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Add stricter check for sinking PHIs.

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This commit is contained in:
Mike Pall
2012-07-04 11:41:58 +02:00
parent 4da7ffc34b
commit c22d698e17
1 changed files with 3 additions and 2 deletions
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5
src/lj_opt_sink.c
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@@ -47,7 +47,7 @@ static int sink_phidep(jit_State *J, IRRef ref)
return 0; return 0;
} }
/* Check whether a value is a sinkable PHI or a non-PHI. */ /* Check whether a value is a sinkable PHI or loop-invariant. */
static int sink_checkphi(jit_State *J, IRIns *ira, IRRef ref) static int sink_checkphi(jit_State *J, IRIns *ira, IRRef ref)
{ {
if (ref >= REF_FIRST) { if (ref >= REF_FIRST) {
@@ -57,7 +57,8 @@ static int sink_checkphi(jit_State *J, IRIns *ira, IRRef ref)
ira->prev++; ira->prev++;
return 1; /* Sinkable PHI. */ return 1; /* Sinkable PHI. */
} }
return !sink_phidep(J, ref); /* Must be a non-PHI then. */ /* Otherwise the value must be loop-invariant. */
return ref < J->loopref && !sink_phidep(J, ref);
} }
return 1; /* Constant (non-PHI). */ return 1; /* Constant (non-PHI). */
} }