search for: cfi_def_cfa_regist

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2019 Feb 05
2
clang emits calls to consexpr function.
...x = product(); return 0; } $./clang test.cpp -std=c++11 -S $./clang -v clang version 9.0.0 Target: x86_64-unknown-linux-gnu $cat test.s main: .cfi_startproc # %bb.0: pushq %rbp .cfi_def_cfa_offset 16 .cfi_offset %rbp, -16 movq %rsp, %rbp .cfi_def_cfa_register %rbp subq $16, %rsp movl $0, -4(%rbp) callq _Z7productv //here you can see the calls to product function xorl %ecx, %ecx movl %eax, -8(%rbp) movl %ecx, %eax addq $16, %rsp popq %rbp .cfi_def_cfa %rsp...
2012 Mar 02
3
[LLVMdev] how to annotate assembler
...sed when assembler was generated. For example: double test(long long s) { return s; } gcc -S -dp -O0 test.c test: .LFB0: .cfi_startproc pushq %rbp # 18 *pushdi2_rex64/1 [length = 1] .cfi_def_cfa_offset 16 movq %rsp, %rbp # 19 *movdi_1_rex64/2 [length = 3] .cfi_offset 6, -16 .cfi_def_cfa_register 6 movq %rdi, -8(%rbp) # 2 *movdi_1_rex64/4 [length = 4] cvtsi2sdq -8(%rbp), %xmm0 # 6 *floatdidf2_sse_interunit/2 [length = 6] leave # 24 leave_rex64 [length = 1] .cfi_def_cfa 7, 8 ret # 25 return_internal [length = 1] .cfi_endproc Now I may look into config/i386/i386.md, and lo...
2012 May 24
4
[LLVMdev] use AVX automatically if present
....type _fun1, at function _fun1: # @_fun1 .cfi_startproc # BB#0: # %_L1 pushq %rbp .Ltmp2: .cfi_def_cfa_offset 16 .Ltmp3: .cfi_offset %rbp, -16 movq %rsp, %rbp .Ltmp4: .cfi_def_cfa_register %rbp vmovaps (%rdi), %ymm0 vaddps (%rsi), %ymm0, %ymm0 vmovaps %ymm0, (%rdi) popq %rbp vzeroupper ret .Ltmp5: .size _fun1, .Ltmp5-_fun1 .cfi_endproc .section ".note.GNU-stack","", a...
2012 Mar 02
0
[LLVMdev] how to annotate assembler
...t;MCOperand Reg:106>> Ltmp2: .cfi_def_cfa_offset 16 Ltmp3: .cfi_offset %rbp, -16 movq %rsp, %rbp ## <MCInst #1491 MOV64rr ## <MCOperand Reg:106> ## <MCOperand Reg:114>> Ltmp4: .cfi_def_cfa_register %rbp movq %rdi, -8(%rbp) ## <MCInst #1482 MOV64mr ## <MCOperand Reg:106> ## <MCOperand Imm:1> ## <MCOperand Reg:0>...
2018 Sep 14
2
Function calls keep increasing the stack usage
...mmand line, etc). > > bar: # @bar > .cfi_startproc > # %bb.0: # %entry > pushq %rbp > .cfi_def_cfa_offset 16 > .cfi_offset %rbp, -16 > movq %rsp, %rbp > .cfi_def_cfa_register %rbp > subq $16, %rsp > movl $1, %edi > movl $2, %esi > callq foo > movl $3, %edi > movl $4, %esi > movl %eax, -4(%rbp) # 4-byte Spill > callq foo > movl %eax, -8(%...
2019 Aug 08
2
Suboptimal code generated by clang+llc in quite a common scenario (?)
...re i8 %k, i8* %arrayidx2, align 1, !tbaa !13 ret i32 0 } According to that, the variable ‘scscx’ is loaded three times despite it’s never modified. The resulting assembly code is this: .globl _tst _tst: .cfi_startproc pushl %ebp .cfi_def_cfa_offset 8 .cfi_offset %ebp, -8 movl %esp, %ebp .cfi_def_cfa_register %ebp pushl %esi .cfi_offset %esi, -12 movb 16(%ebp), %al movb 12(%ebp), %cl movb 8(%ebp), %dl movl _scscx, %esi movb %dl, (%esi) movl _scscx, %edx movb %cl, 1(%edx) movl _scscx, %ecx movb %al, 2(%ecx) xorl %eax, %eax popl %esi popl %ebp retl .cfi_endproc .comm _pp,3,0 .section...
