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| author | JF Bastien <jfb@google.com> | 2013-05-17 23:49:01 +0000 |
|---|---|---|
| committer | JF Bastien <jfb@google.com> | 2013-05-17 23:49:01 +0000 |
| commit | bab06ba696694e7f62f964af7ee5290a13f78340 (patch) | |
| tree | 5e253bd087fd639188bf69b6b15a9cc9604c88d7 /lib/CodeGen | |
| parent | 637cb17a3d65b46f48ae8dfd012057e6c9d00c2b (diff) | |
| download | llvm-bab06ba696694e7f62f964af7ee5290a13f78340.tar.gz llvm-bab06ba696694e7f62f964af7ee5290a13f78340.tar.bz2 llvm-bab06ba696694e7f62f964af7ee5290a13f78340.tar.xz | |
Support unaligned load/store on more ARM targets
This patch matches GCC behavior: the code used to only allow unaligned
load/store on ARM for v6+ Darwin, it will now allow unaligned load/store
for v6+ Darwin as well as for v7+ on Linux and NaCl.
The distinction is made because v6 doesn't guarantee support (but LLVM
assumes that Apple controls hardware+kernel and therefore have
conformant v6 CPUs), whereas v7 does provide this guarantee (and
Linux/NaCl behave sanely).
The patch keeps the -arm-strict-align command line option, and adds
-arm-no-strict-align. They behave similarly to GCC's -mstrict-align and
-mnostrict-align.
I originally encountered this discrepancy in FastIsel tests which expect
unaligned load/store generation. Overall this should slightly improve
performance in most cases because of reduced I$ pressure.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182175 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
0 files changed, 0 insertions, 0 deletions