From: Chad Rosier <mcrosier@apple.com>
Date: Wed, 15 Aug 2012 18:12:36 +0000 (+0000)
Subject: [ms-inline asm]  Add support for clobbers in CodeGen.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=5aad79f8d54bf4356b2c8b9e56ace9ac8c39adb0;p=clang

[ms-inline asm]  Add support for clobbers in CodeGen.

This is a reapplication of r161914 now that the scoping issue has been resolved
in r161966.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@161967 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/CGStmt.cpp b/lib/CodeGen/CGStmt.cpp
index 467c77945e..d78908dee8 100644
--- a/lib/CodeGen/CGStmt.cpp
+++ b/lib/CodeGen/CGStmt.cpp
@@ -1691,14 +1691,36 @@ void CodeGenFunction::EmitMSAsmStmt(const MSAsmStmt &S) {
 
   std::vector<llvm::Value*> Args;
   std::vector<llvm::Type *> ArgTypes;
+  std::string Constraints;
+
+  // Clobbers
+  for (unsigned i = 0, e = S.getNumClobbers(); i != e; ++i) {
+    StringRef Clobber = S.getClobber(i);
+
+    if (Clobber != "memory" && Clobber != "cc")
+      Clobber = Target.getNormalizedGCCRegisterName(Clobber);
+
+    if (i != 0)
+      Constraints += ',';
+
+    Constraints += "~{";
+    Constraints += Clobber;
+    Constraints += '}';
+  }
 
+  // Add machine specific clobbers
   std::string MachineClobbers = Target.getClobbers();
+  if (!MachineClobbers.empty()) {
+    if (!Constraints.empty())
+      Constraints += ',';
+    Constraints += MachineClobbers;
+  }
 
   llvm::FunctionType *FTy =
     llvm::FunctionType::get(VoidTy, ArgTypes, false);
 
   llvm::InlineAsm *IA =
-    llvm::InlineAsm::get(FTy, *S.getAsmString(), MachineClobbers, true);
+    llvm::InlineAsm::get(FTy, *S.getAsmString(), Constraints, true);
   llvm::CallInst *Result = Builder.CreateCall(IA, Args);
   Result->addAttribute(~0, llvm::Attribute::NoUnwind);
   Result->addAttribute(~0, llvm::Attribute::IANSDialect);
diff --git a/test/CodeGen/ms-inline-asm.c b/test/CodeGen/ms-inline-asm.c
index c08e53b64e..fe0d3a5826 100644
--- a/test/CodeGen/ms-inline-asm.c
+++ b/test/CodeGen/ms-inline-asm.c
@@ -29,8 +29,8 @@ void t3() {
 
 void t4(void) {
 // CHECK: @t4
-// CHECK: call void asm sideeffect "mov ebx, eax", "~{dirflag},~{fpsr},~{flags}"() nounwind ia_nsdialect
-// CHECK: call void asm sideeffect "mov ecx, ebx", "~{dirflag},~{fpsr},~{flags}"() nounwind ia_nsdialect
+// CHECK: call void asm sideeffect "mov ebx, eax", "~{ebx},~{dirflag},~{fpsr},~{flags}"() nounwind ia_nsdialect
+// CHECK: call void asm sideeffect "mov ecx, ebx", "~{ecx},~{dirflag},~{fpsr},~{flags}"() nounwind ia_nsdialect
 // CHECK: ret void
   __asm mov ebx, eax
   __asm mov ecx, ebx
@@ -38,8 +38,8 @@ void t4(void) {
 
 void t5(void) {
 // CHECK: @t5
-// CHECK: call void asm sideeffect "mov ebx, eax", "~{dirflag},~{fpsr},~{flags}"() nounwind ia_nsdialect
-// CHECK: call void asm sideeffect "mov ecx, ebx", "~{dirflag},~{fpsr},~{flags}"() nounwind ia_nsdialect
+// CHECK: call void asm sideeffect "mov ebx, eax", "~{ebx},~{dirflag},~{fpsr},~{flags}"() nounwind ia_nsdialect
+// CHECK: call void asm sideeffect "mov ecx, ebx", "~{ecx},~{dirflag},~{fpsr},~{flags}"() nounwind ia_nsdialect
 // CHECK: ret void
   __asm mov ebx, eax __asm mov ecx, ebx
 }
@@ -83,5 +83,5 @@ void t10() {
     pop ebx
   }
 // CHECK: t10
-// CHECK: call void asm sideeffect "push ebx\0Amov ebx, 0x07\0Apop ebx", "~{dirflag},~{fpsr},~{flags}"() nounwind ia_nsdialect
+// CHECK: call void asm sideeffect "push ebx\0Amov ebx, 0x07\0Apop ebx", "~{ebx},~{ebx},~{dirflag},~{fpsr},~{flags}"() nounwind ia_nsdialect
 }