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Thumb's forced-PC-alignment requirement applies to the _total_ displacement, not just to the fragment relative

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portion.  While the fragment boundary is usually already aligned, it is possible for it not to be, which 
would lead to a non-aligned final displacement.

llvm-svn: 122091
This commit is contained in:
Owen Anderson 2010-12-17 21:49:48 +00:00
parent c2c6ebd82a
commit 900ac27338
1 changed files with 2 additions and 2 deletions
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4
lib/MC/MCAssembler.cpp
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@ -254,12 +254,12 @@ bool MCAssembler::EvaluateFixup(const MCAsmLayout &Layout,
"FKF_IsAlignedDownTo32Bits is only allowed on PC-relative fixups!");
if (IsPCRel) {
uint32_t Offset = Fixup.getOffset();
uint32_t Offset = Layout.getFragmentOffset(DF) + Fixup.getOffset();
// A number of ARM fixups in Thumb mode require that the effective PC
// address be determined as the 32-bit aligned version of the actual offset.
if (ShouldAlignPC) Offset &= ~0x3;
Value -= Layout.getFragmentOffset(DF) + Offset;
Value -= Offset;
}
// ARM fixups based from a thumb function address need to have the low