AArch64: annotate atomics with dropped acquire semantics when printing.
A quirk of the v8.1a spec is that when the writeback regiser for an atomic read-modify-write instruction is wzr/xzr, the instruction no longer enforces acquire ordering. However, it's still written with the misleading 'a' mnemonic. So this adds an annotation when disassembling such instructions, mentioning the change. llvm-svn: 353303
This commit is contained in:
Tim Northover
parent
e84fbb67a1
commit
71025a2f3e
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@ -54,8 +54,6 @@ public:
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AU.setPreservesCFG();
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AU.setPreservesCFG();
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MachineFunctionPass::getAnalysisUsage(AU);
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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}
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bool shouldSkip(const MachineInstr &MI, const MachineFunction &MF) const;
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};
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};
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char AArch64DeadRegisterDefinitions::ID = 0;
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char AArch64DeadRegisterDefinitions::ID = 0;
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} // end anonymous namespace
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} // end anonymous namespace
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@ -70,63 +68,6 @@ static bool usesFrameIndex(const MachineInstr &MI) {
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return false;
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return false;
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}
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}
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bool
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AArch64DeadRegisterDefinitions::shouldSkip(const MachineInstr &MI,
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const MachineFunction &MF) const {
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if (!MF.getSubtarget<AArch64Subtarget>().hasLSE())
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return false;
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#define CASE_AARCH64_ATOMIC_(PREFIX) \
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case AArch64::PREFIX##X: \
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case AArch64::PREFIX##W: \
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case AArch64::PREFIX##H: \
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case AArch64::PREFIX##B
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for (const MachineMemOperand *MMO : MI.memoperands()) {
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if (MMO->isAtomic()) {
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unsigned Opcode = MI.getOpcode();
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switch (Opcode) {
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default:
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return false;
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break;
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CASE_AARCH64_ATOMIC_(LDADDA):
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CASE_AARCH64_ATOMIC_(LDADDAL):
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CASE_AARCH64_ATOMIC_(LDCLRA):
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CASE_AARCH64_ATOMIC_(LDCLRAL):
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CASE_AARCH64_ATOMIC_(LDEORA):
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CASE_AARCH64_ATOMIC_(LDEORAL):
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CASE_AARCH64_ATOMIC_(LDSETA):
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CASE_AARCH64_ATOMIC_(LDSETAL):
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CASE_AARCH64_ATOMIC_(LDSMAXA):
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CASE_AARCH64_ATOMIC_(LDSMAXAL):
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CASE_AARCH64_ATOMIC_(LDSMINA):
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CASE_AARCH64_ATOMIC_(LDSMINAL):
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CASE_AARCH64_ATOMIC_(LDUMAXA):
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CASE_AARCH64_ATOMIC_(LDUMAXAL):
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CASE_AARCH64_ATOMIC_(LDUMINA):
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CASE_AARCH64_ATOMIC_(LDUMINAL):
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CASE_AARCH64_ATOMIC_(SWPA):
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CASE_AARCH64_ATOMIC_(SWPAL):
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return true;
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break;
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}
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}
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}
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#undef CASE_AARCH64_ATOMIC_
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return false;
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}
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void AArch64DeadRegisterDefinitions::processMachineBasicBlock(
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void AArch64DeadRegisterDefinitions::processMachineBasicBlock(
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MachineBasicBlock &MBB) {
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MachineBasicBlock &MBB) {
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const MachineFunction &MF = *MBB.getParent();
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const MachineFunction &MF = *MBB.getParent();
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@ -147,9 +88,8 @@ void AArch64DeadRegisterDefinitions::processMachineBasicBlock(
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continue;
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continue;
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}
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}
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if (shouldSkip(MI, MF)) {
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if (atomicBarrierDroppedOnZero(MI.getOpcode())) {
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LLVM_DEBUG(dbgs() << " Ignoring, Atomic instruction with acquire "
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LLVM_DEBUG(dbgs() << " Ignoring, semantics change with xzr/wzr.\n");
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"semantics using WZR/XZR\n");
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continue;
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continue;
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}
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}
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@ -69,6 +69,11 @@ void AArch64InstPrinter::printInst(const MCInst *MI, raw_ostream &O,
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return;
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return;
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}
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}
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if (atomicBarrierDroppedOnZero(Opcode) &&
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(MI->getOperand(0).getReg() == AArch64::XZR ||
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MI->getOperand(0).getReg() == AArch64::WZR))
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printAnnotation(O, "acquire semantics dropped since destination is zero");
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// SBFM/UBFM should print to a nicer aliased form if possible.
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// SBFM/UBFM should print to a nicer aliased form if possible.
