r211059 - ARM: Support for __builtin_arm_rbit() intrinsic.

[Jim Grosbach]

Author: grosbach
Date: Mon Jun 16 16:55:58 2014
New Revision: 211059

URL: http://llvm.org/viewvc/llvm-project?rev=211059&view=rev
Log:
ARM: Support for __builtin_arm_rbit() intrinsic.

Reverse the bits in a word. Maps to the RBIT instruction.

rdar://9283021

Modified:
    cfe/trunk/include/clang/Basic/BuiltinsARM.def
    cfe/trunk/lib/CodeGen/CGBuiltin.cpp
    cfe/trunk/test/CodeGen/builtins-arm.c

Modified: cfe/trunk/include/clang/Basic/BuiltinsARM.def
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/BuiltinsARM.def?rev=211059&r1=211058&r2=211059&view=diff
==============================================================================
--- cfe/trunk/include/clang/Basic/BuiltinsARM.def (original)
+++ cfe/trunk/include/clang/Basic/BuiltinsARM.def Mon Jun 16 16:55:58 2014
@@ -24,6 +24,9 @@ BUILTIN(__builtin_arm_qsub, "iii", "nc")
 BUILTIN(__builtin_arm_ssat, "iiUi", "nc")
 BUILTIN(__builtin_arm_usat, "UiUiUi", "nc")
 
+// Bit manipulation
+BUILTIN(__builtin_arm_rbit, "UiUi", "nc")
+
 // Store and load exclusive
 BUILTIN(__builtin_arm_ldrexd, "LLUiv*", "")
 BUILTIN(__builtin_arm_strexd, "iLLUiv*", "")

Modified: cfe/trunk/lib/CodeGen/CGBuiltin.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGBuiltin.cpp?rev=211059&r1=211058&r2=211059&view=diff
==============================================================================
--- cfe/trunk/lib/CodeGen/CGBuiltin.cpp (original)
+++ cfe/trunk/lib/CodeGen/CGBuiltin.cpp Mon Jun 16 16:55:58 2014
@@ -3054,6 +3054,12 @@ Value *CodeGenFunction::EmitARMBuiltinEx
     return Builder.CreateCall(F, llvm::ConstantInt::get(Int32Ty, HintID));
   }
 
+  if (BuiltinID == ARM::BI__builtin_arm_rbit) {
+    return Builder.CreateCall(CGM.getIntrinsic(Intrinsic::arm_rbit),
+                                               EmitScalarExpr(E->getArg(0)),
+                              "rbit");
+  }
+
   if (BuiltinID == ARM::BI__clear_cache) {
     assert(E->getNumArgs() == 2 && "__clear_cache takes 2 arguments");
     const FunctionDecl *FD = E->getDirectCallee();

Modified: cfe/trunk/test/CodeGen/builtins-arm.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/builtins-arm.c?rev=211059&r1=211058&r2=211059&view=diff
==============================================================================
--- cfe/trunk/test/CodeGen/builtins-arm.c (original)
+++ cfe/trunk/test/CodeGen/builtins-arm.c Mon Jun 16 16:55:58 2014
@@ -52,3 +52,9 @@ void test_barrier() {
   __builtin_arm_dmb(1); //CHECK: call {{.*}} @llvm.arm.dmb(i32 1)
   __builtin_arm_dsb(2); //CHECK: call {{.*}} @llvm.arm.dsb(i32 2)
 }
+
+// CHECK: call {{.*}} @llvm.arm.rbit(i32 %a)
+
+unsigned rbit(unsigned a) {
+  return __builtin_arm_rbit(a);
+}