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Fuse string creation into concats. Optimize single-char concats.

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This commit is contained in:
Mike Pall
2013-04-23 00:56:03 +02:00
parent 2cdf90f068
commit 557391c3b7
4 changed files with 37 additions and 8 deletions
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29
src/lj_asm.c
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@@ -1058,14 +1058,22 @@ static void asm_bufhdr(ASMState *as, IRIns *ir)
static void asm_bufput(ASMState *as, IRIns *ir)
{
const CCallInfo *ci = &lj_ir_callinfo[IRCALL_lj_buf_putstr];
IRRef args[2];
IRRef args[3];
IRIns *irs;
int kchar = -1;
if (!ra_used(ir)) return;
args[0] = ir->op1; /* SBuf * */
args[1] = ir->op2; /* GCstr * */
irs = IR(ir->op2);
lua_assert(irt_isstr(irs->t));
if (mayfuse(as, ir->op2) && ra_noreg(irs->r)) {
if (irs->o == IR_KGC) {
GCstr *s = ir_kstr(irs);
if (s->len == 1) { /* Optimize put of single-char string constant. */
kchar = strdata(s)[0];
ci = &lj_ir_callinfo[IRCALL_lj_buf_putchar];
args[1] = ASMREF_TMP1; /* int, truncated to char */
}
} else if (mayfuse(as, ir->op2) && ra_noreg(irs->r)) {
if (irs->o == IR_TOSTR) { /* Fuse number to string conversions. */
if (LJ_SOFTFP ? (irs+1)->o == IR_HIOP : irt_isnum(IR(irs->op1)->t)) {
ci = &lj_ir_callinfo[IRCALL_lj_buf_putnum];
@@ -1075,12 +1083,21 @@ static void asm_bufput(ASMState *as, IRIns *ir)
ci = &lj_ir_callinfo[IRCALL_lj_buf_putint];
args[1] = irs->op1; /* int */
}
} else if (irs->o == IR_SNEW) { /* Fuse string allocation. */
ci = &lj_ir_callinfo[IRCALL_lj_buf_putmem];
args[1] = irs->op1; /* const void * */
args[2] = irs->op2; /* MSize */
}
}
asm_setupresult(as, ir, ci); /* SBuf * */
asm_gencall(as, ci, args);
if (args[1] == ASMREF_TMP1)
asm_tvptr(as, ra_releasetmp(as, ASMREF_TMP1), irs->op1);
if (args[1] == ASMREF_TMP1) {
Reg tmp = ra_releasetmp(as, ASMREF_TMP1);
if (kchar == -1)
asm_tvptr(as, tmp, irs->op1);
else
ra_allockreg(as, kchar, tmp);
}
}
static void asm_bufstr(ASMState *as, IRIns *ir)
@@ -2015,11 +2032,11 @@ static void asm_setup_regsp(ASMState *as)
/* fallthrough */
#endif
/* C calls evict all scratch regs and return results in RID_RET. */
case IR_SNEW: case IR_XSNEW: case IR_NEWREF:
case IR_SNEW: case IR_XSNEW: case IR_NEWREF: case IR_BUFPUT:
if (REGARG_NUMGPR < 3 && as->evenspill < 3)
as->evenspill = 3; /* lj_str_new and lj_tab_newkey need 3 args. */
case IR_TNEW: case IR_TDUP: case IR_CNEW: case IR_CNEWI: case IR_TOSTR:
case IR_BUFPUT: case IR_BUFSTR:
case IR_BUFSTR:
ir->prev = REGSP_HINT(RID_RET);
if (inloop)
as->modset = RSET_SCRATCH;