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(cse_insn): When do special handling for (set REG0 REG1), must delete
author
Richard Kenner
<kenner@gcc.gnu.org>
Wed, 26 Jul 1995 13:31:00 +0000
(09:31 -0400)
committer
Richard Kenner
<kenner@gcc.gnu.org>
Wed, 26 Jul 1995 13:31:00 +0000
(09:31 -0400)
REG_EQUAL note from insn if it mentions REG0.
From-SVN: r10169
gcc/cse.c
patch
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diff --git
a/gcc/cse.c
b/gcc/cse.c
index 1b302f5e92f6b783f7a796e9b3600d343355f2f7..3c5ba6fae000bf25a7b41f5b206162c0d722e158 100644
(file)
--- a/
gcc/cse.c
+++ b/
gcc/cse.c
@@
-7417,6
+7417,12
@@
cse_insn (insn, in_libcall_block)
XEXP (note, 1) = REG_NOTES (prev);
REG_NOTES (prev) = note;
}
+
+ /* If INSN has a REG_EQUAL note, and this note mentions REG0,
+ then we must delete it, because the value in REG0 has changed. */
+ note = find_reg_note (insn, REG_EQUAL, NULL_RTX);
+ if (note && reg_mentioned_p (dest, XEXP (note, 0)))
+ remove_note (insn, note);
}
}