S390: Enable unaligned accesses and character preloading in regexp.

src/s390/macro-assembler-s390.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <assert.h>  // For assert
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_S390
 
 #include "src/base/bits.h"
@@ skipping 5053 matching lines @@
   if (use_RXform) {
     l(dst, mem);
   } else if (use_RXYform) {
     ly(dst, mem);
   } else {
     ly(dst, MemOperand(base, scratch));
   }
 #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);
 #else
   lb(dst, mem);
 #endif
 }
 
 void MacroAssembler::LoadB(Register dst, Register src) {
 #if V8_TARGET_ARCH_S390X
   lgbr(dst, src);
 #else
   lbr(dst, src);
 #endif
 }
 
 void MacroAssembler::LoadlB(Register dst, const MemOperand& mem) {
 #if V8_TARGET_ARCH_S390X
   llgc(dst, mem);
 #else
   llc(dst, 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);
 }
 
 // Load And Test
 //     (Register dst(ptr) = Register src (32 | 32->64))
 // src is treated as a 32-bit signed integer, which is sign extended to
 // 64-bit if necessary.
 void MacroAssembler::LoadAndTestP_ExtendSrc(Register dst, Register src) {
@@ skipping 418 matching lines @@
   }
   if (mag.shift > 0) ShiftRightArith(result, result, Operand(mag.shift));
   ExtractBit(r0, dividend, 31);
   AddP(result, r0);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_S390