cselib.c (expand_loc): Return sp, fp, hfp or cfa base reg right away if seen.
* cselib.c (expand_loc): Return sp, fp, hfp or cfa base reg right away if seen. From-SVN: r184169
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@ -1,5 +1,8 @@
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2012-02-13 Jakub Jelinek <jakub@redhat.com>
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* cselib.c (expand_loc): Return sp, fp, hfp or cfa base reg right
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away if seen.
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* cselib.c (dump_cselib_val): Don't assume l->setting_insn is
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non-NULL.
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12
gcc/cselib.c
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gcc/cselib.c
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@ -1372,8 +1372,18 @@ expand_loc (struct elt_loc_list *p, struct expand_value_data *evd,
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unsigned int regno = UINT_MAX;
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struct elt_loc_list *p_in = p;
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for (; p; p = p -> next)
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for (; p; p = p->next)
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{
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/* Return these right away to avoid returning stack pointer based
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expressions for frame pointer and vice versa, which is something
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that would confuse DSE. See the comment in cselib_expand_value_rtx_1
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for more details. */
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if (REG_P (p->loc)
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&& (REGNO (p->loc) == STACK_POINTER_REGNUM
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|| REGNO (p->loc) == FRAME_POINTER_REGNUM
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|| REGNO (p->loc) == HARD_FRAME_POINTER_REGNUM
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|| REGNO (p->loc) == cfa_base_preserved_regno))
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return p->loc;
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/* Avoid infinite recursion trying to expand a reg into a
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the same reg. */
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if ((REG_P (p->loc))
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