From: Mike Pall <mike>
Date: Wed, 11 Apr 2012 14:22:05 +0000 (+0200)
Subject: Fix DSE of USTORE. Have to remove OBAR, too.
X-Git-Tag: v2.0.0-beta10~26
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3ed5172fe49ab9cd08e803c3bec1fc29492e24fe;p=thirdparty%2FLuaJIT.git

Fix DSE of USTORE. Have to remove OBAR, too.
---

diff --git a/src/lj_opt_mem.c b/src/lj_opt_mem.c
index d64d2e6e..17e29569 100644
--- a/src/lj_opt_mem.c
+++ b/src/lj_opt_mem.c
@@ -422,6 +422,19 @@ TRef LJ_FASTCALL lj_opt_dse_ustore(jit_State *J)
 	store->t.irt = IRT_NIL;
 	store->op1 = store->op2 = 0;
 	store->prev = 0;
+	if (ref+1 < J->cur.nins &&
+	    store[1].o == IR_OBAR && store[1].op1 == xref) {
+	  IRRef1 *bp = &J->chain[IR_OBAR];
+	  IRIns *obar;
+	  for (obar = IR(*bp); *bp > ref+1; obar = IR(*bp))
+	    bp = &obar->prev;
+	  /* Remove OBAR, too. */
+	  *bp = obar->prev;
+	  obar->o = IR_NOP;
+	  obar->t.irt = IRT_NIL;
+	  obar->op1 = obar->op2 = 0;
+	  obar->prev = 0;
+	}
 	/* Now emit the new store instead. */
       }
       goto doemit;