When changing reg_known_value to a VEC, Steven sneaked in a small
semantic change. That change has the advantage of improving compilation
time substantially on some testcases (including PR55489), but it is a
bit heavy-handed: it also makes set_known_reg_value a no-op, while
get_known_reg_value will always return NULL.
This patch fixes the VEC usage. Bootstrap/regtest in progress, but I'm
going to commit this as obvious as soon as bootstrapping finishes.
Paolo
2012-11-26 Paolo Bonzini <pbonz...@redhat.com>
* alias.c (init_alias_analysis): Fix allocation of reg_known_value.
Index: ../../gcc/alias.c
===================================================================
--- ../../gcc/alias.c (revisione 193853)
+++ ../../gcc/alias.c (copia locale)
@@ -2808,7 +2808,7 @@ init_alias_analysis (void)
timevar_push (TV_ALIAS_ANALYSIS);
- vec_alloc (reg_known_value, maxreg - FIRST_PSEUDO_REGISTER);
+ vec_safe_grow_cleared (reg_known_value, maxreg - FIRST_PSEUDO_REGISTER);
reg_known_equiv_p = sbitmap_alloc (maxreg - FIRST_PSEUDO_REGISTER);
/* If we have memory allocated from the previous run, use it. */