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if (Opcode == AArch64::SBFMXri || Opcode == AArch64::SBFMWri ||
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if (Opcode == AArch64::SBFMXri || Opcode == AArch64::SBFMWri ||
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Opcode == AArch64::UBFMXri || Opcode == AArch64::UBFMWri) {
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Opcode == AArch64::UBFMXri || Opcode == AArch64::UBFMWri) {
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@ -185,6 +185,49 @@ static inline unsigned getDRegFromBReg(unsigned Reg) {
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return Reg;
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return Reg;
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}
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}
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static inline bool atomicBarrierDroppedOnZero(unsigned Opcode) {
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switch (Opcode) {
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case AArch64::LDADDAB: case AArch64::LDADDAH:
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case AArch64::LDADDAW: case AArch64::LDADDAX:
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case AArch64::LDADDALB: case AArch64::LDADDALH:
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case AArch64::LDADDALW: case AArch64::LDADDALX:
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case AArch64::LDCLRAB: case AArch64::LDCLRAH:
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case AArch64::LDCLRAW: case AArch64::LDCLRAX:
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case AArch64::LDCLRALB: case AArch64::LDCLRALH:
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case AArch64::LDCLRALW: case AArch64::LDCLRALX:
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case AArch64::LDEORAB: case AArch64::LDEORAH:
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case AArch64::LDEORAW: case AArch64::LDEORAX:
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case AArch64::LDEORALB: case AArch64::LDEORALH:
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case AArch64::LDEORALW: case AArch64::LDEORALX:
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case AArch64::LDSETAB: case AArch64::LDSETAH:
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case AArch64::LDSETAW: case AArch64::LDSETAX:
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case AArch64::LDSETALB: case AArch64::LDSETALH:
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case AArch64::LDSETALW: case AArch64::LDSETALX:
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case AArch64::LDSMAXAB: case AArch64::LDSMAXAH:
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case AArch64::LDSMAXAW: case AArch64::LDSMAXAX:
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case AArch64::LDSMAXALB: case AArch64::LDSMAXALH:
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case AArch64::LDSMAXALW: case AArch64::LDSMAXALX:
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case AArch64::LDSMINAB: case AArch64::LDSMINAH:
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case AArch64::LDSMINAW: case AArch64::LDSMINAX:
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case AArch64::LDSMINALB: case AArch64::LDSMINALH:
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case AArch64::LDSMINALW: case AArch64::LDSMINALX:
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case AArch64::LDUMAXAB: case AArch64::LDUMAXAH:
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case AArch64::LDUMAXAW: case AArch64::LDUMAXAX:
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case AArch64::LDUMAXALB: case AArch64::LDUMAXALH:
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case AArch64::LDUMAXALW: case AArch64::LDUMAXALX:
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case AArch64::LDUMINAB: case AArch64::LDUMINAH:
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case AArch64::LDUMINAW: case AArch64::LDUMINAX:
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case AArch64::LDUMINALB: case AArch64::LDUMINALH:
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case AArch64::LDUMINALW: case AArch64::LDUMINALX:
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case AArch64::SWPAB: case AArch64::SWPAH:
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case AArch64::SWPAW: case AArch64::SWPAX:
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case AArch64::SWPALB: case AArch64::SWPALH:
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case AArch64::SWPALW: case AArch64::SWPALX:
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return true;
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}
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return false;
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}
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namespace AArch64CC {
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namespace AArch64CC {
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// The CondCodes constants map directly to the 4-bit encoding of the condition
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// The CondCodes constants map directly to the 4-bit encoding of the condition
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@ -0,0 +1,190 @@
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; RUN: llvm-mc -triple aarch64-apple-ios -mattr=+lse %s | FileCheck %s
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; CHECK: ldaddab w3, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldaddah w5, wzr, [x0] ; acquire semantics dropped since destination is zero
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; CHECK: ldadda w7, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldadda x9, xzr, [sp] ; acquire semantics dropped since destination is zero
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ldaddab w3, wzr, [x5]
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ldaddah w5, wzr, [x0]
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ldadda w7, wzr, [x5]
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ldadda x9, xzr, [sp]
