https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91384
Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
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CC| |law at redhat dot com
--- Comment #6 from Jeffrey A. Law <law at redhat dot com> ---
Couldn't cmpelim realize insn6 sets the condition codes in a useful way in this
RTL:
(insn 29 3 6 2 (set (reg/v:SI 40 r12 [orig:82 <retval> ] [82])
(reg/v:SI 5 di [orig:83 a ] [83])) "j.c":9:9 67 {*movsi_internal}
(nil))
(insn 6 29 7 2 (parallel [
(set (reg/v:SI 40 r12 [orig:82 <retval> ] [82])
(neg:SI (reg/v:SI 40 r12 [orig:82 <retval> ] [82])))
(clobber (reg:CC 17 flags))
]) "j.c":9:9 525 {*negsi2_1}
(nil))
(insn 7 6 8 2 (set (reg:CCZ 17 flags)
(compare:CCZ (reg/v:SI 5 di [orig:83 a ] [83])
(const_int 0 [0]))) "j.c":9:6 7 {*cmpsi_ccno_1}
(nil))
(jump_insn 8 7 9 2 (set (pc)
(if_then_else (eq (reg:CCZ 17 flags)
(const_int 0 [0]))
(label_ref 13)
(pc))) "j.c":9:6 736 {*jcc}
If we're just interested in CC_Z, then we could use the output of insn 7 rather
than needing a distinct test insn.
