| # This reproduces a bug with shrink wrapping when trying to move |
| # push-pops where restores were not validated to be POPs (and could be |
| # a regular load, which violated our assumptions). Check that we |
| # identify those cases. |
| |
| # REQUIRES: system-linux |
| |
| # RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown \ |
| # RUN: %s -o %t.o |
| # RUN: link_fdata %s %t.o %t.fdata |
| # Delete our BB symbols so BOLT doesn't mark them as entry points |
| # RUN: llvm-strip --strip-unneeded %t.o |
| # RUN: %clang %cflags -no-pie %t.o -o %t.exe -Wl,-q |
| |
| # RUN: llvm-bolt %t.exe --relocs=1 --frame-opt=all --print-finalized \ |
| # RUN: --print-only=main --data %t.fdata -o %t.out | FileCheck %s |
| |
| # RUN: %t.out |
| |
| # CHECK: BOLT-INFO: Shrink wrapping moved 1 spills inserting load/stores and 0 spills inserting push/pops |
| |
| .text |
| .globl main |
| .type main, %function |
| .p2align 4 |
| main: |
| # FDATA: 0 [unknown] 0 1 main 0 0 510 |
| pushq %rbp |
| movq %rsp, %rbp |
| pushq %rbx # We save rbx here, but there is an |
| # opportunity to move it to .LBB2 |
| subq $0x18, %rsp |
| cmpl $0x2, %edi |
| .J1: |
| jb .BBend |
| # FDATA: 1 main #.J1# 1 main #.BB2# 0 10 |
| # FDATA: 1 main #.J1# 1 main #.BBend# 0 500 |
| .BB2: |
| movq $2, %rbx # Use rbx in a cold block |
| xorq %rax, %rax |
| movb mystring, %al |
| addq %rbx, %rax |
| movb %al, mystring |
| leaq mystring, %rdi |
| # Avoid making the actual call here to allow push-pop mode to operate |
| # without fear of an unknown function that may require aligned stack |
| # callq puts |
| |
| .BBend: |
| mov -0x08(%rbp), %rbx # Original restore is here. Instead of a pop |
| # we use a load to reproduce gcc behavior while |
| # using leave in epilogue. Ordinarily it would |
| # addq $0x18, %rsp followed by pop %rbx |
| xorq %rax, %rax |
| leaveq |
| retq |
| .size main, .-main |
| |
| .data |
| mystring: .asciz "0 is rbx mod 10 contents in decimal\n" |
