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| author | Roger Sayle <roger@eyesopen.com> | 2003-01-28 14:52:07 +0000 |
|---|---|---|
| committer | Roger Sayle <sayle@gcc.gnu.org> | 2003-01-28 14:52:07 +0000 |
| commit | a77b7e32ec72dc7ee6085cfe0cf29b4384c70b1e (patch) | |
| tree | 64aacc56afbb7ec47bda44a8380a7ded1e0eff0a /gcc/cse.c | |
| parent | 4ff71d245b0c77d25fc7a18aaab439c1a1ae8afa (diff) | |
| download | gcc-a77b7e32ec72dc7ee6085cfe0cf29b4384c70b1e.zip gcc-a77b7e32ec72dc7ee6085cfe0cf29b4384c70b1e.tar.gz gcc-a77b7e32ec72dc7ee6085cfe0cf29b4384c70b1e.tar.bz2 | |
* cse.c (cse_insn): Avoid redundant REG_EQUAL notes.
From-SVN: r61971
Diffstat (limited to 'gcc/cse.c')
| -rw-r--r-- | gcc/cse.c | 14 |
1 files changed, 9 insertions, 5 deletions
@@ -5684,12 +5684,16 @@ cse_insn (insn, libcall_insn) && GET_CODE (XEXP (XEXP (src_const, 0), 0)) == LABEL_REF && GET_CODE (XEXP (XEXP (src_const, 0), 1)) == LABEL_REF)) { - /* Make sure that the rtx is not shared with any other insn. */ - src_const = copy_rtx (src_const); + /* We only want a REG_EQUAL note if src_const != src. */ + if (! rtx_equal_p (src, src_const)) + { + /* Make sure that the rtx is not shared. */ + src_const = copy_rtx (src_const); - /* Record the actual constant value in a REG_EQUAL note, making - a new one if one does not already exist. */ - set_unique_reg_note (insn, REG_EQUAL, src_const); + /* Record the actual constant value in a REG_EQUAL note, + making a new one if one does not already exist. */ + set_unique_reg_note (insn, REG_EQUAL, src_const); + } /* If storing a constant value in a register that previously held the constant value 0, |