derek.holloway
7502bf64a4
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65 lines
2.2 KiB
ArmAsm
Executable File
65 lines
2.2 KiB
ArmAsm
Executable File
# This reproduces a bug with shrink wrapping when moving
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# load instructions in-between the lock prefix and another
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# instruction (where the lock prefix applies).
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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 -no-pie %t.o -o %t.exe -Wl,-q
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# RUN: llvm-bolt %t.exe --relocs=1 --frame-opt=all --print-fop \
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# RUN: --print-only=main --data %t.fdata -o %t.out | FileCheck %s
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# RUN: %t.out 1
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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. Save rbx will be moved
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# just before this instruction.
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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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callq puts
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lock add %r12,0x0(%rsp) # Put a lock in an unrelated instruction at the
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# dom. frontier where the restore will be moved to
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# We should not put the restore in-between the
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# lock and add! We typically avoid putting a
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# restore in the last BB instruction, but since
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# lock in llvm MC lib is considered a
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# separate instruction, we may mistakenly
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# put the restore just between these two.
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.BBend:
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addq $0x18, %rsp
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pop %rbx # Restore should be moved
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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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