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//===-- AArch64SMEAttributes.cpp - Helper for interpreting SME attributes -===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "AArch64SMEAttributes.h"
#include "llvm/IR/InstrTypes.h"
#include <cassert>
using namespace llvm;
void SMEAttrs::set(unsigned M, bool Enable) {
if (Enable)
Bitmask |= M;
else
Bitmask &= ~M;
assert(!(hasStreamingInterface() && hasStreamingCompatibleInterface()) &&
"SM_Enabled and SM_Compatible are mutually exclusive");
assert(!(hasNewZAInterface() && hasSharedZAInterface()) &&
"ZA_New and ZA_Shared are mutually exclusive");
assert(!(hasNewZAInterface() && preservesZA()) &&
"ZA_New and ZA_Preserved are mutually exclusive");
}
SMEAttrs::SMEAttrs(const CallBase &CB) {
*this = SMEAttrs(CB.getAttributes());
if (auto *F = CB.getCalledFunction())
set(SMEAttrs(*F).Bitmask);
}
SMEAttrs::SMEAttrs(const AttributeList &Attrs) {
Bitmask = 0;
if (Attrs.hasFnAttr("aarch64_pstate_sm_enabled"))
Bitmask |= SM_Enabled;
if (Attrs.hasFnAttr("aarch64_pstate_sm_compatible"))
Bitmask |= SM_Compatible;
if (Attrs.hasFnAttr("aarch64_pstate_sm_body"))
Bitmask |= SM_Body;
if (Attrs.hasFnAttr("aarch64_pstate_za_shared"))
Bitmask |= ZA_Shared;
if (Attrs.hasFnAttr("aarch64_pstate_za_new"))
Bitmask |= ZA_New;
if (Attrs.hasFnAttr("aarch64_pstate_za_preserved"))
Bitmask |= ZA_Preserved;
}
std::optional<bool>
SMEAttrs::requiresSMChange(const SMEAttrs &Callee,
bool BodyOverridesInterface) const {
// If the transition is not through a call (e.g. when considering inlining)
// and Callee has a streaming body, then we can ignore the interface of
// Callee.
if (BodyOverridesInterface && Callee.hasStreamingBody()) {
return hasStreamingInterfaceOrBody() ? std::nullopt
: std::optional<bool>(true);
}
if (Callee.hasStreamingCompatibleInterface())
return std::nullopt;
// Both non-streaming
if (hasNonStreamingInterfaceAndBody() && Callee.hasNonStreamingInterface())
return std::nullopt;
// Both streaming
if (hasStreamingInterfaceOrBody() && Callee.hasStreamingInterface())
return std::nullopt;
return Callee.hasStreamingInterface();
}
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