On 7/16/25 9:20 AM, Stefan Schulze Frielinghaus wrote:
During jump bypassing also consider insns of the form
(insn 25 57 26 9 (parallel [
(set (reg:CCZ 33 %cc)
(compare:CCZ (reg:SI 60 [ _9 ])
(const_int 0 [0])))
(clobber (scratch:SI))
]) "spaceship-fp-4.c":27:1 1746 {*tstsi_cconly_extimm}
(nil))
by testing for a single set insn during bypass_conditional_jumps().
This is a requirement for test gcc.target/s390/spaceship-fp-4.c of the
subsequent commit.
In order to silence
cprop.cc:1621:40: error: 'setcc_dest' may be used uninitialized
[-Werror=maybe-uninitialized]
1621 | src = simplify_replace_rtx (src, setcc_dest, setcc_src);
| ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
initialize setcc_{dest,src} in bypass_block() although this is not
really required.
gcc/ChangeLog:
* cprop.cc (bypass_block): Extract single set.
(bypass_conditional_jumps): Ditto.
OK.
jeff
