[bpf] add big- and host- endian support

Summary:
-march=bpf    -> host endian
-march=bpf_le -> little endian
-match=bpf_be -> big endian

Test Plan:
v1 was tested by IBM s390 guys and appears to be working there.
It bit rots too fast here.

Reviewers: chandlerc, tstellarAMD

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D10177

llvm-svn: 239071

1 files changed, 12 insertions, 2 deletions

diff --git a/llvm/lib/Target/BPF/TargetInfo/BPFTargetInfo.cpp b/llvm/lib/Target/BPF/TargetInfo/BPFTargetInfo.cpp
index 87716e6775c..406165bca1e 100644
--- a/llvm/lib/Target/BPF/TargetInfo/BPFTargetInfo.cpp
+++ b/llvm/lib/Target/BPF/TargetInfo/BPFTargetInfo.cpp
@@ -11,8 +11,18 @@
 #include "llvm/Support/TargetRegistry.h"
 using namespace llvm;
 
-Target llvm::TheBPFTarget;
+namespace llvm {
+Target TheBPFleTarget;
+Target TheBPFbeTarget;
+Target TheBPFTarget;
+}
 
 extern "C" void LLVMInitializeBPFTargetInfo() {
-  RegisterTarget<Triple::bpf, /*HasJIT=*/true> X(TheBPFTarget, "bpf", "BPF");
+  TargetRegistry::RegisterTarget(TheBPFTarget, "bpf",
+                                 "BPF (host endian)",
+                                 [](Triple::ArchType) { return false; }, true);
+  RegisterTarget<Triple::bpf_le, /*HasJIT=*/true> X(
+      TheBPFleTarget, "bpf_le", "BPF (little endian)");
+  RegisterTarget<Triple::bpf_be, /*HasJIT=*/true> Y(
+      TheBPFbeTarget, "bpf_be", "BPF (big endian)");
 }