derek.holloway
7502bf64a4
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61 lines
1.5 KiB
ArmAsm
61 lines
1.5 KiB
ArmAsm
# RUN: rm -rf %t && split-file %s %t && cd %t
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# RUN: llvm-mc -filetype=obj -triple x86_64 --x86-align-branch-boundary=32 --x86-align-branch=fused+jcc foo.s | llvm-objdump -d --no-show-raw-insn - | FileCheck foo.s
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# RUN: llvm-mc -filetype=obj -triple x86_64 --x86-align-branch-boundary=32 --x86-align-branch=fused+jcc -x86-pad-max-prefix-size=1 bar.s | llvm-objdump -d --no-show-raw-insn - | FileCheck bar.s
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# Exercise cases where fused instructions need to be aligned.
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#--- foo.s
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.text
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.globl foo
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foo:
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.p2align 5
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.rept 30
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int3
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.endr
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# 'cmp %rax, %rbp' is macro fused with 'jne foo',
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# so we need to align the pair.
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# CHECK: 20: cmpq %rax, %rbp
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# CHECK: 23: jne
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cmp %rax, %rbp
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jne foo
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int3
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.p2align 5
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.rept 28
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int3
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.endr
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# 'cmp %rax, %rbp' is fusible but can not fused with `jo foo`,
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# so we only need to align 'jo foo'.
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# CHECK: 5c: cmpq %rax, %rbp
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cmp %rax, %rbp
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# CHECK: 60: jo
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jo foo
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int3
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.p2align 5
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.rept 26
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int3
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.endr
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# The second 'cmp %rax, %rbp' is macro fused with 'jne foo'.
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cmp %rax, %rbp
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# CHECK: a0: cmpq %rax, %rbp
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# CHECK: a3: jne
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cmp %rax, %rbp
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jne foo
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int3
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# Exercise the case where fused instructions need to be aligned,
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# ensuring fusion is not broken by a NOP
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#--- bar.s
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.text
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.globl bar
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bar:
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.nops 27
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# CHECK: 20: testq %rcx, %rcx
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# CHECK: 23: je
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testq %rcx, %rcx
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je .EXIT
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.EXIT:
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ret
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