forked from mia/Aegisub
239 lines
6.8 KiB
C
239 lines
6.8 KiB
C
/*
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** PPC instruction emitter.
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** Copyright (C) 2005-2017 Mike Pall. See Copyright Notice in luajit.h
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*/
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/* -- Emit basic instructions --------------------------------------------- */
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static void emit_tab(ASMState *as, PPCIns pi, Reg rt, Reg ra, Reg rb)
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{
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*--as->mcp = pi | PPCF_T(rt) | PPCF_A(ra) | PPCF_B(rb);
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}
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#define emit_asb(as, pi, ra, rs, rb) emit_tab(as, (pi), (rs), (ra), (rb))
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#define emit_as(as, pi, ra, rs) emit_tab(as, (pi), (rs), (ra), 0)
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#define emit_ab(as, pi, ra, rb) emit_tab(as, (pi), 0, (ra), (rb))
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static void emit_tai(ASMState *as, PPCIns pi, Reg rt, Reg ra, int32_t i)
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{
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*--as->mcp = pi | PPCF_T(rt) | PPCF_A(ra) | (i & 0xffff);
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}
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#define emit_ti(as, pi, rt, i) emit_tai(as, (pi), (rt), 0, (i))
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#define emit_ai(as, pi, ra, i) emit_tai(as, (pi), 0, (ra), (i))
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#define emit_asi(as, pi, ra, rs, i) emit_tai(as, (pi), (rs), (ra), (i))
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#define emit_fab(as, pi, rf, ra, rb) \
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emit_tab(as, (pi), (rf)&31, (ra)&31, (rb)&31)
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#define emit_fb(as, pi, rf, rb) emit_tab(as, (pi), (rf)&31, 0, (rb)&31)
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#define emit_fac(as, pi, rf, ra, rc) \
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emit_tab(as, (pi) | PPCF_C((rc) & 31), (rf)&31, (ra)&31, 0)
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#define emit_facb(as, pi, rf, ra, rc, rb) \
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emit_tab(as, (pi) | PPCF_C((rc) & 31), (rf)&31, (ra)&31, (rb)&31)
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#define emit_fai(as, pi, rf, ra, i) emit_tai(as, (pi), (rf)&31, (ra), (i))
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static void emit_rot(ASMState *as, PPCIns pi, Reg ra, Reg rs,
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int32_t n, int32_t b, int32_t e)
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{
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*--as->mcp = pi | PPCF_T(rs) | PPCF_A(ra) | PPCF_B(n) |
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PPCF_MB(b) | PPCF_ME(e);
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}
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static void emit_slwi(ASMState *as, Reg ra, Reg rs, int32_t n)
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{
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lua_assert(n >= 0 && n < 32);
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emit_rot(as, PPCI_RLWINM, ra, rs, n, 0, 31-n);
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}
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static void emit_rotlwi(ASMState *as, Reg ra, Reg rs, int32_t n)
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{
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lua_assert(n >= 0 && n < 32);
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emit_rot(as, PPCI_RLWINM, ra, rs, n, 0, 31);
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}
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/* -- Emit loads/stores --------------------------------------------------- */
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/* Prefer rematerialization of BASE/L from global_State over spills. */
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#define emit_canremat(ref) ((ref) <= REF_BASE)
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/* Try to find a one step delta relative to another constant. */
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static int emit_kdelta1(ASMState *as, Reg t, int32_t i)
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{
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RegSet work = ~as->freeset & RSET_GPR;
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while (work) {
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Reg r = rset_picktop(work);
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IRRef ref = regcost_ref(as->cost[r]);
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lua_assert(r != t);
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if (ref < ASMREF_L) {
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int32_t delta = i - (ra_iskref(ref) ? ra_krefk(as, ref) : IR(ref)->i);
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if (checki16(delta)) {
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emit_tai(as, PPCI_ADDI, t, r, delta);
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return 1;
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}
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}
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rset_clear(work, r);
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}
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return 0; /* Failed. */
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}
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/* Load a 32 bit constant into a GPR. */
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static void emit_loadi(ASMState *as, Reg r, int32_t i)
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{
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if (checki16(i)) {
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emit_ti(as, PPCI_LI, r, i);
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} else {
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if ((i & 0xffff)) {
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int32_t jgl = i32ptr(J2G(as->J));
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if ((uint32_t)(i-jgl) < 65536) {
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emit_tai(as, PPCI_ADDI, r, RID_JGL, i-jgl-32768);
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return;
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} else if (emit_kdelta1(as, r, i)) {
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return;
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}
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emit_asi(as, PPCI_ORI, r, r, i);
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}
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emit_ti(as, PPCI_LIS, r, (i >> 16));
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}
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}
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#define emit_loada(as, r, addr) emit_loadi(as, (r), i32ptr((addr)))
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static Reg ra_allock(ASMState *as, int32_t k, RegSet allow);
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/* Get/set from constant pointer. */
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static void emit_lsptr(ASMState *as, PPCIns pi, Reg r, void *p, RegSet allow)
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{
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int32_t jgl = i32ptr(J2G(as->J));
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int32_t i = i32ptr(p);
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Reg base;
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if ((uint32_t)(i-jgl) < 65536) {
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i = i-jgl-32768;
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base = RID_JGL;
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} else {
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base = ra_allock(as, i-(int16_t)i, allow);
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}
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emit_tai(as, pi, r, base, i);
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}
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#define emit_loadn(as, r, tv) \
