MIPS: Fix stack claim and store to slot for large sizes.

Could not encode the large slot number in opcode MiscField.

TEST=mozilla/js/tests/js1_5/Regress/regress-396684.js
BUG=

Review URL: https://codereview.chromium.org/1043393002

Cr-Commit-Position: refs/heads/master@{#27574}

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

@@ -721,13 +721,11 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       __ Push(i.InputRegister(0));
       break;
     case kMipsStackClaim: {
-      int words = MiscField::decode(instr->opcode());
-      __ Subu(sp, sp, Operand(words << kPointerSizeLog2));
+      __ Subu(sp, sp, Operand(i.InputInt32(0)));
       break;
     }
     case kMipsStoreToStackSlot: {
-      int slot = MiscField::decode(instr->opcode());
-      __ sw(i.InputRegister(0), MemOperand(sp, slot << kPointerSizeLog2));
+      __ sw(i.InputRegister(0), MemOperand(sp, i.InputInt32(1)));
       break;
     }
     case kMipsStoreWriteBarrier: {

src/compiler/mips/instruction-selector-mips.cc

@@ -505,13 +505,14 @@ void InstructionSelector::VisitCall(Node* node, BasicBlock* handler) {
   // Possibly align stack here for functions.
   int push_count = buffer.pushed_nodes.size();
   if (push_count > 0) {
-    Emit(kMipsStackClaim | MiscField::encode(push_count), g.NoOutput());
+    Emit(kMipsStackClaim, g.NoOutput(),
+         g.TempImmediate(push_count << kPointerSizeLog2));
   }
   int slot = buffer.pushed_nodes.size() - 1;
   for (auto i = buffer.pushed_nodes.rbegin(); i != buffer.pushed_nodes.rend();
        ++i) {
-    Emit(kMipsStoreToStackSlot | MiscField::encode(slot), g.NoOutput(),
-         g.UseRegister(*i));
+    Emit(kMipsStoreToStackSlot, g.NoOutput(), g.UseRegister(*i),
+         g.TempImmediate(slot << kPointerSizeLog2));
     slot--;
   }
 

src/compiler/mips64/code-generator-mips64.cc

@@ -789,13 +789,11 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       __ Push(i.InputRegister(0));
       break;
     case kMips64StackClaim: {
-      int words = MiscField::decode(instr->opcode());
-      __ Dsubu(sp, sp, Operand(words << kPointerSizeLog2));
+      __ Dsubu(sp, sp, Operand(i.InputInt32(0)));
       break;
     }
     case kMips64StoreToStackSlot: {
-      int slot = MiscField::decode(instr->opcode());
-      __ sd(i.InputRegister(0), MemOperand(sp, slot << kPointerSizeLog2));
+      __ sd(i.InputRegister(0), MemOperand(sp, i.InputInt32(1)));
       break;
     }
     case kMips64StoreWriteBarrier: {

src/compiler/mips64/instruction-selector-mips64.cc

@@ -654,13 +654,14 @@ void InstructionSelector::VisitCall(Node* node, BasicBlock* handler) {
 
   int push_count = buffer.pushed_nodes.size();
   if (push_count > 0) {
-    Emit(kMips64StackClaim | MiscField::encode(push_count), g.NoOutput());
+    Emit(kMips64StackClaim, g.NoOutput(),
+         g.TempImmediate(push_count << kPointerSizeLog2));
   }
   int slot = buffer.pushed_nodes.size() - 1;
   for (auto i = buffer.pushed_nodes.rbegin(); i != buffer.pushed_nodes.rend();
        ++i) {
-    Emit(kMips64StoreToStackSlot | MiscField::encode(slot), g.NoOutput(),
-         g.UseRegister(*i));
+    Emit(kMips64StoreToStackSlot, g.NoOutput(), g.UseRegister(*i),
+         g.TempImmediate(slot << kPointerSizeLog2));
     slot--;
   }