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| author | Hans Wennborg <hans@hanshq.net> | 2015-12-04 23:00:33 +0000 |
|---|---|---|
| committer | Hans Wennborg <hans@hanshq.net> | 2015-12-04 23:00:33 +0000 |
| commit | 5000ce8a632c701aba09ddfa6d4bc33ae1b6f5a5 (patch) | |
| tree | ae02f06e6e57385712e8cd41ded1a8af676109a6 /lldb/packages/Python/lldbsuite | |
| parent | 3e9e7d28225fd7d262c660cf19429930d3bc2991 (diff) | |
| download | bcm5719-llvm-5000ce8a632c701aba09ddfa6d4bc33ae1b6f5a5.tar.gz bcm5719-llvm-5000ce8a632c701aba09ddfa6d4bc33ae1b6f5a5.zip | |
X86: Don't emit SAHF/LAHF for 64-bit targets unless explicitly supported
These instructions are not supported by all CPUs in 64-bit mode. Emitting them
causes Chromium to crash on start-up for users with such chips.
(GCC puts these instructions behind -msahf on 64-bit for the same reason.)
This patch adds FeatureLAHFSAHF, enables it by default for 32-bit targets
and modern CPUs, and changes X86InstrInfo::copyPhysReg back to the lowering
from before r244503 when the instructions are not available.
Differential Revision: http://reviews.llvm.org/D15240
llvm-svn: 254793
Diffstat (limited to 'lldb/packages/Python/lldbsuite')
0 files changed, 0 insertions, 0 deletions
