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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;
// Streaming Mode Attrs
assert(!(hasStreamingInterface() && hasStreamingCompatibleInterface()) &&
"SM_Enabled and SM_Compatible are mutually exclusive");
// ZA Attrs
assert(!(hasNewZABody() && sharesZA()) &&
"ZA_New and ZA_Shared are mutually exclusive");
assert(!(hasNewZABody() && preservesZA()) &&
"ZA_New and ZA_Preserved are mutually exclusive");
assert(!(hasNewZABody() && (Bitmask & SME_ABI_Routine)) &&
"ZA_New and SME_ABI_Routine are mutually exclusive");
// ZT0 Attrs
assert(
(!sharesZT0() || (isNewZT0() ^ isInZT0() ^ isInOutZT0() ^ isOutZT0() ^
isPreservesZT0())) &&
"Attributes 'aarch64_new_zt0', 'aarch64_in_zt0', 'aarch64_out_zt0', "
"'aarch64_inout_zt0' and 'aarch64_preserves_zt0' are mutually exclusive");
}
SMEAttrs::SMEAttrs(const CallBase &CB) {
*this = SMEAttrs(CB.getAttributes());
if (auto *F = CB.getCalledFunction()) {
set(SMEAttrs(*F).Bitmask | SMEAttrs(F->getName()).Bitmask);
}
}
SMEAttrs::SMEAttrs(StringRef FuncName) : Bitmask(0) {
if (FuncName == "__arm_tpidr2_save" || FuncName == "__arm_sme_state")
Bitmask |= (SMEAttrs::SM_Compatible | SMEAttrs::SME_ABI_Routine);
if (FuncName == "__arm_tpidr2_restore")
Bitmask |= (SMEAttrs::SM_Compatible | SMEAttrs::ZA_Shared |
SMEAttrs::SME_ABI_Routine);
}
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;
if (Attrs.hasFnAttr("aarch64_in_zt0"))
Bitmask |= encodeZT0State(StateValue::In);
if (Attrs.hasFnAttr("aarch64_out_zt0"))
Bitmask |= encodeZT0State(StateValue::Out);
if (Attrs.hasFnAttr("aarch64_inout_zt0"))
Bitmask |= encodeZT0State(StateValue::InOut);
if (Attrs.hasFnAttr("aarch64_preserves_zt0"))
Bitmask |= encodeZT0State(StateValue::Preserved);
if (Attrs.hasFnAttr("aarch64_new_zt0"))
Bitmask |= encodeZT0State(StateValue::New);
}
bool SMEAttrs::requiresSMChange(const SMEAttrs &Callee) const {
if (Callee.hasStreamingCompatibleInterface())
return false;
// Both non-streaming
if (hasNonStreamingInterfaceAndBody() && Callee.hasNonStreamingInterface())
return false;
// Both streaming
if (hasStreamingInterfaceOrBody() && Callee.hasStreamingInterface())
return false;
return true;
}
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