MIPS:[turbofan] Improve boolean materialization compares.

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 c2420ac0d816cc3b7688658cb79c0bb207b3ec9e..9dac03725e9cc9420508d46c35997ed41a8931b8 100644
--- a/src/compiler/mips/instruction-selector-mips.cc
+++ b/src/compiler/mips/instruction-selector-mips.cc
@@ -775,7 +775,6 @@ static void VisitCompare(InstructionSelector* selector, InstructionCode opcode,
                    g.Label(cont->true_block()), g.Label(cont->false_block()));
   } else {
     DCHECK(cont->IsSet());
-    // TODO(plind): Revisit and test this path.
     selector->Emit(opcode, g.DefineAsRegister(cont->result()), left, right);
   }
 }
@@ -813,12 +812,32 @@ void VisitWordCompare(InstructionSelector* selector, Node* node,
 
   // Match immediates on left or right side of comparison.
   if (g.CanBeImmediate(right, opcode)) {
-    VisitCompare(selector, opcode, g.UseRegister(left), g.UseImmediate(right),
-                 cont);
+    switch (cont->condition()) {
+      case kSignedLessThan:
+      case kSignedGreaterThanOrEqual:
+      case kUnsignedLessThan:
+      case kUnsignedGreaterThanOrEqual:
+        VisitCompare(selector, opcode, g.UseRegister(left),
+                     g.UseImmediate(right), cont);
+        break;
+      default:
+        VisitCompare(selector, opcode, g.UseRegister(left),
+                     g.UseRegister(right), cont);
+    }
   } else if (g.CanBeImmediate(left, opcode)) {
     if (!commutative) cont->Commute();
-    VisitCompare(selector, opcode, g.UseRegister(right), g.UseImmediate(left),
-                 cont);
+    switch (cont->condition()) {
+      case kSignedLessThan:
+      case kSignedGreaterThanOrEqual:
+      case kUnsignedLessThan:
+      case kUnsignedGreaterThanOrEqual:
+        VisitCompare(selector, opcode, g.UseRegister(right),
+                     g.UseImmediate(left), cont);
+        break;
+      default:
+        VisitCompare(selector, opcode, g.UseRegister(right),
+                     g.UseRegister(left), cont);
+    }
   } else {
     VisitCompare(selector, opcode, g.UseRegister(left), g.UseRegister(right),
                  cont);