bolt/test/X86/frame-opt-lea.s

   1 # This checks that frame optimizer does not try to optimize away caller-saved
   2 # regs when we do not have complete aliasing info (when there is an LEA
   3 # instruction and the function does arithmetic with stack addresses).
   4
   5
   6 # REQUIRES: system-linux
   7
   8 # RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown \
   9 # RUN:   %s -o %t.o
  10 # RUN: link_fdata %s %t.o %t.fdata
  11 # RUN: llvm-strip --strip-unneeded %t.o
  12 # RUN: %clang %cflags %t.o -o %t.exe -Wl,-q -nostdlib
  13 # RUN: llvm-bolt %t.exe -relocs -o %t.out -data %t.fdata \
  14 # RUN:     -frame-opt=all -simplify-conditional-tail-calls=false \
  15 # RUN:     -lite=0 -eliminate-unreachable=false | FileCheck %s
  16 # RUN: llvm-objdump -d %t.out --print-imm-hex | \
  17 # RUN:   FileCheck --check-prefix CHECK-OBJDUMP %s
  18
  19   .globl foo
  20   .type foo, %function
  21 foo:
  22   .cfi_startproc
  23   movq $0, (%rsi)
  24   ret
  25   .cfi_endproc
  26   .size foo, .-foo
  27
  28
  29   .globl _start
  30   .type _start, %function
  31 _start:
  32   .cfi_startproc
  33 # FDATA: 0 [unknown] 0 1 _start 0 0 1
  34   push  %rbp
  35   mov   %rsp, %rbp
  36   subq  $0x20, %rsp
  37   je  b
  38 c:
  39   addq  $0x20, %rsp
  40   pop %rbp
  41   ret
  42 b:
  43   movq %rdi, %r13
  44   movq %r13, -0x08(%rbp)
  45   leaq -0x08(%rbp), %rsi
  46   callq foo
  47   movq -0x08(%rbp), %r13
  48   jmp c
  49   .cfi_endproc
  50   .size _start, .-_start
  51
  52
  53 # CHECK:   BOLT-INFO: FOP deleted 0 load(s) (dyn count: 0) and 0 store(s)
  54
  55 # CHECK-OBJDUMP:     <_start>:
  56 # CHECK-OBJDUMP:         movq    %rdi, %r13
  57 # CHECK-OBJDUMP-NEXT:    movq    %r13, -0x8(%rbp)
  58 # CHECK-OBJDUMP-NEXT:    leaq
  59 # CHECK-OBJDUMP-NEXT:    callq
  60 # CHECK-OBJDUMP-NEXT:    movq    -0x8(%rbp), %r13