[MachineFrameInfo] Refactoring with computeMaxcallFrameSize() (NFC)

llvm/include/llvm/CodeGen/MachineFrameInfo.h

@@ -638,13 +638,17 @@ class MachineFrameInfo {
   bool hasTailCall() const { return HasTailCall; }
   void setHasTailCall(bool V = true) { HasTailCall = V; }
 
-  /// Computes the maximum size of a callframe and the AdjustsStack property.
+  /// Computes the maximum size of a callframe.
   /// This only works for targets defining
   /// TargetInstrInfo::getCallFrameSetupOpcode(), getCallFrameDestroyOpcode(),
   /// and getFrameSize().
   /// This is usually computed by the prologue epilogue inserter but some
   /// targets may call this to compute it earlier.
-  void computeMaxCallFrameSize(const MachineFunction &MF);
+  /// If FrameSDOps is passed, the frame instructions in the MF will be
+  /// inserted into it.
+  void computeMaxCallFrameSize(
+      MachineFunction &MF,
+      std::vector<MachineBasicBlock::iterator> *FrameSDOps = nullptr);
 
   /// Return the maximum size of a call frame that must be
   /// allocated for an outgoing function call.  This is only available if

llvm/include/llvm/CodeGen/TargetInstrInfo.h

@@ -204,6 +204,7 @@ class TargetInstrInfo : public MCInstrInfo {
   /// if they exist (-1 otherwise).  Some targets use pseudo instructions in
   /// order to abstract away the difference between operating with a frame
   /// pointer and operating without, through the use of these two instructions.
+  /// A FrameSetup MI in MF implies MFI::AdjustsStack.
   ///
   unsigned getCallFrameSetupOpcode() const { return CallFrameSetupOpcode; }
   unsigned getCallFrameDestroyOpcode() const { return CallFrameDestroyOpcode; }

llvm/lib/CodeGen/FinalizeISel.cpp

@@ -14,8 +14,10 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
+#include "llvm/CodeGen/TargetInstrInfo.h"
 #include "llvm/CodeGen/TargetLowering.h"
 #include "llvm/CodeGen/TargetSubtargetInfo.h"
 #include "llvm/InitializePasses.h"
@@ -45,6 +47,7 @@ INITIALIZE_PASS(FinalizeISel, DEBUG_TYPE,
 
 bool FinalizeISel::runOnMachineFunction(MachineFunction &MF) {
   bool Changed = false;
+  const TargetInstrInfo *TII = MF.getSubtarget().getInstrInfo();
   const TargetLowering *TLI = MF.getSubtarget().getTargetLowering();
 
   // Iterate through each instruction in the function, looking for pseudos.
@@ -54,6 +57,12 @@ bool FinalizeISel::runOnMachineFunction(MachineFunction &MF) {
          MBBI != MBBE; ) {
       MachineInstr &MI = *MBBI++;
 
+      // Set AdjustsStack to true if the instruction selector emits a stack
+      // frame setup instruction or a stack aligning inlineasm.
+      if (MI.getOpcode() == TII->getCallFrameSetupOpcode() ||
+          MI.isStackAligningInlineAsm())
+        MF.getFrameInfo().setAdjustsStack(true);
+
       // If MI is a pseudo, expand it.
       if (MI.usesCustomInsertionHook()) {
         Changed = true;

llvm/lib/CodeGen/MachineFrameInfo.cpp

@@ -184,26 +184,23 @@ uint64_t MachineFrameInfo::estimateStackSize(const MachineFunction &MF) const {
   return alignTo(Offset, StackAlign);
 }
 
