[turbofan] Add CalleeSavedFPRegisters to CallDescriptor.

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

Index: src/compiler/mips/code-generator-mips.cc
diff --git a/src/compiler/mips/code-generator-mips.cc b/src/compiler/mips/code-generator-mips.cc
index a49ec4e9f2f18352955d6d8ec12331049610be12..8bb47ef4f79e3fcc0196dd23e10b9d57f0df1850 100644
--- a/src/compiler/mips/code-generator-mips.cc
+++ b/src/compiler/mips/code-generator-mips.cc
@@ -1078,17 +1078,20 @@ void CodeGenerator::AssemblePrologue() {
   if (descriptor->kind() == CallDescriptor::kCallAddress) {
     __ Push(ra, fp);
     __ mov(fp, sp);
+
     const RegList saves = descriptor->CalleeSavedRegisters();
-    if (saves != 0) {  // Save callee-saved registers.
-      // TODO(plind): make callee save size const, possibly DCHECK it.
-      int register_save_area_size = 0;
-      for (int i = Register::kNumRegisters - 1; i >= 0; i--) {
-        if (!((1 << i) & saves)) continue;
-        register_save_area_size += kPointerSize;
-      }
-      frame()->SetRegisterSaveAreaSize(register_save_area_size);
-      __ MultiPush(saves);
-    }
+    // Save callee-saved registers.
+    __ MultiPush(saves);
+    DCHECK(kNumCalleeSaved == base::bits::CountPopulation32(saves));
+    int register_save_area_size = kNumCalleeSaved * kPointerSize;
+
+    const RegList saves_fpu = descriptor->CalleeSavedFPRegisters();
+    // Save callee-saved FPU registers.
+    __ MultiPushFPU(saves_fpu);
+    DCHECK(kNumCalleeSavedFPU == base::bits::CountPopulation32(saves_fpu));
+    register_save_area_size += kNumCalleeSavedFPU * kDoubleSize * kPointerSize;
+
+    frame()->SetRegisterSaveAreaSize(register_save_area_size);
   } else if (descriptor->IsJSFunctionCall()) {
     CompilationInfo* info = this->info();
     __ Prologue(info->IsCodePreAgingActive());
@@ -1131,11 +1134,13 @@ void CodeGenerator::AssembleReturn() {
       if (stack_slots > 0) {
         __ Addu(sp, sp, Operand(stack_slots * kPointerSize));
       }
-      // Restore registers.
+      // Restore FPU registers.
+      const RegList saves_fpu = descriptor->CalleeSavedFPRegisters();
+      __ MultiPopFPU(saves_fpu);
+
+      // Restore GP registers.
       const RegList saves = descriptor->CalleeSavedRegisters();
-      if (saves != 0) {
-        __ MultiPop(saves);
-      }
+      __ MultiPop(saves);
     }
     __ mov(sp, fp);
     __ Pop(ra, fp);