search for: ltmp18

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 th...

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...

...? I see nothing in the specs for "branch" or "switch". And __buildin_expect does nothing, that I am sure of. Unfortunately llvm has this knack for ordering my one most crucial part of code exactly the opposite I want to, it does: (x86_64) cmpq %r15, (%rax,%rdx) jne LBB0_3 Ltmp18: leaq 8(%rax,%rdx), %rcx jmp LBB0_4 LBB0_3: addq $8, %rcx LBB0_4: when I want, cmpq %r15, (%rax,%rdx) jeq LBB0_3 addq $8, %rcx jmp LBB0_4 LBB0_3: leaq 8(%rax,%rdx), %rcx LBB0_4: since that saves me executing a jump 99.9% of the time. Is there anything I can do ? Ciao Nat!

...0, at 3:12 PM, Eric Christopher wrote: > > 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...

...0, at 3:12 PM, Eric Christopher wrote: > > 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...

...== foo: # @foo .Ltmp12: .cfi_startproc # BB#0: pushl %ebx .Ltmp13: .cfi_def_cfa_offset 8 pushl %edi .Ltmp14: .cfi_def_cfa_offset 12 pushl %esi .Ltmp15: .cfi_def_cfa_offset 16 subl $88, %esp .Ltmp16: .cfi_def_cfa_offset 104 .Ltmp17: .cfi_offset %esi, -16 .Ltmp18: .cfi_offset %edi, -12 .Ltmp19: .cfi_offset %ebx, -8 pxor %xmm0, %xmm0 movl 112(%esp), %eax testl %eax, %eax je .LBB1_3 # BB#1: xorl %ebx, %ebx movl 108(%esp), %ecx movl 104(%esp), %edx xorl %esi, %esi .align 16, 0x90 .LBB1_2: # %.lr.ph.i...

...== foo: # @foo .Ltmp12: .cfi_startproc # BB#0: pushl %ebx .Ltmp13: .cfi_def_cfa_offset 8 pushl %edi .Ltmp14: .cfi_def_cfa_offset 12 pushl %esi .Ltmp15: .cfi_def_cfa_offset 16 subl $88, %esp .Ltmp16: .cfi_def_cfa_offset 104 .Ltmp17: .cfi_offset %esi, -16 .Ltmp18: .cfi_offset %edi, -12 .Ltmp19: .cfi_offset %ebx, -8 pxor %xmm0, %xmm0 movl 112(%esp), %eax testl %eax, %eax je .LBB1_3 # BB#1: xorl %ebx, %ebx movl 108(%esp), %ecx movl 104(%esp), %edx xorl %esi, %esi .align 16, 0x90 .LBB1_2: # %.lr.ph.i...

....Ltmp11-moo .Lfunc_end0: .Ltmp12: .cfi_endproc .Leh_func_end0: .globl meh .align 16, 0x90 .type meh, at function 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,...