-void MachineFrameInfo::computeMaxCallFrameSize(const MachineFunction &MF) {
+void MachineFrameInfo::computeMaxCallFrameSize(
+    MachineFunction &MF, std::vector<MachineBasicBlock::iterator> *FrameSDOps) {
   const TargetInstrInfo &TII = *MF.getSubtarget().getInstrInfo();
   unsigned FrameSetupOpcode = TII.getCallFrameSetupOpcode();
   unsigned FrameDestroyOpcode = TII.getCallFrameDestroyOpcode();
   assert(FrameSetupOpcode != ~0u && FrameDestroyOpcode != ~0u &&
          "Can only compute MaxCallFrameSize if Setup/Destroy opcode are known");
 
   MaxCallFrameSize = 0;
-  for (const MachineBasicBlock &MBB : MF) {
-    for (const MachineInstr &MI : MBB) {
+  for (MachineBasicBlock &MBB : MF) {
+    for (MachineInstr &MI : MBB) {
       unsigned Opcode = MI.getOpcode();
       if (Opcode == FrameSetupOpcode || Opcode == FrameDestroyOpcode) {
         unsigned Size = TII.getFrameSize(MI);
         MaxCallFrameSize = std::max(MaxCallFrameSize, Size);
-        AdjustsStack = true;
-      } else if (MI.isInlineAsm()) {
-        // Some inline asm's need a stack frame, as indicated by operand 1.
-        unsigned ExtraInfo = MI.getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
-        if (ExtraInfo & InlineAsm::Extra_IsAlignStack)
-          AdjustsStack = true;
+        if (FrameSDOps != nullptr)
+          FrameSDOps->push_back(&MI);
       }
     }
   }

llvm/lib/CodeGen/PrologEpilogInserter.cpp

@@ -228,9 +228,8 @@ bool PEI::runOnMachineFunction(MachineFunction &MF) {
   FrameIndexVirtualScavenging = TRI->requiresFrameIndexScavenging(MF);
   ORE = &getAnalysis<MachineOptimizationRemarkEmitterPass>().getORE();
 
-  // Calculate the MaxCallFrameSize and AdjustsStack variables for the
-  // function's frame information. Also eliminates call frame pseudo
-  // instructions.
+  // Calculate the MaxCallFrameSize value for the function's frame
+  // information. Also eliminates call frame pseudo instructions.
   calculateCallFrameInfo(MF);
 
   // Determine placement of CSR spill/restore code and prolog/epilog code:
@@ -350,17 +349,13 @@ bool PEI::runOnMachineFunction(MachineFunction &MF) {
   return true;
 }
 
-/// Calculate the MaxCallFrameSize and AdjustsStack
-/// variables for the function's frame information and eliminate call frame
-/// pseudo instructions.
+/// Calculate the MaxCallFrameSize variable for the function's frame
+/// information and eliminate call frame pseudo instructions.
 void PEI::calculateCallFrameInfo(MachineFunction &MF) {
   const TargetInstrInfo &TII = *MF.getSubtarget().getInstrInfo();
   const TargetFrameLowering *TFI = MF.getSubtarget().getFrameLowering();
   MachineFrameInfo &MFI = MF.getFrameInfo();
 
-  unsigned MaxCallFrameSize = 0;
-  bool AdjustsStack = MFI.adjustsStack();
-
   // Get the function call frame set-up and tear-down instruction opcode
   unsigned FrameSetupOpcode = TII.getCallFrameSetupOpcode();
   unsigned FrameDestroyOpcode = TII.getCallFrameDestroyOpcode();
@@ -370,26 +365,15 @@ void PEI::calculateCallFrameInfo(MachineFunction &MF) {
   if (FrameSetupOpcode == ~0u && FrameDestroyOpcode == ~0u)
     return;
 
