jdk8-mips64-public/hotspot: changeset 89:179d203c9b2b

#4428: Use gsdmult to optimize the lmul template of the interpreter.
I have run the test program on 3A2000 computer

Effects:
[loongson@localhost project]$ ./LmulTest.sh
before
time:3225ms
after
time:3115ms

The test java program:
public class LmulTest{
public static void main(String args[]){
int count = 10000000;
long startTime = System.currentTimeMillis();
//long startTime = System.nanoTime();
for(int i = 0; i < count; i++){
long a, b, c;
a = 12345678;
a++;
b = 87654321;
b++;
c = a * b;
//System.out.println(c);
}
long endTime = System.currentTimeMillis();
//long endTime = System.nanoTime();
System.out.println("time:" + (endTime - startTime) + "ms");
}
}

     1.1 --- a/src/cpu/mips/vm/templateTable_mips_64.cpp	Fri Aug 26 20:31:57 2016 +0800
     1.2 +++ b/src/cpu/mips/vm/templateTable_mips_64.cpp	Thu Aug 25 22:31:58 2016 +0800
     1.3 @@ -1302,39 +1302,16 @@
     1.4  	__ mfhi(FSR);
     1.5  }
     1.6  
     1.7 -// the multiplier in SSR||FSR, the multiplicand in stack
     1.8 -// the result in SSR||FSR
     1.9 -// used registers : T2, T3
    1.10  void TemplateTable::lmul() {
    1.11    transition(ltos, ltos);
    1.12 -  Label done;
    1.13 -
    1.14 -  __ pop_l(T2, T3);
    1.15 -#ifdef ASSERT
    1.16 -  {
    1.17 -    Label  L;
    1.18 -    __ orr(AT, T3, SSR);
    1.19 -    __ beq(AT, R0, L);
    1.20 -    __ delayed()->nop();
    1.21 -    //FIXME, aoqi
    1.22 -    //__ stop("lmul, wrong stack");
    1.23 -    __ bind(L);
    1.24 -  }
    1.25 -#endif
    1.26 -  __ orr(AT, T2, FSR);
    1.27 -  __ beq(AT, R0, done);
    1.28 -  __ delayed()->nop();
    1.29 -
    1.30 -  __ dmultu(T2, FSR);
    1.31 -  __ daddu(SSR, SSR, T3);
    1.32 -  __ nop();
    1.33 -  __ mflo(FSR);
    1.34 -  __ mfhi(SSR);
    1.35 -  __ b(done);
    1.36 -  __ delayed()->nop();
    1.37 -
    1.38 -  __ bind(done);
    1.39 -}
    1.40 +  __ pop_l(T2);
    1.41 +  if(UseLoongsonISA){
    1.42 +    __ gsdmult(FSR, T2, FSR);
    1.43 +  } else {
    1.44 +      __ dmult(T2, FSR);
    1.45 +      __ mflo(FSR);
    1.46 +  } 
    1.47 +} 
    1.48  
    1.49  // NOTE: i DONT use the Interpreter::_throw_ArithmeticException_entry
    1.50  void TemplateTable::ldiv() {

Mercurial > jdk8-mips64-public > hotspot / changeset

changeset

#4428: Use gsdmult to optimize the lmul template of the interpreter.