Add SystemZ support

This patch then adds all the usual platform-specific pieces for SystemZ:
driver support, basic target info, register names and constraints,
ABI info and vararg support.  It also adds new tests to verify pre-defined
macros and inline asm, and updates a test for the minimum alignment change.

This version of the patch incorporates feedback from reviews by
Eric Christopher and John McCall.  Thanks to all reviewers!

Patch by Richard Sandiford.

llvm-svn: 181211

1 files changed, 17 insertions, 1 deletions

diff --git a/clang/lib/Driver/ToolChains.cpp b/clang/lib/Driver/ToolChains.cpp
index 1ca2a34bfed..fffba0e4e50 100644
--- a/clang/lib/Driver/ToolChains.cpp
+++ b/clang/lib/Driver/ToolChains.cpp
@@ -1146,6 +1146,15 @@ Generic_GCC::GCCInstallationDetector::GCCInstallationDetector(
     "ppc64-redhat-linux"
   };
 
+  static const char *const SystemZLibDirs[] = { "/lib64", "/lib" };
+  static const char *const SystemZTriples[] = {
+    "s390x-linux-gnu",
+    "s390x-unknown-linux-gnu",
+    "s390x-ibm-linux-gnu",
+    "s390x-suse-linux",
+    "s390x-redhat-linux"
+  };
+
   switch (TargetTriple.getArch()) {
   case llvm::Triple::aarch64:
     LibDirs.append(AArch64LibDirs, AArch64LibDirs
@@ -1246,6 +1255,12 @@ Generic_GCC::GCCInstallationDetector::GCCInstallationDetector(
     MultiarchTripleAliases.append(
       PPCTriples, PPCTriples + llvm::array_lengthof(PPCTriples));
     break;
+  case llvm::Triple::systemz:
+    LibDirs.append(
+      SystemZLibDirs, SystemZLibDirs + llvm::array_lengthof(SystemZLibDirs));
+    TripleAliases.append(
+      SystemZTriples, SystemZTriples + llvm::array_lengthof(SystemZTriples));
+    break;
 
   default:
     // By default, just rely on the standard lib directories and the original
@@ -1349,7 +1364,8 @@ static bool findTargetMultiarchSuffix(std::string &Suffix,
   }
 
   if (TargetArch == llvm::Triple::x86_64 ||
-      TargetArch == llvm::Triple::ppc64)
+      TargetArch == llvm::Triple::ppc64 ||
+      TargetArch == llvm::Triple::systemz)
     Suffix = "/64";
   else
     Suffix = "/32";