0x00000000007063d0 <check_qualified_type+0>:    sub    $0x8,%rsp
0x00000000007063d4 <check_qualified_type+4>:    movzbl 0x19(%rdi),%ecx
0x00000000007063d8 <check_qualified_type+8>:    movzbl 0x46(%rdi),%eax
0x00000000007063dc <check_qualified_type+12>:   mov    %rsi,%r8
0x00000000007063df <check_qualified_type+15>:   mov    $0x1,%esi
0x00000000007063e4 <check_qualified_type+20>:   shr    $0x3,%cl
0x00000000007063e7 <check_qualified_type+23>:   shr    $0x5,%al
0x00000000007063ea <check_qualified_type+26>:   and    %ecx,%esi
0x00000000007063ec <check_qualified_type+28>:   and    $0x1,%eax
0x00000000007063ef <check_qualified_type+31>:   shr    %cl
0x00000000007063f1 <check_qualified_type+33>:   add    %esi,%esi
0x00000000007063f3 <check_qualified_type+35>:   shl    $0x2,%eax
0x00000000007063f6 <check_qualified_type+38>:   and    $0x1,%ecx
0x00000000007063f9 <check_qualified_type+41>:   or     %eax,%esi
0x00000000007063fb <check_qualified_type+43>:   or     %ecx,%esi
0x00000000007063fd <check_qualified_type+45>:   cmp    %edx,%esi
0x00000000007063ff <check_qualified_type+47>:   je     0x706408 <check_qualified_type+56>

0x0000000000706401 <check_qualified_type+49>:   xor    %eax,%eax
0x0000000000706403 <check_qualified_type+51>:   add    $0x8,%rsp
0x0000000000706407 <check_qualified_type+55>:   retq   

0x00000000007064bf <get_qualified_type+127>:    test   %al,%al
0x00000000007064c1 <get_qualified_type+129>:    je     0x7064a5 <get_qualified_type+101>

0x00000000007064a5 <get_qualified_type+101>:    mov    0x80(%rbx),%rbx
0x00000000007064ac <get_qualified_type+108>:    test   %rbx,%rbx
0x00000000007064af <get_qualified_type+111>:    je     0x7064c8 <get_qualified_type+136>

0x00000000007064b1 <get_qualified_type+113>:    mov    %r12d,%edx
0x00000000007064b4 <get_qualified_type+116>:    mov    %rbp,%rsi
0x00000000007064b7 <get_qualified_type+119>:    mov    %rbx,%rdi
0x00000000007064ba <get_qualified_type+122>:    callq  0x7063d0 <check_qualified_type>

(gdb) bt
#0  0x00000000007063d0 in check_qualified_type ()
#1  0x00000000007064bf in get_qualified_type ()
#2  0x00000000007064ee in build_qualified_type ()
#3  0x0000000000484866 in create_tag_raw ()
#4  0x0000000000486316 in create_memory_tag ()
#5  0x0000000000489a1f in setup_pointers_and_addressables ()
#6  0x0000000000489d01 in compute_may_aliases ()
#7  0x000000000071d298 in execute_one_pass ()
#8  0x000000000071d3ec in execute_pass_list ()
#9  0x000000000071d3fe in execute_pass_list ()
#10 0x0000000000465e3e in tree_rest_of_compilation ()
#11 0x000000000040b40c in c_expand_body ()
#12 0x0000000000765d44 in cgraph_expand_function ()
#13 0x000000000076666e in cgraph_optimize ()
#14 0x000000000040edb6 in c_write_global_declarations ()
#15 0x00000000006ffa1f in toplev_main ()
#16 0x00007ffff7aad1a6 in __libc_start_main () from /lib/libc.so.6
#17 0x0000000000402909 in _start ()
(gdb) info all-registers
rax            0x0      0
rbx            0x7ffff751f2c0   140737342730944
rcx            0x1      1
rdx            0x0      0
rsi            0x7ffff751f210   140737342730768
rdi            0x7ffff751f2c0   140737342730944
rbp            0x7ffff751f210   0x7ffff751f210
rsp            0x7fffffff9f48   0x7fffffff9f48
r8             0x7ffff751f210   140737342730768
r9             0x5      5
r10            0x0      0
r11            0x1      1
r12            0x0      0
r13            0x25     37
r14            0xcfae00 13610496
r15            0x3e     62
rip            0x7063d0 0x7063d0 <check_qualified_type>
eflags         0x206    [ PF IF ]
cs             0x33     51
ss             0x2b     43
ds             0x0      0
es             0x0      0
fs             0x0      0
gs             0x0      0
st0            0        (raw 0x00000000000000000000)
st1            0        (raw 0x00000000000000000000)
st2            0        (raw 0x00000000000000000000)
st3            0        (raw 0x00000000000000000000)
st4            0        (raw 0x00000000000000000000)
st5            0        (raw 0x00000000000000000000)
st6            0        (raw 0x00000000000000000000)
st7            0        (raw 0x00000000000000000000)
fctrl          0x37f    895
fstat          0x0      0
ftag           0xffff   65535
fiseg          0x0      0
fioff          0x0      0
foseg          0x0      0
fooff          0x0      0
fop            0x0      0
xmm0           {v4_float = {0x8000000, 0x3, 0x0, 0x0}, v2_double = {0x9b, 0x0}, v16_int8 = {0x0, 0x0, 0x0, 0x4d, 0x64, 0x73, 0x63, 0x40, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0x0, 0x4d00, 0x7364, 0x4063, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x4d000000,
    0x40637364, 0x0, 0x0}, v2_int64 = {0x406373644d000000, 0x0}, uint128 = 0x0000000000000000406373644d000000}
xmm1           {v4_float = {0x10000000, 0x1, 0x0, 0x0}, v2_double = {0x1, 0x0}, v16_int8 = {0x0, 0x0, 0x80, 0x4d, 0x0, 0x0, 0xf0, 0x3f, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0x0, 0x4d80, 0x0, 0x3ff0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x4d800000,
    0x3ff00000, 0x0, 0x0}, v2_int64 = {0x3ff000004d800000, 0x0}, uint128 = 0x00000000000000003ff000004d800000}
xmm2           {v4_float = {0x74bed8, 0x2, 0x0, 0x0}, v2_double = {0xa, 0x0}, v16_int8 = {0xb0, 0x7d, 0xe9, 0x4a, 0x0, 0x0, 0x24, 0x40, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0x7db0, 0x4ae9, 0x0, 0x4024, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x4ae97db0,
    0x40240000, 0x0, 0x0}, v2_int64 = {0x402400004ae97db0, 0x0}, uint128 = 0x0000000000000000402400004ae97db0}
xmm3           {v4_float = {0x0, 0x1, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xe0, 0x3f, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0x0, 0x0, 0x0, 0x3fe0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x3fe00000, 0x0, 0x0},
  v2_int64 = {0x3fe0000000000000, 0x0}, uint128 = 0x00000000000000003fe0000000000000}
xmm4           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm5           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm6           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm7           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm8           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm9           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm10          {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm11          {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm12          {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm13          {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm14          {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm15          {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
mxcsr          0x1fa0   [ PE IM DM ZM OM UM PM ]

