Remove ARM support for soft float (pre-VFP2)

src/arm/macro-assembler-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 273 matching lines @@
 
 
 void MacroAssembler::Move(Register dst, Register src, Condition cond) {
   if (!dst.is(src)) {
     mov(dst, src, LeaveCC, cond);
   }
 }
 
 
 void MacroAssembler::Move(DwVfpRegister dst, DwVfpRegister src) {
-  ASSERT(CpuFeatures::IsSupported(VFP2));
-  CpuFeatureScope scope(this, VFP2);
   if (!dst.is(src)) {
     vmov(dst, src);
   }
 }
 
 
 void MacroAssembler::And(Register dst, Register src1, const Operand& src2,
                          Condition cond) {
   if (!src2.is_reg() &&
       !src2.must_output_reloc_info(this) &&
@@ skipping 498 matching lines @@
                                             const Register fpscr_flags,
                                             const Condition cond) {
   // Compare and load FPSCR.
   vcmp(src1, src2, cond);
   vmrs(fpscr_flags, cond);
 }
 
 void MacroAssembler::Vmov(const DwVfpRegister dst,
                           const double imm,
                           const Register scratch) {
-  ASSERT(IsEnabled(VFP2));
   static const DoubleRepresentation minus_zero(-0.0);
   static const DoubleRepresentation zero(0.0);
   DoubleRepresentation value(imm);
   // Handle special values first.
   if (value.bits == zero.bits) {
     vmov(dst, kDoubleRegZero);
   } else if (value.bits == minus_zero.bits) {
     vneg(dst, kDoubleRegZero);
   } else {
     vmov(dst, imm, scratch);
@@ skipping 41 matching lines @@
   str(ip, MemOperand(fp, ExitFrameConstants::kCodeOffset));
 
   // Save the frame pointer and the context in top.
   mov(ip, Operand(ExternalReference(Isolate::kCEntryFPAddress, isolate())));
   str(fp, MemOperand(ip));
   mov(ip, Operand(ExternalReference(Isolate::kContextAddress, isolate())));
   str(cp, MemOperand(ip));
 
   // Optionally save all double registers.
   if (save_doubles) {
-    CpuFeatureScope scope(this, VFP2);
     // Check CPU flags for number of registers, setting the Z condition flag.
     CheckFor32DRegs(ip);
 
     // Push registers d0-d15, and possibly d16-d31, on the stack.
     // If d16-d31 are not pushed, decrease the stack pointer instead.
     vstm(db_w, sp, d16, d31, ne);
     sub(sp, sp, Operand(16 * kDoubleSize), LeaveCC, eq);
     vstm(db_w, sp, d0, d15);
     // Note that d0 will be accessible at
     //   fp - 2 * kPointerSize - DwVfpRegister::kMaxNumRegisters * kDoubleSize,
@@ skipping 44 matching lines @@
   // flag.
   return FLAG_sim_stack_alignment;
 #endif  // defined(V8_HOST_ARCH_ARM)
 }
 
 
 void MacroAssembler::LeaveExitFrame(bool save_doubles,
                                     Register argument_count) {
   // Optionally restore all double registers.
   if (save_doubles) {
-    CpuFeatureScope scope(this, VFP2);
     // Calculate the stack location of the saved doubles and restore them.
     const int offset = 2 * kPointerSize;
     sub(r3, fp,
         Operand(offset + DwVfpRegister::kMaxNumRegisters * kDoubleSize));
 
     // Check CPU flags for number of registers, setting the Z condition flag.
     CheckFor32DRegs(ip);
 
     // Pop registers d0-d15, and possibly d16-d31, from r3.
     // If d16-d31 are not popped, increase r3 instead.
@@ skipping 16 matching lines @@
 