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; CHECK: ldaddalb w3, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldaddalh w5, wzr, [x0] ; acquire semantics dropped since destination is zero
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; CHECK: ldaddal w7, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldaddal x9, xzr, [sp] ; acquire semantics dropped since destination is zero
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ldaddalb w3, wzr, [x5]
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ldaddalh w5, wzr, [x0]
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ldaddal w7, wzr, [x5]
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ldaddal x9, xzr, [sp]
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; CHECK: ldclrab w3, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldclrah w5, wzr, [x0] ; acquire semantics dropped since destination is zero
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; CHECK: ldclra w7, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldclra x9, xzr, [sp] ; acquire semantics dropped since destination is zero
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ldclrab w3, wzr, [x5]
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ldclrah w5, wzr, [x0]
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ldclra w7, wzr, [x5]
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ldclra x9, xzr, [sp]
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; CHECK: ldclralb w3, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldclralh w5, wzr, [x0] ; acquire semantics dropped since destination is zero
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; CHECK: ldclral w7, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldclral x9, xzr, [sp] ; acquire semantics dropped since destination is zero
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ldclralb w3, wzr, [x5]
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ldclralh w5, wzr, [x0]
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ldclral w7, wzr, [x5]
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ldclral x9, xzr, [sp]
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; CHECK: ldeorab w3, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldeorah w5, wzr, [x0] ; acquire semantics dropped since destination is zero
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; CHECK: ldeora w7, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldeora x9, xzr, [sp] ; acquire semantics dropped since destination is zero
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ldeorab w3, wzr, [x5]
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ldeorah w5, wzr, [x0]
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ldeora w7, wzr, [x5]
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ldeora x9, xzr, [sp]
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; CHECK: ldeoralb w3, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldeoralh w5, wzr, [x0] ; acquire semantics dropped since destination is zero
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; CHECK: ldeoral w7, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldeoral x9, xzr, [sp] ; acquire semantics dropped since destination is zero
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ldeoralb w3, wzr, [x5]
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ldeoralh w5, wzr, [x0]
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ldeoral w7, wzr, [x5]
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ldeoral x9, xzr, [sp]
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; CHECK: ldsetab w3, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldsetah w5, wzr, [x0] ; acquire semantics dropped since destination is zero
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; CHECK: ldseta w7, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldseta x9, xzr, [sp] ; acquire semantics dropped since destination is zero
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ldsetab w3, wzr, [x5]
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ldsetah w5, wzr, [x0]
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ldseta w7, wzr, [x5]
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ldseta x9, xzr, [sp]
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; CHECK: ldsetalb w3, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldsetalh w5, wzr, [x0] ; acquire semantics dropped since destination is zero
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; CHECK: ldsetal w7, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldsetal x9, xzr, [sp] ; acquire semantics dropped since destination is zero
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ldsetalb w3, wzr, [x5]
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ldsetalh w5, wzr, [x0]
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ldsetal w7, wzr, [x5]
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ldsetal x9, xzr, [sp]
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; CHECK: ldsmaxab w3, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldsmaxah w5, wzr, [x0] ; acquire semantics dropped since destination is zero
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; CHECK: ldsmaxa w7, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldsmaxa x9, xzr, [sp] ; acquire semantics dropped since destination is zero
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ldsmaxab w3, wzr, [x5]
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ldsmaxah w5, wzr, [x0]
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ldsmaxa w7, wzr, [x5]
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ldsmaxa x9, xzr, [sp]
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; CHECK: ldsmaxalb w3, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldsmaxalh w5, wzr, [x0] ; acquire semantics dropped since destination is zero
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; CHECK: ldsmaxal w7, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldsmaxal x9, xzr, [sp] ; acquire semantics dropped since destination is zero
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ldsmaxalb w3, wzr, [x5]
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ldsmaxalh w5, wzr, [x0]
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ldsmaxal w7, wzr, [x5]
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ldsmaxal x9, xzr, [sp]
