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[MC/ELF] Accept zero for .align directive

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.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
This commit is contained in:
Davide Italiano 2015-09-08 18:59:47 +00:00
parent 708eee92f1
commit d9617dc535
2 changed files with 9 additions and 1 deletions
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6
lib/MC/MCParser/AsmParser.cpp
View File

@ -2706,7 +2706,11 @@ bool AsmParser::parseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
Alignment = 1ULL << Alignment;
} else {
// Reject alignments that aren't a power of two, for gas compatibility.
// Reject alignments that aren't either a power of two or zero,
// for gas compatibility. Alignment of zero is silently rounded
// up to one.
if (Alignment == 0)
Alignment = 1;
if (!isPowerOf2_64(Alignment))
Error(AlignmentLoc, "alignment must be a power of 2");
}

4
test/MC/ELF/align-zero.s Normal file
View File

@ -0,0 +1,4 @@
// Test that an alignment of zero is accepted.
// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o -
.align 0