d297399b35
This change makes callees with the __arm_preserves_za
type attribute comply with the dormant state requirements
when it's caller has the __arm_shared_za type attribute.
Several external SME functions also do not need to lazy
save.
5e67092434/aapcs64/aapcs64.rst (L1381)
Differential Revision: https://reviews.llvm.org/D159186
89 lines
3.1 KiB
C++
89 lines
3.1 KiB
C++
//===-- AArch64SMEAttributes.cpp - Helper for interpreting SME attributes -===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "AArch64SMEAttributes.h"
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#include "llvm/IR/InstrTypes.h"
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#include <cassert>
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using namespace llvm;
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void SMEAttrs::set(unsigned M, bool Enable) {
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if (Enable)
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Bitmask |= M;
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else
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Bitmask &= ~M;
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assert(!(hasStreamingInterface() && hasStreamingCompatibleInterface()) &&
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"SM_Enabled and SM_Compatible are mutually exclusive");
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assert(!(hasNewZABody() && hasSharedZAInterface()) &&
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"ZA_New and ZA_Shared are mutually exclusive");
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assert(!(hasNewZABody() && preservesZA()) &&
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"ZA_New and ZA_Preserved are mutually exclusive");
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assert(!(hasNewZABody() && (Bitmask & ZA_NoLazySave)) &&
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"ZA_New and ZA_NoLazySave are mutually exclusive");
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assert(!(hasSharedZAInterface() && (Bitmask & ZA_NoLazySave)) &&
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"ZA_Shared and ZA_NoLazySave are mutually exclusive");
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}
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SMEAttrs::SMEAttrs(const CallBase &CB) {
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*this = SMEAttrs(CB.getAttributes());
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if (auto *F = CB.getCalledFunction()) {
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set(SMEAttrs(*F).Bitmask | SMEAttrs(F->getName()).Bitmask);
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}
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}
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SMEAttrs::SMEAttrs(StringRef FuncName) : Bitmask(0) {
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if (FuncName == "__arm_tpidr2_save" || FuncName == "__arm_sme_state")
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Bitmask |= (SMEAttrs::SM_Compatible | SMEAttrs::ZA_Preserved |
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SMEAttrs::ZA_NoLazySave);
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if (FuncName == "__arm_tpidr2_restore")
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Bitmask |= (SMEAttrs::SM_Compatible | SMEAttrs::ZA_Shared |
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SMEAttrs::ZA_NoLazySave);
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}
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SMEAttrs::SMEAttrs(const AttributeList &Attrs) {
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Bitmask = 0;
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if (Attrs.hasFnAttr("aarch64_pstate_sm_enabled"))
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Bitmask |= SM_Enabled;
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if (Attrs.hasFnAttr("aarch64_pstate_sm_compatible"))
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Bitmask |= SM_Compatible;
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if (Attrs.hasFnAttr("aarch64_pstate_sm_body"))
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Bitmask |= SM_Body;
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if (Attrs.hasFnAttr("aarch64_pstate_za_shared"))
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Bitmask |= ZA_Shared;
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if (Attrs.hasFnAttr("aarch64_pstate_za_new"))
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Bitmask |= ZA_New;
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if (Attrs.hasFnAttr("aarch64_pstate_za_preserved"))
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Bitmask |= ZA_Preserved;
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}
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std::optional<bool>
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SMEAttrs::requiresSMChange(const SMEAttrs &Callee,
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bool BodyOverridesInterface) const {
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// If the transition is not through a call (e.g. when considering inlining)
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// and Callee has a streaming body, then we can ignore the interface of
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// Callee.
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if (BodyOverridesInterface && Callee.hasStreamingBody()) {
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return hasStreamingInterfaceOrBody() ? std::nullopt
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: std::optional<bool>(true);
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}
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if (Callee.hasStreamingCompatibleInterface())
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return std::nullopt;
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// Both non-streaming
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if (hasNonStreamingInterfaceAndBody() && Callee.hasNonStreamingInterface())
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return std::nullopt;
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// Both streaming
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if (hasStreamingInterfaceOrBody() && Callee.hasStreamingInterface())
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return std::nullopt;
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return Callee.hasStreamingInterface();
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}
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