diff options
| -rw-r--r-- | gcc/cse.c | 21 |
1 files changed, 0 insertions, 21 deletions
diff --git a/gcc/cse.c b/gcc/cse.c index 1478556aa38..f6ebb068297 100644 --- a/gcc/cse.c +++ b/gcc/cse.c @@ -5517,32 +5517,11 @@ 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)) { - rtx simplified_src_const; tem = find_reg_note (insn, REG_EQUAL, NULL_RTX); /* Make sure that the rtx is not shared with any other insn. */ src_const = copy_rtx (src_const); - /* Try to simplify SRC_CONST. - - The primary purpose behind simplifying the note is to allow - for easier removal of library call sequences later. Consider - a udiv libcall where we can determine the second argument is - a constant. SRC_CONST would look like: - - (udiv (reg) (const_int 2**n)) - - That RTL expression will simplify into: - - (lshiftrt (reg) (const_int n)) - - A target using library calls for division is more likely to - have a lshiftrt insn. Thus, it is more likely that the libcall - can be deleted in delete_trivially_dead_insns if we simplify - the note. */ - simplified_src_const = simplify_rtx (src_const); - src_const = simplified_src_const ? simplified_src_const : src_const; - /* Record the actual constant value in a REG_EQUAL note, making a new one if one does not already exist. */ if (tem) |