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[committed] Fix rtx-sharing problem in split_insns
- From: Richard Sandiford <rdsandiford at googlemail dot com>
- To: gcc-patches at gcc dot gnu dot org
- Date: Thu, 02 Aug 2012 21:44:56 +0100
- Subject: [committed] Fix rtx-sharing problem in split_insns
I hit a case where we were splitting a set of (const (unspec [...]))
into something that still referred to the original expression.
We reused that same expression as a REG_EQUAL note, leading to
an rtx-sharing violation.
Tested on mips64-linux-gnu and applied.
Richard
gcc/
* recog.c (split_insn): Copy the original SET_SRC before using
it as a note.
Index: gcc/recog.c
===================================================================
--- gcc/recog.c 2012-08-02 21:19:07.321527035 +0100
+++ gcc/recog.c 2012-08-02 21:22:58.721526468 +0100
@@ -2831,7 +2831,8 @@ split_insn (rtx insn)
if (note && CONSTANT_P (XEXP (note, 0)))
set_unique_reg_note (last, REG_EQUAL, XEXP (note, 0));
else if (CONSTANT_P (SET_SRC (insn_set)))
- set_unique_reg_note (last, REG_EQUAL, SET_SRC (insn_set));
+ set_unique_reg_note (last, REG_EQUAL,
+ copy_rtx (SET_SRC (insn_set)));
}
}