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MIPS: Don't use argument GPRs to rematerialize FPR arguments.

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This commit is contained in:
Mike Pall 2012-08-19 18:44:29 +02:00
parent ceaa60c0c7
commit 1fef2df3e8
1 changed files with 20 additions and 11 deletions
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31
src/lj_asm_mips.h
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@ -227,9 +227,12 @@ static void asm_gencall(ASMState *as, const CCallInfo *ci, IRRef *args)
{ {
uint32_t n, nargs = CCI_NARGS(ci); uint32_t n, nargs = CCI_NARGS(ci);
int32_t ofs = 16; int32_t ofs = 16;
Reg gpr = REGARG_FIRSTGPR, fpr = REGARG_FIRSTFPR; Reg gpr, fpr = REGARG_FIRSTFPR;
if ((void *)ci->func) if ((void *)ci->func)
emit_call(as, (void *)ci->func); emit_call(as, (void *)ci->func);
for (gpr = REGARG_FIRSTGPR; gpr <= REGARG_LASTGPR; gpr++)
as->cost[gpr] = REGCOST(~0u, 0u);
gpr = REGARG_FIRSTGPR;
for (n = 0; n < nargs; n++) { /* Setup args. */ for (n = 0; n < nargs; n++) { /* Setup args. */
IRRef ref = args[n]; IRRef ref = args[n];
if (ref) { if (ref) {
@ -245,16 +248,22 @@ static void asm_gencall(ASMState *as, const CCallInfo *ci, IRRef *args)
if (irt_isnum(ir->t)) gpr = (gpr+1) & ~1; if (irt_isnum(ir->t)) gpr = (gpr+1) & ~1;
if (gpr <= REGARG_LASTGPR) { if (gpr <= REGARG_LASTGPR) {
lua_assert(rset_test(as->freeset, gpr)); /* Already evicted. */ lua_assert(rset_test(as->freeset, gpr)); /* Already evicted. */
if (irt_isnum(ir->t)) { if (irt_isfp(ir->t)) {
Reg r = ra_alloc1(as, ref, RSET_FPR); RegSet of = as->freeset;
emit_tg(as, MIPSI_MFC1, gpr+(LJ_BE?0:1), r+1); Reg r;
emit_tg(as, MIPSI_MFC1, gpr+(LJ_BE?1:0), r); /* Workaround to protect argument GPRs from being used for remat. */
lua_assert(rset_test(as->freeset, gpr+1)); /* Already evicted. */ as->freeset &= ~RSET_RANGE(REGARG_FIRSTGPR, REGARG_LASTGPR+1);
gpr += 2; r = ra_alloc1(as, ref, RSET_FPR);
} else if (irt_isfloat(ir->t)) { as->freeset |= (of & RSET_RANGE(REGARG_FIRSTGPR, REGARG_LASTGPR+1));
Reg r = ra_alloc1(as, ref, RSET_FPR); if (irt_isnum(ir->t)) {
emit_tg(as, MIPSI_MFC1, gpr, r); emit_tg(as, MIPSI_MFC1, gpr+(LJ_BE?0:1), r+1);
gpr++; emit_tg(as, MIPSI_MFC1, gpr+(LJ_BE?1:0), r);
lua_assert(rset_test(as->freeset, gpr+1)); /* Already evicted. */
gpr += 2;
} else if (irt_isfloat(ir->t)) {
emit_tg(as, MIPSI_MFC1, gpr, r);
gpr++;
}
} else { } else {
ra_leftov(as, gpr, ref); ra_leftov(as, gpr, ref);
gpr++; gpr++;