Handle multi-value inputs

llvm-svn: 62069

clang/lib/CodeGen/CGStmt.cpp

@@ -19,6 +19,7 @@
 #include "llvm/ADT/StringExtras.h"
 #include "llvm/InlineAsm.h"
 #include "llvm/Intrinsics.h"
+#include "llvm/Target/TargetData.h"
 using namespace clang;
 using namespace CodeGen;
 
@@ -868,11 +869,23 @@ llvm::Value* CodeGenFunction::EmitAsmInput(const AsmStmt &S,
   llvm::Value *Arg;
   if ((Info & TargetInfo::CI_AllowsRegister) ||
       !(Info & TargetInfo::CI_AllowsMemory)) { 
-    if (ConvertType(InputExpr->getType())->isSingleValueType()) {
+    const llvm::Type *Ty = ConvertType(InputExpr->getType());
+    
+    if (Ty->isSingleValueType()) {
       Arg = EmitScalarExpr(InputExpr);
     } else {
-      ErrorUnsupported(&S,
-                       "asm statement passing multiple-value types as inputs");
+      LValue Dest = EmitLValue(InputExpr);
+
+      uint64_t Size = CGM.getTargetData().getTypeSizeInBits(Ty);
+      if (Size <= 64 && llvm::isPowerOf2_64(Size)) {
+        Ty = llvm::IntegerType::get(Size);
+        Ty = llvm::PointerType::getUnqual(Ty);
+        
+        Arg = Builder.CreateLoad(Builder.CreateBitCast(Dest.getAddress(), Ty));
+      } else {
+        Arg = Dest.getAddress();
+        ConstraintStr += '*';
+      }
     }
   } else {
     LValue Dest = EmitLValue(InputExpr);

clang/test/CodeGen/asm.c

@@ -14,6 +14,13 @@ void t3(unsigned char *src, unsigned long long temp)
   __asm__ volatile("" : "+m"(temp), "+r"(src));
 }
 
+void t4()
+{
+  unsigned long long a;
+  struct reg { unsigned long long a, b; } b;
+
+	__asm__ volatile ("":: "m"(a), "m"(b));
+}