| /* Original C (for context): |
| * // Declare a real external call so the compiler must respect ABI clobbers. |
| * extern int leaf(int) __attribute__((noinline)); |
| * |
| * __attribute__((noinline)) |
| * int live_across_call(int x) { |
| * volatile int a = x; // a starts in a GPR (from arg) |
| * asm volatile("" :: "r"(a)); // keep 'a' live in a register |
| * int r = leaf(a); // 'a' is live across the call |
| * asm volatile("" :: "r"(a), "r"(r));// still live afterwards |
| * return a + r; |
| * } |
| */ |
| .file "live_across_call.c" |
| .text |
| .globl live_across_call # -- Begin function live_across_call |
| .p2align 4 |
| .type live_across_call,@function |
| live_across_call: # @live_across_call |
| .Lfunc_begin0: |
| .file 0 "." "live_across_call.c" md5 0x351c37295026edf0d468774d35f47e5e |
| .loc 0 5 0 # live_across_call.c:5:0 |
| .cfi_startproc |
| # %bb.0: # %entry |
| #DEBUG_VALUE: live_across_call:x <- $edi |
| pushq %rbp |
| .cfi_def_cfa_offset 16 |
| .cfi_offset %rbp, -16 |
| movq %rsp, %rbp |
| .cfi_def_cfa_register %rbp |
| subq $16, %rsp |
| .Ltmp0: |
| .loc 0 6 16 prologue_end # live_across_call.c:6:16 |
| movl %edi, -4(%rbp) |
| .loc 0 7 26 # live_across_call.c:7:26 |
| movl -4(%rbp), %eax |
| .loc 0 7 3 is_stmt 0 # live_across_call.c:7:3 |
| #APP |
| #NO_APP |
| .loc 0 8 16 is_stmt 1 # live_across_call.c:8:16 |
| movl -4(%rbp), %edi |
| .Ltmp1: |
| #DEBUG_VALUE: live_across_call:x <- [DW_OP_LLVM_entry_value 1] $edi |
| .loc 0 8 11 is_stmt 0 # live_across_call.c:8:11 |
| callq leaf@PLT |
| .Ltmp2: |
| #DEBUG_VALUE: live_across_call:r <- $eax |
| .loc 0 9 26 is_stmt 1 # live_across_call.c:9:26 |
| movl -4(%rbp), %ecx |
| .loc 0 9 3 is_stmt 0 # live_across_call.c:9:3 |
| #APP |
| #NO_APP |
| .loc 0 10 12 is_stmt 1 # live_across_call.c:10:12 |
| addl -4(%rbp), %eax |
| .Ltmp3: |
| .loc 0 10 3 epilogue_begin is_stmt 0 # live_across_call.c:10:3 |
| addq $16, %rsp |
| popq %rbp |
| .cfi_def_cfa %rsp, 8 |
| retq |
| .Ltmp4: |
| .Lfunc_end0: |
| .size live_across_call, .Lfunc_end0-live_across_call |
| .cfi_endproc |
| # -- End function |
| .section .debug_loclists,"",@progbits |
| .long .Ldebug_list_header_end0-.Ldebug_list_header_start0 # Length |
| .Ldebug_list_header_start0: |
| .short 5 # Version |
| .byte 8 # Address size |
| .byte 0 # Segment selector size |
| .long 2 # Offset entry count |
| .Lloclists_table_base0: |
| .long .Ldebug_loc0-.Lloclists_table_base0 |
| .long .Ldebug_loc1-.Lloclists_table_base0 |
| .Ldebug_loc0: |
| .byte 4 # DW_LLE_offset_pair |
| .uleb128 .Lfunc_begin0-.Lfunc_begin0 # starting offset |
| .uleb128 .Ltmp1-.Lfunc_begin0 # ending offset |
| .byte 1 # Loc expr size |
| .byte 85 # super-register DW_OP_reg5 |
| .byte 4 # DW_LLE_offset_pair |
| .uleb128 .Ltmp1-.Lfunc_begin0 # starting offset |
| .uleb128 .Lfunc_end0-.Lfunc_begin0 # ending offset |
| .byte 4 # Loc expr size |
| .byte 163 # DW_OP_entry_value |
| .byte 1 # 1 |
| .byte 85 # super-register DW_OP_reg5 |
