------- Comment #13 from jh at suse dot cz 2005-10-18 18:29 ------- Subject: Re: ix86 prologue clobbers memory when it shouldn't
> > > ------- Comment #12 from hjl at lucon dot org 2005-10-18 18:26 ------- > There is another issue when converting stack additions to pop: > > (define_peephole2 > [(match_scratch:SI 0 "r") > (parallel [(set (reg:SI SP_REG) (plus:SI (reg:SI SP_REG) (const_int 4))) > > (clobber (reg:CC FLAGS_REG))])] > "" > [(parallel [(set (match_dup 0) (mem:SI (reg:SI SP_REG))) > (set (reg:SI SP_REG) (plus:SI (reg:SI SP_REG) (const_int 4)))])] > "") > > Is that 100% safe with red zone? In theory, compiler can adjust stack, but not > clobber memory since there is a red zone. It is reading memory here, not writting so it should be safe... Honza > > > -- > > > http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24419 > > ------- You are receiving this mail because: ------- > You are on the CC list for the bug, or are watching someone who is. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24419
