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/*
** PPC instruction emitter.
** Copyright (C) 2005-2022 Mike Pall. See Copyright Notice in luajit.h
*/
/* -- Emit basic instructions --------------------------------------------- */
static void emit_tab(ASMState *as, PPCIns pi, Reg rt, Reg ra, Reg rb)
{
*--as->mcp = pi | PPCF_T(rt) | PPCF_A(ra) | PPCF_B(rb);
}
#define emit_asb(as, pi, ra, rs, rb) emit_tab(as, (pi), (rs), (ra), (rb))
#define emit_as(as, pi, ra, rs) emit_tab(as, (pi), (rs), (ra), 0)
#define emit_ab(as, pi, ra, rb) emit_tab(as, (pi), 0, (ra), (rb))
static void emit_tai(ASMState *as, PPCIns pi, Reg rt, Reg ra, int32_t i)
{
*--as->mcp = pi | PPCF_T(rt) | PPCF_A(ra) | (i & 0xffff);
}
#define emit_ti(as, pi, rt, i) emit_tai(as, (pi), (rt), 0, (i))
#define emit_ai(as, pi, ra, i) emit_tai(as, (pi), 0, (ra), (i))
#define emit_asi(as, pi, ra, rs, i) emit_tai(as, (pi), (rs), (ra), (i))
#define emit_fab(as, pi, rf, ra, rb) \
emit_tab(as, (pi), (rf)&31, (ra)&31, (rb)&31)
#define emit_fb(as, pi, rf, rb) emit_tab(as, (pi), (rf)&31, 0, (rb)&31)
#define emit_fac(as, pi, rf, ra, rc) \
emit_tab(as, (pi) | PPCF_C((rc) & 31), (rf)&31, (ra)&31, 0)
#define emit_facb(as, pi, rf, ra, rc, rb) \
emit_tab(as, (pi) | PPCF_C((rc) & 31), (rf)&31, (ra)&31, (rb)&31)
#define emit_fai(as, pi, rf, ra, i) emit_tai(as, (pi), (rf)&31, (ra), (i))
static void emit_rot(ASMState *as, PPCIns pi, Reg ra, Reg rs,
int32_t n, int32_t b, int32_t e)
{
*--as->mcp = pi | PPCF_T(rs) | PPCF_A(ra) | PPCF_B(n) |
PPCF_MB(b) | PPCF_ME(e);
}
static void emit_slwi(ASMState *as, Reg ra, Reg rs, int32_t n)
{
lua_assert(n >= 0 && n < 32);
emit_rot(as, PPCI_RLWINM, ra, rs, n, 0, 31-n);
}
static void emit_rotlwi(ASMState *as, Reg ra, Reg rs, int32_t n)
{
lua_assert(n >= 0 && n < 32);
emit_rot(as, PPCI_RLWINM, ra, rs, n, 0, 31);
}
/* -- Emit loads/stores --------------------------------------------------- */
/* Prefer rematerialization of BASE/L from global_State over spills. */
#define emit_canremat(ref) ((ref) <= REF_BASE)
/* Try to find a one step delta relative to another constant. */
static int emit_kdelta1(ASMState *as, Reg t, int32_t i)
{
RegSet work = ~as->freeset & RSET_GPR;
while (work) {
Reg r = rset_picktop(work);
IRRef ref = regcost_ref(as->cost[r]);
lua_assert(r != t);
if (ref < ASMREF_L) {
int32_t delta = i - (ra_iskref(ref) ? ra_krefk(as, ref) : IR(ref)->i);
if (checki16(delta)) {
emit_tai(as, PPCI_ADDI, t, r, delta);
return 1;
}
}
rset_clear(work, r);
}
return 0; /* Failed. */
}
/* Load a 32 bit constant into a GPR. */
static void emit_loadi(ASMState *as, Reg r, int32_t i)
{
if (checki16(i)) {
emit_ti(as, PPCI_LI, r, i);
} else {
if ((i & 0xffff)) {
int32_t jgl = i32ptr(J2G(as->J));
if ((uint32_t)(i-jgl) < 65536) {
emit_tai(as, PPCI_ADDI, r, RID_JGL, i-jgl-32768);
return;
} else if (emit_kdelta1(as, r, i)) {
return;
}
emit_asi(as, PPCI_ORI, r, r, i);
}
emit_ti(as, PPCI_LIS, r, (i >> 16));
}
}
#define emit_loada(as, r, addr) emit_loadi(as, (r), i32ptr((addr)))
static Reg ra_allock(ASMState *as, int32_t k, RegSet allow);
/* Get/set from constant pointer. */
static void emit_lsptr(ASMState *as, PPCIns pi, Reg r, void *p, RegSet allow)
{
int32_t jgl = i32ptr(J2G(as->J));
int32_t i = i32ptr(p);
Reg base;
if ((uint32_t)(i-jgl) < 65536) {
i = i-jgl-32768;
base = RID_JGL;
} else {
base = ra_allock(as, i-(int16_t)i, allow);
}
emit_tai(as, pi, r, base, i);
