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[MC] Use LShr for constant evaluation of ">>" on ELF/arm64--darwin.

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This matches other assemblers and is less unexpected (e.g. PR23227).
On ELF, I tried binutils gas v2.24 and nasm 2.10.09, and they both
agree on LShr.  On COFF, I couldn't get my hands on an assembler yet,
so don't change the behavior.  For now, don't change it on non-AArch64
Darwin either, as the other assembler is gas v1.38, which does an AShr.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235963 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Ahmed Bougacha
2015-04-28 01:37:11 +00:00
parent fef483667f
commit e1f835ab59
8 changed files with 37 additions and 3 deletions
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5
lib/MC/MCAsmInfoDarwin.cpp
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@@ -93,4 +93,9 @@ MCAsmInfoDarwin::MCAsmInfoDarwin() {
UseIntegratedAssembler = true;
SetDirectiveSuppressesReloc = true;
// FIXME: For now keep the previous behavior, AShr, matching the previous
// behavior of as(1) (both -q and -Q: resp. LLVM and gas v1.38).
// If/when this changes, the AArch64 Darwin special case can go away.
UseLogicalShr = false;
}