[PowerPC] Fix issue with inline asm - soft float mode

This patch prevents floating point register
constraints in soft float mode.

Differential Revision: https://reviews.llvm.org/D59310

llvm-svn: 357466

2 files changed, 12 insertions, 1 deletions

diff --git a/clang/lib/Basic/Targets/PPC.cpp b/clang/lib/Basic/Targets/PPC.cpp
index 14a9ffd09a6..b052ef433ec 100644
--- a/clang/lib/Basic/Targets/PPC.cpp
+++ b/clang/lib/Basic/Targets/PPC.cpp
@@ -30,6 +30,7 @@ const Builtin::Info PPCTargetInfo::BuiltinInfo[] = {
 /// configured set of features.
 bool PPCTargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
                                          DiagnosticsEngine &Diags) {
+  FloatABI = HardFloat;
   for (const auto &Feature : Features) {
     if (Feature == "+altivec") {
       HasAltivec = true;
@@ -53,6 +54,8 @@ bool PPCTargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
       HasFloat128 = true;
     } else if (Feature == "+power9-vector") {
       HasP9Vector = true;
+    } else if (Feature == "-hard-float") {
+      FloatABI = SoftFloat;
     }
     // TODO: Finish this list and add an assert that we've handled them
     // all.
diff --git a/clang/lib/Basic/Targets/PPC.h b/clang/lib/Basic/Targets/PPC.h
index ace7eb35e76..7049020a911 100644
--- a/clang/lib/Basic/Targets/PPC.h
+++ b/clang/lib/Basic/Targets/PPC.h
@@ -53,6 +53,7 @@ class LLVM_LIBRARY_VISIBILITY PPCTargetInfo : public TargetInfo {
   static const char *const GCCRegNames[];
   static const TargetInfo::GCCRegAlias GCCRegAliases[];
   std::string CPU;
+  enum PPCFloatABI { HardFloat, SoftFloat } FloatABI;
 
   // Target cpu features.
   bool HasAltivec = false;
@@ -183,8 +184,11 @@ public:
       return false;
     case 'O': // Zero
       break;
-    case 'b': // Base register
     case 'f': // Floating point register
+      // Don't use floating point registers on soft float ABI.
+      if (FloatABI == SoftFloat)
+        return false;
+    case 'b': // Base register
       Info.setAllowsRegister();
       break;
     // FIXME: The following are added to allow parsing.
@@ -192,6 +196,10 @@ public:
     // Also, is more specific checking needed?  I.e. specific registers?
     case 'd': // Floating point register (containing 64-bit value)
     case 'v': // Altivec vector register
+      // Don't use floating point and altivec vector registers
+      // on soft float ABI
+      if (FloatABI == SoftFloat)
+        return false;
       Info.setAllowsRegister();
       break;
     case 'w':