+  // (Re-)Compute the MaxCallFrameSize.
+  uint32_t MaxCFSIn =
+      MFI.isMaxCallFrameSizeComputed() ? MFI.getMaxCallFrameSize() : UINT32_MAX;
   std::vector<MachineBasicBlock::iterator> FrameSDOps;
-  for (MachineBasicBlock &BB : MF)
-    for (MachineBasicBlock::iterator I = BB.begin(); I != BB.end(); ++I)
-      if (TII.isFrameInstr(*I)) {
-        unsigned Size = TII.getFrameSize(*I);
-        if (Size > MaxCallFrameSize) MaxCallFrameSize = Size;
-        AdjustsStack = true;
-        FrameSDOps.push_back(I);
-      } else if (I->isInlineAsm()) {
-        // Some inline asm's need a stack frame, as indicated by operand 1.
-        unsigned ExtraInfo = I->getOperand(InlineAsm::MIOp_ExtraInfo).getImm();
-        if (ExtraInfo & InlineAsm::Extra_IsAlignStack)
-          AdjustsStack = true;
-      }
-
-  assert(!MFI.isMaxCallFrameSizeComputed() ||
-         (MFI.getMaxCallFrameSize() >= MaxCallFrameSize &&
-          !(AdjustsStack && !MFI.adjustsStack())));
-  MFI.setAdjustsStack(AdjustsStack);
-  MFI.setMaxCallFrameSize(MaxCallFrameSize);
+  MFI.computeMaxCallFrameSize(MF, &FrameSDOps);
+  assert(MFI.getMaxCallFrameSize() <= MaxCFSIn &&
+         "Recomputing MaxCFS gave a larger value.");
+  assert((FrameSDOps.empty() || MF.getFrameInfo().adjustsStack()) &&
+         "AdjustsStack not set in presence of a frame pseudo instruction.");
 
   if (TFI->canSimplifyCallFramePseudos(MF)) {
     // If call frames are not being included as part of the stack frame, and

llvm/lib/Target/PowerPC/PPCTLSDynamicCall.cpp

@@ -25,6 +25,7 @@
 #include "PPCInstrInfo.h"
 #include "PPCTargetMachine.h"
 #include "llvm/CodeGen/LiveIntervals.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/InitializePasses.h"
@@ -159,9 +160,11 @@ namespace {
         // We don't really need to save data to the stack - the clobbered
         // registers are already saved when the SDNode (e.g. PPCaddiTlsgdLAddr)
         // gets translated to the pseudo instruction (e.g. ADDItlsgdLADDR).
-        if (NeedFence)
+        if (NeedFence) {
+          MBB.getParent()->getFrameInfo().setAdjustsStack(true);
           BuildMI(MBB, I, DL, TII->get(PPC::ADJCALLSTACKDOWN)).addImm(0)
                                                               .addImm(0);
+        }
 
         if (IsAIX) {
           if (IsTLSLDAIXMI) {

llvm/lib/Target/X86/X86ISelLowering.cpp

@@ -35228,6 +35228,7 @@ X86TargetLowering::EmitLoweredTLSAddr(MachineInstr &MI,
   MachineFunction &MF = *BB->getParent();
 
   // Emit CALLSEQ_START right before the instruction.
+  BB->getParent()->getFrameInfo().setAdjustsStack(true);
   unsigned AdjStackDown = TII.getCallFrameSetupOpcode();
   MachineInstrBuilder CallseqStart =
       BuildMI(MF, MIMD, TII.get(AdjStackDown)).addImm(0).addImm(0).addImm(0);

llvm/test/CodeGen/AArch64/avoid-zero-copy.mir

@@ -19,6 +19,8 @@
 ...
 ---
 name: foo
+frameInfo:
+  adjustsStack:    true
 body: |
   bb.0 (%ir-block.0):
     ; CHECK-LABEL: name: foo

llvm/test/CodeGen/AArch64/stack-probing-no-scratch-reg.mir

@@ -29,6 +29,7 @@ tracksRegLiveness: true
 liveins:
   - { reg: '$w0', virtual-reg: '' }
 frameInfo:
+  adjustsStack:    true
   localFrameSize:  150000
 stack:
   - { id: 0, name: a, type: default, offset: 0, size: 150000, alignment: 8,

