From: Ahsan Saghir <saghir.ibm@gmail.com>
Date: Mon, 29 Apr 2019 23:25:33 +0000 (+0000)
Subject: Add __builtin_dcbf support for PPC
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=cde6bbc766130822b7b296d84d9e03cbdd010b95;p=clang

Add __builtin_dcbf support for PPC

Summary:
This patch adds support for __builtin_dcbf for PPC.

__builtin_dcbf copies the contents of a modified block from the data cache
to main memory and flushes the copy from the data cache.

Differential revision: https://reviews.llvm.org/D59843

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@359517 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/docs/LanguageExtensions.rst b/docs/LanguageExtensions.rst
index 0299dde887..7772bf53e8 100644
--- a/docs/LanguageExtensions.rst
+++ b/docs/LanguageExtensions.rst
@@ -2448,6 +2448,31 @@ Note that the mode argument will modulo 4, so if the integer argument is greater
 than 3, it will only use the least significant two bits of the mode. 
 Namely, ``__builtin_setrnd(102))`` is equal to ``__builtin_setrnd(2)``.
 
+PowerPC cache builtins
+^^^^^^^^^^^^^^^^^^^^^^
+
+The PowerPC architecture specifies instructions implementing cache operations.
+Clang provides builtins that give direct programmer access to these cache
+instructions.
+
+Currently the following builtins are implemented in clang:
+
+``__builtin_dcbf`` copies the contents of a modified block from the data cache
+to main memory and flushes the copy from the data cache.
+
+**Syntax**:
+
+.. code-block:: c
+
+  void __dcbf(const void* addr); /* Data Cache Block Flush */
+
+**Example of Use**:
+
+.. code-block:: c
+
+  int a = 1;
+  __builtin_dcbf (&a);
+
 Extensions for Static Analysis
 ==============================
 
diff --git a/include/clang/Basic/BuiltinsPPC.def b/include/clang/Basic/BuiltinsPPC.def
index 9292458462..3b6348ad7d 100644
--- a/include/clang/Basic/BuiltinsPPC.def
+++ b/include/clang/Basic/BuiltinsPPC.def
@@ -478,6 +478,9 @@ BUILTIN(__builtin_pack_vector_int128, "V1LLLiULLiULLi", "")
 // Set the floating point rounding mode
 BUILTIN(__builtin_setrnd, "di", "")
 
+// Cache built-ins
+BUILTIN(__builtin_dcbf, "vvC*", "")
+
 // FIXME: Obviously incomplete.
 
 #undef BUILTIN
diff --git a/test/CodeGen/builtins-ppc-cache.c b/test/CodeGen/builtins-ppc-cache.c
new file mode 100644
index 0000000000..81c69e97bd
--- /dev/null
+++ b/test/CodeGen/builtins-ppc-cache.c
@@ -0,0 +1,47 @@
+// RUN: %clang_cc1 -triple powerpc64le-unknown-linux-gnu -emit-llvm \
+// RUN:   -o - %s | FileCheck %s
+
+int A;
+int B[5];
+float C;
+float D[5];
+double E;
+double F[5];
+
+void func(int a, int b[], float c, float d[], double e, double f[]) {
+  __builtin_dcbf (&a);
+  // CHECK: @llvm.ppc.dcbf(i8*
+
+  __builtin_dcbf (&A);
+  // CHECK: @llvm.ppc.dcbf(i8*
+
+  __builtin_dcbf (&b[2]);
+  // CHECK: @llvm.ppc.dcbf(i8*
+
+  __builtin_dcbf (&B[2]);
+  // CHECK: @llvm.ppc.dcbf(i8*
+
+  __builtin_dcbf (&c);
+  // CHECK: @llvm.ppc.dcbf(i8*
+
+  __builtin_dcbf (&C);
+  // CHECK: @llvm.ppc.dcbf(i8*
+
+  __builtin_dcbf (&d[2]);
+  // CHECK: @llvm.ppc.dcbf(i8*
+
+  __builtin_dcbf (&D[2]);
+  // CHECK: @llvm.ppc.dcbf(i8*
+
+  __builtin_dcbf (&e);
+  // CHECK: @llvm.ppc.dcbf(i8*
+
+  __builtin_dcbf (&E);
+  // CHECK: @llvm.ppc.dcbf(i8*
+
+  __builtin_dcbf (&f[0]);
+  // CHECK: @llvm.ppc.dcbf(i8*
+
+  __builtin_dcbf (&F[0]);
+  // CHECK: @llvm.ppc.dcbf(i8*
+}