derek.holloway
7502bf64a4
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67 lines
1.6 KiB
ArmAsm
67 lines
1.6 KiB
ArmAsm
## This checks that we don't create an invalid CFG when there is an
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## unreachable direct jump right after an indirect one.
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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 -nostdlib
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# RUN: llvm-bolt %t.exe -o %t.out --data %t.fdata \
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# RUN: --eliminate-unreachable --print-cfg | FileCheck %s
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.globl _start
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.type _start, %function
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_start:
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.cfi_startproc
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# FDATA: 0 [unknown] 0 1 _start 0 0 1
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push %rbp
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mov %rsp, %rbp
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push %rbx
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push %r14
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subq $0x20, %rsp
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movq %rdi, %rcx
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b:
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jmpq *JUMP_TABLE(,%rcx,8)
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# FDATA: 1 _start #b# 1 _start #hotpath# 0 20
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## Unreachable direct jump here. Our CFG should still make sense and properly
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## place this instruction in a new basic block.
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jmp .lbb2
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.lbb1: je .lexit
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.lbb2:
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xorq %rax, %rax
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addq $0x20, %rsp
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pop %r14
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pop %rbx
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pop %rbp
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ret
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hotpath:
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movq $2, %rax
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addq $0x20, %rsp
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pop %r14
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pop %rbx
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pop %rbp
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ret
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.lexit:
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movq $1, %rax
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addq $0x20, %rsp
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pop %r14
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pop %rbx
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pop %rbp
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ret
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.cfi_endproc
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.size _start, .-_start
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.rodata
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.globl JUMP_TABLE
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JUMP_TABLE:
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.quad .lbb1
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.quad .lbb2
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.quad hotpath
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## No basic blocks above should have 4 successors! That is a bug.
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# CHECK-NOT: Successors: {{.*}} (mispreds: 0, count: 20), {{.*}} (mispreds: 0, count: 0), {{.*}} (mispreds: 0, count: 0), {{.*}} (mispreds: 0, count: 0)
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# Check successful removal of stray direct jmp
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# CHECK: UCE removed 1 block
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