}
#define emit_loadn(as, r, tv) \
emit_lsptr(as, PPCI_LFD, ((r) & 31), (void *)(tv), RSET_GPR)
/* Get/set global_State fields. */
static void emit_lsglptr(ASMState *as, PPCIns pi, Reg r, int32_t ofs)
{
emit_tai(as, pi, r, RID_JGL, ofs-32768);
}
#define emit_getgl(as, r, field) \
emit_lsglptr(as, PPCI_LWZ, (r), (int32_t)offsetof(global_State, field))
#define emit_setgl(as, r, field) \
emit_lsglptr(as, PPCI_STW, (r), (int32_t)offsetof(global_State, field))
/* Trace number is determined from per-trace exit stubs. */
#define emit_setvmstate(as, i) UNUSED(i)
/* -- Emit control-flow instructions -------------------------------------- */
/* Label for internal jumps. */
typedef MCode *MCLabel;
/* Return label pointing to current PC. */
#define emit_label(as) ((as)->mcp)
static void emit_condbranch(ASMState *as, PPCIns pi, PPCCC cc, MCode *target)
{
MCode *p = --as->mcp;
ptrdiff_t delta = (char *)target - (char *)p;
lua_assert(((delta + 0x8000) >> 16) == 0);
pi ^= (delta & 0x8000) * (PPCF_Y/0x8000);
*p = pi | PPCF_CC(cc) | ((uint32_t)delta & 0xffffu);
}
static void emit_jmp(ASMState *as, MCode *target)
{
MCode *p = --as->mcp;
ptrdiff_t delta = (char *)target - (char *)p;
*p = PPCI_B | (delta & 0x03fffffcu);
}
static void emit_call(ASMState *as, void *target)
{
MCode *p = --as->mcp;
ptrdiff_t delta = (char *)target - (char *)p;
if ((((delta>>2) + 0x00800000) >> 24) == 0) {
*p = PPCI_BL | (delta & 0x03fffffcu);
} else { /* Target out of range: need indirect call. Don't use arg reg. */
RegSet allow = RSET_GPR & ~RSET_RANGE(RID_R0, REGARG_LASTGPR+1);
Reg r = ra_allock(as, i32ptr(target), allow);
*p = PPCI_BCTRL;
p[-1] = PPCI_MTCTR | PPCF_T(r);
as->mcp = p-1;
}
}
/* -- Emit generic operations --------------------------------------------- */
#define emit_mr(as, dst, src) \
emit_asb(as, PPCI_MR, (dst), (src), (src))
/* Generic move between two regs. */
static void emit_movrr(ASMState *as, IRIns *ir, Reg dst, Reg src)
{
UNUSED(ir);
if (dst < RID_MAX_GPR)
emit_mr(as, dst, src);
else
emit_fb(as, PPCI_FMR, dst, src);
}
/* Generic load of register from stack slot. */
static void emit_spload(ASMState *as, IRIns *ir, Reg r, int32_t ofs)
{
if (r < RID_MAX_GPR)
emit_tai(as, PPCI_LWZ, r, RID_SP, ofs);
else
emit_fai(as, irt_isnum(ir->t) ? PPCI_LFD : PPCI_LFS, r, RID_SP, ofs);
}
/* Generic store of register to stack slot. */
static void emit_spstore(ASMState *as, IRIns *ir, Reg r, int32_t ofs)
{
if (r < RID_MAX_GPR)
emit_tai(as, PPCI_STW, r, RID_SP, ofs);
else
emit_fai(as, irt_isnum(ir->t) ? PPCI_STFD : PPCI_STFS, r, RID_SP, ofs);
}
/* Emit a compare (for equality) with a constant operand. */
static void emit_cmpi(ASMState *as, Reg r, int32_t k)
{
if (checki16(k)) {
emit_ai(as, PPCI_CMPWI, r, k);
} else if (checku16(k)) {
emit_ai(as, PPCI_CMPLWI, r, k);
} else {
emit_ai(as, PPCI_CMPLWI, RID_TMP, k);
emit_asi(as, PPCI_XORIS, RID_TMP, r, (k >> 16));
}
}
/* Add offset to pointer. */
static void emit_addptr(ASMState *as, Reg r, int32_t ofs)
{
if (ofs) {
emit_tai(as, PPCI_ADDI, r, r, ofs);
if (!checki16(ofs))
emit_tai(as, PPCI_ADDIS, r, r, (ofs + 32768) >> 16);
}
}
static void emit_spsub(ASMState *as, int32_t ofs)
{
if (ofs) {
emit_tai(as, PPCI_STWU, RID_TMP, RID_SP, -ofs);
emit_tai(as, PPCI_ADDI, RID_TMP, RID_SP,
CFRAME_SIZE + (as->parent ? as->parent->spadjust : 0));
}
}
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