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