diff options
Diffstat (limited to 'gcc/cse.c')
| -rw-r--r-- | gcc/cse.c | 49 |
1 files changed, 0 insertions, 49 deletions
@@ -5598,41 +5598,6 @@ cse_insn (rtx insn, rtx libcall_insn) 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, - record this fact with a REG_WAS_0 note on this insn. - - Note that the *register* is required to have previously held 0, - not just any register in the quantity and we must point to the - insn that set that register to zero. - - Rather than track each register individually, we just see if - the last set for this quantity was for this register. */ - - if (REGNO_QTY_VALID_P (REGNO (dest))) - { - int dest_q = REG_QTY (REGNO (dest)); - struct qty_table_elem *dest_ent = &qty_table[dest_q]; - - if (dest_ent->const_rtx == const0_rtx) - { - /* See if we previously had a REG_WAS_0 note. */ - rtx note = find_reg_note (insn, REG_WAS_0, NULL_RTX); - rtx const_insn = dest_ent->const_insn; - - if ((tem = single_set (const_insn)) != 0 - && rtx_equal_p (SET_DEST (tem), dest)) - { - if (note) - XEXP (note, 0) = const_insn; - else - REG_NOTES (insn) - = gen_rtx_INSN_LIST (REG_WAS_0, const_insn, - REG_NOTES (insn)); - } - } - } } /* Now deal with the destination. */ @@ -6238,20 +6203,6 @@ cse_insn (rtx insn, rtx libcall_insn) validate_change (insn, &SET_SRC (sets[0].rtl), dest, 1); apply_change_group (); - /* If there was a REG_WAS_0 note on PREV, remove it. Move - any REG_WAS_0 note on INSN to PREV. */ - note = find_reg_note (prev, REG_WAS_0, NULL_RTX); - if (note) - remove_note (prev, note); - - note = find_reg_note (insn, REG_WAS_0, NULL_RTX); - if (note) - { - remove_note (insn, note); - 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. If the note's value is REG1, we must |