r233542 - [mips] Add support for 'ZC' inline assembly memory constraint.

[Daniel Sanders]

Author: dsanders
Date: Mon Mar 30 08:47:23 2015
New Revision: 233542

URL: http://llvm.org/viewvc/llvm-project?rev=233542&view=rev
Log:
[mips] Add support for 'ZC' inline assembly memory constraint.

Summary: Also add tests for 'R' and 'm'.

Reviewers: atanasyan

Reviewed By: atanasyan

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D8449

Added:
    cfe/trunk/test/CodeGen/mips-inline-asm.c
Modified:
    cfe/trunk/lib/Basic/Targets.cpp

Modified: cfe/trunk/lib/Basic/Targets.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Basic/Targets.cpp?rev=233542&r1=233541&r2=233542&view=diff
==============================================================================
--- cfe/trunk/lib/Basic/Targets.cpp (original)
+++ cfe/trunk/lib/Basic/Targets.cpp Mon Mar 30 08:47:23 2015
@@ -5857,9 +5857,30 @@ public:
     case 'R': // An address that can be used in a non-macro load or store
       Info.setAllowsMemory();
       return true;
+    case 'Z':
+      if (Name[1] == 'C') { // An address usable by ll, and sc.
+        Info.setAllowsMemory();
+        Name++; // Skip over 'Z'.
+        return true;
+      }
+      return false;
     }
   }
 
+  std::string convertConstraint(const char *&Constraint) const override {
+    std::string R;
+    switch (*Constraint) {
+    case 'Z': // Two-character constraint; add "^" hint for later parsing.
+      if (Constraint[1] == 'C') {
+        R = std::string("^") + std::string(Constraint, 2);
+        Constraint++;
+        return R;
+      }
+      break;
+    }
+    return TargetInfo::convertConstraint(Constraint);
+  }
+
   const char *getClobbers() const override {
     // In GCC, $1 is not widely used in generated code (it's used only in a few
     // specific situations), so there is no real need for users to add it to

Added: cfe/trunk/test/CodeGen/mips-inline-asm.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/mips-inline-asm.c?rev=233542&view=auto
==============================================================================
--- cfe/trunk/test/CodeGen/mips-inline-asm.c (added)
+++ cfe/trunk/test/CodeGen/mips-inline-asm.c Mon Mar 30 08:47:23 2015
@@ -0,0 +1,19 @@
+// REQUIRES: mips-registered-target
+// RUN: %clang_cc1 -triple mips-linux-gnu -emit-llvm -o - %s | FileCheck %s
+
+int data;
+
+void m () {
+  asm("lw $1, %0" :: "m"(data));
+  // CHECK: call void asm sideeffect "lw $$1, $0", "*m,~{$1}"(i32* @data)
+}
+
+void ZC () {
+  asm("ll $1, %0" :: "ZC"(data));
+  // CHECK: call void asm sideeffect "ll $$1, $0", "*^ZC,~{$1}"(i32* @data)
+}
+
+void R () {
+  asm("lw $1, %0" :: "R"(data));
+  // CHECK: call void asm sideeffect "lw $$1, $0", "*R,~{$1}"(i32* @data)
+}