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Generate REG_EQUAL notes when they'd be helpful

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From-SVN: r36409
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Bernd Schmidt 2000-09-14 16:45:42 +00:00 committed by Bernd Schmidt
parent cad396c8b0
commit 2f93c5c355
2 changed files with 14 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2000-09-12 Bernd Schmidt <bernds@redhat.co.uk>
From Joern Rennecke:
* local-alloc.c (update_equiv_regs): If there is no REG_EQUAL note
on an insn and function_invariant_p returns nonzero for the source,
add a REG_EQUAL note.
Thu Sep 14 00:51:57 EDT 2000 John Wehle (john@feith.com)
* alias.c (memrefs_conflict_p): An ADDRESSOF doesn't

7
gcc/local-alloc.c
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@ -787,6 +787,13 @@ update_equiv_regs ()
note = find_reg_note (insn, REG_EQUAL, NULL_RTX);
/* cse sometimes generates function invariants, but doesn't put a
REG_EQUAL note on the insn. Since this note would be redundant,
there's no point creating it earlier than here. */
if (! note && function_invariant_p (src))
REG_NOTES (insn)
= note = gen_rtx_EXPR_LIST (REG_EQUAL, src, REG_NOTES (insn));
if (REG_N_SETS (regno) != 1
&& (! note
|| ! function_invariant_p (XEXP (note, 0))