_OR, MIR_ORS, MIR_XOR, MIR_XORS,
MIR_LSH, MIR_LSHS, MIR_RSH, MIR_RSHS, MIR_URSH, MIR_URSHS, MIR_NEG, MIR_NEGS,
MIR_FNEG, MIR_DNEG, MIR_LDNEG, MIR_ADDO, MIR_ADDOS, MIR_SUBO, MIR_SUBOS, MIR_MULO,
MIR_MULOS, MIR_UMULO, MIR_UMULOS, MIR_INSN_BOUND,
};
static MIR_insn_code_t get_ext_code (MIR_type_t type) {
switch (type) {
case MIR_T_I8: return MIR_EXT8;
case MIR_T_U8: return MIR_UEXT8;
case MIR_T_I16: return MIR_EXT16;
case MIR_T_U16: return MIR_UEXT16;
case MIR_T_I32: return MIR_EXT32;
case MIR_T_U32: return MIR_UEXT32;
default: return MIR_INVALID_INSN;
}
}
static MIR_reg_t get_fp_arg_reg (size_t fp_arg_num) {
switch (fp_arg_num) {
case 0:
case 1:
case 2:
case 3:
#ifndef _WIN32
case 4:
case 5:
case 6:
case 7:
#endif
return (MIR_reg_t) (XMM0_HARD_REG + fp_arg_num);
default: return MIR_NON_VAR;
}
}
static MIR_reg_t get_int_arg_reg (size_t int_arg_num) {
switch (int_arg_num
#ifdef _WIN32
+ 2
#endif
) {
case 0: return DI_HARD_REG;
case 1: return SI_HARD_REG;
#ifdef _WIN32
case 2: return CX_HARD_REG;
case 3: return DX_HARD_REG;
#else
case 2: return DX_HARD_REG;
case 3: return CX_HARD_REG;
#endif
case 4: return R8_HARD_REG;
case 5: return R9_HARD_REG;
default: return MIR_NON_VAR;
}
}
#ifdef _WIN32
static int get_int_arg_reg_num (MIR_reg_t arg_reg) {
switch (arg_reg) {
case CX_HARD_REG: return 0;
case DX_HARD_REG: return 1;
case R8_HARD_REG: return 2;
case R9_HARD_REG: return 3;
default: assert (FALSE); return 0;
}
}
#endif
static MIR_reg_t get_arg_reg (MIR_type_t arg_type, size_t *int_arg_num, size_t *fp_arg_num,
MIR_insn_code_t *mov_code) {
MIR_reg_t arg_reg;
if (arg_type == MIR_T_LD) {
arg_reg = MIR_NON_VAR;
*mov_code = MIR_LDMOV;
} else if (arg_type == MIR_T_F || arg_type == MIR_T_D) {
arg_reg = get_fp_arg_reg (*fp_arg_num);
(*fp_arg_num)++;
#ifdef _WIN32
(*int_arg_num)++; /* arg slot used by fp, skip int register */
#endif
*mov_code = arg_type == MIR_T_F ? MIR_FMOV : MIR_DMOV;
} else { /* including RBLK */
arg_reg = get_int_arg_reg (*int_arg_num);
#ifdef _WIN32
(*fp_arg_num)++; /* arg slot used by int, skip fp register */
#endif
(*int_arg_num)++;
*mov_code = MIR_MOV;
}
return arg_reg;
}
static void gen_mov (gen_ctx_t gen_ctx, MIR_insn_t anchor, MIR_insn_code_t code, MIR_op_t dst_op,
MIR_op_t src_op) {
gen_add_insn_before (gen_ctx, anchor, MIR_new_insn (gen_ctx->ctx, code, dst_op, src_op));
}
static void prohibit_omitting_fp (gen_ctx_t gen_ctx);
static void machinize_call (gen_ctx_t gen_ctx, MIR_insn_t call_insn) {
MIR_context_t ctx = gen_ctx->ctx;
MIR_func_t func = curr_func_item->u.func;
MIR_proto_t proto = call_insn->ops[0].u.ref->u.proto;
size_t size, nargs, nops = MIR_insn_nops (ctx, call_insn), start = proto->nres + 2;
size_t int_arg_num = 0, fp_arg_num = 0, xmm_args = 0;
size_t init_arg_stack_size = spill_space_size, arg_stack_size = init_arg_stack_size;
#ifdef _WIN32
size_t block_offset = spill_space_size;
#endif
MIR_type_t type, mem_type;
MIR_op_mode_t mode;
MIR_var_t *arg_vars = NULL;
MIR_reg_t arg_reg;
MIR_op_t arg_op, new_arg_op, temp_op, ret_reg_op, mem_op;
MIR_insn_code_t new_insn_code, ext_code;
MIR_insn_t new_insn, prev_insn, next_insn, ext_insn;
MIR_insn_t prev_call_insn = DLIST_PREV (MIR_insn_t, call_insn);
uint32_t n_iregs, n_xregs, n_fregs;
assert (prev_call_insn != NULL);
if (call_insn->code == MIR_INLINE) call_insn->code = MIR_CALL;
if (proto->args == NULL) {
nargs = 0;
} else {
gen_assert (nops >= VARR_LENGTH (MIR_var_t, proto->args)
&& (proto->vararg_p || nops - start == VARR_LENGTH (MIR_var_t, proto->args)));
nargs = VARR_LENGTH (MIR_var_t, proto->args);
arg_vars = VARR_ADDR (MIR_var_t, proto->args);
}
if (call_insn->ops[1].mode != MIR_OP_VAR && call_insn->ops[1].mode != MIR_OP_REF) {
temp_op = _MIR_new_var_op (ctx, gen_new_temp_reg (gen_ctx, MIR_T_I64, func));
new_insn = MIR_new_insn (ctx, MIR_MOV, temp_op, call_insn->ops[1]);
call_insn->ops[1] = temp_op;
gen_add_insn_before (gen_ctx, call_insn, new_insn);
}
#ifdef _WIN32
if ((nops - start) > 4) block_offset = (nops - start) * 8;
#endif
for (size_t i = start; i < nops; i++) {
arg_op = call_insn->ops[i];
gen_assert (arg_op.mode == MIR_OP_VAR
|| (arg_op.mode == MIR_OP_VAR_MEM && MIR_all_blk_type_p (arg_op.u.var_mem.type)));
if (i - start < nargs) {
type = arg_vars[i - start].type;
} else if (arg_op.mode == MIR_OP_VAR_MEM) {
type = arg_op.u.var_mem.type;
assert (MIR_all_blk_type_p (type));
} else {
mode = call_insn->ops[i].value_mode; // ??? smaller ints
