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054db7df5b
Summary: When instruction bundling is enabled and the -mc-relax-all flag is set, we can write bundle padding directly into fragments and avoid creating large number of fragments significantly reducing LLVM MC memory usage. Test Plan: Regression test attached Reviewers: eliben Subscribers: jfb, mseaborn Differential Revision: http://reviews.llvm.org/D8072 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@234714 91177308-0d34-0410-b5e6-96231b3b80d8
36 lines
1.1 KiB
ArmAsm
36 lines
1.1 KiB
ArmAsm
# RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o - \
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# RUN: | llvm-objdump -disassemble -no-show-raw-insn - | FileCheck %s
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# RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu -mc-relax-all %s -o - \
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# RUN: | llvm-objdump -disassemble -no-show-raw-insn - | FileCheck %s
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# Test some variations of padding to the end of a bundle.
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.text
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foo:
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.bundle_align_mode 4
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# Each of these callq instructions is 5 bytes long
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callq bar
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callq bar
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.bundle_lock align_to_end
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callq bar
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.bundle_unlock
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# To align this group to a bundle end, we need a 1-byte NOP.
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# CHECK: a: nop
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# CHECK-NEXT: b: callq
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callq bar
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callq bar
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.bundle_lock align_to_end
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callq bar
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callq bar
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.bundle_unlock
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# Here we have to pad until the end of the *next* boundary because
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# otherwise the group crosses a boundary.
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# CHECK: 1a: nop
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# The nop sequence may be implemented as one instruction or many, but if
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# it's one instruction, that instruction cannot itself cross the boundary.
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# CHECK: 20: nop
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# CHECK-NEXT: 26: callq
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# CHECK-NEXT: 2b: callq
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