From: Renato Golin <renato.golin@linaro.org>
Date: Wed, 26 Mar 2014 15:36:05 +0000 (+0000)
Subject: Add support for __builtin___clear_cache in Clang
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=51da10e76e2a903f0f6813678fe99892ee60550d;p=clang

Add support for __builtin___clear_cache in Clang

Adding the mapping between __builtin___clear_cache into @llvm.clear_cache

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@204820 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/clang/Basic/Builtins.def b/include/clang/Basic/Builtins.def
index a44a7a2d21..53bec2ab83 100644
--- a/include/clang/Basic/Builtins.def
+++ b/include/clang/Basic/Builtins.def
@@ -445,6 +445,7 @@ BUILTIN(__builtin_strstr, "c*cC*cC*", "nF")
 BUILTIN(__builtin_return_address, "v*IUi", "n")
 BUILTIN(__builtin_extract_return_addr, "v*v*", "n")
 BUILTIN(__builtin_frame_address, "v*IUi", "n")
+BUILTIN(__builtin___clear_cache, "vc*c*", "n")
 BUILTIN(__builtin_flt_rounds, "i", "nc")
 BUILTIN(__builtin_setjmp, "iv**", "j")
 BUILTIN(__builtin_longjmp, "vv**i", "r")
diff --git a/lib/CodeGen/CGBuiltin.cpp b/lib/CodeGen/CGBuiltin.cpp
index fc93b7719f..c105d80bf7 100644
--- a/lib/CodeGen/CGBuiltin.cpp
+++ b/lib/CodeGen/CGBuiltin.cpp
@@ -429,6 +429,12 @@ RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD,
     Value *F = CGM.getIntrinsic(Intrinsic::readcyclecounter);
     return RValue::get(Builder.CreateCall(F));
   }
+  case Builtin::BI__builtin___clear_cache: {
+    Value *Begin = EmitScalarExpr(E->getArg(0));
+    Value *End = EmitScalarExpr(E->getArg(1));
+    Value *F = CGM.getIntrinsic(Intrinsic::clear_cache);
+    return RValue::get(Builder.CreateCall2(F, Begin, End));
+  }
   case Builtin::BI__builtin_trap: {
     Value *F = CGM.getIntrinsic(Intrinsic::trap);
     return RValue::get(Builder.CreateCall(F));
diff --git a/test/CodeGen/clear_cache.c b/test/CodeGen/clear_cache.c
new file mode 100644
index 0000000000..f859d7fdc9
--- /dev/null
+++ b/test/CodeGen/clear_cache.c
@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 -emit-llvm %s -o - | FileCheck %s
+
+char buffer[32] = "This is a largely unused buffer";
+
+// __builtin___clear_cache always maps to @llvm.clear_cache, but what
+// each back-end produces is different, and this is tested in LLVM
+
+int main() {
+  __builtin___clear_cache(buffer, buffer+32);
+// CHECK: @llvm.clear_cache(i8* getelementptr {{.*}}, i8* getelementptr {{.*}} (i8* getelementptr {{.*}} 32))
+  return 0;
+}