| .byte 159 # DW_OP_stack_value |
| .byte 0 # DW_LLE_end_of_list |
| .Ldebug_loc1: |
| .byte 4 # DW_LLE_offset_pair |
| .uleb128 .Ltmp2-.Lfunc_begin0 # starting offset |
| .uleb128 .Ltmp3-.Lfunc_begin0 # ending offset |
| .byte 1 # Loc expr size |
| .byte 80 # super-register DW_OP_reg0 |
| .byte 0 # DW_LLE_end_of_list |
| .Ldebug_list_header_end0: |
| .section .debug_abbrev,"",@progbits |
| .byte 1 # Abbreviation Code |
| .byte 17 # DW_TAG_compile_unit |
| .byte 1 # DW_CHILDREN_yes |
| .byte 37 # DW_AT_producer |
| .byte 37 # DW_FORM_strx1 |
| .byte 19 # DW_AT_language |
| .byte 5 # DW_FORM_data2 |
| .byte 3 # DW_AT_name |
| .byte 37 # DW_FORM_strx1 |
| .byte 114 # DW_AT_str_offsets_base |
| .byte 23 # DW_FORM_sec_offset |
| .byte 16 # DW_AT_stmt_list |
| .byte 23 # DW_FORM_sec_offset |
| .byte 27 # DW_AT_comp_dir |
| .byte 37 # DW_FORM_strx1 |
| .byte 17 # DW_AT_low_pc |
| .byte 27 # DW_FORM_addrx |
| .byte 18 # DW_AT_high_pc |
| .byte 6 # DW_FORM_data4 |
| .byte 115 # DW_AT_addr_base |
| .byte 23 # DW_FORM_sec_offset |
| .ascii "\214\001" # DW_AT_loclists_base |
| .byte 23 # DW_FORM_sec_offset |
| .byte 0 # EOM(1) |
| .byte 0 # EOM(2) |
| .byte 2 # Abbreviation Code |
| .byte 46 # DW_TAG_subprogram |
| .byte 1 # DW_CHILDREN_yes |
| .byte 17 # DW_AT_low_pc |
| .byte 27 # DW_FORM_addrx |
| .byte 18 # DW_AT_high_pc |
| .byte 6 # DW_FORM_data4 |
| .byte 64 # DW_AT_frame_base |
| .byte 24 # DW_FORM_exprloc |
| .byte 122 # DW_AT_call_all_calls |
| .byte 25 # DW_FORM_flag_present |
| .byte 3 # DW_AT_name |
| .byte 37 # DW_FORM_strx1 |
| .byte 58 # DW_AT_decl_file |
| .byte 11 # DW_FORM_data1 |
| .byte 59 # DW_AT_decl_line |
| .byte 11 # DW_FORM_data1 |
| .byte 39 # DW_AT_prototyped |
| .byte 25 # DW_FORM_flag_present |
| .byte 73 # DW_AT_type |
| .byte 19 # DW_FORM_ref4 |
| .byte 63 # DW_AT_external |
| .byte 25 # DW_FORM_flag_present |
| .byte 0 # EOM(1) |
| .byte 0 # EOM(2) |
| .byte 3 # Abbreviation Code |
| .byte 5 # DW_TAG_formal_parameter |
| .byte 0 # DW_CHILDREN_no |
| .byte 2 # DW_AT_location |
| .byte 34 # DW_FORM_loclistx |
| .byte 3 # DW_AT_name |
| .byte 37 # DW_FORM_strx1 |
| .byte 58 # DW_AT_decl_file |
| .byte 11 # DW_FORM_data1 |
| .byte 59 # DW_AT_decl_line |
| .byte 11 # DW_FORM_data1 |
| .byte 73 # DW_AT_type |
| .byte 19 # DW_FORM_ref4 |
| .byte 0 # EOM(1) |
| .byte 0 # EOM(2) |
| .byte 4 # Abbreviation Code |
| .byte 52 # DW_TAG_variable |
| .byte 0 # DW_CHILDREN_no |
| .byte 2 # DW_AT_location |
| .byte 24 # DW_FORM_exprloc |
| .byte 3 # DW_AT_name |
| .byte 37 # DW_FORM_strx1 |
| .byte 58 # DW_AT_decl_file |
| .byte 11 # DW_FORM_data1 |
| .byte 59 # DW_AT_decl_line |
| .byte 11 # DW_FORM_data1 |
| .byte 73 # DW_AT_type |
| .byte 19 # DW_FORM_ref4 |
| .byte 0 # EOM(1) |
| .byte 0 # EOM(2) |
| .byte 5 # Abbreviation Code |
| .byte 52 # DW_TAG_variable |
| .byte 0 # DW_CHILDREN_no |
| .byte 2 # DW_AT_location |
| .byte 34 # DW_FORM_loclistx |
| .byte 3 # DW_AT_name |
| .byte 37 # DW_FORM_strx1 |
| .byte 58 # DW_AT_decl_file |
