gistfile1.txt

Before:

ffffffff81574b60 <__sanitizer_cov_trace_pc>:
ffffffff81574b60:       65 48 8b 04 25 c0 4e    mov    %gs:0x14ec0,%rax
ffffffff81574b67:       01 00 
ffffffff81574b69:       48 85 c0                test   %rax,%rax
ffffffff81574b6c:       74 1a                   je     ffffffff81574b88 <__sanitizer_cov_trace_pc+0x28>
ffffffff81574b6e:       65 8b 15 db 02 aa 7e    mov    %gs:0x7eaa02db(%rip),%edx        # 14e50 <__preempt_count>
ffffffff81574b75:       81 e2 00 ff 1f 00       and    $0x1fff00,%edx
ffffffff81574b7b:       75 0b                   jne    ffffffff81574b88 <__sanitizer_cov_trace_pc+0x28>
ffffffff81574b7d:       8b 90 60 12 00 00       mov    0x1260(%rax),%edx
ffffffff81574b83:       83 fa 01                cmp    $0x1,%edx
ffffffff81574b86:       74 02                   je     ffffffff81574b8a <__sanitizer_cov_trace_pc+0x2a>
ffffffff81574b88:       f3 c3                   repz retq 
ffffffff81574b8a:       48 8b 88 68 12 00 00    mov    0x1268(%rax),%rcx
ffffffff81574b91:       8b 11                   mov    (%rcx),%edx
ffffffff81574b93:       83 c2 01                add    $0x1,%edx
ffffffff81574b96:       3b 90 64 12 00 00       cmp    0x1264(%rax),%edx
ffffffff81574b9c:       73 ea                   jae    ffffffff81574b88 <__sanitizer_cov_trace_pc+0x28>
ffffffff81574b9e:       55                      push   %rbp
ffffffff81574b9f:       89 d0                   mov    %edx,%eax
ffffffff81574ba1:       48 89 e5                mov    %rsp,%rbp
ffffffff81574ba4:       48 8b 75 08             mov    0x8(%rbp),%rsi
ffffffff81574ba8:       89 34 81                mov    %esi,(%rcx,%rax,4)
ffffffff81574bab:       89 11                   mov    %edx,(%rcx)
ffffffff81574bad:       5d                      pop    %rbp
ffffffff81574bae:       c3                      retq   
ffffffff81574baf:       90                      nop

After:

ffffffff81574b60 <__sanitizer_cov_trace_pc>:
ffffffff81574b60:       55                      push   %rbp
ffffffff81574b61:       48 89 e5                mov    %rsp,%rbp
ffffffff81574b64:       41 55                   push   %r13
ffffffff81574b66:       41 54                   push   %r12
ffffffff81574b68:       53                      push   %rbx
ffffffff81574b69:       65 48 8b 1c 25 c0 4e    mov    %gs:0x14ec0,%rbx
ffffffff81574b70:       01 00 
ffffffff81574b72:       48 85 db                test   %rbx,%rbx
ffffffff81574b75:       74 19                   je     ffffffff81574b90 <__sanitizer_cov_trace_pc+0x30>
ffffffff81574b77:       65 8b 05 d2 02 aa 7e    mov    %gs:0x7eaa02d2(%rip),%eax        # 14e50 <__preempt_count>
ffffffff81574b7e:       a9 00 ff 1f 00          test   $0x1fff00,%eax
ffffffff81574b83:       75 0b                   jne    ffffffff81574b90 <__sanitizer_cov_trace_pc+0x30>
ffffffff81574b85:       8b 83 60 12 00 00       mov    0x1260(%rbx),%eax
ffffffff81574b8b:       83 f8 01                cmp    $0x1,%eax
ffffffff81574b8e:       74 07                   je     ffffffff81574b97 <__sanitizer_cov_trace_pc+0x37>
ffffffff81574b90:       5b                      pop    %rbx
ffffffff81574b91:       41 5c                   pop    %r12
ffffffff81574b93:       41 5d                   pop    %r13
ffffffff81574b95:       5d                      pop    %rbp
ffffffff81574b96:       c3                      retq   
ffffffff81574b97:       4c 8b ab 68 12 00 00    mov    0x1268(%rbx),%r13
ffffffff81574b9e:       be 4f 00 00 00          mov    $0x4f,%esi
ffffffff81574ba3:       48 c7 c7 b9 58 33 87    mov    $0xffffffff873358b9,%rdi
ffffffff81574baa:       e8 a1 f9 15 00          callq  ffffffff816d4550 <__might_fault>
ffffffff81574baf:       4c 89 e8                mov    %r13,%rax
ffffffff81574bb2:       e8 49 e6 3d 01          callq  ffffffff82953200 <__get_user_4>
ffffffff81574bb7:       44 8d 62 01             lea    0x1(%rdx),%r12d
ffffffff81574bbb:       44 3b a3 64 12 00 00    cmp    0x1264(%rbx),%r12d
ffffffff81574bc2:       73 cc                   jae    ffffffff81574b90 <__sanitizer_cov_trace_pc+0x30>
ffffffff81574bc4:       be 52 00 00 00          mov    $0x52,%esi
ffffffff81574bc9:       48 c7 c7 b9 58 33 87    mov    $0xffffffff873358b9,%rdi
ffffffff81574bd0:       e8 7b f9 15 00          callq  ffffffff816d4550 <__might_fault>
ffffffff81574bd5:       44 89 e0                mov    %r12d,%eax
ffffffff81574bd8:       49 8d 4c 85 00          lea    0x0(%r13,%rax,4),%rcx
ffffffff81574bdd:       8b 45 08                mov    0x8(%rbp),%eax
ffffffff81574be0:       e8 5b 32 3e 01          callq  ffffffff82957e40 <__put_user_4>
ffffffff81574be5:       be 53 00 00 00          mov    $0x53,%esi
ffffffff81574bea:       48 c7 c7 b9 58 33 87    mov    $0xffffffff873358b9,%rdi
ffffffff81574bf1:       e8 5a f9 15 00          callq  ffffffff816d4550 <__might_fault>
ffffffff81574bf6:       44 89 e0                mov    %r12d,%eax
ffffffff81574bf9:       4c 89 e9                mov    %r13,%rcx
ffffffff81574bfc:       e8 3f 32 3e 01          callq  ffffffff82957e40 <__put_user_4>
ffffffff81574c01:       eb 8d                   jmp    ffffffff81574b90 <__sanitizer_cov_trace_pc+0x30>
ffffffff81574c03:       66 66 66 66 2e 0f 1f    data32 data32 data32 nopw %cs:0x0(%rax,%rax,1)
ffffffff81574c0a:       84 00 00 00 00 00