Another iteration:

(gdb) info all-registers 
rax            0x0      0
rbx            0x7ffff751f210   140737342730768
rcx            0x0      0
rdx            0x0      0
rsi            0x7ffff751f210   140737342730768
rdi            0x7ffff751f210   140737342730768
rbp            0x7ffff751f210   0x7ffff751f210
rsp            0x7fffffff9f48   0x7fffffff9f48
r8             0x7ffff751f210   140737342730768
r9             0x5      5
r10            0x0      0
r11            0x1      1
r12            0x0      0
r13            0x25     37
r14            0xcfae00 13610496
r15            0x3e     62
rip            0x7063d0 0x7063d0 <check_qualified_type>
eflags         0x202    [ IF ]
cs             0x33     51
ss             0x2b     43
ds             0x0      0
es             0x0      0
fs             0x0      0
gs             0x0      0
st0            0        (raw 0x00000000000000000000)
st1            0        (raw 0x00000000000000000000)
st2            0        (raw 0x00000000000000000000)
st3            0        (raw 0x00000000000000000000)
st4            0        (raw 0x00000000000000000000)
st5            0        (raw 0x00000000000000000000)
st6            0        (raw 0x00000000000000000000)
st7            0        (raw 0x00000000000000000000)
fctrl          0x37f    895
fstat          0x0      0
ftag           0xffff   65535
fiseg          0x0      0
fioff          0x0      0
foseg          0x0      0
fooff          0x0      0
fop            0x0      0
xmm0           {v4_float = {0x8000000, 0x3, 0x0, 0x0}, v2_double = {0x9b, 0x0}, v16_int8 = {0x0, 0x0, 0x0, 0x4d, 0x64, 0x73, 0x63, 0x40, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0x0, 0x4d00, 0x7364, 0x4063, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x4d000000, 
    0x40637364, 0x0, 0x0}, v2_int64 = {0x406373644d000000, 0x0}, uint128 = 0x0000000000000000406373644d000000}
xmm1           {v4_float = {0x10000000, 0x1, 0x0, 0x0}, v2_double = {0x1, 0x0}, v16_int8 = {0x0, 0x0, 0x80, 0x4d, 0x0, 0x0, 0xf0, 0x3f, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0x0, 0x4d80, 0x0, 0x3ff0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x4d800000, 
    0x3ff00000, 0x0, 0x0}, v2_int64 = {0x3ff000004d800000, 0x0}, uint128 = 0x00000000000000003ff000004d800000}
xmm2           {v4_float = {0x74bed8, 0x2, 0x0, 0x0}, v2_double = {0xa, 0x0}, v16_int8 = {0xb0, 0x7d, 0xe9, 0x4a, 0x0, 0x0, 0x24, 0x40, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0x7db0, 0x4ae9, 0x0, 0x4024, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x4ae97db0, 
    0x40240000, 0x0, 0x0}, v2_int64 = {0x402400004ae97db0, 0x0}, uint128 = 0x0000000000000000402400004ae97db0}
xmm3           {v4_float = {0x0, 0x1, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xe0, 0x3f, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v8_int16 = {0x0, 0x0, 0x0, 0x3fe0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x3fe00000, 0x0, 0x0}, 
  v2_int64 = {0x3fe0000000000000, 0x0}, uint128 = 0x00000000000000003fe0000000000000}
xmm4           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm5           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm6           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm7           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm8           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm9           {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm10          {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm11          {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm12          {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm13          {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm14          {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
xmm15          {v4_float = {0x0, 0x0, 0x0, 0x0}, v2_double = {0x0, 0x0}, v16_int8 = {0x0 <repeats 16 times>}, v8_int16 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, v4_int32 = {0x0, 0x0, 0x0, 0x0}, v2_int64 = {0x0, 0x0}, uint128 = 0x00000000000000000000000000000000}
mxcsr          0x1fa0   [ PE IM DM ZM OM UM PM ]