A DESCRIPTION OF THE REQUEST :
Different isXyz() methods often compare on same boundary. If
consecutive, after HotSpot inlining one of those compares could be saved.


JUSTIFICATION :
- performance
- memory usage


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -

  0x00b86587: cmp $0xd800,%ecx
  0x00b8658d: jl 0x00b865a6
  0x00b8658f: cmp $0xdc00,%ecx
  0x00b86595: jl 0x00b865aa ;*if_icmplt
                                        ; -
java.lang.Character::isHighSurrogate@3 (line 2795)
                                        ; -
java.lang.Benchmark::isSurrogate@1 (line 7)
  0x00b86597: cmp $0xe000,%ecx
  0x00b8659d: jge 0x00b865a6 ;*if_icmpge
                                        ; -
java.lang.Character::isLowSurrogate@9 (line 2819)
                                        ; -
java.lang.Benchmark::isSurrogate@13 (line 9)
  0x00b8659f: mov $0x1,%eax
  0x00b865a4: jmp 0x00b865af ;*if_icmplt
                                        ; -
java.lang.Character::isLowSurrogate@3 (line 2819)
                                        ; -
java.lang.Benchmark::isSurrogate@13 (line 9)
  0x00b865a6: xor %eax,%eax
  0x00b865a8: jmp 0x00b865af
  0x00b865aa: mov $0x2,%eax ;*goto
                                        ; -
java.lang.Benchmark::isSurrogate@21 (line 10)
  0x00b865af: add $0x8,%esp
  0x00b865b2: pop %ebp
  0x00b865b3: test %eax,0x390000 ; {poll_return}
  0x00b865b9: ret

ACTUAL -

  0x00b86587: cmp $0xd800,%ecx
  0x00b8658d: jl 0x00b86597
  0x00b8658f: cmp $0xdc00,%ecx
  0x00b86595: jl 0x00b865b2 ;*if_icmplt
                                        ; -
java.lang.Character::isHighSurrogate@3 (line 2795)
                                        ; -
java.lang.Benchmark::isSurrogate@1 (line 7)
  0x00b86597: cmp $0xdc00,%ecx
  0x00b8659d: jl 0x00b865ae ;*if_icmplt
                                        ; -
java.lang.Character::isLowSurrogate@3 (line 2819)
                                        ; -
java.lang.Benchmark::isSurrogate@13 (line 9)
  0x00b8659f: cmp $0xe000,%ecx
  0x00b865a5: jge 0x00b865ae ;*if_icmpge
                                        ; -
java.lang.Character::isLowSurrogate@9 (line 2819)
                                        ; -
java.lang.Benchmark::isSurrogate@13 (line 9)
  0x00b865a7: mov $0x1,%eax
  0x00b865ac: jmp 0x00b865b7 ;*if_icmplt
                                        ; -
java.lang.Character::isLowSurrogate@3 (line 2819)
                                        ; -
java.lang.Benchmark::isSurrogate@13 (line 9)
  0x00b865ae: xor %eax,%eax
  0x00b865b0: jmp 0x00b865b7
  0x00b865b2: mov $0x2,%eax ;*goto
                                        ; -
java.lang.Benchmark::isSurrogate@21 (line 10)
  0x00b865b7: add $0x8,%esp
  0x00b865ba: pop %ebp
  0x00b865bb: test %eax,0x390000 ; {poll_return}
  0x00b865c1: ret


---------- BEGIN SOURCE ----------

        int n;
        if (Character.isHighSurrogate(c))
            n = 2;
        else if (Character.isLowSurrogate(c))
            n = 1;
        else
            n = 0;


---------- END SOURCE ----------