gen_assert (mode == MIR_OP_INT || mode == MIR_OP_UINT || mode == MIR_OP_FLOAT
|| mode == MIR_OP_DOUBLE || mode == MIR_OP_LDOUBLE);
if (mode == MIR_OP_FLOAT)
(*MIR_get_error_func (ctx)) (MIR_call_op_error,
"passing float variadic arg (should be passed as double)");
type = mode == MIR_OP_DOUBLE ? MIR_T_D : mode == MIR_OP_LDOUBLE ? MIR_T_LD : MIR_T_I64;
}
if (xmm_args < 8 && (type == MIR_T_F || type == MIR_T_D)) xmm_args++;
ext_insn = NULL;
if ((ext_code = get_ext_code (type)) != MIR_INVALID_INSN) { /* extend arg if necessary */
temp_op = _MIR_new_var_op (ctx, gen_new_temp_reg (gen_ctx, MIR_T_I64, func));
ext_insn = MIR_new_insn (ctx, ext_code, temp_op, arg_op);
call_insn->ops[i] = arg_op = temp_op;
}
size = 0;
if (MIR_blk_type_p (type)) {
gen_assert (arg_op.mode == MIR_OP_VAR_MEM);
size = (arg_op.u.var_mem.disp + 7) / 8 * 8;
gen_assert (prev_call_insn != NULL); /* call_insn should not be 1st after simplification */
}
#ifndef _WIN32
if ((type == MIR_T_BLK + 1 && get_int_arg_reg (int_arg_num) != MIR_NON_VAR
&& (size <= 8 || get_int_arg_reg (int_arg_num + 1) != MIR_NON_VAR))
|| (type == MIR_T_BLK + 2 && get_fp_arg_reg (fp_arg_num) != MIR_NON_VAR
&& (size <= 8 || get_fp_arg_reg (fp_arg_num + 1) != MIR_NON_VAR))) {
/* all is passed in gprs or fprs */
MIR_type_t mov_type = type == MIR_T_BLK + 1 ? MIR_T_I64 : MIR_T_D;
MIR_insn_code_t mov_code;
MIR_reg_t reg2, reg1 = get_arg_reg (mov_type, &int_arg_num, &fp_arg_num, &mov_code);
assert (size <= 16);
new_insn = MIR_new_insn (ctx, mov_code, _MIR_new_var_op (ctx, reg1),
_MIR_new_var_mem_op (ctx, mov_type, 0, arg_op.u.var_mem.base,
MIR_NON_VAR, 1));
gen_add_insn_before (gen_ctx, call_insn, new_insn);
setup_call_hard_reg_args (gen_ctx, call_insn, reg1);
call_insn->ops[i].u.var_mem.base = MIR_NON_VAR; /* not used anymore */
if (size > 8) {
reg2 = get_arg_reg (mov_type, &int_arg_num, &fp_arg_num, &mov_code);
new_insn = MIR_new_insn (ctx, mov_code, _MIR_new_var_op (ctx, reg2),
_MIR_new_var_mem_op (ctx, mov_type, 8, arg_op.u.var_mem.base,
MIR_NON_VAR, 1));
gen_add_insn_before (gen_ctx, call_insn, new_insn);
setup_call_hard_reg_args (gen_ctx, call_insn, reg2);
}
continue;
} else if ((type == MIR_T_BLK + 3 || type == MIR_T_BLK + 4)
&& get_int_arg_reg (int_arg_num) != MIR_NON_VAR
&& get_fp_arg_reg (fp_arg_num) != MIR_NON_VAR) {
/* gpr and then fpr or fpr and then gpr */
MIR_type_t mov_type1 = type == MIR_T_BLK + 3 ? MIR_T_I64 : MIR_T_D;
MIR_type_t mov_type2 = type == MIR_T_BLK + 3 ? MIR_T_D : MIR_T_I64;
MIR_insn_code_t mov_code1, mov_code2;
MIR_reg_t reg1 = get_arg_reg (mov_type1, &int_arg_num, &fp_arg_num, &mov_code1);
MIR_reg_t reg2 = get_arg_reg (mov_type2, &int_arg_num, &fp_arg_num, &mov_code2);
assert (size > 8 && size <= 16);
new_insn = MIR_new_insn (ctx, mov_code1, _MIR_new_var_op (ctx, reg1),
_MIR_new_var_mem_op (ctx, mov_type1, 0, arg_op.u.var_mem.base,
MIR_NON_VAR, 1));
setup_call_hard_reg_args (gen_ctx, call_insn, reg1);
call_insn->ops[i].u.var_mem.base = MIR_NON_VAR; /* not used anymore */
gen_add_insn_before (gen_ctx, call_insn, new_insn);
new_insn = MIR_new_insn (ctx, mov_code2, _MIR_new_var_op (ctx, reg2),
_MIR_new_var_mem_op (ctx, mov_type2, 8, arg_op.u.var_mem.base,
MIR_NON_VAR, 1));
gen_add_insn_before (gen_ctx, call_insn, new_insn);
setup_call_hard_reg_args (gen_ctx, call_insn, reg2);
continue;
}
#endif
if (MIR_blk_type_p (type)) { /* put block arg on the stack */
MIR_insn_t load_insn;
size_t disp, dest_disp, start_dest_disp;
int first_p, by_val_p = FALSE;
#ifdef _WIN32
by_val_p = size <= 8;
#endif
if (by_val_p) {
temp_op = _MIR_new_var_op (ctx, gen_new_temp_reg (gen_ctx, MIR_T_I64, func));
mem_op = _MIR_new_var_mem_op (ctx, MIR_T_I64, 0, arg_op.u.var_mem.base, MIR_NON_VAR, 1);
load_insn = MIR_new_insn (ctx, MIR_MOV, temp_op, mem_op);
gen_add_insn_after (gen_ctx, prev_call_insn, load_insn);
arg_op = temp_op;
} else if (size > 0 && size <= 2 * 8) { /* upto 2 moves */
disp = 0;
first_p = TRUE;
temp_op = _MIR_new_var_op (ctx, gen_new_temp_reg (gen_ctx, MIR_T_I64, func));
while (size != 0) {
mem_op
= _MIR_new_var_mem_op (ctx, MIR_T_I64, disp, arg_op.u.var_mem.base, MIR_NON_VAR, 1);
load_insn = MIR_new_insn (ctx, MIR_MOV, temp_op, mem_op);
gen_add_insn_after (gen_ctx, prev_call_insn, load_insn);
disp += 8;
#ifdef _WIN32
dest_disp = block_offset;
if (first_p) start_dest_disp = dest_disp;
block_offset += 8;
#else
dest_disp = arg_stack_size;