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emit_lsptr(as, PPCI_LFD, ((r) & 31), (void *)(tv), RSET_GPR)
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/* Get/set global_State fields. */
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static void emit_lsglptr(ASMState *as, PPCIns pi, Reg r, int32_t ofs)
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{
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emit_tai(as, pi, r, RID_JGL, ofs-32768);
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}
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#define emit_getgl(as, r, field) \
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emit_lsglptr(as, PPCI_LWZ, (r), (int32_t)offsetof(global_State, field))
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#define emit_setgl(as, r, field) \
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emit_lsglptr(as, PPCI_STW, (r), (int32_t)offsetof(global_State, field))
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/* Trace number is determined from per-trace exit stubs. */
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#define emit_setvmstate(as, i) UNUSED(i)
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/* -- Emit control-flow instructions -------------------------------------- */
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/* Label for internal jumps. */
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typedef MCode *MCLabel;
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/* Return label pointing to current PC. */
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#define emit_label(as) ((as)->mcp)
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static void emit_condbranch(ASMState *as, PPCIns pi, PPCCC cc, MCode *target)
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{
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MCode *p = --as->mcp;
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ptrdiff_t delta = (char *)target - (char *)p;
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lua_assert(((delta + 0x8000) >> 16) == 0);
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pi ^= (delta & 0x8000) * (PPCF_Y/0x8000);
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*p = pi | PPCF_CC(cc) | ((uint32_t)delta & 0xffffu);
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}
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static void emit_jmp(ASMState *as, MCode *target)
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{
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MCode *p = --as->mcp;
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ptrdiff_t delta = (char *)target - (char *)p;
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*p = PPCI_B | (delta & 0x03fffffcu);
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}
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static void emit_call(ASMState *as, void *target)
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{
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MCode *p = --as->mcp;
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ptrdiff_t delta = (char *)target - (char *)p;
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if ((((delta>>2) + 0x00800000) >> 24) == 0) {
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*p = PPCI_BL | (delta & 0x03fffffcu);
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} else { /* Target out of range: need indirect call. Don't use arg reg. */
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RegSet allow = RSET_GPR & ~RSET_RANGE(RID_R0, REGARG_LASTGPR+1);
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Reg r = ra_allock(as, i32ptr(target), allow);
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*p = PPCI_BCTRL;
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p[-1] = PPCI_MTCTR | PPCF_T(r);
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as->mcp = p-1;
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}
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}
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/* -- Emit generic operations --------------------------------------------- */
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#define emit_mr(as, dst, src) \
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emit_asb(as, PPCI_MR, (dst), (src), (src))
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/* Generic move between two regs. */
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static void emit_movrr(ASMState *as, IRIns *ir, Reg dst, Reg src)
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{
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UNUSED(ir);
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if (dst < RID_MAX_GPR)
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emit_mr(as, dst, src);
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else
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emit_fb(as, PPCI_FMR, dst, src);
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}
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/* Generic load of register from stack slot. */
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static void emit_spload(ASMState *as, IRIns *ir, Reg r, int32_t ofs)
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{
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if (r < RID_MAX_GPR)
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emit_tai(as, PPCI_LWZ, r, RID_SP, ofs);
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else
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emit_fai(as, irt_isnum(ir->t) ? PPCI_LFD : PPCI_LFS, r, RID_SP, ofs);
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}
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/* Generic store of register to stack slot. */
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static void emit_spstore(ASMState *as, IRIns *ir, Reg r, int32_t ofs)
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{
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if (r < RID_MAX_GPR)
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emit_tai(as, PPCI_STW, r, RID_SP, ofs);
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else
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emit_fai(as, irt_isnum(ir->t) ? PPCI_STFD : PPCI_STFS, r, RID_SP, ofs);
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}
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/* Emit a compare (for equality) with a constant operand. */
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static void emit_cmpi(ASMState *as, Reg r, int32_t k)
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{
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if (checki16(k)) {
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emit_ai(as, PPCI_CMPWI, r, k);
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} else if (checku16(k)) {
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emit_ai(as, PPCI_CMPLWI, r, k);
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} else {
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emit_ai(as, PPCI_CMPLWI, RID_TMP, k);
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emit_asi(as, PPCI_XORIS, RID_TMP, r, (k >> 16));
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}
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}
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/* Add offset to pointer. */
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static void emit_addptr(ASMState *as, Reg r, int32_t ofs)
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{
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if (ofs) {
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emit_tai(as, PPCI_ADDI, r, r, ofs);
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if (!checki16(ofs))
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emit_tai(as, PPCI_ADDIS, r, r, (ofs + 32768) >> 16);
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}
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}
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static void emit_spsub(ASMState *as, int32_t ofs)
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{
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if (ofs) {
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emit_tai(as, PPCI_STWU, RID_TMP, RID_SP, -ofs);
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emit_tai(as, PPCI_ADDI, RID_TMP, RID_SP,
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CFRAME_SIZE + (as->parent ? as->parent->spadjust : 0));
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}
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}
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