| .byte 11 # DW_FORM_data1 |
| .byte 59 # DW_AT_decl_line |
| .byte 11 # DW_FORM_data1 |
| .byte 73 # DW_AT_type |
| .byte 19 # DW_FORM_ref4 |
| .byte 0 # EOM(1) |
| .byte 0 # EOM(2) |
| .byte 6 # Abbreviation Code |
| .byte 72 # DW_TAG_call_site |
| .byte 0 # DW_CHILDREN_no |
| .byte 127 # DW_AT_call_origin |
| .byte 19 # DW_FORM_ref4 |
| .byte 125 # DW_AT_call_return_pc |
| .byte 27 # DW_FORM_addrx |
| .byte 0 # EOM(1) |
| .byte 0 # EOM(2) |
| .byte 7 # Abbreviation Code |
| .byte 46 # DW_TAG_subprogram |
| .byte 1 # DW_CHILDREN_yes |
| .byte 3 # DW_AT_name |
| .byte 37 # DW_FORM_strx1 |
| .byte 58 # DW_AT_decl_file |
| .byte 11 # DW_FORM_data1 |
| .byte 59 # DW_AT_decl_line |
| .byte 11 # DW_FORM_data1 |
| .byte 39 # DW_AT_prototyped |
| .byte 25 # DW_FORM_flag_present |
| .byte 73 # DW_AT_type |
| .byte 19 # DW_FORM_ref4 |
| .byte 60 # DW_AT_declaration |
| .byte 25 # DW_FORM_flag_present |
| .byte 63 # DW_AT_external |
| .byte 25 # DW_FORM_flag_present |
| .byte 0 # EOM(1) |
| .byte 0 # EOM(2) |
| .byte 8 # Abbreviation Code |
| .byte 5 # DW_TAG_formal_parameter |
| .byte 0 # DW_CHILDREN_no |
| .byte 73 # DW_AT_type |
| .byte 19 # DW_FORM_ref4 |
| .byte 0 # EOM(1) |
| .byte 0 # EOM(2) |
| .byte 9 # Abbreviation Code |
| .byte 36 # DW_TAG_base_type |
| .byte 0 # DW_CHILDREN_no |
| .byte 3 # DW_AT_name |
| .byte 37 # DW_FORM_strx1 |
| .byte 62 # DW_AT_encoding |
| .byte 11 # DW_FORM_data1 |
| .byte 11 # DW_AT_byte_size |
| .byte 11 # DW_FORM_data1 |
| .byte 0 # EOM(1) |
| .byte 0 # EOM(2) |
| .byte 10 # Abbreviation Code |
| .byte 53 # DW_TAG_volatile_type |
| .byte 0 # DW_CHILDREN_no |
| .byte 73 # DW_AT_type |
| .byte 19 # DW_FORM_ref4 |
| .byte 0 # EOM(1) |
| .byte 0 # EOM(2) |
| .byte 0 # EOM(3) |
| .section .debug_info,"",@progbits |
| .Lcu_begin0: |
| .long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit |
| .Ldebug_info_start0: |
| .short 5 # DWARF version number |
| .byte 1 # DWARF Unit Type |
| .byte 8 # Address Size (in bytes) |
| .long .debug_abbrev # Offset Into Abbrev. Section |
| .byte 1 # Abbrev [1] 0xc:0x66 DW_TAG_compile_unit |
| .byte 0 # DW_AT_producer |
| .short 29 # DW_AT_language |
| .byte 1 # DW_AT_name |
| .long .Lstr_offsets_base0 # DW_AT_str_offsets_base |
| .long .Lline_table_start0 # DW_AT_stmt_list |
| .byte 2 # DW_AT_comp_dir |
| .byte 0 # DW_AT_low_pc |
| .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc |
| .long .Laddr_table_base0 # DW_AT_addr_base |
| .long .Lloclists_table_base0 # DW_AT_loclists_base |
| .byte 2 # Abbrev [2] 0x27:0x33 DW_TAG_subprogram |
| .byte 0 # DW_AT_low_pc |
| .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc |
| .byte 1 # DW_AT_frame_base |
| .byte 86 |
| # DW_AT_call_all_calls |
| .byte 5 # DW_AT_name |
| .byte 0 # DW_AT_decl_file |
| .byte 5 # DW_AT_decl_line |
| # DW_AT_prototyped |
| .long 104 # DW_AT_type |
| # DW_AT_external |
| .byte 3 # Abbrev [3] 0x36:0x9 DW_TAG_formal_parameter |
| .byte 0 # DW_AT_location |
