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Add support for __builtin___clear_cache in Clang 

Adding the mapping between __builtin___clear_cache into @llvm.clear_cache

llvm-svn: 204820
This commit is contained in:
Renato Golin 2014-03-26 15:36:05 +00:00
parent 94321ec003
commit c491a8d457
3 changed files with 19 additions and 0 deletions
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1
clang/include/clang/Basic/Builtins.def
View File

@ -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")

6
clang/lib/CodeGen/CGBuiltin.cpp
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@ -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));

12
clang/test/CodeGen/clear_cache.c Normal file
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@ -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;
}