[X86] Remove the SlowBTMem feature flag entirely
authorCraig Topper <craig.topper@intel.com>
Sun, 15 Oct 2017 16:57:33 +0000 (16:57 +0000)
committerCraig Topper <craig.topper@intel.com>
Sun, 15 Oct 2017 16:57:33 +0000 (16:57 +0000)
commit27381173268b6d5d226ddd3429f57f10b20c58c0
tree4e8eb5f4bc79fec5a10298a30ec5f0d0f73061fd
parentc2e2e0a678e41ce4670f8248b9faefe1cdf54b07
[X86] Remove the SlowBTMem feature flag entirely

Turns out we have no patterns on the instructions that were using this feature flag for other reasons. These instructions are slow on all modern CPUs so it seems unlikely that we will spend any effort supporting these instructions going forward. So we might as well just kill of the feature flag and just fix up the comments.

llvm-svn: 315862
llvm/lib/Target/X86/X86.td
llvm/lib/Target/X86/X86InstrInfo.td
llvm/lib/Target/X86/X86Subtarget.cpp
llvm/lib/Target/X86/X86Subtarget.h