forked from OSchip/llvm-project
[MC/ELF] Accept zero for .align directive
.align directive refuses alignment 0 -- a comment in the code hints this is done for GNU as compatibility, but it seems GNU as accepts .align 0 (and silently rounds up alignment to 1). Differential Revision: http://reviews.llvm.org/D12682 llvm-svn: 247048
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@ -2706,7 +2706,11 @@ bool AsmParser::parseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
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Alignment = 1ULL << Alignment;
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} else {
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// Reject alignments that aren't a power of two, for gas compatibility.
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// Reject alignments that aren't either a power of two or zero,
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// for gas compatibility. Alignment of zero is silently rounded
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// up to one.
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if (Alignment == 0)
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Alignment = 1;
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if (!isPowerOf2_64(Alignment))
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Error(AlignmentLoc, "alignment must be a power of 2");
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}
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@ -0,0 +1,4 @@
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// Test that an alignment of zero is accepted.
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// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o -
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.align 0
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