Low frequency blocks previously moved to the end of the block chain are now being left inline.

Run specjbb2005 on Sparc:

java -server -XX:+AggressiveOpts -XX:+UseParallelOldGC -XX:+UseLargePages -XX:ParallelGCThreads=6 -Xmx3g -Xms3g -Xmn2g -Xss96k -Xbootclasspath/p:/export/home/kvn/:jbb.jar:check.jar spec.jbb.JBBmain

In compilation for java/lang/String.<init>, for example, notice low frequency blocks B5 and B6 in-line with their high frequency neighbors.

000 N134: # B1 &lt;- BLOCK HEAD IS JUNK Freq: 10006
000
UEP:
LDUW [R_O0 + oopDesc::klass_offset_in_bytes],R_G5 ! Inline cache check
CMP R_G5,R_G3
Tne icc,R_G0+ST_RESERVED_FOR_USER_0+2
000
00c B1: # B11 B2 &lt;- BLOCK HEAD IS JUNK Freq: 10006
00c ! stack bang
SAVE R_SP,-104,R_SP
018 LDUW [R_I1 + #8],R_L3 ! range
01c NullCheck R_I1
01c
01c B2: # B5 B3 &lt;- B1 Freq: 10006
01c + SLL R_L3,#1,R_L0
020 + ADD R_L0,#19,R_L2
024 SET #524288,R_L1
028 + AND R_L2,#-8,R_L0
02c STW R_L3,[R_I0 + #16] ! Field java/lang/String.count
030 + CMP R_L3,R_L1 ! unsigned
034 BPugt icc_U,B5 P=0.000001 C=-1.000000
034 STW #0,[R_I0 + #12] ! Field java/lang/String.offset
034
03c B3: # B5 B4 &lt;- B2 Freq: 10006
03c + # TLS is in G2
03c + LDUW [R_G2 + #72],R_L6 ! ptr
040 + LDUW [R_G2 + #80],R_L2 ! ptr
044 + ADD R_L6,R_L0,R_L1
048 + CMP R_L1,R_L2 ! ptr
04c BPpge icc_P,B5 P=0.000100 C=-1.000000
04c
054 B4: # B7 &lt;- B3 Freq: 10005
054 + SET 0x00000001,R_L2 !ptr
058 + SET precise klass [C: 0x000d7b08:Constant:exact *,R_L4 !ptr
060 + STW R_L1,[R_G2 + #72] ! ptr
064 + STW R_L2,[R_L6] ! ptr
068 + PREFETCH [R_L1 + #512],2 ! Prefetch write-many (and read)
06c + STW R_L4,[R_L6 + #4] ! ptr
070 + PREFETCH [R_L1 + #576],2 ! Prefetch write-many (and read)
074 + STW R_L3,[R_L6 + #8]
078 + BA B7
078 PREFETCH [R_L1 + #640],2 ! Prefetch write-many (and read)
078
080 B5: # B10 B6 &lt;- B2 B3 Freq: 1.0109
080 + SET precise klass [C: 0x000d7b08:Constant:exact *,R_O0 !ptr
088 + MOV R_L3,R_O1 ! spill
08c CALL,static ; NOP ==&gt; wrapper for: _new_array_Java
        # java.util.Arrays::copyOf @ bci:1 L[0]=R_I1 L[1]=R_L3 L[2]=_
        # java.lang.String::&lt;init&gt; @ bci:20 L[0]=_ L[1]=_ L[2]=_ STK[0]=R_I0
        # I0=Oop I1=Oop
094
094 B6: # B7 &lt;- B5 Freq: 1.01088
        # Block is sole successor of call
094 + MOV R_O0,R_L6 ! spill
094
098 B7: # B9 B8 &lt;- B6 B4 Freq: 10006
098
098 + CMP R_L3,#0
09c BPle ccr,B9 P=0.000001 C=-1.000000
09c
0a4 B8: # B9 &lt;- B7 Freq: 10006
0a4 + LDUW [R_I1 + #12],R_L1
0a8 ADD R_L0,#-16,R_L2
0ac + STW R_L1,[R_L6 + #12]
0b0 SRL R_L2,#3,R_O2
0b4 ADD R_L6,#16,R_O1
0b8 + ADD R_I1,#16,R_O0
0bc CALL,runtime leaf nofp jlong_disjoint_arraycopy
        No JVM State Info
        #
0c8
0c8 B9: # N134 &lt;- B8 B7 Freq: 10006
0c8 + SET 0x35a4e000,R_L0 !ptr
0cc
0cc + # checkcastPP of R_L6
0cc
0cc + SRL R_I0,#9,R_L2 ! Cast ptr R_I0 to int and shift
0d0 STW R_L6,[R_I0 + #8] ! ptr ! Field java/lang/String.value
0d4 + STB #0,[R_L0 + R_L2] ! byte
0d8 + MEMBAR-release
0d8 + SETHI #PollAddr,L0 ! Load Polling address
LDUW [L0],G0 !Poll for Safepointing
RET
RESTORE
0e8 + ! return
0e8
0e8 B10: # N134 &lt;- B5 Freq: 1.0109e-05
0e8 ! exception oop is in R_O0; no code emitted
0e8 + MOV R_O0,R_I0 ! spill
0ec + RESTORE
0f0 + Jmp rethrow_stub
0f0
114 B11: # N134 &lt;- B1 Freq: 1e-06
114 + MOV #-10,R_O0
118 CALL,static ; NOP ==&gt; wrapper for: uncommon_trap(reason=&apos;null_check&apos; action=&apos;maybe_recompile&apos;)
        # java.lang.String::&lt;init&gt; @ bci:5 L[0]=_ L[1]=_ L[2]=_ STK[0]=R_I1
        # I1=Oop
120 ILLTRAP ; ShouldNotReachHere
120