[ARM] Add the non-MVE instructions in Arm v8.1-M.

This adds support for the new family of conditional selection /
increment / negation instructions; the low-overhead branch
instructions (e.g. BF, WLS, DLS); the CLRM instruction to zero a whole
list of registers at once; the new VMRS/VMSR and VLDR/VSTR
instructions to get data in and out of 8.1-M system registers,
particularly including the new VPR register used by MVE vector
predication.

To support this, we also add a register name 'zr' (used by the CSEL
family to force one of the inputs to the constant 0), and operand
types for lists of registers that are also allowed to include APSR or
VPR (used by CLRM). The VLDR/VSTR instructions also need a new
addressing mode.

The low-overhead branch instructions exist in their own separate
architecture extension, which we treat as enabled by default, but you
can say -mattr=-lob or equivalent to turn it off.

Reviewers: dmgreen, samparker, SjoerdMeijer, t.p.northover

Reviewed By: samparker

Subscribers: miyuki, javed.absar, kristof.beyls, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62667

llvm-svn: 363039

1 files changed, 24 insertions, 5 deletions

diff --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMInstPrinter.cpp b/llvm/lib/Target/ARM/MCTargetDesc/ARMInstPrinter.cpp
index ec5fd16cd7d..271959c38de 100644
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMInstPrinter.cpp
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMInstPrinter.cpp
@@ -771,11 +771,13 @@ void ARMInstPrinter::printPKHASRShiftImm(const MCInst *MI, unsigned OpNum,
 void ARMInstPrinter::printRegisterList(const MCInst *MI, unsigned OpNum,
                                        const MCSubtargetInfo &STI,
                                        raw_ostream &O) {
-  assert(std::is_sorted(MI->begin() + OpNum, MI->end(),
-                        [&](const MCOperand &LHS, const MCOperand &RHS) {
-                          return MRI.getEncodingValue(LHS.getReg()) <
-                                 MRI.getEncodingValue(RHS.getReg());
-                        }));
+  if (MI->getOpcode() != ARM::t2CLRM) {
+    assert(std::is_sorted(MI->begin() + OpNum, MI->end(),
+                          [&](const MCOperand &LHS, const MCOperand &RHS) {
+                            return MRI.getEncodingValue(LHS.getReg()) <
+                                   MRI.getEncodingValue(RHS.getReg());
+                          }));
+  }
 
   O << "{";
   for (unsigned i = OpNum, e = MI->getNumOperands(); i != e; ++i) {
@@ -930,6 +932,15 @@ void ARMInstPrinter::printPredicateOperand(const MCInst *MI, unsigned OpNum,
     O << ARMCondCodeToString(CC);
 }
 
+void ARMInstPrinter::printMandatoryRestrictedPredicateOperand(
+    const MCInst *MI, unsigned OpNum, const MCSubtargetInfo &STI,
+    raw_ostream &O) {
+  if ((ARMCC::CondCodes)MI->getOperand(OpNum).getImm() == ARMCC::HS)
+    O << "cs";
+  else
+    printMandatoryPredicateOperand(MI, OpNum, STI, O);
+}
+
 void ARMInstPrinter::printMandatoryPredicateOperand(const MCInst *MI,
                                                     unsigned OpNum,
                                                     const MCSubtargetInfo &STI,
@@ -938,6 +949,14 @@ void ARMInstPrinter::printMandatoryPredicateOperand(const MCInst *MI,
   O << ARMCondCodeToString(CC);
 }
 
+void ARMInstPrinter::printMandatoryInvertedPredicateOperand(const MCInst *MI,
+                                                            unsigned OpNum,
+                                                            const MCSubtargetInfo &STI,
+                                                            raw_ostream &O) {
+  ARMCC::CondCodes CC = (ARMCC::CondCodes)MI->getOperand(OpNum).getImm();
+  O << ARMCondCodeToString(ARMCC::getOppositeCondition(CC));
+}
+
 void ARMInstPrinter::printSBitModifierOperand(const MCInst *MI, unsigned OpNum,
                                               const MCSubtargetInfo &STI,
                                               raw_ostream &O) {