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Re: [Bug rtl-optimization/17482] [4.0 Regression] GCSE after reload replacing changing instructions
- From: Graham Stott <graham dot stott at btinternet dot com>
- To: gcc-bugzilla at gcc dot gnu dot org, gcc-bugs at gcc dot gnu dot org
- Date: Wed, 15 Sep 2004 20:00:31 +0100 (BST)
- Subject: Re: [Bug rtl-optimization/17482] [4.0 Regression] GCSE after reload replacing changing instructions
Steven,
One thing that stands out from looking at the code is the routines
record_last_set_info and mark_set don't appear to be taking any note
of any REG_INC notes that may be present within the MEM's
Should the existing code:
if (REG_P (dest))
record_last_reg_set_info (insn, REGNO (dest));
else if (MEM_P (dest))
record_last_mem_set_info (insn);
contain this following check for registers mentioned in REG_INC notes?
note = find_reg_note (insn, REG_INC, NULL_RTX);
if (note)
record_last_reg_set_info (insn, REGNO (XEXP (note, 0)));
Graham