llvm/test/CodeGen/AArch64/stack-probing-shrink-wrap.mir

@@ -31,6 +31,7 @@ tracksRegLiveness: true
 liveins:
   - { reg: '$w0', virtual-reg: '' }
 frameInfo:
+  adjustsStack:    true
   localFrameSize:  150000
 stack:
   - { id: 0, name: a, type: default, offset: 0, size: 150000, alignment: 8,

llvm/test/CodeGen/AArch64/wrong-callee-save-size-after-livedebugvariables.mir

@@ -64,6 +64,7 @@
 name:            foo
 tracksRegLiveness: true
 frameInfo:
+  adjustsStack:    true
   hasCalls:        true
 fixedStack:      []
 stack:

llvm/test/CodeGen/AMDGPU/av_spill_cross_bb_usage.mir

@@ -14,6 +14,8 @@
 ---
 name:            test_av_spill_cross_bb_usage
 tracksRegLiveness: true
+frameInfo:
+  adjustsStack:    true
 stack:
   - { id: 0, name: '', type: spill-slot, offset: 0, size: 4, alignment: 4 }
 machineFunctionInfo:

llvm/test/CodeGen/Hexagon/livephysregs-regmask-clobber.mir

@@ -17,6 +17,8 @@
 
 name: f0
 tracksRegLiveness: true
+frameInfo:
+  adjustsStack:    true
 stack:
   - { id: 0, offset: 0, size: 128, alignment: 128 }
   - { id: 1, offset: 128, size: 128, alignment: 128 }

llvm/test/CodeGen/MIR/AMDGPU/stack-id-assert.mir

@@ -29,6 +29,8 @@ liveins:
   - { reg: '$vgpr0', virtual-reg: '' }
   - { reg: '$vgpr1', virtual-reg: '' }
   - { reg: '$vgpr2', virtual-reg: '' }
+frameInfo:
+  adjustsStack:    true
 stack:
   - { id: 0, name: '', type: spill-slot, offset: 0, size: 8, alignment: 4,
       stack-id: sgpr-spill, callee-saved-register: '', callee-saved-restored: true,

llvm/test/CodeGen/Mips/avoid-zero-copy.mir

@@ -19,6 +19,8 @@
 ...
 ---
 name:            a
+frameInfo:
+  adjustsStack:    true
 body:             |
   bb.0 (%ir-block.0):
     liveins: $a0_64, $t9_64, $ra_64, $fp_64, $gp_64

llvm/test/CodeGen/Mips/msa/emergency-spill.mir

@@ -90,7 +90,7 @@ frameInfo:
   stackSize:       0
   offsetAdjustment: 0
   maxAlignment:    16
-  adjustsStack:    false
+  adjustsStack:    true
   hasCalls:        true
   stackProtector:  ''
   maxCallFrameSize: 4294967295

llvm/test/CodeGen/RISCV/live-sp.mir

@@ -44,7 +44,7 @@ frameInfo:
   stackSize:       0
   offsetAdjustment: 0
   maxAlignment:    4
-  adjustsStack:    false
+  adjustsStack:    true
   hasCalls:        true
   stackProtector:  ''
   maxCallFrameSize: 4294967295

llvm/test/CodeGen/RISCV/rvv/addi-rvv-stack-object.mir

@@ -22,7 +22,7 @@ frameInfo:
   stackSize:       0
   offsetAdjustment: 0
   maxAlignment:    16
-  adjustsStack:    false
+  adjustsStack:    true
   hasCalls:        true
   stackProtector:  ''
   functionContext: ''