| .byte 7 # DW_AT_name |
| .byte 0 # DW_AT_decl_file |
| .byte 5 # DW_AT_decl_line |
| .long 104 # DW_AT_type |
| .byte 4 # Abbrev [4] 0x3f:0xb DW_TAG_variable |
| .byte 2 # DW_AT_location |
| .byte 145 |
| .byte 124 |
| .byte 6 # DW_AT_name |
| .byte 0 # DW_AT_decl_file |
| .byte 6 # DW_AT_decl_line |
| .long 108 # DW_AT_type |
| .byte 5 # Abbrev [5] 0x4a:0x9 DW_TAG_variable |
| .byte 1 # DW_AT_location |
| .byte 8 # DW_AT_name |
| .byte 0 # DW_AT_decl_file |
| .byte 8 # DW_AT_decl_line |
| .long 104 # DW_AT_type |
| .byte 6 # Abbrev [6] 0x53:0x6 DW_TAG_call_site |
| .long 90 # DW_AT_call_origin |
| .byte 1 # DW_AT_call_return_pc |
| .byte 0 # End Of Children Mark |
| .byte 7 # Abbrev [7] 0x5a:0xe DW_TAG_subprogram |
| .byte 3 # DW_AT_name |
| .byte 0 # DW_AT_decl_file |
| .byte 2 # DW_AT_decl_line |
| # DW_AT_prototyped |
| .long 104 # DW_AT_type |
| # DW_AT_declaration |
| # DW_AT_external |
| .byte 8 # Abbrev [8] 0x62:0x5 DW_TAG_formal_parameter |
| .long 104 # DW_AT_type |
| .byte 0 # End Of Children Mark |
| .byte 9 # Abbrev [9] 0x68:0x4 DW_TAG_base_type |
| .byte 4 # DW_AT_name |
| .byte 5 # DW_AT_encoding |
| .byte 4 # DW_AT_byte_size |
| .byte 10 # Abbrev [10] 0x6c:0x5 DW_TAG_volatile_type |
| .long 104 # DW_AT_type |
| .byte 0 # End Of Children Mark |
| .Ldebug_info_end0: |
| .section .debug_str_offsets,"",@progbits |
| .long 40 # Length of String Offsets Set |
| .short 5 |
| .short 0 |
| .Lstr_offsets_base0: |
| .section .debug_str,"MS",@progbits,1 |
| .Linfo_string0: |
| .asciz "clang version 22.0.0git (https://github.com/UltimateForce21/llvm-project.git 79c0a9e1e7da0f727c41d27c9c6ff8a28bb7d06f)" # string offset=0 |
| .Linfo_string1: |
| .asciz "live_across_call.c" # string offset=119 |
| .Linfo_string2: |
| .asciz "." # string offset=138 |
| .Linfo_string3: |
| .asciz "leaf" # string offset=140 |
| .Linfo_string4: |
| .asciz "int" # string offset=145 |
| .Linfo_string5: |
| .asciz "live_across_call" # string offset=149 |
| .Linfo_string6: |
| .asciz "a" # string offset=166 |
| .Linfo_string7: |
| .asciz "x" # string offset=168 |
| .Linfo_string8: |
| .asciz "r" # string offset=170 |
| .section .debug_str_offsets,"",@progbits |
| .long .Linfo_string0 |
| .long .Linfo_string1 |
| .long .Linfo_string2 |
| .long .Linfo_string3 |
| .long .Linfo_string4 |
| .long .Linfo_string5 |
| .long .Linfo_string6 |
| .long .Linfo_string7 |
| .long .Linfo_string8 |
| .section .debug_addr,"",@progbits |
| .long .Ldebug_addr_end0-.Ldebug_addr_start0 # Length of contribution |
| .Ldebug_addr_start0: |
| .short 5 # DWARF version number |
| .byte 8 # Address size |
| .byte 0 # Segment selector size |
| .Laddr_table_base0: |
| .quad .Lfunc_begin0 |
| .quad .Ltmp2 |
| .Ldebug_addr_end0: |
| .ident "clang version 22.0.0git (https://github.com/UltimateForce21/llvm-project.git 79c0a9e1e7da0f727c41d27c9c6ff8a28bb7d06f)" |
| .section ".note.GNU-stack","",@progbits |
| .addrsig |
| .section .debug_line,"",@progbits |
| .Lline_table_start0: |
