MIPS: Implement unaligned access instruction.

src/mips64/constants-mips64.h

Index: src/mips64/constants-mips64.h
diff --git a/src/mips64/constants-mips64.h b/src/mips64/constants-mips64.h
index 0bb26a6960f1817044f0e37f6096b2978308a1fc..82724201d9fea0f4370dcb8cce8d58abe7b5a221 100644
--- a/src/mips64/constants-mips64.h
+++ b/src/mips64/constants-mips64.h
@@ -60,6 +60,27 @@ const bool IsMipsSoftFloatABI = true;
 const bool IsMipsSoftFloatABI = true;
 #endif
 
+#if defined(V8_TARGET_LITTLE_ENDIAN)
+const uint32_t kMipsLwrOffset = 0;
+const uint32_t kMipsLwlOffset = 3;
+const uint32_t kMipsSwrOffset = 0;
+const uint32_t kMipsSwlOffset = 3;
+const uint32_t kMipsLdrOffset = 0;
+const uint32_t kMipsLdlOffset = 7;
+const uint32_t kMipsSdrOffset = 0;
+const uint32_t kMipsSdlOffset = 7;
+#elif defined(V8_TARGET_BIG_ENDIAN)
+const uint32_t kMipsLwrOffset = 3;
+const uint32_t kMipsLwlOffset = 0;
+const uint32_t kMipsSwrOffset = 3;
+const uint32_t kMipsSwlOffset = 0;
+const uint32_t kMipsLdrOffset = 7;
+const uint32_t kMipsLdlOffset = 0;
+const uint32_t kMipsSdrOffset = 7;
+const uint32_t kMipsSdlOffset = 0;
+#else
+#error Unknown endianness
+#endif
 
 #ifndef __STDC_FORMAT_MACROS
 #define __STDC_FORMAT_MACROS
@@ -911,7 +932,6 @@ class Instruction {
 
   enum TypeChecks { NORMAL, EXTRA };
 
-
   static constexpr uint64_t kOpcodeImmediateTypeMask =
       OpcodeToBitNumber(REGIMM) | OpcodeToBitNumber(BEQ) |
       OpcodeToBitNumber(BNE) | OpcodeToBitNumber(BLEZ) |
@@ -926,12 +946,14 @@ class Instruction {
       OpcodeToBitNumber(POP76) | OpcodeToBitNumber(LB) | OpcodeToBitNumber(LH) |
       OpcodeToBitNumber(LWL) | OpcodeToBitNumber(LW) | OpcodeToBitNumber(LWU) |
       OpcodeToBitNumber(LD) | OpcodeToBitNumber(LBU) | OpcodeToBitNumber(LHU) |
-      OpcodeToBitNumber(LWR) | OpcodeToBitNumber(SB) | OpcodeToBitNumber(SH) |
+      OpcodeToBitNumber(LDL) | OpcodeToBitNumber(LDR) | OpcodeToBitNumber(LWR) |
+      OpcodeToBitNumber(SDL) | OpcodeToBitNumber(SB) | OpcodeToBitNumber(SH) |
       OpcodeToBitNumber(SWL) | OpcodeToBitNumber(SW) | OpcodeToBitNumber(SD) |
-      OpcodeToBitNumber(SWR) | OpcodeToBitNumber(LWC1) |
-      OpcodeToBitNumber(LDC1) | OpcodeToBitNumber(SWC1) |
-      OpcodeToBitNumber(SDC1) | OpcodeToBitNumber(PCREL) |
-      OpcodeToBitNumber(DAUI) | OpcodeToBitNumber(BC) | OpcodeToBitNumber(BALC);
+      OpcodeToBitNumber(SWR) | OpcodeToBitNumber(SDR) |
+      OpcodeToBitNumber(LWC1) | OpcodeToBitNumber(LDC1) |
+      OpcodeToBitNumber(SWC1) | OpcodeToBitNumber(SDC1) |
+      OpcodeToBitNumber(PCREL) | OpcodeToBitNumber(DAUI) |
+      OpcodeToBitNumber(BC) | OpcodeToBitNumber(BALC);
 
 #define FunctionFieldToBitNumber(function) (1ULL << function)