MIPS: Improve pushing arguments on stack.

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

Index: src/compiler/mips/instruction-selector-mips.cc
diff --git a/src/compiler/mips/instruction-selector-mips.cc b/src/compiler/mips/instruction-selector-mips.cc
index afa56da5a7424a0b366233aaac5def84087a9e4a..0d2d96794db1ebacdb581e750d05267bd42bc7dc 100644
--- a/src/compiler/mips/instruction-selector-mips.cc
+++ b/src/compiler/mips/instruction-selector-mips.cc
@@ -446,15 +446,17 @@ void InstructionSelector::VisitCall(Node* node) {
 
   // Compute InstructionOperands for inputs and outputs.
   InitializeCallBuffer(node, &buffer, true, false);
-
-  // TODO(dcarney): might be possible to use claim/poke instead
-  // Push any stack arguments.
+  // Possibly align stack here for functions.
+  int push_count = buffer.pushed_nodes.size();
+  if (push_count > 0) {
+    Emit(kMipsStackClaim | MiscField::encode(push_count), NULL);
+  }
+  int slot = buffer.pushed_nodes.size() - 1;
   for (NodeVectorRIter input = buffer.pushed_nodes.rbegin();
        input != buffer.pushed_nodes.rend(); input++) {
-    // TODO(plind): inefficient for MIPS, use MultiPush here.
-    //    - Also need to align the stack. See arm64.
-    //    - Maybe combine with arg slot stuff in DirectCEntry stub.
-    Emit(kMipsPush, NULL, g.UseRegister(*input));
+    Emit(kMipsStoreToStackSlot | MiscField::encode(slot), NULL,
+         g.UseRegister(*input));
+    slot--;
   }
 
   // Select the appropriate opcode based on the call type.