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; CHECK: ldsminab w3, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldsminah w5, wzr, [x0] ; acquire semantics dropped since destination is zero
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; CHECK: ldsmina w7, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldsmina x9, xzr, [sp] ; acquire semantics dropped since destination is zero
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ldsminab w3, wzr, [x5]
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ldsminah w5, wzr, [x0]
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ldsmina w7, wzr, [x5]
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ldsmina x9, xzr, [sp]
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; CHECK: ldsminalb w3, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldsminalh w5, wzr, [x0] ; acquire semantics dropped since destination is zero
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; CHECK: ldsminal w7, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldsminal x9, xzr, [sp] ; acquire semantics dropped since destination is zero
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ldsminalb w3, wzr, [x5]
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ldsminalh w5, wzr, [x0]
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ldsminal w7, wzr, [x5]
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ldsminal x9, xzr, [sp]
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; CHECK: ldumaxab w3, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldumaxah w5, wzr, [x0] ; acquire semantics dropped since destination is zero
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; CHECK: ldumaxa w7, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldumaxa x9, xzr, [sp] ; acquire semantics dropped since destination is zero
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ldumaxab w3, wzr, [x5]
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ldumaxah w5, wzr, [x0]
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ldumaxa w7, wzr, [x5]
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ldumaxa x9, xzr, [sp]
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; CHECK: ldumaxalb w3, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldumaxalh w5, wzr, [x0] ; acquire semantics dropped since destination is zero
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; CHECK: ldumaxal w7, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldumaxal x9, xzr, [sp] ; acquire semantics dropped since destination is zero
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ldumaxalb w3, wzr, [x5]
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ldumaxalh w5, wzr, [x0]
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ldumaxal w7, wzr, [x5]
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ldumaxal x9, xzr, [sp]
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; CHECK: lduminab w3, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: lduminah w5, wzr, [x0] ; acquire semantics dropped since destination is zero
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; CHECK: ldumina w7, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: ldumina x9, xzr, [sp] ; acquire semantics dropped since destination is zero
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lduminab w3, wzr, [x5]
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lduminah w5, wzr, [x0]
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ldumina w7, wzr, [x5]
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ldumina x9, xzr, [sp]
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; CHECK: lduminalb w3, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: lduminalh w5, wzr, [x0] ; acquire semantics dropped since destination is zero
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; CHECK: lduminal w7, wzr, [x5] ; acquire semantics dropped since destination is zero
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; CHECK: lduminal x9, xzr, [sp] ; acquire semantics dropped since destination is zero
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lduminalb w3, wzr, [x5]
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|
lduminalh w5, wzr, [x0]
|
||||||
|
lduminal w7, wzr, [x5]
|
||||||
|
lduminal x9, xzr, [sp]
|
||||||
|
|
||||||
|
; CHECK: swpab w3, wzr, [x5] ; acquire semantics dropped since destination is zero
|
||||||
|
; CHECK: swpah w5, wzr, [x0] ; acquire semantics dropped since destination is zero
|
||||||
|
; CHECK: swpa w7, wzr, [x5] ; acquire semantics dropped since destination is zero
|
||||||
|
; CHECK: swpa x9, xzr, [sp] ; acquire semantics dropped since destination is zero
|
||||||
|
swpab w3, wzr, [x5]
|
||||||
|
swpah w5, wzr, [x0]
|
||||||
|
swpa w7, wzr, [x5]
|
||||||
|
swpa x9, xzr, [sp]
|
||||||
|
|
||||||
|
; CHECK: swpalb w3, wzr, [x5] ; acquire semantics dropped since destination is zero
|
||||||
|
; CHECK: swpalh w5, wzr, [x0] ; acquire semantics dropped since destination is zero
|
||||||
|
; CHECK: swpal w7, wzr, [x5] ; acquire semantics dropped since destination is zero
|
||||||
|
; CHECK: swpal x9, xzr, [sp] ; acquire semantics dropped since destination is zero
|
||||||
|
swpalb w3, wzr, [x5]
|
||||||
|
swpalh w5, wzr, [x0]
|
||||||
|
swpal w7, wzr, [x5]
|
||||||
|
swpal x9, xzr, [sp]
|
||||||
|
|
||||||
|
; CHECK: ldaddal xzr, x3, [x0]{{$}}
|
||||||
|
; CHECK: ldeora wzr, w7, [x5]{{$}}
|
||||||
|
; CHECK: ldsminb w5, w9, [sp]{{$}}
|
||||||
|
ldaddal xzr, x3, [x0]
|
||||||
|
ldeora wzr, w7, [x5]
|
||||||
|
ldsminb w5, w9, [sp]
|
||||||
|
|
||||||
|
; CAS instructions aren't affected.
|
||||||
|
|
||||||
|
; CHECK: casab w3, wzr, [x5]{{$}}
|
||||||
|
; CHECK: casah w5, wzr, [x0]{{$}}
|
||||||
|
; CHECK: casa w7, wzr, [x5]{{$}}
|
||||||
|
; CHECK: casa x9, xzr, [sp]{{$}}
|
||||||
|
casab w3, wzr, [x5]
|
||||||
|
casah w5, wzr, [x0]
|
||||||
|
casa w7, wzr, [x5]
|
||||||
|
casa x9, xzr, [sp]
|
||||||
|
|
||||||
|
; CHECK: casalb w3, wzr, [x5]{{$}}
|
||||||
|
; CHECK: casalh w5, wzr, [x0]{{$}}
|
||||||
|
; CHECK: casal w7, wzr, [x5]{{$}}
|
||||||
|
; CHECK: casal x9, xzr, [sp]{{$}}
|
||||||
|
casalb w3, wzr, [x5]
|
||||||
|
casalh w5, wzr, [x0]
|
||||||
|
casal w7, wzr, [x5]
|
||||||
|
casal x9, xzr, [sp]
|
||||||
Loading…
Reference in New Issue