[PowerPC] Modern Book-E cores support sync

Older Book-E cores, such as the PPC 440, support only msync (which has the same
encoding as sync 0), but not any of the other sync forms. Newer Book-E cores,
however, do support sync, and for performance reasons we should allow the use
of the more-general form.

This refactors msync use into its own feature group so that it applies by
default only to older Book-E cores (of the relevant cores, we only have
definitions for the PPC440/450 currently).

llvm-svn: 218923

1 files changed, 1 insertions, 0 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCSubtarget.cpp b/llvm/lib/Target/PowerPC/PPCSubtarget.cpp
index da4a57015c6..ba8bda9ec2c 100644
--- a/llvm/lib/Target/PowerPC/PPCSubtarget.cpp
+++ b/llvm/lib/Target/PowerPC/PPCSubtarget.cpp
@@ -109,6 +109,7 @@ void PPCSubtarget::initializeEnvironment() {
   HasPOPCNTD = false;
   HasLDBRX = false;
   IsBookE = false;
+  HasOnlyMSYNC = false;
   IsPPC4xx = false;
   IsPPC6xx = false;
   IsE500 = false;