derek.holloway
7502bf64a4
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48 lines
1.1 KiB
ArmAsm
48 lines
1.1 KiB
ArmAsm
# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o
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# RUN: llvm-objdump -d --no-show-raw-insn %t.o | FileCheck %s
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## In the initial all-short layout, `jmp target` has displacement -129 (1 beyond
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## [-128,127]). `je far_target` relaxes from 2B to 6B, shifting `target` by
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## +4B, and `.p2align 4` absorbs this growth. With fresh offsets, `jmp target`
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## sees displacement -125 and stays short (2B).
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##
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## The fused relaxation+layout computes alignment padding with fresh offsets,
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## so the backward jmp sees the correct displacement and stays short (2B).
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.text
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.p2align 4
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func:
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je far_target
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target:
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pushq %rbp
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pushq %rbx
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movl %edi, %ebx
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xorl %eax, %eax
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movq 8(%rsi), %rcx
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.rept 28
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testq %rcx, %rcx
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.endr
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jmp past_loop
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.p2align 4
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loop:
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movq (%r8), %r8
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testq %r8, %r8
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je after
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past_loop:
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cmpq %rdi, (%r8)
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jne loop
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cmpl %esi, 8(%r8)
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## The jmp stays short (2B). after is at 0x83, not 0x86.
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# CHECK: 81: jmp 0x6 <target>
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# CHECK-EMPTY:
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# CHECK-NEXT: 0000000000000083 <after>:
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jmp target
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after:
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popq %rbx
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popq %rbp
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ret
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.space 200
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far_target:
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ret
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