[x86] Additional small fix for MCU psABI support

This patch fixes one more thing in MCU psABI support: LongDoubleWidth should be set to 64.

Differential Revision: http://reviews.llvm.org/D14285

llvm-svn: 252156

2 files changed, 7 insertions, 3 deletions

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 70fa6b3f1bf..a88c614e1f4 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -2335,8 +2335,7 @@ class X86TargetInfo : public TargetInfo {
 public:
   X86TargetInfo(const llvm::Triple &Triple) : TargetInfo(Triple) {
     BigEndian = false;
-    LongDoubleFormat = Triple.isOSIAMCU() ? &llvm::APFloat::IEEEdouble
-                                          : &llvm::APFloat::x87DoubleExtended;
+    LongDoubleFormat = &llvm::APFloat::x87DoubleExtended;
   }
   unsigned getFloatEvalMethod() const override {
     // X87 evaluates with 80 bits "long double" precision.
@@ -3624,6 +3623,11 @@ public:
     IntPtrType = SignedInt;
     RegParmMax = 3;
 
+    if (getTriple().isOSIAMCU()) {
+      LongDoubleWidth = 64;
+      LongDoubleFormat = &llvm::APFloat::IEEEdouble;
+    }
+
     // Use fpret for all types.
     RealTypeUsesObjCFPRet = ((1 << TargetInfo::Float) |
                              (1 << TargetInfo::Double) |
diff --git a/clang/test/CodeGen/x86_32-arguments-iamcu.c b/clang/test/CodeGen/x86_32-arguments-iamcu.c
index bac2fb71a08..12fafdf4f53 100644
--- a/clang/test/CodeGen/x86_32-arguments-iamcu.c
+++ b/clang/test/CodeGen/x86_32-arguments-iamcu.c
@@ -57,6 +57,6 @@ st12_t retLargeStruct(int i1, st12_t r) { return r; }
 // CHECK-LABEL: define i32 @varArgs(i32 inreg %i1, ...)
 int varArgs(int i1, ...) { return i1; }
 
-// CHECK-LABEL: define double @longDoubleArg(double %ld1)
+// CHECK-LABEL: define double @longDoubleArg(double inreg %ld1)
 long double longDoubleArg(long double ld1) { return ld1; }