Handle non-power-of-2 divisors in division-like operations

src/arm/macro-assembler-arm.cc

Index: src/arm/macro-assembler-arm.cc
diff --git a/src/arm/macro-assembler-arm.cc b/src/arm/macro-assembler-arm.cc
index d705c90bd2edf62c953e2ea39449ada558b277e6..5ea6438a9fceb8aa0d4430422e92a3e889f56b85 100644
--- a/src/arm/macro-assembler-arm.cc
+++ b/src/arm/macro-assembler-arm.cc
@@ -4032,6 +4032,22 @@ void CodePatcher::EmitCondition(Condition cond) {
 }
 
 
+void MacroAssembler::FlooringDiv(Register result,
+                                 Register dividend,
+                                 int32_t divisor) {
+  ASSERT(!dividend.is(result));
+  ASSERT(!dividend.is(ip));
+  ASSERT(!result.is(ip));
+  MultiplierAndShift ms(divisor);
+  mov(ip, Operand(ms.multiplier()));
+  smull(result, ip, dividend, ip);
+  if (divisor > 0 && ms.multiplier() < 0) add(ip, ip, Operand(dividend));
+  if (divisor < 0 && ms.multiplier() > 0) sub(ip, ip, Operand(dividend));
+  if (ms.shift() > 0) mov(ip, Operand(ip, ASR, ms.shift()));
+  add(result, ip, Operand(dividend, LSR, 31));
+}
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM