PPC/s390: [arm][arm64] Remove dead code

Port cc12e947

R=georgia.kouveli@arm.com, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=
LOG=N

Change-Id: I58e35c6fc007b01db4a51f93bff995ce8c14c37a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2071512Reviewed-by: Junliang Yan <jyan@ca.ibm.com>
Commit-Queue: Milad Farazmand <miladfar@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#66435}

src/codegen/ppc/macro-assembler-ppc.cc

@@ -673,23 +673,6 @@ void TurboAssembler::RestoreFrameStateForTailCall() {
   mtlr(r0);
 }
 
-int MacroAssembler::SafepointRegisterStackIndex(int reg_code) {
-  // The registers are pushed starting with the highest encoding,
-  // which means that lowest encodings are closest to the stack pointer.
-  RegList regs = kSafepointSavedRegisters;
-  int index = 0;
-
-  DCHECK(reg_code >= 0 && reg_code < kNumRegisters);
-
-  for (int16_t i = 0; i < reg_code; i++) {
-    if ((regs & (1 << i)) != 0) {
-      index++;
-    }
-  }
-
-  return index;
-}
-
 void TurboAssembler::CanonicalizeNaN(const DoubleRegister dst,
                                      const DoubleRegister src) {
   // Turn potential sNaN into qNaN.

src/codegen/ppc/macro-assembler-ppc.h

@@ -952,13 +952,6 @@ class V8_EXPORT_PRIVATE MacroAssembler : public TurboAssembler {
                       Register actual_parameter_count, Label* done,
                       InvokeFlag flag);
 
-  // Compute memory operands for safepoint stack slots.
-  static int SafepointRegisterStackIndex(int reg_code);
-
-  // Needs access to SafepointRegisterStackIndex for compiled frame
-  // traversal.
-  friend class StandardFrame;
-
   DISALLOW_IMPLICIT_CONSTRUCTORS(MacroAssembler);
 };
 

src/codegen/ppc/register-ppc.h

@@ -59,7 +59,6 @@ namespace internal {
 
 // Register list in load/store instructions
 // Note that the bit values must match those used in actual instruction encoding
-const int kNumRegs = 32;
 
 // Caller-saved/arguments registers
 const RegList kJSCallerSaved = 1 << 3 |   // r3  a1
@@ -138,10 +137,6 @@ const RegList kCalleeSavedDoubles = 1 << 14 |  // d14
 
 const int kNumCalleeSavedDoubles = 18;
 
-// Number of registers for which space is reserved in safepoints. Must be a
-// multiple of 8.
-const int kNumSafepointRegisters = 32;
-
 // The following constants describe the stack frame linkage area as
 // defined by the ABI.  Note that kNumRequiredStackFrameSlots must
 // satisfy alignment requirements (rounding up if required).
@@ -177,12 +172,6 @@ const int kStackFrameLRSlot = 2;
 const int kStackFrameExtraParamSlot = 14;
 #endif
 
-// Define the list of registers actually saved at safepoints.
-// Note that the number of saved registers may be smaller than the reserved
-// space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters.
-const RegList kSafepointSavedRegisters = kJSCallerSaved | kCalleeSaved;
-const int kNumSafepointSavedRegisters = kNumJSCallerSaved + kNumCalleeSaved;
-
 enum RegisterCode {
 #define REGISTER_CODE(R) kRegCode_##R,
   GENERAL_REGISTERS(REGISTER_CODE)

src/codegen/s390/macro-assembler-s390.cc

@@ -670,23 +670,6 @@ void TurboAssembler::RestoreFrameStateForTailCall() {
   LoadP(fp, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
 }
 
-int MacroAssembler::SafepointRegisterStackIndex(int reg_code) {
-  // The registers are pushed starting with the highest encoding,
-  // which means that lowest encodings are closest to the stack pointer.
-  RegList regs = kSafepointSavedRegisters;
-  int index = 0;
-
-  DCHECK(reg_code >= 0 && reg_code < kNumRegisters);
-
-  for (int16_t i = 0; i < reg_code; i++) {
-    if ((regs & (1 << i)) != 0) {
-      index++;
-    }
-  }
-
-  return index;
-}
-
 void TurboAssembler::CanonicalizeNaN(const DoubleRegister dst,
                                      const DoubleRegister src) {
   // Turn potential sNaN into qNaN

src/codegen/s390/macro-assembler-s390.h

@@ -1279,13 +1279,6 @@ class V8_EXPORT_PRIVATE MacroAssembler : public TurboAssembler {
                       Register actual_parameter_count, Label* done,
                       InvokeFlag flag);
 
-  // Compute memory operands for safepoint stack slots.
-  static int SafepointRegisterStackIndex(int reg_code);
-
-  // Needs access to SafepointRegisterStackIndex for compiled frame
-  // traversal.
-  friend class StandardFrame;
-
   DISALLOW_IMPLICIT_CONSTRUCTORS(MacroAssembler);
 };
 

src/codegen/s390/register-s390.h

@@ -38,7 +38,6 @@ namespace internal {
 
 // Register list in load/store instructions
 // Note that the bit values must match those used in actual instruction encoding
-const int kNumRegs = 16;
 
 // Caller-saved/arguments registers
 const RegList kJSCallerSaved = 1 << 1 | 1 << 2 |  // r2  a1
@@ -87,17 +86,6 @@ const RegList kCalleeSavedDoubles = 1 << 8 |   // d8
 
 const int kNumCalleeSavedDoubles = 8;
 
-// Number of registers for which space is reserved in safepoints. Must be a
-// multiple of 8.
-// TODO(regis): Only 8 registers may actually be sufficient. Revisit.
-const int kNumSafepointRegisters = 16;
-
-// Define the list of registers actually saved at safepoints.
-// Note that the number of saved registers may be smaller than the reserved
-// space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters.
-const RegList kSafepointSavedRegisters = kJSCallerSaved | kCalleeSaved;
-const int kNumSafepointSavedRegisters = kNumJSCallerSaved + kNumCalleeSaved;
-
 // The following constants describe the stack frame linkage area as
 // defined by the ABI.