[PowerPC] Support powerpc64le as a syntax-checking target.

This patch provides basic support for powerpc64le as an LLVM target.
However, use of this target will not actually generate little-endian
code.  Instead, use of the target will cause the correct little-endian
built-in defines to be generated, so that code that tests for
__LITTLE_ENDIAN__, for example, will be correctly parsed for
syntax-only testing.  Code generation will otherwise be the same as
powerpc64 (big-endian), for now.

The patch leaves open the possibility of creating a little-endian
PowerPC64 back end, but there is no immediate intent to create such a
thing.

The LLVM portions of this patch simply add ppc64le coverage everywhere
that ppc64 coverage currently exists.  There is nothing of any import
worth testing until such time as little-endian code generation is
implemented.  In the corresponding Clang patch, there is a new test
case variant to ensure that correct built-in defines for little-endian
code are generated.

llvm-svn: 187179

1 files changed, 3 insertions, 1 deletions

diff --git a/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp b/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp
index d75cb9552d4..7d66cc68299 100644
--- a/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp
+++ b/llvm/lib/Target/PowerPC/AsmParser/PPCAsmParser.cpp
@@ -222,7 +222,8 @@ public:
     : MCTargetAsmParser(), STI(_STI), Parser(_Parser) {
     // Check for 64-bit vs. 32-bit pointer mode.
     Triple TheTriple(STI.getTargetTriple());
-    IsPPC64 = TheTriple.getArch() == Triple::ppc64;
+    IsPPC64 = (TheTriple.getArch() == Triple::ppc64 ||
+               TheTriple.getArch() == Triple::ppc64le);
     // Initialize the set of available features.
     setAvailableFeatures(ComputeAvailableFeatures(STI.getFeatureBits()));
   }
@@ -1313,6 +1314,7 @@ bool PPCAsmParser::ParseDirectiveMachine(SMLoc L) {
 extern "C" void LLVMInitializePowerPCAsmParser() {
   RegisterMCAsmParser<PPCAsmParser> A(ThePPC32Target);
   RegisterMCAsmParser<PPCAsmParser> B(ThePPC64Target);
+  RegisterMCAsmParser<PPCAsmParser> C(ThePPC64LETarget);
 }
 
 #define GET_REGISTER_MATCHER