https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103074
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Ah, actually what I see is that sched1 swaps the order of:
(insn 22 21 23 4 (parallel [
(set (reg:SI 88)
(ashiftrt:SI (reg/v:SI 84 [ a ])
(const_int 32 [0x20])))
(clobber (reg:CC 17 flags))
]) "pr103074.c":10:7 735 {*ashrsi3_1}
(expr_list:REG_UNUSED (reg:CC 17 flags)
(nil)))
(insn 23 22 24 4 (set (reg:SI 2 cx)
(reg/v:SI 84 [ a ])) "pr103074.c":10:7 77 {*movsi_internal}
(expr_list:REG_DEAD (reg/v:SI 84 [ a ])
(nil)))
and doing a shift when cx is live isn't an option because the shift needs the
hard register for this shift amount (the constraints are Ic and I is 0..31
constant, c is %cx register).