llvm/test/CodeGen/RISCV/rvv/rvv-stack-align.mir

@@ -159,7 +159,7 @@ frameInfo:
   stackSize:       0
   offsetAdjustment: 0
   maxAlignment:    8
-  adjustsStack:    false
+  adjustsStack:    true
   hasCalls:        true
   stackProtector:  ''
   maxCallFrameSize: 4294967295
@@ -204,7 +204,7 @@ frameInfo:
   stackSize:       0
   offsetAdjustment: 0
   maxAlignment:    16
-  adjustsStack:    false
+  adjustsStack:    true
   hasCalls:        true
   stackProtector:  ''
   maxCallFrameSize: 4294967295
@@ -249,7 +249,7 @@ frameInfo:
   stackSize:       0
   offsetAdjustment: 0
   maxAlignment:    32
-  adjustsStack:    false
+  adjustsStack:    true
   hasCalls:        true
   stackProtector:  ''
   maxCallFrameSize: 4294967295

llvm/test/CodeGen/RISCV/rvv/wrong-stack-offset-for-rvv-object.mir

@@ -83,7 +83,7 @@ frameInfo:
   stackSize:       0
   offsetAdjustment: 0
   maxAlignment:    8
-  adjustsStack:    false
+  adjustsStack:    true
   hasCalls:        true
   stackProtector:  ''
   maxCallFrameSize: 4294967295

llvm/test/CodeGen/RISCV/stack-inst-compress.mir

@@ -32,6 +32,7 @@ alignment:       2
 tracksRegLiveness: true
 frameInfo:
   maxAlignment:    4
+  adjustsStack:    true
   hasCalls:        true
   localFrameSize:  2048
 stack:
@@ -117,6 +118,7 @@ alignment:       2
 tracksRegLiveness: true
 frameInfo:
   maxAlignment:    4
+  adjustsStack:    true
   hasCalls:        true
   localFrameSize:  4096
 stack:
@@ -210,6 +212,7 @@ alignment:       2
 tracksRegLiveness: true
 frameInfo:
   maxAlignment:    4
+  adjustsStack:    true
   hasCalls:        true
   localFrameSize:  8192
 stack:

llvm/test/CodeGen/SystemZ/cond-move-04.mir

@@ -53,6 +53,7 @@ registers:
   - { id: 10, class: gr64bit }
   - { id: 11, class: gr32bit }
 frameInfo:       
+  adjustsStack:    true
   hasCalls:        true
 body:             |
   bb.0 (%ir-block.1):

llvm/test/CodeGen/SystemZ/cond-move-08.mir

@@ -116,6 +116,7 @@ registers:
   - { id: 27, class: grx32bit }
   - { id: 28, class: addr64bit }
 frameInfo:
+  adjustsStack:    true
   hasCalls:        true
 body:             |
   bb.0.bb5:

llvm/test/CodeGen/SystemZ/cond-move-regalloc-hints-02.mir

@@ -30,6 +30,7 @@ registers:
   - { id: 11, class: gr32bit }
 frameInfo:
   maxAlignment:    1
+  adjustsStack:    true
   hasCalls:        true
 machineFunctionInfo: {}
 body:             |

llvm/test/CodeGen/SystemZ/cond-move-regalloc-hints.mir

@@ -192,6 +192,7 @@ liveins:
   - { reg: '$r2d', virtual-reg: '%31' }
   - { reg: '$r3d', virtual-reg: '%32' }
 frameInfo:       
+  adjustsStack:    true
   hasCalls:        true
 body:             |
   bb.0.bb:

llvm/test/CodeGen/SystemZ/frame-28.mir

@@ -162,6 +162,8 @@ body:             |
 ---
 name:            fun4
 tracksRegLiveness: true
+frameInfo:
+  adjustsStack:    true
 stack:
   - { id: 0, size: 5000 }
   - { id: 1, size: 2500 }

llvm/test/CodeGen/X86/fast-regalloc-live-out-debug-values.mir

@@ -119,6 +119,7 @@
 name:            foo
 tracksRegLiveness: true
 frameInfo:
+  adjustsStack:    true
   hasCalls:        true
 stack:
   - { id: 0, name: a.addr, size: 4, alignment: 4, debug-info-variable: '!11',