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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-01-14 00:54:10 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-01-14 00:54:10 +0000 |
| commit | 069e100f9a79a63db177a521fd790f4d77d1209c (patch) | |
| tree | e18a2e5782f83df4d10f5570cb72ff18e7be6bec /lib/Bitcode/Writer/ValueEnumerator.cpp | |
| parent | b7eaa130d05347b6e84fd25f1f59f85681be1ede (diff) | |
Don't fold insufficiently aligned ldr/str into ldm/stm instructions.
An unaligned ldr causes a trap, and is then emulated by the kernel with
awesome performance. The darwin kernel does not emulate unaligned ldm/stm
Thumb2 instructions, so don't generate them.
This fixes the miscompilation of Multisource/Applications/JM/lencod for Thumb2.
Generating unaligned ldr/str pairs from a 16-bit aligned memcpy is probably
also a bad idea, but that is beyond the scope of this patch.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93393 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Bitcode/Writer/ValueEnumerator.cpp')
0 files changed, 0 insertions, 0 deletions