------- 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.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24419
