forked from OSchip/llvm-project
61 lines
1.9 KiB
ArmAsm
Executable File
61 lines
1.9 KiB
ArmAsm
Executable File
# This reproduces a bug with shrink wrapping when trying to move
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# push-pops where restores were not validated to be POPs (and could be
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# a regular load, which violated our assumptions). Check that we
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# identify those cases.
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# REQUIRES: system-linux
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# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown \
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# RUN: %s -o %t.o
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# RUN: link_fdata %s %t.o %t.fdata
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# Delete our BB symbols so BOLT doesn't mark them as entry points
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# RUN: llvm-strip --strip-unneeded %t.o
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# RUN: %clang %cflags %t.o -o %t.exe -Wl,-q
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# RUN: llvm-bolt %t.exe -relocs=1 -frame-opt=all -print-finalized \
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# RUN: -print-only=main -data %t.fdata -o %t.out | FileCheck %s
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# RUN: %t.out
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# CHECK: BOLT-INFO: Shrink wrapping moved 1 spills inserting load/stores and 0 spills inserting push/pops
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.text
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.globl main
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.type main, %function
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.p2align 4
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main:
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# FDATA: 0 [unknown] 0 1 main 0 0 510
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pushq %rbp
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movq %rsp, %rbp
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pushq %rbx # We save rbx here, but there is an
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# opportunity to move it to .LBB2
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subq $0x18, %rsp
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cmpl $0x2, %edi
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.J1:
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jb .BBend
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# FDATA: 1 main #.J1# 1 main #.BB2# 0 10
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# FDATA: 1 main #.J1# 1 main #.BBend# 0 500
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.BB2:
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movq $2, %rbx # Use rbx in a cold block
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xorq %rax, %rax
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movb mystring, %al
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addq %rbx, %rax
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movb %al, mystring
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leaq mystring, %rdi
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# Avoid making the actual call here to allow push-pop mode to operate
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# without fear of an unknown function that may require aligned stack
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# callq puts
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.BBend:
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mov -0x08(%rbp), %rbx # Original restore is here. Instead of a pop
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# we use a load to reproduce gcc behavior while
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# using leave in epilogue. Ordinarily it would
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# addq $0x18, %rsp followed by pop %rbx
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xorq %rax, %rax
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leaveq
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retq
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.size main, .-main
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.data
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mystring: .asciz "0 is rbx mod 10 contents in decimal\n"
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