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ARM: Simplify two-step constant rematerialization.

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Mike Pall 2012-07-02 22:57:51 +02:00
parent afeb4e2c51
commit 79e1eaa73b
1 changed files with 13 additions and 10 deletions
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23
src/lj_emit_arm.h
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@ -141,16 +141,19 @@ static int emit_kdelta2(ASMState *as, Reg d, int32_t i)
IRRef ref = regcost_ref(as->cost[r]);
lua_assert(r != d);
if (emit_canremat(ref)) {
int32_t delta = i - (ra_iskref(ref) ? ra_krefk(as, ref) : IR(ref)->i);
uint32_t sh, inv = 0, k2, k;
if (delta < 0) { delta = -delta; inv = ARMI_ADD^ARMI_SUB; }
sh = lj_ffs(delta) & ~1;
k2 = emit_isk12(0, delta & (255 << sh));
k = emit_isk12(0, delta & ~(255 << sh));
if (k) {
emit_dn(as, ARMI_ADD^k2^inv, d, d);
emit_dn(as, ARMI_ADD^k^inv, d, r);
return 1;
int32_t other = ra_iskref(ref) ? ra_krefk(as, ref) : IR(ref)->i;
if (other) {
int32_t delta = i - other;
uint32_t sh, inv = 0, k2, k;
if (delta < 0) { delta = -delta; inv = ARMI_ADD^ARMI_SUB; }
sh = lj_ffs(delta) & ~1;
k2 = emit_isk12(0, delta & (255 << sh));
k = emit_isk12(0, delta & ~(255 << sh));
if (k) {
emit_dn(as, ARMI_ADD^k2^inv, d, d);
emit_dn(as, ARMI_ADD^k^inv, d, r);
return 1;
}
}
}
rset_clear(work, r);