arg_stack_size += 8;
#endif
mem_op = _MIR_new_var_mem_op (ctx, MIR_T_I64, dest_disp, SP_HARD_REG, MIR_NON_VAR, 1);
new_insn = MIR_new_insn (ctx, MIR_MOV, mem_op, temp_op);
size -= 8;
gen_add_insn_after (gen_ctx, load_insn, new_insn);
if (first_p) {
call_insn->ops[i]
= _MIR_new_var_mem_op (ctx, type, dest_disp, SP_HARD_REG, MIR_NON_VAR, 1);
first_p = FALSE;
}
}
#ifdef _WIN32
arg_op
= _MIR_new_var_op (ctx, gen_new_temp_reg (gen_ctx, MIR_T_I64, curr_func_item->u.func));
new_insn = MIR_new_insn (ctx, MIR_ADD, arg_op, _MIR_new_var_op (ctx, SP_HARD_REG),
MIR_new_int_op (ctx, start_dest_disp));
gen_add_insn_before (gen_ctx, call_insn, new_insn);
#endif
} else { /* generate memcpy call before call arg moves */
MIR_reg_t dest_reg;
MIR_op_t freg_op, dest_reg_op, ops[5];
MIR_item_t memcpy_proto_item
= _MIR_builtin_proto (ctx, curr_func_item->module, "mir.arg_memcpy.p", 0, NULL, 3,
MIR_T_I64, "dest", MIR_T_I64, "src", MIR_T_I64, "n");
MIR_item_t memcpy_import_item
= _MIR_builtin_func (ctx, curr_func_item->module, "mir.arg_memcpy", memcpy);
freg_op
= _MIR_new_var_op (ctx, gen_new_temp_reg (gen_ctx, MIR_T_I64, curr_func_item->u.func));
dest_reg = gen_new_temp_reg (gen_ctx, MIR_T_I64, curr_func_item->u.func);
dest_reg_op = _MIR_new_var_op (ctx, dest_reg);
ops[0] = MIR_new_ref_op (ctx, memcpy_proto_item);
ops[1] = freg_op;
ops[2] = _MIR_new_var_op (ctx, get_int_arg_reg (0));
ops[3] = _MIR_new_var_op (ctx, get_int_arg_reg (1));
ops[4] = _MIR_new_var_op (ctx, get_int_arg_reg (2));
new_insn = MIR_new_insn_arr (ctx, MIR_CALL, 5, ops);
gen_add_insn_after (gen_ctx, prev_call_insn, new_insn);
new_insn = MIR_new_insn (ctx, MIR_MOV, ops[4], MIR_new_int_op (ctx, size));
gen_add_insn_after (gen_ctx, prev_call_insn, new_insn);
new_insn
= MIR_new_insn (ctx, MIR_MOV, ops[3], _MIR_new_var_op (ctx, arg_op.u.var_mem.base));
gen_add_insn_after (gen_ctx, prev_call_insn, new_insn);
new_insn = MIR_new_insn (ctx, MIR_MOV, ops[2], dest_reg_op);
gen_add_insn_after (gen_ctx, prev_call_insn, new_insn);
#ifdef _WIN32
start_dest_disp = block_offset;
block_offset += size;
#else
start_dest_disp = arg_stack_size;
arg_stack_size += size;
#endif
new_insn = MIR_new_insn (ctx, MIR_ADD, dest_reg_op, _MIR_new_var_op (ctx, SP_HARD_REG),
MIR_new_int_op (ctx, start_dest_disp));
gen_add_insn_after (gen_ctx, prev_call_insn, new_insn);
new_insn = MIR_new_insn (ctx, MIR_MOV, ops[1], MIR_new_ref_op (ctx, memcpy_import_item));
gen_add_insn_after (gen_ctx, prev_call_insn, new_insn);
call_insn->ops[i]
= _MIR_new_var_mem_op (ctx, MIR_T_BLK, arg_op.u.var_mem.disp, dest_reg, MIR_NON_VAR, 1);
#ifdef _WIN32
arg_op = dest_reg_op;
#endif
}
#ifdef _WIN32
if ((arg_reg = get_arg_reg (MIR_T_P, &int_arg_num, &fp_arg_num, &new_insn_code))
!= MIR_NON_VAR) {
new_arg_op = _MIR_new_var_op (ctx, arg_reg);
new_insn = MIR_new_insn (ctx, MIR_MOV, new_arg_op, arg_op);
call_insn->ops[i] = new_arg_op;
} else {
mem_op = _MIR_new_var_mem_op (ctx, MIR_T_I64, arg_stack_size, SP_HARD_REG, MIR_NON_VAR, 1);
new_insn = MIR_new_insn (ctx, MIR_MOV, mem_op, arg_op);
call_insn->ops[i] = mem_op;
arg_stack_size += 8;
}
gen_add_insn_before (gen_ctx, call_insn, new_insn);
#endif
} else if ((arg_reg = get_arg_reg (type, &int_arg_num, &fp_arg_num, &new_insn_code))
!= MIR_NON_VAR) {
/* put arguments to argument hard regs */
if (ext_insn != NULL) gen_add_insn_before (gen_ctx, call_insn, ext_insn);
if (type != MIR_T_RBLK) {
new_arg_op = _MIR_new_var_op (ctx, arg_reg);
new_insn = MIR_new_insn (ctx, new_insn_code, new_arg_op, arg_op);
} else {
assert (arg_op.mode == MIR_OP_VAR_MEM);
new_insn = MIR_new_insn (ctx, new_insn_code, _MIR_new_var_op (ctx, arg_reg),
_MIR_new_var_op (ctx, arg_op.u.var_mem.base));
new_arg_op
= _MIR_new_var_mem_op (ctx, MIR_T_RBLK, arg_op.u.var_mem.disp, arg_reg, MIR_NON_VAR, 1);
}
gen_add_insn_before (gen_ctx, call_insn, new_insn);
call_insn->ops[i] = new_arg_op;
#ifdef _WIN32
/* copy fp reg varargs into corresponding int regs */
if (proto->vararg_p && type == MIR_T_D) {
gen_assert (int_arg_num > 0 && int_arg_num <= 4);
arg_reg = get_int_arg_reg (int_arg_num - 1);
setup_call_hard_reg_args (gen_ctx, call_insn, arg_reg);
/* mir does not support moving fp to int regs directly, spill and load them instead */
mem_op = _MIR_new_var_mem_op (ctx, MIR_T_D, 8, SP_HARD_REG, MIR_NON_VAR, 1);
new_insn = MIR_new_insn (ctx, MIR_DMOV, mem_op, arg_op);
gen_add_insn_before (gen_ctx, call_insn, new_insn);
