1264849299
This patch adds a pass 'enable-arm-streaming' that enables the Armv9 Scalable Matrix Extension (SME) Streaming SVE (SSVE) mode [1] by adding either of the following attributes to 'func.func' ops: * arm_streaming (default) * arm_locally_streaming PATCH [2 / 2] in series for RFC: https://discourse.llvm.org/t/rfc-supporting-armv9-scalable-matrix-extension-sme-streaming-sve-ssve-mode-in-mlir/70678 [1] https://developer.arm.com/documentation/ddi0616/aa Reviewed By: awarzynski, dcaballe Differential Revision: https://reviews.llvm.org/D150934
76 lines
2.7 KiB
C++
76 lines
2.7 KiB
C++
//===- EnableArmStreaming.cpp - Enable Armv9 Streaming SVE mode -----------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This pass enables the Armv9 Scalable Matrix Extension (SME) Streaming SVE
|
|
// (SSVE) mode [1][2] by adding either of the following attributes to
|
|
// 'func.func' ops:
|
|
//
|
|
// * 'arm_streaming' (default)
|
|
// * 'arm_locally_streaming'
|
|
//
|
|
// Streaming-mode is part of the interface (ABI) for functions with the
|
|
// first attribute and it's the responsibility of the caller to manage
|
|
// PSTATE.SM on entry/exit to functions with this attribute [3]. The LLVM
|
|
// backend will emit 'smstart sm' / 'smstop sm' [4] around calls to
|
|
// streaming functions.
|
|
//
|
|
// In locally streaming functions PSTATE.SM is kept internal and managed by
|
|
// the callee on entry/exit. The LLVM backend will emit 'smstart sm' /
|
|
// 'smstop sm' in the prologue / epilogue for functions with this
|
|
// attribute.
|
|
//
|
|
// [1] https://developer.arm.com/documentation/ddi0616/aa
|
|
// [2] https://llvm.org/docs/AArch64SME.html
|
|
// [3] https://github.com/ARM-software/abi-aa/blob/main/aapcs64/aapcs64.rst#671pstatesm-interfaces
|
|
// [4] https://developer.arm.com/documentation/ddi0602/2023-03/Base-Instructions/SMSTART--Enables-access-to-Streaming-SVE-mode-and-SME-architectural-state--an-alias-of-MSR--immediate--
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "mlir/Dialect/ArmSME/Transforms/Passes.h"
|
|
|
|
#include "mlir/Dialect/Func/IR/FuncOps.h"
|
|
|
|
#define DEBUG_TYPE "enable-arm-streaming"
|
|
|
|
namespace mlir {
|
|
namespace arm_sme {
|
|
#define GEN_PASS_DEF_ENABLEARMSTREAMING
|
|
#include "mlir/Dialect/ArmSME/Transforms/Passes.h.inc"
|
|
} // namespace arm_sme
|
|
} // namespace mlir
|
|
|
|
using namespace mlir;
|
|
using namespace mlir::arm_sme;
|
|
|
|
static constexpr char kArmStreamingAttr[] = "arm_streaming";
|
|
static constexpr char kArmLocallyStreamingAttr[] = "arm_locally_streaming";
|
|
|
|
namespace {
|
|
struct EnableArmStreamingPass
|
|
: public arm_sme::impl::EnableArmStreamingBase<EnableArmStreamingPass> {
|
|
EnableArmStreamingPass(ArmStreaming mode) { this->mode = mode; }
|
|
void runOnOperation() override {
|
|
std::string attr;
|
|
switch (mode) {
|
|
case ArmStreaming::Default:
|
|
attr = kArmStreamingAttr;
|
|
break;
|
|
case ArmStreaming::Locally:
|
|
attr = kArmLocallyStreamingAttr;
|
|
break;
|
|
}
|
|
getOperation()->setAttr(attr, UnitAttr::get(&getContext()));
|
|
}
|
|
};
|
|
} // namespace
|
|
|
|
std::unique_ptr<Pass>
|
|
mlir::arm_sme::createEnableArmStreamingPass(const ArmStreaming mode) {
|
|
return std::make_unique<EnableArmStreamingPass>(mode);
|
|
}
|