   // Tear down the exit frame, pop the arguments, and return.
   mov(sp, Operand(fp));
   ldm(ia_w, sp, fp.bit() | lr.bit());
   if (argument_count.is_valid()) {
     add(sp, sp, Operand(argument_count, LSL, kPointerSizeLog2));
   }
 }
 
 void MacroAssembler::GetCFunctionDoubleResult(const DwVfpRegister dst) {
-  ASSERT(CpuFeatures::IsSupported(VFP2));
   if (use_eabi_hardfloat()) {
     Move(dst, d0);
   } else {
     vmov(dst, r0, r1);
   }
 }
 
 
 void MacroAssembler::SetCallKind(Register dst, CallKind call_kind) {
   // This macro takes the dst register to make the code more readable
@@ skipping 1050 matching lines @@
 
   bind(&smi_value);
   add(scratch1, elements_reg,
       Operand(FixedDoubleArray::kHeaderSize - kHeapObjectTag -
               elements_offset));
   add(scratch1, scratch1,
       Operand(key_reg, LSL, kDoubleSizeLog2 - kSmiTagSize));
   // scratch1 is now effective address of the double element
 
   FloatingPointHelper::Destination destination;
-  if (CpuFeatures::IsSupported(VFP2)) {
-    destination = FloatingPointHelper::kVFPRegisters;
-  } else {
-    destination = FloatingPointHelper::kCoreRegisters;
-  }
+  destination = FloatingPointHelper::kVFPRegisters;
 
   Register untagged_value = elements_reg;
   SmiUntag(untagged_value, value_reg);
   FloatingPointHelper::ConvertIntToDouble(this,
                                           untagged_value,
                                           destination,
                                           d0,
                                           mantissa_reg,
                                           exponent_reg,
                                           scratch4,
                                           s2);
   if (destination == FloatingPointHelper::kVFPRegisters) {
-    CpuFeatureScope scope(this, VFP2);
     vstr(d0, scratch1, 0);
   } else {
     str(mantissa_reg, MemOperand(scratch1, 0));
     str(exponent_reg, MemOperand(scratch1, Register::kSizeInBytes));
   }
   bind(&done);
 }
 
 
 void MacroAssembler::CompareMap(Register obj,
@@ skipping 339 matching lines @@
                                             SwVfpRegister scratch2) {
   mov(scratch1, Operand(smi, ASR, kSmiTagSize));
   vmov(scratch2, scratch1);
   vcvt_f64_s32(value, scratch2);
 }
 
 
 void MacroAssembler::TestDoubleIsInt32(DwVfpRegister double_input,
                                        DwVfpRegister double_scratch) {
   ASSERT(!double_input.is(double_scratch));
-  ASSERT(CpuFeatures::IsSupported(VFP2));
-  CpuFeatureScope scope(this, VFP2);
-
   vcvt_s32_f64(double_scratch.low(), double_input);
   vcvt_f64_s32(double_scratch, double_scratch.low());
   VFPCompareAndSetFlags(double_input, double_scratch);
 }
 
 
 void MacroAssembler::TryDoubleToInt32Exact(Register result,
                                            DwVfpRegister double_input,
                                            DwVfpRegister double_scratch) {
   ASSERT(!double_input.is(double_scratch));
-  ASSERT(CpuFeatures::IsSupported(VFP2));
-  CpuFeatureScope scope(this, VFP2);
-
   vcvt_s32_f64(double_scratch.low(), double_input);
   vmov(result, double_scratch.low());
   vcvt_f64_s32(double_scratch, double_scratch.low());
   VFPCompareAndSetFlags(double_input, double_scratch);
 }
 
 
 void MacroAssembler::TryInt32Floor(Register result,
                                    DwVfpRegister double_input,
                                    Register input_high,
                                    DwVfpRegister double_scratch,
                                    Label* done,
                                    Label* exact) {
   ASSERT(!result.is(input_high));
   ASSERT(!double_input.is(double_scratch));
-  ASSERT(CpuFeatures::IsSupported(VFP2));
-  CpuFeatureScope scope(this, VFP2);
   Label negative, exception;
 
   // Test for NaN and infinities.
   Sbfx(result, input_high,
        HeapNumber::kExponentShift, HeapNumber::kExponentBits);
   cmp(result, Operand(-1));
   b(eq, &exception);
   // Test for values that can be exactly represented as a
   // signed 32-bit integer.
   TryDoubleToInt32Exact(result, double_input, double_scratch);
@@ skipping 24 matching lines @@
 }
 
 
 void MacroAssembler::ECMAConvertNumberToInt32(Register source,
                                               Register result,
                                               Register input_low,
                                               Register input_high,
                                               Register scratch,
                                               DwVfpRegister double_scratch1,
                                               DwVfpRegister double_scratch2) {
-  if (CpuFeatures::IsSupported(VFP2)) {
-    CpuFeatureScope scope(this, VFP2);
-    vldr(double_scratch1, FieldMemOperand(source, HeapNumber::kValueOffset));
-    ECMAToInt32VFP(result, double_scratch1, double_scratch2,
-                   scratch, input_high, input_low);
-  } else {
-    Ldrd(input_low, input_high,
-         FieldMemOperand(source, HeapNumber::kValueOffset));
-    ECMAToInt32NoVFP(result, scratch, input_high, input_low);
-  }
+  vldr(double_scratch1, FieldMemOperand(source, HeapNumber::kValueOffset));
+  ECMAToInt32(result, double_scratch1, double_scratch2,
+              scratch, input_high, input_low);
 }
 
 
-void MacroAssembler::ECMAToInt32VFP(Register result,
-                                    DwVfpRegister double_input,
-                                    DwVfpRegister double_scratch,
-                                    Register scratch,
-                                    Register input_high,
-                                    Register input_low) {
-  CpuFeatureScope scope(this, VFP2);
+void MacroAssembler::ECMAToInt32(Register result,
+                                 DwVfpRegister double_input,
+                                 DwVfpRegister double_scratch,
+                                 Register scratch,
+                                 Register input_high,
+                                 Register input_low) {
   ASSERT(!input_high.is(result));
   ASSERT(!input_low.is(result));
   ASSERT(!input_low.is(input_high));
   ASSERT(!scratch.is(result) &&
          !scratch.is(input_high) &&
          !scratch.is(input_low));
   ASSERT(!double_input.is(double_scratch));
 
   Label out_of_range, negate, done;
 
@@ skipping 19 matching lines @@
   b(ge, &out_of_range);
 
   // If we reach this code, 31 <= exponent <= 83.
   // So, we don't have to handle cases where 0 <= exponent <= 20 for
   // which we would need to shift right the high part of the mantissa.
   ECMAToInt32Tail(result, scratch, input_high, input_low,
                   &out_of_range, &negate, &done);
 }
 
 
-void MacroAssembler::ECMAToInt32NoVFP(Register result,
-                                      Register scratch,
-                                      Register input_high,
-                                      Register input_low) {
-  ASSERT(!result.is(scratch));
-  ASSERT(!result.is(input_high));
-  ASSERT(!result.is(input_low));
-  ASSERT(!scratch.is(input_high));
-  ASSERT(!scratch.is(input_low));
-  ASSERT(!input_high.is(input_low));
-
-  Label both, out_of_range, negate, done;
-
-  Ubfx(scratch, input_high,
-       HeapNumber::kExponentShift, HeapNumber::kExponentBits);
-  // Load scratch with exponent.
-  sub(scratch, scratch, Operand(HeapNumber::kExponentBias));
-  // If exponent is negative, 0 < input < 1, the result is 0.
-  // If exponent is greater than or equal to 84, the 32 less significant
-  // bits are 0s (2^84 = 1, 52 significant bits, 32 uncoded bits),
-  // the result is 0.
-  // This test also catch Nan and infinities which also return 0.
-  cmp(scratch, Operand(84));
-  // We do an unsigned comparison so negative numbers are treated as big
-  // positive number and the two tests above are done in one test.
-  b(hs, &out_of_range);
-
-  // Load scratch with 20 - exponent.
-  rsb(scratch, scratch, Operand(20), SetCC);
-  b(mi, &both);
-
-  // Test 0 and -0.
-  bic(result, input_high, Operand(HeapNumber::kSignMask));
-  orr(result, result, Operand(input_low), SetCC);
-  b(eq, &done);
-  // 0 <= exponent <= 20, shift only input_high.
-  // Scratch contains: 20 - exponent.
-  Ubfx(result, input_high,
-       0, HeapNumber::kMantissaBitsInTopWord);
-  // Set the implicit 1 before the mantissa part in input_high.
-  orr(result, result, Operand(1 << HeapNumber::kMantissaBitsInTopWord));
-  mov(result, Operand(result, LSR, scratch));
-  b(&negate);
-
-  bind(&both);
-  // Restore scratch to exponent - 1 to be consistent with ECMAToInt32VFP.
-  rsb(scratch, scratch, Operand(19));
-  ECMAToInt32Tail(result, scratch, input_high, input_low,
-                  &out_of_range, &negate, &done);
-}
-
-
 void MacroAssembler::ECMAToInt32Tail(Register result,
                                      Register scratch,
                                      Register input_high,
                                      Register input_low,
                                      Label* out_of_range,
                                      Label* negate,
                                      Label* done) {
   Label only_low;
 