mem_op = _MIR_new_var_mem_op (ctx, MIR_T_I64, 8, SP_HARD_REG, MIR_NON_VAR, 1);
new_insn = MIR_new_insn (ctx, MIR_MOV, _MIR_new_var_op (ctx, arg_reg), mem_op);
gen_add_insn_before (gen_ctx, call_insn, new_insn);
}
#endif
} else { /* put arguments on the stack */
if (type == MIR_T_RBLK) {
assert (arg_op.mode == MIR_OP_VAR_MEM);
arg_op = _MIR_new_var_op (ctx, arg_op.u.var_mem.base);
}
mem_type = type == MIR_T_F || type == MIR_T_D || type == MIR_T_LD ? type : MIR_T_I64;
new_insn_code = (type == MIR_T_F ? MIR_FMOV
: type == MIR_T_D ? MIR_DMOV
: type == MIR_T_LD ? MIR_LDMOV
: MIR_MOV);
mem_op = _MIR_new_var_mem_op (ctx, mem_type, arg_stack_size, SP_HARD_REG, MIR_NON_VAR, 1);
new_insn = MIR_new_insn (ctx, new_insn_code, mem_op, arg_op);
gen_assert (prev_call_insn != NULL); /* call_insn should not be 1st after simplification */
MIR_insert_insn_after (ctx, curr_func_item, prev_call_insn, new_insn);
prev_insn = DLIST_PREV (MIR_insn_t, new_insn);
next_insn = DLIST_NEXT (MIR_insn_t, new_insn);
create_new_bb_insns (gen_ctx, prev_insn, next_insn, call_insn);
call_insn->ops[i] = mem_op;
#ifdef _WIN32
arg_stack_size += 8;
#else
arg_stack_size += type == MIR_T_LD ? 16 : 8;
#endif
if (ext_insn != NULL) gen_add_insn_after (gen_ctx, prev_call_insn, ext_insn);
}
}
#ifndef _WIN32
if (proto->vararg_p) {
setup_call_hard_reg_args (gen_ctx, call_insn, AX_HARD_REG);
new_insn = MIR_new_insn (ctx, MIR_MOV, _MIR_new_var_op (ctx, AX_HARD_REG),
MIR_new_int_op (ctx, xmm_args));
gen_add_insn_before (gen_ctx, call_insn, new_insn);
}
#else
if (proto->nres > 1)
(*MIR_get_error_func (ctx)) (MIR_ret_error,
"Windows x86-64 doesn't support multiple return values");
#endif
n_iregs = n_xregs = n_fregs = 0;
for (size_t i = 0; i < proto->nres; i++) {
ret_reg_op = call_insn->ops[i + 2];
gen_assert (ret_reg_op.mode == MIR_OP_VAR);
if (proto->res_types[i] == MIR_T_F && n_xregs < 2) {
new_insn = MIR_new_insn (ctx, MIR_FMOV, ret_reg_op,
_MIR_new_var_op (ctx, n_xregs == 0 ? XMM0_HARD_REG : XMM1_HARD_REG));
n_xregs++;
} else if (proto->res_types[i] == MIR_T_D && n_xregs < 2) {
new_insn = MIR_new_insn (ctx, MIR_DMOV, ret_reg_op,
_MIR_new_var_op (ctx, n_xregs == 0 ? XMM0_HARD_REG : XMM1_HARD_REG));
n_xregs++;
} else if (proto->res_types[i] == MIR_T_LD && n_fregs < 2) {
new_insn = MIR_new_insn (ctx, MIR_LDMOV, ret_reg_op,
_MIR_new_var_op (ctx, n_fregs == 0 ? ST0_HARD_REG : ST1_HARD_REG));
n_fregs++;
} else if (n_iregs < 2) {
new_insn = MIR_new_insn (ctx, MIR_MOV, ret_reg_op,
_MIR_new_var_op (ctx, n_iregs == 0 ? AX_HARD_REG : DX_HARD_REG));
n_iregs++;
} else {
(*MIR_get_error_func (ctx)) (MIR_ret_error,
"x86-64 can not handle this combination of return values");
}
MIR_insert_insn_after (ctx, curr_func_item, call_insn, new_insn);
call_insn->ops[i + 2] = new_insn->ops[1];
if ((ext_code = get_ext_code (proto->res_types[i])) != MIR_INVALID_INSN) {
MIR_insert_insn_after (ctx, curr_func_item, new_insn,
MIR_new_insn (ctx, ext_code, ret_reg_op, ret_reg_op));
new_insn = DLIST_NEXT (MIR_insn_t, new_insn);
}
create_new_bb_insns (gen_ctx, call_insn, DLIST_NEXT (MIR_insn_t, new_insn), call_insn);
}
#ifdef _WIN32
if (block_offset > arg_stack_size) arg_stack_size = block_offset;
#endif
if (arg_stack_size != 0) { /* allocate/deallocate stack for args passed on stack */
arg_stack_size = (arg_stack_size + 15) / 16 * 16; /* make it of several 16 bytes */
new_insn
= MIR_new_insn (ctx, MIR_SUB, _MIR_new_var_op (ctx, SP_HARD_REG),
_MIR_new_var_op (ctx, SP_HARD_REG), MIR_new_int_op (ctx, arg_stack_size));
MIR_insert_insn_after (ctx, curr_func_item, prev_call_insn, new_insn);
next_insn = DLIST_NEXT (MIR_insn_t, new_insn);
create_new_bb_insns (gen_ctx, prev_call_insn, next_insn, call_insn);
new_insn
= MIR_new_insn (ctx, MIR_ADD, _MIR_new_var_op (ctx, SP_HARD_REG),
_MIR_new_var_op (ctx, SP_HARD_REG), MIR_new_int_op (ctx, arg_stack_size));
MIR_insert_insn_after (ctx, curr_func_item, call_insn, new_insn);
next_insn = DLIST_NEXT (MIR_insn_t, new_insn);
create_new_bb_insns (gen_ctx, call_insn, next_insn, call_insn);
}
if (arg_stack_size != 0) prohibit_omitting_fp (gen_ctx);
}
static float mir_ui2f (uint64_t i) { return (float) i; }
static double mir_ui2d (uint64_t i) { return (double) i; }
static long double mir_ui2ld (uint64_t i) { return (long double) i; }
static int64_t mir_ld2i (long double ld) { return (int64_t) ld; }
static const char *UI2F = "mir.ui2f";
static const char *UI2D = "mir.ui2d";
static const char *UI2LD = "mir.ui2ld";
static const char *LD2I = "mir.ld2i";
static const char *UI2F_P = "mir.ui2f.p";
static const char *UI2D_P = "mir.ui2d.p";
static const char *UI2LD_P = "mir.ui2ld.p";
static const char *LD2I_P = "mir.ld2i.p";
static const char *VA_ARG_P = "mir.va_arg.p";
static const char *VA_ARG = "mir.va_arg";
static const char *VA_BLOCK_ARG_P = "mir.va_block_arg.p";
static const char *VA_BLOCK_ARG = "mir.va_block_arg";
static void get_builtin (gen_ctx_t gen_ctx, MIR_insn_code_t code, MIR_item_t *proto_item,
MIR_item_t *func_import_item) {
MIR_context_t ctx = gen_ctx->ctx;
MIR_type_t res_type;
*func_import_item = *proto_item = NULL; /* to remove uninitialized warning */
switch (code) {
case MIR_UI2F:
res_type = MIR_T_F;
*proto_item
= _MIR_builtin_proto (ctx, curr_func_item->module, UI2F_P, 1, &res_type, 1, MIR_T_I64, "v");
*func_import_item = _MIR_builtin_func (ctx, curr_func_item->module, UI2F, mir_ui2f);
break;
case MIR_UI2D:
res_type = MIR_T_D;
*proto_item
= _MIR_builtin_proto (ctx, curr_func_item->module, UI2D_P, 1, &res_type, 1, MIR_T_I64, "v");
*func_import_item = _MIR_builtin_func (ctx, curr_func_item->module, UI2D, mir_ui2d);
break;
case MIR_UI2LD:
res_type = MIR_T_LD;
*proto_item
= _MIR_builtin_proto (ctx, curr_func_item->module, UI2LD_P, 1, &res_type, 1, MIR_T_I64, "v");
*func_import_item = _MIR_builtin_func (ctx, curr_func_item->module, UI2LD, mir_ui2ld);
break;
case MIR_LD2I:
res_type = MIR_T_I64;
*proto_item
= _MIR_builtin_proto (ctx, curr_func_item->module, LD2I_P, 1, &res_type, 1, MIR_T_LD, "v");
*func_import_item = _MIR_builtin_func (ctx, curr_func_item->module, LD2I, mir_ld2i);
break;
case MIR_VA_ARG:
res_type = MIR_T_I64;
*proto_item = _MIR_builtin_proto (ctx, curr_func_item->module, VA_ARG_P, 1, &res_type, 2,
MIR_T_I64, "va", MIR_T_I64, "type");
*func_import_item = _MIR_builtin_func (ctx, curr_func_item->module, VA_ARG, va_arg_builtin);
break;
case MIR_VA_BLOCK_ARG:
*proto_item
= _MIR_builtin_proto (ctx, curr_func_item->module, VA_BLOCK_ARG_P, 0, NULL, 4, MIR_T_I64,
"res", MIR_T_I64, "va", MIR_T_I64, "size", MIR_T_I64, "ncase");
*func_import_item
= _MIR_builtin_func (ctx, curr_func_item->module, VA_BLOCK_ARG, va_block_arg_builtin);
break;
default: assert (FALSE);
}
}
struct insn_pattern_info {
int start, num;
};
typedef struct insn_pattern_info insn_pattern_info_t;
DEF_VARR (insn_pattern_info_t);
struct const_ref {
int call_p; /* flag that constant from call insn */
MIR_item_t func_item; /* non-null for constant representing reference to func item */
size_t pc; /* where rel32 address should be in code */
size_t next_insn_disp; /* displacement of the next insn */
size_t const_num;
};
typedef struct const_ref const_ref_t;
DEF_VARR (const_ref_t);
struct label_ref {
char abs_addr_p, short_p; /* 8 or 32-bit target */
size_t label_val_disp, next_insn_disp;
union {
MIR_label_t label;
void *jump_addr; /* absolute addr for BBV */
} u;
};
typedef struct label_ref label_ref_t;
DEF_VARR (label_ref_t);
#define MOVDQA_CODE 0
struct call_ref {
MIR_item_t ref_func_item; /* func where the ref is located and referenced func */
uint8_t *call_addr; /* addr of rex call disp32(rip) or call *disp32(rip) */
};
typedef struct call_ref call_ref_t;
DEF_VARR (call_ref_t);
struct target_ctx {
unsigned char alloca_p, block_arg_func_p, leaf_p, keep_fp_p;
int start_sp_from_bp_offset;
MIR_insn_t temp_jump;
int temp_jump_pat_ind;
VARR (int) * pattern_indexes, *insn_pattern_indexes;
VARR (insn_pattern_info_t) * insn_pattern_info;
VARR (uint8_t) * result_code;
VARR (uint64_t) * const_pool;
VARR (const_ref_t) * const_refs;
VARR (label_ref_t) * label_refs;
VARR (uint64_t) * abs_address_locs;
VARR (MIR_code_reloc_t) * relocs;
VARR (call_ref_t) * call_refs;
};
#define alloca_p gen_ctx->target_ctx->alloca_p
#define block_arg_func_p gen_ctx->target_ctx->block_arg_func_p
#define leaf_p gen_ctx->target_ctx->leaf_p
#define keep_fp_p gen_ctx->target_ctx->keep_fp_p
#define start_sp_from_bp_offset gen_ctx->target_ctx->start_sp_from_bp_offset
#define temp_jump gen_ctx->target_ctx->temp_jump
#define temp_jump_pat_ind gen_ctx->target_ctx->temp_jump_pat_ind
#define pattern_indexes gen_ctx->target_ctx->pattern_indexes
#define insn_pattern_indexes gen_ctx->target_ctx->insn_pattern_indexes
#define insn_pattern_info gen_ctx->target_ctx->insn_pattern_info
#define result_code gen_ctx->target_ctx->result_code
#define const_pool gen_ctx->target_ctx->const_pool
#define const_refs gen_ctx->target_ctx->const_refs
#define label_refs gen_ctx->target_ctx->label_refs
#define abs_address_locs gen_ctx->target_ctx->abs_address_locs
#define relocs gen_ctx->target_ctx->relocs
static void prohibit_omitting_fp (gen_ctx_t gen_ctx) { keep_fp_p = TRUE; }
static MIR_disp_t target_get_stack_slot_offset (gen_ctx_t gen_ctx, MIR_type_t type,
MIR_reg_t slot) {
/* slot is 0, 1, ... */
if (keep_fp_p)
return -((MIR_disp_t) (slot + (type == MIR_T_LD ? 2 : 1)) * 8
+ (curr_func_item->u.func->vararg_p ? reg_save_area_size : 0));
return (MIR_disp_t) slot * 8;
}
static MIR_reg_t target_get_stack_slot_base_reg (gen_ctx_t gen_ctx) {
return keep_fp_p ? FP_HARD_REG : SP_HARD_REG;
}
static int target_valid_mem_offset_p (gen_ctx_t gen_ctx MIR_UNUSED, MIR_type_t type MIR_UNUSED,
MIR_disp_t offset MIR_UNUSED) {
return TRUE;
}
static void prepend_insn (gen_ctx_t gen_ctx, MIR_insn_t new_insn) {
MIR_prepend_insn (gen_ctx->ctx, curr_func_item, new_insn);
create_new_bb_insns (gen_ctx, NULL, DLIST_NEXT (MIR_insn_t, new_insn), NULL);
}
static void target_machinize (gen_ctx_t gen_ctx) {
MIR_context_t ctx = gen_ctx->ctx;
MIR_func_t func;
MIR_type_t type, mem_type, res_type;
MIR_insn_code_t code, new_insn_code;
MIR_insn_t insn, next_insn, new_insn;
MIR_reg_t ret_reg, arg_reg;
MIR_op_t ret_reg_op, arg_reg_op, mem_op, temp_op;
size_t i, blk_size, int_arg_num = 0, fp_arg_num = 0, mem_size = spill_space_size;
assert (curr_func_item->item_type == MIR_func_item);
func = curr_func_item->u.func;
block_arg_func_p = FALSE;
start_sp_from_bp_offset = 8;
keep_fp_p = func->vararg_p;
for (i = 0; i < func->nargs; i++) {
/* Argument extensions is already done in simplify */
/* Prologue: generate arg_var = hard_reg|stack mem|stack addr ... */
type = VARR_GET (MIR_var_t, func->vars, i).type;
blk_size = MIR_blk_type_p (type) ? (VARR_GET (MIR_var_t, func->vars, i).size + 7) / 8 * 8 : 0;
#ifndef _WIN32
if ((type == MIR_T_BLK + 1 && get_int_arg_reg (int_arg_num) != MIR_NON_VAR
&& (blk_size <= 8 || get_int_arg_reg (int_arg_num + 1) != MIR_NON_VAR))
|| (type == MIR_T_BLK + 2 && get_fp_arg_reg (fp_arg_num) != MIR_NON_VAR
&& (blk_size <= 8 || get_fp_arg_reg (fp_arg_num + 1) != MIR_NON_VAR))) {
/* all is passed in gprs or fprs */
MIR_type_t mov_type = type == MIR_T_BLK + 1 ? MIR_T_I64 : MIR_T_D;
MIR_insn_code_t mov_code1, mov_code2;
MIR_reg_t reg2, reg1 = get_arg_reg (mov_type, &int_arg_num, &fp_arg_num, &mov_code1);
assert (blk_size <= 16);
if (blk_size > 8) {
reg2 = get_arg_reg (mov_type, &int_arg_num, &fp_arg_num, &mov_code2);
new_insn = MIR_new_insn (ctx, mov_code1,
_MIR_new_var_mem_op (ctx, mov_type, 8, i + MAX_HARD_REG + 1,
MIR_NON_VAR, 1),
_MIR_new_var_op (ctx, reg2));
prepend_insn (gen_ctx, new_insn);
}
new_insn = MIR_new_insn (ctx, mov_code1,
_MIR_new_var_mem_op (ctx, mov_type, 0, i + MAX_HARD_REG + 1,
MIR_NON_VAR, 1),
_MIR_new_var_op (ctx, reg1));
prepend_insn (gen_ctx, new_insn);
new_insn = MIR_new_insn (ctx, MIR_ALLOCA, _MIR_new_var_op (ctx, i + MAX_HARD_REG + 1),
MIR_new_int_op (ctx, blk_size));
prepend_insn (gen_ctx, new_insn);
continue;
} else if ((type == MIR_T_BLK + 3 || type == MIR_T_BLK + 4)
&& get_int_arg_reg (int_arg_num) != MIR_NON_VAR
&& get_fp_arg_reg (fp_arg_num) != MIR_NON_VAR) {
/* gpr and then fpr or fpr and then gpr */
MIR_type_t mov_type1 = type == MIR_T_BLK + 3 ? MIR_T_I64 : MIR_T_D;
MIR_type_t mov_type2 = type == MIR_T_BLK + 3 ? MIR_T_D : MIR_T_I64;
MIR_insn_code_t mov_code1, mov_code2;
MIR_reg_t reg1 = get_arg_reg (mov_type1, &int_arg_num, &fp_arg_num, &mov_code1);
MIR_reg_t reg2 = get_arg_reg (mov_type2, &int_arg_num, &fp_arg_num, &mov_code2);
assert (blk_size > 8 && blk_size <= 16);
new_insn = MIR_new_insn (ctx, mov_code2,
_MIR_new_var_mem_op (ctx, mov_type2, 8, i + MAX_HARD_REG + 1,
MIR_NON_VAR, 1),
_MIR_new_var_op (ctx, reg2));
prepend_insn (gen_ctx, new_insn);
new_insn = MIR_new_insn (ctx, mov_code1,
_MIR_new_var_mem_op (ctx, mov_type1, 0, i + MAX_HARD_REG + 1,
MIR_NON_VAR, 1),
_MIR_new_var_op (ctx, reg1));
prepend_insn (gen_ctx, new_insn);
new_insn = MIR_new_insn (ctx, MIR_ALLOCA, _MIR_new_var_op (ctx, i + MAX_HARD_REG + 1),
MIR_new_int_op (ctx, blk_size));
prepend_insn (gen_ctx, new_insn);
continue;
}
#endif
int blk_p = MIR_blk_type_p (type);
#ifdef _WIN32
if (blk_p && blk_size > 8) { /* just address */
blk_p = FALSE;
type = MIR_T_I64;
}
#endif
if (blk_p) {
keep_fp_p = block_arg_func_p = TRUE;
#ifdef _WIN32
assert (blk_size <= 8);
if ((arg_reg = get_arg_reg (MIR_T_I64, &int_arg_num, &fp_arg_num, &new_insn_code))
== MIR_NON_VAR) {
new_insn
= MIR_new_insn (ctx, MIR_ADD, _MIR_new_var_op (ctx, (MIR_reg_t) (i + MAX_HARD_REG + 1)),
_MIR_new_var_op (ctx, FP_HARD_REG),
MIR_new_int_op (ctx, mem_size + 8 /* ret */
+ start_sp_from_bp_offset));
mem_size += 8;
} else { /* put reg into spill space and use its address: prepend in reverse order: */
int disp = (int) (mem_size + 8 /* ret */ + start_sp_from_bp_offset - spill_space_size
+ 8 * get_int_arg_reg_num (arg_reg));
new_insn
= MIR_new_insn (ctx, MIR_ADD, _MIR_new_var_op (ctx, (MIR_reg_t) (i + MAX_HARD_REG + 1)),
_MIR_new_var_op (ctx, FP_HARD_REG), MIR_new_int_op (ctx, disp));
prepend_insn (gen_ctx, new_insn);
arg_reg_op = _MIR_new_var_op (ctx, arg_reg);
mem_op = _MIR_new_var_mem_op (ctx, MIR_T_I64, disp, FP_HARD_REG, MIR_NON_VAR, 1);
new_insn = MIR_new_insn (ctx, MIR_MOV, mem_op, arg_reg_op);
}
#else
new_insn = MIR_new_insn (ctx, MIR_ADD, _MIR_new_var_op (ctx, i + MAX_HARD_REG + 1),
_MIR_new_var_op (ctx, FP_HARD_REG),
MIR_new_int_op (ctx, mem_size + 8 /* ret addr */
+ start_sp_from_bp_offset));
mem_size += blk_size;
#endif
prepend_insn (gen_ctx, new_insn);
} else if ((arg_reg = get_arg_reg (type, &int_arg_num, &fp_arg_num, &new_insn_code))
!= MIR_NON_VAR) {
arg_reg_op = _MIR_new_var_op (ctx, arg_reg);
new_insn
= MIR_new_insn (ctx, new_insn_code,
_MIR_new_var_op (ctx, (MIR_reg_t) (i + MAX_HARD_REG + 1)), arg_reg_op);
prepend_insn (gen_ctx, new_insn);
} else {
/* arg is on the stack */
keep_fp_p = block_arg_func_p = TRUE;
mem_type = type == MIR_T_F || type == MIR_T_D || type == MIR_T_LD ? type : MIR_T_I64;
new_insn_code = (type == MIR_T_F ? MIR_FMOV
: type == MIR_T_D ? MIR_DMOV
: type == MIR_T_LD ? MIR_LDMOV
: MIR_MOV);
mem_op = _MIR_new_var_mem_op (ctx, mem_type,
mem_size + 8 /* ret */
+ start_sp_from_bp_offset,
FP_HARD_REG, MIR_NON_VAR, 1);
new_insn = MIR_new_insn (ctx, new_insn_code,
_MIR_new_var_op (ctx, (MIR_reg_t) (i + MAX_HARD_REG + 1)), mem_op);
prepend_insn (gen_ctx, new_insn);
mem_size += type == MIR_T_LD ? 16 : 8;
}
}
alloca_p = FALSE;
leaf_p = TRUE;
for (insn = DLIST_HEAD (MIR_insn_t, func->insns); insn != NULL; insn = next_insn) {
next_insn = DLIST_NEXT (MIR_insn_t, insn);
code = insn->code;
switch (code) {
case MIR_UI2F:
case MIR_UI2D:
case MIR_UI2LD:
case MIR_LD2I: {
/* Use a builtin func call: mov freg, func ref; call proto, freg, res_reg, op_reg */
MIR_item_t proto_item, func_import_item;
MIR_op_t freg_op, res_reg_op = insn->ops[0], op_reg_op = insn->ops[1], ops[4];
get_builtin (gen_ctx, code, &proto_item, &func_import_item);
assert (res_reg_op.mode == MIR_OP_VAR && op_reg_op.mode == MIR_OP_VAR);
freg_op
= _MIR_new_var_op (ctx, gen_new_temp_reg (gen_ctx, MIR_T_I64, curr_func_item->u.func));
next_insn = new_insn
= MIR_new_insn (ctx, MIR_MOV, freg_op, MIR_new_ref_op (ctx, func_import_item));
gen_add_insn_before (gen_ctx, insn, new_insn);
ops[0] = MIR_new_ref_op (ctx, proto_item);
ops[1] = freg_op;
ops[2] = res_reg_op;
ops[3] = op_reg_op;
new_insn = MIR_new_insn_arr (ctx, MIR_CALL, 4, ops);
gen_add_insn_before (gen_ctx, insn, new_insn);
gen_delete_insn (gen_ctx, insn);
break;
}
case MIR_VA_START: {
MIR_op_t treg_op
= _MIR_new_var_op (ctx, gen_new_temp_reg (gen_ctx, MIR_T_I64, curr_func_item->u.func));
MIR_op_t va_op = insn->ops[0];
MIR_reg_t va_reg;
#ifndef _WIN32
int gp_offset = 0, fp_offset = 48, mem_offset = 0;
MIR_var_t var;
assert (func->vararg_p && va_op.mode == MIR_OP_VAR);
for (uint32_t narg = 0; narg < func->nargs; narg++) {
var = VARR_GET (MIR_var_t, func->vars, narg);
if (var.type == MIR_T_F || var.type == MIR_T_D) {
fp_offset += 16;
if (gp_offset >= 176) mem_offset += 8;
} else if (var.type == MIR_T_LD) {
mem_offset += 16;
} else if (MIR_blk_type_p (var.type)) {
mem_offset += var.size;
} else { /* including RBLK */
gp_offset += 8;
if (gp_offset >= 48) mem_offset += 8;
}
}
va_reg = va_op.u.var;
/* Insns can be not simplified as soon as they match a machine insn. */
/* mem32[va_reg] = gp_offset; mem32[va_reg] = fp_offset */
gen_mov (gen_ctx, insn, MIR_MOV,
_MIR_new_var_mem_op (ctx, MIR_T_U32, 0, va_reg, MIR_NON_VAR, 1),
MIR_new_int_op (ctx, gp_offset));
next_insn = DLIST_PREV (MIR_insn_t, insn);
gen_mov (gen_ctx, insn, MIR_MOV,
_MIR_new_var_mem_op (ctx, MIR_T_U32, 4, va_reg, MIR_NON_VAR, 1),
