derek.holloway
7502bf64a4
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65 lines
1.6 KiB
ArmAsm
Executable File
65 lines
1.6 KiB
ArmAsm
Executable File
# Test BOLT does not crash by trying to change the direction of a JRCXZ
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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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# 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 --reorder-blocks=ext-tsp --print-finalized \
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# RUN: -o %t.out --data %t.fdata | FileCheck %s
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# RUN: %t.out 1 2 3
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# CHECK: BOLT-INFO
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.text
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.section .text.startup,"ax",@progbits
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.p2align 5,,31
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.globl main
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.type main, %function
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main:
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jmp test_function
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.globl test_function
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.hidden test_function
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.type test_function,@function
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.align 32
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test_function:
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# FDATA: 0 main 0 1 test_function 0 0 510
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xorq %rcx, %rcx
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andq $3, %rdi
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jmpq *jumptbl(,%rdi,8)
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# Here are the 4 possible targets of the indirect branch to simulate a simple
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# CFG. What is important here is that BB1, the first block, conditionally
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# transfers control to the exit block with JRCXZ (.J1). We create a mock profile
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# saying that this branch is taken more often than not, causing BOLT to try to
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# put the exit block after it, which would require us to change the direction
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# of JRCXZ.
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.BB1:
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movl $0x0, %eax
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.J1:
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jrcxz .BBend
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# FDATA: 1 test_function #.J1# 1 test_function #.BB2# 0 10
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# FDATA: 1 test_function #.J1# 1 test_function #.BBend# 0 500
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.BB2:
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movl $0x2, %eax
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jmp .BBend
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.Lbb3:
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movl $0x3, %eax
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jmp .BBend
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.Lbb4:
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movl $0x4, %eax
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.BBend:
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retq
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.Lend1:
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.section .rodata
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.globl jumptbl
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jumptbl:
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.quad .BB1
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.quad .BB2
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.quad .Lbb3
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.quad .Lbb4
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