s390: use new mul instruction

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 3346 matching lines @@
   }
 }
 
 void MacroAssembler::Mul64(Register dst, Register src1) { msgr(dst, src1); }
 
 void MacroAssembler::Mul64(Register dst, const Operand& src1) {
   msgfi(dst, src1);
 }
 
 void MacroAssembler::Mul(Register dst, Register src1, Register src2) {
-  if (dst.is(src2)) {
-    MulP(dst, src1);
-  } else if (dst.is(src1)) {
-    MulP(dst, src2);
+  if (CpuFeatures::IsSupported(MISC_INSTR_EXT2)) {
+    MulPWithCondition(dst, src1, src2);
   } else {
-    Move(dst, src1);
-    MulP(dst, src2);
+    if (dst.is(src2)) {
+      MulP(dst, src1);
+    } else if (dst.is(src1)) {
+      MulP(dst, src2);
+    } else {
+      Move(dst, src1);
+      MulP(dst, src2);
+    }
   }
 }
 
 void MacroAssembler::DivP(Register dividend, Register divider) {
   // have to make sure the src and dst are reg pairs
   DCHECK(dividend.code() % 2 == 0);
 #if V8_TARGET_ARCH_S390X
   dsgr(dividend, divider);
 #else
   dr(dividend, divider);
@@ skipping 111 matching lines @@
 }
 
 void MacroAssembler::MulP(Register dst, Register src) {
 #if V8_TARGET_ARCH_S390X
   msgr(dst, src);
 #else
   msr(dst, src);
 #endif
 }
 
+void MacroAssembler::MulPWithCondition(Register dst, Register src1,
+                                       Register src2) {
+  CHECK(CpuFeatures::IsSupported(MISC_INSTR_EXT2));
+#if V8_TARGET_ARCH_S390X
+  msgrkc(dst, src1, src2);
+#else
+  msrkc(dst, src1, src2);
+#endif
+}
+
 void MacroAssembler::MulP(Register dst, const MemOperand& opnd) {
 #if V8_TARGET_ARCH_S390X
   if (is_uint16(opnd.offset())) {
     ms(dst, opnd);
   } else if (is_int20(opnd.offset())) {
     msy(dst, opnd);
   } else {
     UNIMPLEMENTED();
   }
 #else
@@ skipping 1837 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