MIR_new_int_op (ctx, fp_offset));
/* overflow_arg_area_reg: treg = start sp + 8 + mem_offset; mem64[va_reg + 8] = treg */
new_insn
= MIR_new_insn (ctx, MIR_ADD, treg_op, _MIR_new_var_op (ctx, FP_HARD_REG),
MIR_new_int_op (ctx, 8 /*ret*/ + mem_offset + start_sp_from_bp_offset));
gen_add_insn_before (gen_ctx, insn, new_insn);
gen_mov (gen_ctx, insn, MIR_MOV,
_MIR_new_var_mem_op (ctx, MIR_T_I64, 8, va_reg, MIR_NON_VAR, 1), treg_op);
/* reg_save_area: treg = start sp - reg_save_area_size; mem64[va_reg + 16] = treg */
new_insn = MIR_new_insn (ctx, MIR_ADD, treg_op, _MIR_new_var_op (ctx, FP_HARD_REG),
MIR_new_int_op (ctx, -reg_save_area_size));
gen_add_insn_before (gen_ctx, insn, new_insn);
gen_mov (gen_ctx, insn, MIR_MOV,
_MIR_new_var_mem_op (ctx, MIR_T_I64, 16, va_reg, MIR_NON_VAR, 1), treg_op);
#else
/* init va_list */
mem_size = 8 /*ret*/ + start_sp_from_bp_offset + func->nargs * 8;
new_insn = MIR_new_insn (ctx, MIR_ADD, treg_op, _MIR_new_var_op (ctx, FP_HARD_REG),
MIR_new_int_op (ctx, mem_size));
gen_add_insn_before (gen_ctx, insn, new_insn);
va_reg = va_op.u.var;
gen_mov (gen_ctx, insn, MIR_MOV,
_MIR_new_var_mem_op (ctx, MIR_T_I64, 0, va_reg, MIR_NON_VAR, 1), treg_op);
#endif
gen_delete_insn (gen_ctx, insn);
break;
}
case MIR_VA_END: /* do nothing */ gen_delete_insn (gen_ctx, insn); break;
case MIR_VA_ARG:
case MIR_VA_BLOCK_ARG: {
/* Use a builtin func call:
mov func_reg, func ref; [mov reg3, type;] call proto, func_reg, res_reg, va_reg,
reg3 */
MIR_item_t proto_item, func_import_item;
MIR_op_t ops[6], func_reg_op, reg_op3;
MIR_op_t res_reg_op = insn->ops[0], va_reg_op = insn->ops[1], op3 = insn->ops[2];
get_builtin (gen_ctx, code, &proto_item, &func_import_item);
assert (res_reg_op.mode == MIR_OP_VAR && va_reg_op.mode == MIR_OP_VAR
&& op3.mode == (code == MIR_VA_ARG ? MIR_OP_VAR_MEM : MIR_OP_VAR));
func_reg_op = _MIR_new_var_op (ctx, gen_new_temp_reg (gen_ctx, MIR_T_I64, func));
reg_op3 = _MIR_new_var_op (ctx, gen_new_temp_reg (gen_ctx, MIR_T_I64, func));
next_insn = new_insn
= MIR_new_insn (ctx, MIR_MOV, func_reg_op, MIR_new_ref_op (ctx, func_import_item));
gen_add_insn_before (gen_ctx, insn, new_insn);
if (code == MIR_VA_ARG) {
new_insn = MIR_new_insn (ctx, MIR_MOV, reg_op3,
MIR_new_int_op (ctx, (int64_t) op3.u.var_mem.type));
op3 = reg_op3;
gen_add_insn_before (gen_ctx, insn, new_insn);
}
ops[0] = MIR_new_ref_op (ctx, proto_item);
ops[1] = func_reg_op;
ops[2] = res_reg_op;
ops[3] = va_reg_op;
ops[4] = op3;
if (code == MIR_VA_BLOCK_ARG) ops[5] = insn->ops[3];
new_insn = MIR_new_insn_arr (ctx, MIR_CALL, code == MIR_VA_ARG ? 5 : 6, ops);
gen_add_insn_before (gen_ctx, insn, new_insn);
gen_delete_insn (gen_ctx, insn);
break;
}
case MIR_ALLOCA: keep_fp_p = alloca_p = TRUE; break;
case MIR_RET: {
/* In simplify we already transformed code for one return insn
and added extension in return (if any). */
uint32_t n_iregs = 0, n_xregs = 0, n_fregs = 0;
#ifdef _WIN32
if (curr_func_item->u.func->nres > 1)
(*MIR_get_error_func (ctx)) (MIR_ret_error,
"Windows x86-64 doesn't support multiple return values");
#endif
assert (curr_func_item->u.func->nres == MIR_insn_nops (ctx, insn));
for (size_t nres = 0; nres < curr_func_item->u.func->nres; nres++) {
res_type = curr_func_item->u.func->res_types[nres];
if ((res_type == MIR_T_F || res_type == MIR_T_D) && n_xregs < 2) {
new_insn_code = res_type == MIR_T_F ? MIR_FMOV : MIR_DMOV;
ret_reg = n_xregs++ == 0 ? XMM0_HARD_REG : XMM1_HARD_REG;
} else if (res_type == MIR_T_LD && n_fregs < 2) { // ???
new_insn_code = MIR_LDMOV;
ret_reg = n_fregs == 0 ? ST0_HARD_REG : ST1_HARD_REG;
n_fregs++;
} else if (n_iregs < 2) {
new_insn_code = MIR_MOV;
ret_reg = n_iregs++ == 0 ? AX_HARD_REG : DX_HARD_REG;
} else {
(*MIR_get_error_func (ctx)) (MIR_ret_error,
"x86-64 can not handle this combination of return values");
}
ret_reg_op = _MIR_new_var_op (ctx, ret_reg);
new_insn = MIR_new_insn (ctx, new_insn_code, ret_reg_op, insn->ops[nres]);
gen_add_insn_before (gen_ctx, insn, new_insn);
insn->ops[nres] = ret_reg_op;
}
break;
}
case MIR_LSH:
case MIR_RSH:
case MIR_URSH:
case MIR_LSHS:
case MIR_RSHS:
case MIR_URSHS: {
/* We can access only cl as shift register: */
MIR_op_t creg_op = _MIR_new_var_op (ctx, CX_HARD_REG);
new_insn = MIR_new_insn (ctx, MIR_MOV, creg_op, insn->ops[2]);
gen_add_insn_before (gen_ctx, insn, new_insn);
insn->ops[2] = creg_op;
break;
}
case MIR_UMULO: