Turbofan: Modify WASM linkage to store floats using only 4 bytes.

src/compiler/arm/code-generator-arm.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/arm/macro-assembler-arm.h"
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
@@ skipping 1186 matching lines @@
       // (a < b) ? a : b
       DwVfpRegister a = i.InputFloat64Register(0);
       DwVfpRegister b = i.InputFloat64Register(1);
       DwVfpRegister result = i.OutputFloat64Register(0);
       __ VFPCompareAndSetFlags(b, a);
       __ vsel(gt, result, a, b);
       break;
     }
     case kArmPush:
       if (instr->InputAt(0)->IsFPRegister()) {
-        __ vpush(i.InputDoubleRegister(0));
-        frame_access_state()->IncreaseSPDelta(kDoubleSize / kPointerSize);
+        LocationOperand* op = LocationOperand::cast(instr->InputAt(0));
+        if (op->representation() == MachineRepresentation::kFloat64) {
+          __ vpush(i.InputFloat64Register(0));
+          frame_access_state()->IncreaseSPDelta(kDoubleSize / kPointerSize);
+        } else {
+          DCHECK_EQ(MachineRepresentation::kFloat32, op->representation());
+          __ vpush(i.InputFloat32Register(0));
+          frame_access_state()->IncreaseSPDelta(1);
+        }
       } else {
         __ push(i.InputRegister(0));
         frame_access_state()->IncreaseSPDelta(1);
       }
       DCHECK_EQ(LeaveCC, i.OutputSBit());
       break;
     case kArmPoke: {
       int const slot = MiscField::decode(instr->opcode());
       __ str(i.InputRegister(0), MemOperand(sp, slot * kPointerSize));
       DCHECK_EQ(LeaveCC, i.OutputSBit());
@@ skipping 468 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8