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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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26
src/lj_asm_x86.h
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@@ -306,6 +306,16 @@ static void asm_fusexref(ASMState *as, IRRef ref, RegSet allow)
}
}
/* Fuse load of 64 bit IR constant into memory operand. */
static Reg asm_fuseloadk64(ASMState *as, IRIns *ir)
{
const uint64_t *k = &ir_k64(ir)->u64;
as->mrm.ofs = ptr2addr(k);
as->mrm.base = RID_NONE;
as->mrm.idx = RID_NONE;
return RID_MRM;
}
/* Fuse load into memory operand. */
static Reg asm_fuseload(ASMState *as, IRRef ref, RegSet allow)
{
@@ -325,19 +335,13 @@ static Reg asm_fuseload(ASMState *as, IRRef ref, RegSet allow)
if (ir->o == IR_KNUM) {
RegSet avail = as->freeset & ~as->modset & RSET_FPR;
lua_assert(allow != RSET_EMPTY);
if (!(avail & (avail-1))) { /* Fuse if less than two regs available. */
as->mrm.ofs = ptr2addr(ir_knum(ir));
as->mrm.base = as->mrm.idx = RID_NONE;
return RID_MRM;
}
if (!(avail & (avail-1))) /* Fuse if less than two regs available. */
return asm_fuseloadk64(as, ir);
} else if (ir->o == IR_KINT64) {
RegSet avail = as->freeset & ~as->modset & RSET_GPR;
lua_assert(allow != RSET_EMPTY);
if (!(avail & (avail-1))) { /* Fuse if less than two regs available. */
as->mrm.ofs = ptr2addr(ir_kint64(ir));
as->mrm.base = as->mrm.idx = RID_NONE;
return RID_MRM;
}
if (!(avail & (avail-1))) /* Fuse if less than two regs available. */
return asm_fuseloadk64(as, ir);
} else if (mayfuse(as, ref)) {
RegSet xallow = (allow & RSET_GPR) ? allow : RSET_GPR;
if (ir->o == IR_SLOAD) {
@@ -711,7 +715,7 @@ static void asm_conv(ASMState *as, IRIns *ir)
emit_rr(as, XO_CVTSD2SS, dest, dest);
emit_rr(as, XO_SUBSD, dest, bias); /* Subtract 2^52+2^51 bias. */
emit_rr(as, XO_XORPS, dest, bias); /* Merge bias and integer. */
emit_loadn(as, bias, k);
emit_rma(as, XO_MOVSD, bias, k);
emit_mrm(as, XO_MOVD, dest, asm_fuseload(as, lref, RSET_GPR));
return;
} else { /* Integer to FP conversion. */