Fix Arm32.

Author: Andrew Haley

src/hotspot/cpu/arm/c1_FrameMap_arm.cpp

@@ -48,6 +48,7 @@ LIR_Opr FrameMap::R3_metadata_opr;
 LIR_Opr FrameMap::R4_metadata_opr;
 LIR_Opr FrameMap::R5_metadata_opr;
 
+LIR_Opr FrameMap::profile_rng_opr;
 
 LIR_Opr FrameMap::LR_opr;
 LIR_Opr FrameMap::LR_oop_opr;
@@ -142,6 +143,10 @@ void FrameMap::initialize() {
   SP_opr      = as_pointer_opr(SP);
   Rthread_opr = as_pointer_opr(Rthread);
 
+  if (ProfileCaptureRatio > 1) {
+    profile_rng_opr = LIR_OprFact::single_cpu(cpu_reg2rnr(r_profile_rng));
+  }
+
   // LIR operands for result
   Int_result_opr = R0_opr;
   Object_result_opr = R0_oop_opr;

src/hotspot/cpu/arm/c1_FrameMap_arm.hpp

@@ -54,6 +54,7 @@
   static LIR_Opr R4_metadata_opr;
   static LIR_Opr R5_metadata_opr;
 
+  static LIR_Opr profile_rng_opr;
 
   static LIR_Opr LR_opr;
   static LIR_Opr LR_oop_opr;

src/hotspot/cpu/arm/c1_LIRAssembler_arm.cpp

@@ -2473,14 +2473,13 @@ void LIR_Assembler::increment_profile_ctr(LIR_Opr step, LIR_Opr dest_opr,
   }
 #endif
 
-  int profile_capture_ratio = ProfileCaptureRatio;
-  int ratio_shift = exact_log2(profile_capture_ratio);
+  int ratio_shift = exact_log2(ProfileCaptureRatio);
   uint64_t threshold = (UCONST64(1) << 32) >> ratio_shift;
 
   assert(threshold > 0, "must be");
 
   ProfileStub *counter_stub
-    = profile_capture_ratio > 1 ? new ProfileStub() : nullptr;
+    = ProfileCaptureRatio > 1 ? new ProfileStub() : nullptr;
 
   Register dest = dest_opr->as_register();
 
@@ -2544,7 +2543,7 @@ void LIR_Assembler::increment_profile_ctr(LIR_Opr step, LIR_Opr dest_opr,
       }
     }
 
-    if (overflow_stub) {
+    if (overflow_stub != nullptr) {
       guarantee(step->is_valid(), "must be");
       if (!freq_opr->is_valid()) {
         if (!step->is_constant()) {
@@ -2562,9 +2561,16 @@ void LIR_Assembler::increment_profile_ctr(LIR_Opr step, LIR_Opr dest_opr,
         }
         juint mask = freq_opr->as_jint();
         __ mov_slow(Rtemp, mask);
-        __ tst(dest, Rtemp);
-        __ b(*overflow_stub->entry(), eq);
+        __ andr(dest, dest, Rtemp);
+
+        if (step->is_register()) {
+          __ cmp(dest, AsmOperand(step->as_register(), lsl, ratio_shift));
+        } else {
+          __ mov(Rtemp, step->as_constant_ptr()->as_jint_bits() << ratio_shift);
+          __ cmp(dest, Rtemp);
+        }
       }
+      __ b(*overflow_stub->entry(), lo);
     }
 
     if (counter_stub != nullptr) {

src/hotspot/cpu/arm/c1_LIRGenerator_arm.cpp

@@ -93,6 +93,10 @@ LIR_Opr LIRGenerator::atomicLockOpr() {
   return LIR_OprFact::illegalOpr;
 }
 
+LIR_Opr LIRGenerator::profile_rng_opr() {
+  return FrameMap::profile_rng_opr;
+}
+
 LIR_Opr LIRGenerator::result_register_for(ValueType* type, bool callee) {
   LIR_Opr opr;
   switch (type->tag()) {

src/hotspot/cpu/arm/c1_MacroAssembler_arm.cpp

@@ -252,6 +252,7 @@ void C1_MacroAssembler::step_random(Register state, Register temp, Register data
      https://www.researchgate.net/publication/2683298_A_Collection_of_Selected_Pseudorandom_Number_Generators_With_Linear_Structures */
   mov_slow(temp, 69069);
   mul(state, state, temp);
+  add(state, state, 1);
 }
 
 void C1_MacroAssembler::save_profile_rng() {