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Use some register allocator helpers for multiple architectures.

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This commit is contained in:
Mike Pall 2011-09-05 20:23:20 +02:00
parent ae3317b186
commit 1b949dc60a
2 changed files with 70 additions and 67 deletions
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70
src/lj_asm.c
View File

@ -678,6 +678,76 @@ static void ra_left(ASMState *as, Reg dest, IRRef lref)
}
}
}
#else
/* Similar to ra_left, except we override any hints. */
static void ra_leftov(ASMState *as, Reg dest, IRRef lref)
{
IRIns *ir = IR(lref);
Reg left = ir->r;
if (ra_noreg(left)) {
ra_sethint(ir->r, dest); /* Propagate register hint. */
left = ra_allocref(as, lref,
(LJ_SOFTFP || dest < RID_MAX_GPR) ? RSET_GPR : RSET_FPR);
}
ra_noweak(as, left);
if (dest != left) {
/* Use register renaming if dest is the PHI reg. */
if (irt_isphi(ir->t) && as->phireg[dest] == lref) {
ra_modified(as, left);
ra_rename(as, left, dest);
} else {
emit_movrr(as, ir, dest, left);
}
}
}
#endif
#if !LJ_TARGET_X86ORX64
/* Force a RID_RET/RID_RETHI destination register pair (marked as free). */
static void ra_destpair(ASMState *as, IRIns *ir)
{
Reg destlo = ir->r, desthi = (ir+1)->r;
/* First spill unrelated refs blocking the destination registers. */
if (!rset_test(as->freeset, RID_RET) &&
destlo != RID_RET && desthi != RID_RET)
ra_restore(as, regcost_ref(as->cost[RID_RET]));
if (!rset_test(as->freeset, RID_RETHI) &&
destlo != RID_RETHI && desthi != RID_RETHI)
ra_restore(as, regcost_ref(as->cost[RID_RETHI]));
/* Next free the destination registers (if any). */
if (ra_hasreg(destlo)) {
ra_free(as, destlo);
ra_modified(as, destlo);
} else {
destlo = RID_RET;
}
if (ra_hasreg(desthi)) {
ra_free(as, desthi);
ra_modified(as, desthi);
} else {
desthi = RID_RETHI;
}
/* Check for conflicts and shuffle the registers as needed. */
if (destlo == RID_RETHI) {
if (desthi == RID_RET) {
emit_movrr(as, ir, RID_RETHI, RID_TMP);
emit_movrr(as, ir, RID_RET, RID_RETHI);
emit_movrr(as, ir, RID_TMP, RID_RET);
} else {
emit_movrr(as, ir, RID_RETHI, RID_RET);
if (desthi != RID_RETHI) emit_movrr(as, ir, desthi, RID_RETHI);
}
} else if (desthi == RID_RET) {
emit_movrr(as, ir, RID_RET, RID_RETHI);
if (destlo != RID_RET) emit_movrr(as, ir, destlo, RID_RET);
} else {
if (desthi != RID_RETHI) emit_movrr(as, ir, desthi, RID_RETHI);
if (destlo != RID_RET) emit_movrr(as, ir, destlo, RID_RET);
}
/* Restore spill slots (if any). */
if (ra_hasspill((ir+1)->s)) ra_save(as, ir+1, RID_RETHI);
if (ra_hasspill(ir->s)) ra_save(as, ir, RID_RET);
}
#endif
/* -- Snapshot handling --------- ----------------------------------------- */

67
src/lj_asm_arm.h
View File

@ -18,27 +18,6 @@ static Reg ra_hintalloc(ASMState *as, IRRef ref, Reg hint, RegSet allow)
return r;
}
/* Similar to ra_left, except we override any hints. */
static void ra_leftov(ASMState *as, Reg dest, IRRef lref)
{
IRIns *ir = IR(lref);
Reg left = ir->r;
if (ra_noreg(left)) {
ra_sethint(ir->r, dest); /* Propagate register hint. */
left = ra_allocref(as, lref, RSET_GPR);
}
ra_noweak(as, left);
if (dest != left) {
/* Use register renaming if dest is the PHI reg. */
if (irt_isphi(ir->t) && as->phireg[dest] == lref) {
ra_modified(as, left);
ra_rename(as, left, dest);
} else {
emit_movrr(as, ir, dest, left);
}
}
}
/* Allocate a scratch register pair. */
static Reg ra_scratchpair(ASMState *as, RegSet allow)
{
@ -69,52 +48,6 @@ static Reg ra_scratchpair(ASMState *as, RegSet allow)
return r;
}
/* Force a RID_RET/RID_RETHI destination register pair (marked as free). */
static void ra_destpair(ASMState *as, IRIns *ir)
{
Reg destlo = ir->r, desthi = (ir+1)->r;
/* First spill unrelated refs blocking the destination registers. */
if (!rset_test(as->freeset, RID_RET) &&
destlo != RID_RET && desthi != RID_RET)
ra_restore(as, regcost_ref(as->cost[RID_RET]));
if (!rset_test(as->freeset, RID_RETHI) &&
destlo != RID_RETHI && desthi != RID_RETHI)
ra_restore(as, regcost_ref(as->cost[RID_RETHI]));
/* Next free the destination registers (if any). */
if (ra_hasreg(destlo)) {
ra_free(as, destlo);
ra_modified(as, destlo);
} else {
destlo = RID_RET;
}
if (ra_hasreg(desthi)) {
ra_free(as, desthi);
ra_modified(as, desthi);
} else {
desthi = RID_RETHI;
}
/* Check for conflicts and shuffle the registers as needed. */
if (destlo == RID_RETHI) {
if (desthi == RID_RET) {
emit_movrr(as, ir, RID_RETHI, RID_TMP);
emit_movrr(as, ir, RID_RET, RID_RETHI);
emit_movrr(as, ir, RID_TMP, RID_RET);
} else {
emit_movrr(as, ir, RID_RETHI, RID_RET);
if (desthi != RID_RETHI) emit_movrr(as, ir, desthi, RID_RETHI);
}
} else if (desthi == RID_RET) {
emit_movrr(as, ir, RID_RET, RID_RETHI);
if (destlo != RID_RET) emit_movrr(as, ir, destlo, RID_RET);
} else {
if (desthi != RID_RETHI) emit_movrr(as, ir, desthi, RID_RETHI);
if (destlo != RID_RET) emit_movrr(as, ir, destlo, RID_RET);
}
/* Restore spill slots (if any). */
if (ra_hasspill((ir+1)->s)) ra_save(as, ir+1, RID_RETHI);
if (ra_hasspill(ir->s)) ra_save(as, ir, RID_RET);
}
/* -- Guard handling ------------------------------------------------------ */
/* Generate an exit stub group at the bottom of the reserved MCode memory. */