search for: ltmp20

I've been building/dumping some x86_64 code and I've noticed that each of the routines has 3 temporary symbols, à la: _main: pushq %rbp Ltmp18: movq %rsp, %rbp Ltmp19: subq $320, %rsp Ltmp20: movl %ecx, -276(%rbp) I've tracked them back to emitPrologue in X86RegisterInfo.cpp. I'm wonder what's their purpose? They're filling up my symbol table... Cameron Esfahani dirty at apple.com "All that is necessary for the triumph of evil is that good men do nothing.&quo...

On Aug 3, 2010, at 3:04 PM, Cameron Esfahani wrote: > I've been building/dumping some x86_64 code and I've noticed that each of the routines has 3 temporary symbols, à la: > > _main: > pushq %rbp > Ltmp18: > movq %rsp, %rbp > Ltmp19: > subq $320, %rsp > Ltmp20: > movl %ecx, -276(%rbp) > > I've tracked them back to emitPrologue in X86RegisterInfo.cpp. I'm wonder what's their purpose? > > They're filling up my symbol table... EH ranges for unwind info. If you look later on in the file for the symbols you'll see the...

...Esfahani wrote: > >> I've been building/dumping some x86_64 code and I've noticed that each of the routines has 3 temporary symbols, à la: >> >> _main: >> pushq %rbp >> Ltmp18: >> movq %rsp, %rbp >> Ltmp19: >> subq $320, %rsp >> Ltmp20: >> movl %ecx, -276(%rbp) >> >> I've tracked them back to emitPrologue in X86RegisterInfo.cpp. I'm wonder what's their purpose? >> >> They're filling up my symbol table... > > > EH ranges for unwind info. If you look later on in the file...

...e Folded Reload addsd 72(%esp), %xmm2 # 8-byte Folded Reload addsd %xmm2, %xmm0 adcl $0, %esi cmpl %eax, %edi movl %edi, %ebx jne .LBB1_2 .LBB1_3: # %._crit_edge movsd %xmm0, 80(%esp) fldl 80(%esp) addl $88, %esp popl %esi popl %edi popl %ebx ret .Ltmp20: .size foo, .Ltmp20-foo .Ltmp21: .cfi_endproc .Leh_func_end1: ====== Output B ====== ====================== foo: # @foo .Ltmp11: .cfi_startproc # BB#0: pushl %edi .Ltmp12: .cfi_def_cfa_offset 8 pushl %esi .Ltmp13: .cfi_def_cfa_offset 12 subl $12, %esp ....

...e Folded Reload addsd 72(%esp), %xmm2 # 8-byte Folded Reload addsd %xmm2, %xmm0 adcl $0, %esi cmpl %eax, %edi movl %edi, %ebx jne .LBB1_2 .LBB1_3: # %._crit_edge movsd %xmm0, 80(%esp) fldl 80(%esp) addl $88, %esp popl %esi popl %edi popl %ebx ret .Ltmp20: .size foo, .Ltmp20-foo .Ltmp21: .cfi_endproc .Leh_func_end1: ====== Output B ====== ====================== foo: # @foo .Ltmp11: .cfi_startproc # BB#0: pushl %edi .Ltmp12: .cfi_def_cfa_offset 8 pushl %esi .Ltmp13: .cfi_def_cfa_offset 12 subl $12, %esp ....

...Esfahani wrote: > >> I've been building/dumping some x86_64 code and I've noticed that each of the routines has 3 temporary symbols, à la: >> >> _main: >> pushq %rbp >> Ltmp18: >> movq %rsp, %rbp >> Ltmp19: >> subq $320, %rsp >> Ltmp20: >> movl %ecx, -276(%rbp) >> >> I've tracked them back to emitPrologue in X86RegisterInfo.cpp. I'm wonder what's their purpose? >> >> They're filling up my symbol table... > > > EH ranges for unwind info. If you look later on in the file...

...ction meh: # @meh .Ltmp16: .cfi_startproc .Lfunc_begin1: .loc 1 18 0 # a.c:18:0 # BB#0: pushl %ebp .Ltmp17: .cfi_def_cfa_offset 8 .Ltmp18: .cfi_offset %ebp, -8 movl %esp, %ebp .Ltmp19: .cfi_def_cfa_register %ebp pushl %ebx subl $20, %esp .Ltmp20: .cfi_offset %ebx, -12 calll .L1$pb .L1$pb: popl %eax .Ltmp21: addl $_GLOBAL_OFFSET_TABLE_+(.Ltmp21-.L1$pb), %eax movl 8(%ebp), %ecx leal .L.str1 at GOTOFF(%eax), %edx movl %ecx, -8(%ebp) .loc 1 19 2 prologue_end # a.c:19:2 .Ltmp22: movl -8(%ebp), %ecx movl %edx, (%esp) movl %ecx, 4(...