diff options
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, |