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Revert "Support unaligned load/store on more ARM targets"

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This reverts r181898.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181944 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Derek Schuff 2013-05-15 23:07:43 +00:00
parent 2aa6db98df
commit 40df0d7a46
1 changed files with 4 additions and 17 deletions
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21
lib/Target/ARM/ARMSubtarget.cpp
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@ -162,23 +162,10 @@ void ARMSubtarget::resetSubtargetFeatures(StringRef CPU, StringRef FS) {
if (!isThumb() || hasThumb2())
PostRAScheduler = true;
if (!StrictAlign) {
// Assume pre-ARMv6 doesn't support unaligned accesses.
//
// ARMv6 may or may not support unaligned accesses depending on the
// SCTLR.U bit, which is architecture-specific. We assume ARMv6
// Darwin targets support unaligned accesses, and others don't.
//
// ARMv7 always has SCTLR.U set to 1, but it has a new SCTLR.A bit
// which raises an alignment fault on unaligned accesses. Linux
// defaults this bit to 0 and handles it as a system-wide (not
// per-process) setting. It is therefore safe to assume that ARMv7+
// targets support unaligned accesses.
//
// The above behavior is consistent with GCC.
if (hasV7Ops() || (hasV6Ops() && isTargetDarwin()))
AllowsUnalignedMem = true;
}
// v6+ may or may not support unaligned mem access depending on the system
// configuration.
if (!StrictAlign && hasV6Ops() && isTargetDarwin())
AllowsUnalignedMem = true;
// NEON f32 ops are non-IEEE 754 compliant. Darwin is ok with it by default.
uint64_t Bits = getFeatureBits();