MIPS[64]: Optimize Neg_s and Neg_d macro instructions.

The CL adds optimizations for Neg_s and Neg_d macro instructions.

BUG=

Change-Id: I842480ac3195860a1a36dadcffb5dc560ca8f424
Reviewed-on: https://chromium-review.googlesource.com/555131Reviewed-by: Ivica Bogosavljevic <ivica.bogosavljevic@imgtec.com>
Commit-Queue: Miran Karić <Miran.Karic@imgtec.com>
Cr-Commit-Position: refs/heads/master@{#46340}

src/mips/macro-assembler-mips.cc

@@ -1861,11 +1861,9 @@ void MacroAssembler::Neg_s(FPURegister fd, FPURegister fs) {
     neg_s(fd, fs);  // In delay slot.
     bind(&is_nan);
     mfc1(scratch1, fs);
-    And(scratch2, scratch1, Operand(~kBinary32SignMask));
-    And(scratch1, scratch1, Operand(kBinary32SignMask));
-    Xor(scratch1, scratch1, Operand(kBinary32SignMask));
-    Or(scratch2, scratch2, scratch1);
-    mtc1(scratch2, fd);
+    li(scratch2, kBinary32SignMask);
+    Xor(scratch1, scratch1, scratch2);
+    mtc1(scratch1, fd);
     bind(&done);
   }
 }
@@ -1887,11 +1885,9 @@ void MacroAssembler::Neg_d(FPURegister fd, FPURegister fs) {
     neg_d(fd, fs);  // In delay slot.
     bind(&is_nan);
     Mfhc1(scratch1, fs);
-    And(scratch2, scratch1, Operand(~HeapNumber::kSignMask));
-    And(scratch1, scratch1, Operand(HeapNumber::kSignMask));
-    Xor(scratch1, scratch1, Operand(HeapNumber::kSignMask));
-    Or(scratch2, scratch2, scratch1);
-    Mthc1(scratch2, fd);
+    li(scratch2, HeapNumber::kSignMask);
+    Xor(scratch1, scratch1, scratch2);
+    Mthc1(scratch1, fd);
     bind(&done);
   }
 }

src/mips64/macro-assembler-mips64.cc

@@ -2239,11 +2239,9 @@ void MacroAssembler::Neg_s(FPURegister fd, FPURegister fs) {
     neg_s(fd, fs);  // In delay slot.
     bind(&is_nan);
     mfc1(scratch1, fs);
-    And(scratch2, scratch1, Operand(~kBinary32SignMask));
-    And(scratch1, scratch1, Operand(kBinary32SignMask));
-    Xor(scratch1, scratch1, Operand(kBinary32SignMask));
-    Or(scratch2, scratch2, scratch1);
-    mtc1(scratch2, fd);
+    li(scratch2, kBinary32SignMask);
+    Xor(scratch1, scratch1, scratch2);
+    mtc1(scratch1, fd);
     bind(&done);
   }
 }
@@ -2264,11 +2262,9 @@ void MacroAssembler::Neg_d(FPURegister fd, FPURegister fs) {
     neg_d(fd, fs);  // In delay slot.
     bind(&is_nan);
     dmfc1(scratch1, fs);
-    And(scratch2, scratch1, Operand(~Double::kSignMask));
-    And(scratch1, scratch1, Operand(Double::kSignMask));
-    Xor(scratch1, scratch1, Operand(Double::kSignMask));
-    Or(scratch2, scratch2, scratch1);
-    dmtc1(scratch2, fd);
+    li(scratch2, Double::kSignMask);
+    Xor(scratch1, scratch1, scratch2);
+    dmtc1(scratch1, fd);
     bind(&done);
   }
 }