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Embed 64 bit constants directly in the IR, using two slots.

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Contributed by Peter Cawley.
This commit is contained in:
Mike Pall
2016-05-23 00:25:29 +02:00
parent a4067978b6
commit 7fb75ccc4c
17 changed files with 105 additions and 60 deletions
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17
src/lj_asm.c
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@@ -334,7 +334,7 @@ static Reg ra_rematk(ASMState *as, IRRef ref)
RA_DBGX((as, "remat $i $r", ir, r));
#if !LJ_SOFTFP
if (ir->o == IR_KNUM) {
emit_loadn(as, r, ir_knum(ir));
emit_loadk64(as, r, ir);
} else
#endif
if (emit_canremat(REF_BASE) && ir->o == IR_BASE) {
@@ -695,15 +695,14 @@ static void ra_left(ASMState *as, Reg dest, IRRef lref)
if (ra_noreg(left)) {
if (irref_isk(lref)) {
if (ir->o == IR_KNUM) {
cTValue *tv = ir_knum(ir);
/* FP remat needs a load except for +0. Still better than eviction. */
if (tvispzero(tv) || !(as->freeset & RSET_FPR)) {
emit_loadn(as, dest, tv);
if (tvispzero(ir_knum(ir)) || !(as->freeset & RSET_FPR)) {
emit_loadk64(as, dest, ir);
return;
}
#if LJ_64
} else if (ir->o == IR_KINT64) {
emit_loadu64(as, dest, ir_kint64(ir)->u64);
emit_loadk64(as, dest, ir);
return;
#endif
} else if (ir->o != IR_KPRI) {
@@ -1963,8 +1962,14 @@ static void asm_setup_regsp(ASMState *as)
ra_setup(as);
/* Clear reg/sp for constants. */
for (ir = IR(T->nk), lastir = IR(REF_BASE); ir < lastir; ir++)
for (ir = IR(T->nk), lastir = IR(REF_BASE); ir < lastir; ir++) {
ir->prev = REGSP_INIT;
if (irt_is64(ir->t) && ir->o != IR_KNULL) {
/* Make life easier for backends by putting address of constant in i. */
ir->i = (int32_t)(intptr_t)(ir+1);
ir++;
}
}
/* REF_BASE is used for implicit references to the BASE register. */
lastir->prev = REGSP_HINT(RID_BASE);