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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

llvm-svn: 359517
This commit is contained in:
Ahsan Saghir 2019-04-29 23:25:33 +00:00
parent efba22cb6c
commit 3962d6da17
5 changed files with 92 additions and 1 deletions
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25
clang/docs/LanguageExtensions.rst
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@ -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
==============================

3
clang/include/clang/Basic/BuiltinsPPC.def
View File

@ -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

47
clang/test/CodeGen/builtins-ppc-cache.c Normal file
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@ -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*
}

3
llvm/include/llvm/IR/IntrinsicsPowerPC.td
View File

@ -18,7 +18,8 @@
let TargetPrefix = "ppc" in { // All intrinsics start with "llvm.ppc.".
// dcba/dcbf/dcbi/dcbst/dcbt/dcbz/dcbzl(PPC970) instructions.
def int_ppc_dcba : Intrinsic<[], [llvm_ptr_ty], []>;
def int_ppc_dcbf : Intrinsic<[], [llvm_ptr_ty], []>;
def int_ppc_dcbf : GCCBuiltin<"__builtin_dcbf">,
Intrinsic<[], [llvm_ptr_ty], []>;
def int_ppc_dcbi : Intrinsic<[], [llvm_ptr_ty], []>;
def int_ppc_dcbst : Intrinsic<[], [llvm_ptr_ty], []>;
def int_ppc_dcbt : Intrinsic<[], [llvm_ptr_ty],

15
llvm/test/CodeGen/PowerPC/dcbf.ll Normal file
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@ -0,0 +1,15 @@
; RUN: llc -mtriple=powerpc64le-unknown-linux-gnu < %s \
; RUN: -verify-machineinstrs -ppc-asm-full-reg-names \
; RUN: -ppc-vsr-nums-as-vr | FileCheck %s
; Function Attrs: nounwind
define void @dcbf_test(i8* %a) {
entry:
tail call void @llvm.ppc.dcbf(i8* %a)
; CHECK-LABEL: @dcbf_test
; CHECK: dcbf 0, r3
; CHECK-NEXT: blr
ret void
}
declare void @llvm.ppc.dcbf(i8*)