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String buffers, part 3d: Compile string buffer methods and functions.

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Sponsored by fmad.io.
This commit is contained in:
Mike Pall
2021-07-19 16:53:30 +02:00
parent 2182630903
commit 29bc1f04ac
18 changed files with 625 additions and 87 deletions
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28
src/lj_opt_mem.c
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@@ -620,8 +620,9 @@ TRef LJ_FASTCALL lj_opt_dse_fstore(jit_State *J)
goto doemit;
break; /* Otherwise continue searching. */
case ALIAS_MUST:
if (store->op2 == val) /* Same value: drop the new store. */
return DROPFOLD;
if (store->op2 == val &&
!(xr->op2 >= IRFL_SBUF_W && xr->op2 <= IRFL_SBUF_R))
return DROPFOLD; /* Same value: drop the new store. */
/* Different value: try to eliminate the redundant store. */
if (ref > J->chain[IR_LOOP]) { /* Quick check to avoid crossing LOOP. */
IRIns *ir;
@@ -642,6 +643,29 @@ doemit:
return EMITFOLD; /* Otherwise we have a conflict or simply no match. */
}
/* Check whether there's no aliasing buffer op between IRFL_SBUF_*. */
int LJ_FASTCALL lj_opt_fwd_sbuf(jit_State *J, IRRef lim)
{
IRRef ref;
if (J->chain[IR_BUFPUT] > lim)
return 0; /* Conflict. */
ref = J->chain[IR_CALLS];
while (ref > lim) {
IRIns *ir = IR(ref);
if (ir->op2 >= IRCALL_lj_strfmt_putint && ir->op2 < IRCALL_lj_buf_tostr)
return 0; /* Conflict. */
ref = ir->prev;
}
ref = J->chain[IR_CALLL];
while (ref > lim) {
IRIns *ir = IR(ref);
if (ir->op2 >= IRCALL_lj_strfmt_putint && ir->op2 < IRCALL_lj_buf_tostr)
return 0; /* Conflict. */
ref = ir->prev;
}
return 1; /* No conflict. Can safely FOLD/CSE. */
}
/* -- XLOAD forwarding and XSTORE elimination ----------------------------- */
/* Find cdata allocation for a reference (if any). */