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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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22
src/lj_emit_x86.h
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@@ -313,13 +313,23 @@ static void emit_loadu64(ASMState *as, Reg r, uint64_t u64)
}
#endif
/* movsd r, [&tv->n] / xorps r, r */
static void emit_loadn(ASMState *as, Reg r, cTValue *tv)
/* Load 64 bit IR constant into register. */
static void emit_loadk64(ASMState *as, Reg r, IRIns *ir)
{
if (tvispzero(tv)) /* Use xor only for +0. */
emit_rr(as, XO_XORPS, r, r);
else
emit_rma(as, XO_MOVSD, r, &tv->n);
const uint64_t *k = &ir_k64(ir)->u64;
if (rset_test(RSET_FPR, r)) {
if (*k == 0) {
emit_rr(as, XO_XORPS, r, r);
} else {
emit_rma(as, XO_MOVSD, r, k);
}
} else {
if (*k == 0) {
emit_rr(as, XO_ARITH(XOg_XOR), r, r);
} else {
emit_rma(as, XO_MOV, r | REX_64, k);
}
}
}
/* -- Emit control-flow instructions -------------------------------------- */