   // On entry, scratch contains exponent - 1.
@@ skipping 82 matching lines @@
 
 void MacroAssembler::CallRuntime(Runtime::FunctionId fid, int num_arguments) {
   CallRuntime(Runtime::FunctionForId(fid), num_arguments);
 }
 
 
 void MacroAssembler::CallRuntimeSaveDoubles(Runtime::FunctionId id) {
   const Runtime::Function* function = Runtime::FunctionForId(id);
   mov(r0, Operand(function->nargs));
   mov(r1, Operand(ExternalReference(function, isolate())));
-  SaveFPRegsMode mode = CpuFeatures::IsSupported(VFP2)
-      ? kSaveFPRegs
-      : kDontSaveFPRegs;
-  CEntryStub stub(1, mode);
+  CEntryStub stub(1, kSaveFPRegs);
   CallStub(&stub);
 }
 
 
 void MacroAssembler::CallExternalReference(const ExternalReference& ext,
                                            int num_arguments) {
   mov(r0, Operand(num_arguments));
   mov(r1, Operand(ext));
 
   CEntryStub stub(1);
@@ skipping 724 matching lines @@
 }
 
 
 void MacroAssembler::PrepareCallCFunction(int num_reg_arguments,
                                           Register scratch) {
   PrepareCallCFunction(num_reg_arguments, 0, scratch);
 }
 
 
 void MacroAssembler::SetCallCDoubleArguments(DwVfpRegister dreg) {
-  ASSERT(CpuFeatures::IsSupported(VFP2));
   if (use_eabi_hardfloat()) {
     Move(d0, dreg);
   } else {
     vmov(r0, r1, dreg);
   }
 }
 
 
 void MacroAssembler::SetCallCDoubleArguments(DwVfpRegister dreg1,
                                              DwVfpRegister dreg2) {
-  ASSERT(CpuFeatures::IsSupported(VFP2));
   if (use_eabi_hardfloat()) {
     if (dreg2.is(d0)) {
       ASSERT(!dreg1.is(d1));
       Move(d1, dreg2);
       Move(d0, dreg1);
     } else {
       Move(d0, dreg1);
       Move(d1, dreg2);
     }
   } else {
     vmov(r0, r1, dreg1);
     vmov(r2, r3, dreg2);
   }
 }
 
 
 void MacroAssembler::SetCallCDoubleArguments(DwVfpRegister dreg,
                                              Register reg) {
-  ASSERT(CpuFeatures::IsSupported(VFP2));
   if (use_eabi_hardfloat()) {
     Move(d0, dreg);
     Move(r0, reg);
   } else {
     Move(r2, reg);
     vmov(r0, r1, dreg);
   }
 }
 
 
@@ skipping 442 matching lines @@
 void CodePatcher::EmitCondition(Condition cond) {
   Instr instr = Assembler::instr_at(masm_.pc_);
   instr = (instr & ~kCondMask) | cond;
   masm_.emit(instr);
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM