https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108681
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
The peephole2 dump keeps repeating
Finished finding needed instructions:
processing block 3 lr out = 31 [sp] 34 [v2] 35 [v3] 36 [v4] 37 [v5] 40 [v8]
Adding insn 12 to worklist
Adding insn 36 to worklist
Adding insn 35 to worklist
Adding insn 34 to worklist
Adding insn 33 to worklist
Adding insn 8 to worklist
processing block 2 lr out = 31 [sp] 34 [v2] 35 [v3] 36 [v4] 40 [v8]
Adding insn 2 to worklist
Adding insn 38 to worklist
df_worklist_dataflow_doublequeue: n_basic_blocks 4 n_edges 3 count 4 ( 1)
forever.
bb 3 is:
(code_label 13 4 7 3 2 (nil) [1 uses])
(note 7 13 9 3 [bb 3] NOTE_INSN_BASIC_BLOCK)
(insn 9 7 8 3 (clobber (subreg:V1DI (reg/v:V4x1DI 34 v2 [orig:92 b ] [92]) 24))
"pr108681.C":10:14 -1
(expr_list:REG_UNUSED (reg/v:V4x1DI 34 v2 [orig:92 b ] [92])
(nil)))
(insn:TI 8 9 33 3 (set (reg:DI 37 v5 [ b+24 ])
(reg:DI 40 v8 [orig:93 a ] [93])) "pr108681.C":10:14 65
{*movdi_aarch64}
(nil))
(insn 33 8 34 3 (set (reg:DI 32 v0)
(reg:DI 34 v2)) "pr108681.C":11:9 65 {*movdi_aarch64}
(expr_list:REG_DEAD (reg:DI 34 v2)
(nil)))
(insn:TI 34 33 35 3 (set (reg:DI 33 v1)
(reg:DI 35 v3)) "pr108681.C":11:9 65 {*movdi_aarch64}
(expr_list:REG_DEAD (reg:DI 35 v3)
(nil)))
(insn 35 34 36 3 (set (reg:DI 34 v2)
(reg:DI 36 v4)) "pr108681.C":11:9 65 {*movdi_aarch64}
(expr_list:REG_DEAD (reg:DI 36 v4)
(nil)))
(insn:TI 36 35 11 3 (set (reg:DI 35 v3)
(reg:DI 37 v5)) "pr108681.C":11:9 65 {*movdi_aarch64}
(expr_list:REG_DEAD (reg:DI 37 v5)
(nil)))
(call_insn 11 36 12 3 (parallel [
(call (mem:DI (symbol_ref:DI ("_Z3foo11int64x1x4_t") [flags 0x41]
<function_decl 0x7fffe9ef9c00 foo>) [0 foo S8 A8])
(const_int 0 [0]))
(unspec:DI [
(const_int 0 [0])
] UNSPEC_CALLEE_ABI)
(clobber (reg:DI 30 x30))
]) "pr108681.C":11:9 58 {*call_insn}
(expr_list:REG_DEAD (reg:V4x1DI 32 v0)
(expr_list:REG_CALL_DECL (symbol_ref:DI ("_Z3foo11int64x1x4_t") [flags
0x41] <function_decl 0x7fffe9ef9c00 foo>)
(nil)))
(expr_list (clobber (reg:DI 17 x17))
(expr_list (clobber (reg:DI 16 x16))
(expr_list:V4x1DI (use (reg:V4x1DI 32 v0))
(nil)))))
(insn 12 11 30 3 (clobber (reg/v:V4x1DI 34 v2 [orig:92 b ] [92])) -1
(expr_list:REG_UNUSED (reg:TI 36 v4)
(nil)))
(jump_insn:TI 30 12 31 3 (set (pc)
(label_ref 13)) 2 {jump}
(nil)
-> 13)
and bb 2
(note 5 1 37 2 [bb 2] NOTE_INSN_BASIC_BLOCK)
(insn/f:TI 37 5 38 2 (parallel [
(set (reg/f:DI 31 sp)
(plus:DI (reg/f:DI 31 sp)
(const_int -32 [0xffffffffffffffe0])))
(set/f (mem:DI (plus:DI (reg/f:DI 31 sp)
(const_int -32 [0xffffffffffffffe0])) [0 S8 A8])
(reg:DI 29 x29))
(set/f (mem:DI (plus:DI (reg/f:DI 31 sp)
(const_int -24 [0xffffffffffffffe8])) [0 S8 A8])
(reg:DI 30 x30))
]) "pr108681.C":7:1 127 {storewb_pairdi_di}
(expr_list:REG_DEAD (reg:DI 30 x30)
(expr_list:REG_DEAD (reg:DI 29 x29)
(nil))))
(insn 38 37 39 2 (set (reg/f:DI 29 x29)
(reg/f:DI 31 sp)) "pr108681.C":7:1 65 {*movdi_aarch64}
(nil))
(insn:TI 39 38 40 2 (set (mem:BLK (scratch) [0 A8])
(unspec:BLK [
(reg/f:DI 31 sp)
(reg/f:DI 29 x29)
] UNSPEC_PRLG_STK)) "pr108681.C":7:1 1140 {stack_tie}
(expr_list:REG_DEAD (reg/f:DI 29 x29)
(nil)))
(insn/f 40 39 41 2 (set (mem/c:DF (plus:DI (reg/f:DI 31 sp)
(const_int 16 [0x10])) [3 S8 A8])
(reg:DF 40 v8)) "pr108681.C":7:1 76 {*movdf_aarch64}
(expr_list:REG_DEAD (reg:DF 40 v8)
(nil)))
(note 41 40 2 2 NOTE_INSN_PROLOGUE_END)
(insn:TI 2 41 4 2 (set (reg:DI 40 v8 [orig:93 a ] [93])
(reg:DI 32 v0 [ a ])) "pr108681.C":7:1 65 {*movdi_aarch64}
(expr_list:REG_DEAD (reg:DI 32 v0 [ a ])
(nil)))
(note 4 2 13 2 NOTE_INSN_FUNCTION_BEG)
