[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
diff --git a/llvm/lib/Target/PowerPC/PPC.td b/llvm/lib/Target/PowerPC/PPC.td
index 13d3f31..8f4c1ee 100644
--- a/llvm/lib/Target/PowerPC/PPC.td
+++ b/llvm/lib/Target/PowerPC/PPC.td
@@ -90,6 +90,9 @@
"Enable the ldbrx instruction">;
def FeatureBookE : SubtargetFeature<"booke", "IsBookE", "true",
"Enable Book E instructions">;
+def FeatureMSYNC : SubtargetFeature<"msync", "HasOnlyMSYNC", "true",
+ "Has only the msync instruction instead of sync",
+ [FeatureBookE]>;
def FeatureE500 : SubtargetFeature<"e500", "IsE500", "true",
"Enable E500/E500mc instructions">;
def FeaturePPC4xx : SubtargetFeature<"ppc4xx", "IsPPC4xx", "true",
@@ -196,10 +199,12 @@
def : Processor<"generic", G3Itineraries, [Directive32]>;
def : ProcessorModel<"440", PPC440Model, [Directive440, FeatureISEL,
FeatureFRES, FeatureFRSQRTE,
- FeatureBookE, DeprecatedMFTB]>;
+ FeatureBookE, FeatureMSYNC,
+ DeprecatedMFTB]>;
def : ProcessorModel<"450", PPC440Model, [Directive440, FeatureISEL,
FeatureFRES, FeatureFRSQRTE,
- FeatureBookE, DeprecatedMFTB]>;
+ FeatureBookE, FeatureMSYNC,
+ DeprecatedMFTB]>;
def : Processor<"601", G3Itineraries, [Directive601]>;
def : Processor<"602", G3Itineraries, [Directive602]>;
def : Processor<"603", G3Itineraries, [Directive603,