S390: Enable unaligned accesses and character preloading in regexp.

src/s390/macro-assembler-s390.cc

Index: src/s390/macro-assembler-s390.cc
diff --git a/src/s390/macro-assembler-s390.cc b/src/s390/macro-assembler-s390.cc
index bf3210738912be4ee6590c510fedd87fe56f3de7..ab264277254734fcd2b4a0994516d4416a2298e4 100644
--- a/src/s390/macro-assembler-s390.cc
+++ b/src/s390/macro-assembler-s390.cc
@@ -5071,6 +5071,22 @@ void MacroAssembler::LoadlW(Register dst, const MemOperand& mem,
 #endif
 }
 
+void MacroAssembler::LoadLogicalHalfWordP(Register dst, const MemOperand& mem) {
+#if V8_TARGET_ARCH_S390X
+  llgh(dst, mem);
+#else
+  llh(dst, mem);
+#endif
+}
+
+void MacroAssembler::LoadLogicalHalfWordP(Register dst, Register src) {
+#if V8_TARGET_ARCH_S390X
+  llghr(dst, src);
+#else
+  llhr(dst, src);
+#endif
+}
+
 void MacroAssembler::LoadB(Register dst, const MemOperand& mem) {
 #if V8_TARGET_ARCH_S390X
   lgb(dst, mem);
@@ -5095,6 +5111,19 @@ void MacroAssembler::LoadlB(Register dst, const MemOperand& mem) {
 #endif
 }
 
+void MacroAssembler::LoadReversedWordP(Register dst, const MemOperand& mem) {

[JoranSiu, 2016/06/16 21:05:16]

Should these be better named as LoadLogicalReversedWordP?  (if we end up doing a
zero-extension).

+  lrv(dst, mem);
+  LoadlW(dst, dst);
+}
+
+
+void MacroAssembler::LoadReversedHalfWordP(Register dst,
+                                           const MemOperand& mem) {
+  lrvh(dst, mem);
+  LoadLogicalHalfWordP(dst, dst);
+}
+
+
 // Load And Test (Reg <- Reg)
 void MacroAssembler::LoadAndTest32(Register dst, Register src) {
   ltr(dst, src);