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Add IR_XBAR, a barrier against XLOAD/XSTORE optimizations.

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Mike Pall
2011-02-07 21:59:25 +01:00
parent 0a50356b6f
commit 97d0874ff5
4 changed files with 6 additions and 2 deletions
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2
src/lj_opt_mem.c
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@@ -676,6 +676,7 @@ TRef LJ_FASTCALL lj_opt_fwd_xload(jit_State *J)
ref = J->chain[IR_XSTORE];
retry:
if (J->chain[IR_CALLXS] > lim) lim = J->chain[IR_CALLXS];
if (J->chain[IR_XBAR] > lim) lim = J->chain[IR_XBAR];
while (ref > lim) {
IRIns *store = IR(ref);
switch (aa_xref(J, xr, fins, store)) {
@@ -738,6 +739,7 @@ TRef LJ_FASTCALL lj_opt_dse_xstore(jit_State *J)
IRRef1 *refp = &J->chain[IR_XSTORE];
IRRef ref = *refp;
if (J->chain[IR_CALLXS] > lim) lim = J->chain[IR_CALLXS];
if (J->chain[IR_XBAR] > lim) lim = J->chain[IR_XBAR];
while (ref > lim) { /* Search for redundant or conflicting stores. */
IRIns *store = IR(ref);
switch (aa_xref(J, xr, fins, store)) {