2009 Aug 18
0
[LLVMdev] Build issues on Solaris
Hello, Nathan > or if it should be a configure test, which might be safer. Are there > any x86 platforms (other than apple) that don't need PLT-indirect calls? Yes, mingw. However just tweaking the define is not enough - we're not loading address of GOT into ebx before the call (on 32 bit ABIs) thus the call will be to nowhere. -- With best regards, Anton Korobeynikov Faculty of
2012 May 24
0
[LLVMdev] use AVX automatically if present
...: # @_fun1 > .cfi_startproc > # BB#0: # %_L1 > pushq %rbp > .Ltmp2: > .cfi_def_cfa_offset 16 > .Ltmp3: > .cfi_offset %rbp, -16 > movq %rsp, %rbp > .Ltmp4: > .cfi_def_cfa_register %rbp > vmovaps (%rdi), %ymm0 > vaddps (%rsi), %ymm0, %ymm0 > vmovaps %ymm0, (%rdi) > popq %rbp > vzeroupper > ret > .Ltmp5: > .size _fun1, .Ltmp5-_fun1 > .cfi_endproc > > > .section &qu...
2013 Sep 05
2
[LLVMdev] CFI Directives
...g right now is that I need to know how much the stack pointer was adjusted. So when I have something like this: .cfi_startproc Lfunc_begin175: pushq %rbp Ltmp1532: .cfi_def_cfa_offset 16 Ltmp1533: .cfi_offset %rbp, -16 movq %rsp, %rbp Ltmp1534: .cfi_def_cfa_register %rbp pushq %r15 pushq %r14 pushq %rbx subq $3224, %rsp ## imm = 0xC98 Ltmp1535: .cfi_offset %rbx, -40 Ltmp1536: .cfi_offset %r14, -32 Ltmp1537: .cfi_offset %r15, -24 I need to be able to know that `%rsp' was adjuste...
2018 Apr 12
3
[RFC] __builtin_constant_p() Improvements
...%edi, %edi movl $927, %ecx # imm = 0x39F movl $1, %eax cmovel %ecx, %eax retq And this code at -O0: bar: # @bar .cfi_startproc # %bb.0: # %entry pushq %rbp .cfi_def_cfa_offset 16 .cfi_offset %rbp, -16 movq %rsp, %rbp .cfi_def_cfa_register %rbp movl %edi, -16(%rbp) cmpl $0, -16(%rbp) je .LBB0_2 # %bb.1: # %if.then movl $42, -8(%rbp) movl $0, -4(%rbp) movl -4(%rbp), %eax movl %eax, -12(%rbp) jmp .LBB0_3 .LBB0_2: # %if.else movl $927, -12(%rbp) # imm = 0x39F .LBB0_...
2012 Jul 29
3
[LLVMdev] rotate
...t; .section __TEXT,__text,regular,pure_instructions > .globl _rotr > _rotr: ## @rotr > .cfi_startproc > ## BB#0: > pushq %rbp > Ltmp2: > .cfi_def_cfa_offset 16 > Ltmp3: > .cfi_offset %rbp, -16 > movq %rsp, %rbp > Ltmp4: > .cfi_def_cfa_register %rbp > movb %sil, %cl > rorl %cl, %edi<==== Rotate instruction > movl %edi, %eax > popq %rbp > ret > .cfi_endproc > .subsections_via_symbols > ====== > > I hope this helps. > > Michael > > On Jul 28, 2012, at 8:29 PM, reed kotler<rkotler at mi...
2009 Aug 25
2
[LLVMdev] Build issues on Solaris
...ck) ASMPREFIX "X86CompilationCallback:\n" CFI(".cfi_startproc\n") "pushl %ebp\n" + CFI(".cfi_def_cfa_offset 12\n") + CFI(".cfi_offset %ebp, -12\n") + "movl %esp, %ebp\n" // Standard prologue + CFI(".cfi_def_cfa_register %ebp\n") + "pushl %eax\n" + CFI(".cfi_rel_offset %eax, 0\n") + "pushl %edx\n" // Save EAX/EDX/ECX + CFI(".cfi_rel_offset %edx, 4\n") + "pushl %ecx\n" + CFI(".cfi_rel_offset %ecx, 8\n") + "pus...
2017 Aug 21
3
DragonEgg for GCC v8.x and LLVM v6.x is just able to work
....p2align 4, 0x90 .type foo, at function foo: # @foo .cfi_startproc # BB#0: # %entry pushq %rbp .Ltmp0: .cfi_def_cfa_offset 16 .Ltmp1: .cfi_offset %rbp, -16 movq %rsp, %rbp .Ltmp2: .cfi_def_cfa_register %rbp movl $.L.cst, %edi movl $.L.cst.1, %esi movl $4, %edx movl $__func__.2210, %ecx xorl %eax, %eax callq printf popq %rbp retq .Lfunc_end0: .size foo, .Lfunc_end0-foo .cfi_endproc .globl main .p2align 4,...
