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Allow targets to specify a minimum supported NOP size when performing NOP padding. If the desired padding is smaller than the supported NOP size,
we will enlarge the padding to make it work. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@162870 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -133,6 +133,13 @@ public:
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/// @}
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/// getMinimumNopSize - Returns the minimum size of a nop in bytes on this
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/// target. The assembler will use this to emit excess padding in situations
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/// where the padding required for simple alignment would be less than the
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/// minimum nop size.
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///
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virtual unsigned getMinimumNopSize() const { return 1; }
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/// writeNopData - Write an (optimal) nop sequence of Count bytes to the given
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/// output. If the target cannot generate such a sequence, it should return an
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/// error.
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@ -325,6 +325,12 @@ uint64_t MCAssembler::computeFragmentSize(const MCAsmLayout &Layout,
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const MCAlignFragment &AF = cast<MCAlignFragment>(F);
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unsigned Offset = Layout.getFragmentOffset(&AF);
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unsigned Size = OffsetToAlignment(Offset, AF.getAlignment());
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// If we are padding with nops, force the padding to be larger than the
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// minimum nop size.
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if (Size > 0 && AF.hasEmitNops()) {
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while (Size % getBackend().getMinimumNopSize())
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Size += AF.getAlignment();
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}
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if (Size > AF.getMaxBytesToEmit())
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return 0;
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return Size;
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