gh-mirror/mikepaul-LuaJIT
1
0
Fork 0
mirror of https://github.com/LuaJIT/LuaJIT.git synced 2025-02-07 23:24:09 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

ARM: Simplify two-step constant rematerialization.

Browse Source
This commit is contained in:
Mike Pall 2012-07-02 22:57:51 +02:00
parent afeb4e2c51
commit 79e1eaa73b
1 changed files with 13 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
src/lj_emit_arm.h
View File

@ -141,16 +141,19 @@ static int emit_kdelta2(ASMState *as, Reg d, int32_t i)
IRRef ref = regcost_ref(as->cost[r]); IRRef ref = regcost_ref(as->cost[r]);
lua_assert(r != d); lua_assert(r != d);
if (emit_canremat(ref)) { if (emit_canremat(ref)) {
int32_t delta = i - (ra_iskref(ref) ? ra_krefk(as, ref) : IR(ref)->i); int32_t other = ra_iskref(ref) ? ra_krefk(as, ref) : IR(ref)->i;
uint32_t sh, inv = 0, k2, k; if (other) {
if (delta < 0) { delta = -delta; inv = ARMI_ADD^ARMI_SUB; } int32_t delta = i - other;
sh = lj_ffs(delta) & ~1; uint32_t sh, inv = 0, k2, k;
k2 = emit_isk12(0, delta & (255 << sh)); if (delta < 0) { delta = -delta; inv = ARMI_ADD^ARMI_SUB; }
k = emit_isk12(0, delta & ~(255 << sh)); sh = lj_ffs(delta) & ~1;
if (k) { k2 = emit_isk12(0, delta & (255 << sh));
emit_dn(as, ARMI_ADD^k2^inv, d, d); k = emit_isk12(0, delta & ~(255 << sh));
emit_dn(as, ARMI_ADD^k^inv, d, r); if (k) {
return 1; emit_dn(as, ARMI_ADD^k2^inv, d, d);
emit_dn(as, ARMI_ADD^k^inv, d, r);
return 1;
}
} }
} }
rset_clear(work, r); rset_clear(work, r);