2015 Jan 23
2
[LLVMdev] X86TarIgetLowering::LowerToBT
> icc generates testq for 0-30 and btq for 31-63. > That seems like a small bug in the bit 31 case. You can’t use testq for bit 31, because the immediate gets sign-extended. You *can* use the 32b form, of course.
2012 Jul 29
0
[LLVMdev] rotate
...-c -S -Os -o - ====== yielding an assembly output of: ====== .section __TEXT,__text,regular,pure_instructions .globl _rotr _rotr: ## @rotr .cfi_startproc ## BB#0: pushq %rbp Ltmp2: .cfi_def_cfa_offset 16 Ltmp3: .cfi_offset %rbp, -16 movq %rsp, %rbp Ltmp4: .cfi_def_cfa_register %rbp movb %sil, %cl rorl %cl, %edi <==== Rotate instruction movl %edi, %eax popq %rbp ret .cfi_endproc .subsections_via_symbols ====== I hope this helps. Michael On Jul 28, 2012, at 8:29 PM, reed kotler <rkotler at mips.com> wrote: > in C or C++,...
2013 Jul 10
4
[LLVMdev] unaligned AVX store gets split into two instructions
...l creates: .section __TEXT,__text,regular,pure_instructions .globl _vstore .align 4, 0x90 _vstore: ## @vstore .cfi_startproc ## BB#0: ## %entry pushq %rbp Ltmp2: .cfi_def_cfa_offset 16 Ltmp3: .cfi_offset %rbp, -16 movq %rsp, %rbp Ltmp4: .cfi_def_cfa_register %rbp vmovups (%rdi), %ymm0 popq %rbp ret .cfi_endproc ---------------------------------------------------------------- Running llvm-33/bin/llc vstore.ll creates: .section __TEXT,__text,regular,pure_instructions .globl _main .align 4, 0x90 _main:...
2012 Jul 29
2
[LLVMdev] rotate
in C or C++, how can I get clang/llvm to try and do a "rotate". (want to test this code in the mips16 port) i.e. emit rotr node. tia. reed
2013 Sep 05
1
[LLVMdev] AVX calling convention?
...sses the argument on the stack. The callee, however, begins with __Z14convert_char16Dv16_s: ## @_Z14convert_char16Dv16_s .cfi_startproc ## BB#0: ## %entry pushq %rbp Ltmp2: .cfi_def_cfa_offset 16 Ltmp3: .cfi_offset %rbp, -16 movq %rsp, %rbp Ltmp4: .cfi_def_cfa_register %rbp vextractf128 $1, %ymm0, %xmm1 which expects the argument in %ymm0. However, the vzeroupper in the caller just destroyed part of %ymm0... My question is: What decides this calling convention? I know that standard x86-64 should pass arguments in %xmm0, not %ymm0. Are there e.g. command lin...
2013 Sep 06
0
[LLVMdev] CFI Directives
...pointer was adjusted. So when I have something like this: > > .cfi_startproc > Lfunc_begin175: > pushq %rbp > Ltmp1532: > .cfi_def_cfa_offset 16 > Ltmp1533: > .cfi_offset %rbp, -16 > movq %rsp, %rbp > Ltmp1534: > .cfi_def_cfa_register %rbp > pushq %r15 > pushq %r14 > pushq %rbx > subq $3224, %rsp ## imm = 0xC98 > Ltmp1535: > .cfi_offset %rbx, -40 > Ltmp1536: > .cfi_offset %r14, -32 > Ltmp1537: > .cfi_offset %r15, -24 >...
2012 Jul 29
0
[LLVMdev] rotate
...n intel shifts are mod the register size: ===== .section __TEXT,__text,regular,pure_instructions .globl _ror .align 4, 0x90 _ror: ## @ror .cfi_startproc ## BB#0: pushq %rbp Ltmp2: .cfi_def_cfa_offset 16 Ltmp3: .cfi_offset %rbp, -16 movq %rsp, %rbp Ltmp4: .cfi_def_cfa_register %rbp movl %edi, -4(%rbp) movq %rsi, -16(%rbp) movl -4(%rbp), %edi movq -16(%rbp), %rsi movl %esi, %eax movl %eax, %ecx ## kill: CL<def> ECX<kill> shrl %cl, %edi movl -4(%rbp), %eax movabsq $32, %rsi subq -16(%rbp), %rsi movl %esi, %ed...