Bisection shows this starts to happen after JDK-8223051. There are many tests failing in tier1. I wonder if 32-bit code dislikes loops with *L nodes now.

Here is the example failure:

$ CONF=linux-x86-server-fastdebug make clean images run-test TEST=compiler/c2/TestMatcherLargeOffset.java

STDOUT:
o866  Binary  === _ o579 o578  [[o580 ]] 

--N: o866  Binary  === _ o579 o578  [[o580 ]] 

   --N: o579  Bool  === _ o578  [[o866 ]] [gt]
   CMPOP  0  CMPOP
   CMPOPU  0  CMPOPU
   CMPOPUCF  0  CMPOPUCF
   CMPOP_FCMOV  0  CMPOP_FCMOV
   CMPOP_COMMUTE  0  CMPOP_COMMUTE
   CMPOPU_COMMUTE  0  CMPOPU_COMMUTE
   CMPOP_VCMPPD  0  CMPOP_VCMPPD

   --N: o578  CmpUL  === _ o574 o575  [[o579 o866 ]] 
   FLAGSREG_ULONG_LTGE  500  cmpUL_reg_flags_LTGE
   FLAGSREG_ULONG_EQNE  700  cmpUL_reg_flags_EQNE
   FLAGSREG_ULONG_LEGT  500  cmpUL_reg_flags_LEGT

      --N: o574  CMoveL  === _ o864 o865  [[o578 o867 ]]  #long
      EREGL  0  EREGL
      EADXREGL  0  EADXREGL
      EBCXREGL  0  EBCXREGL
      EADXREGL_LOW_ONLY  0  EADXREGL_LOW_ONLY
      STACKSLOTL  200  storeSSL

      --N: o575  ConL  === o0  [[o578 o867 ]]  #long:maxint-2
      IMML  20  IMML
      IMML32  20  IMML32
      EREGL  200  loadConL
      EADXREGL  200  loadConL
      EBCXREGL  200  loadConL
      EADXREGL_LOW_ONLY  270  loadConL_low_only
      STACKSLOTL  400  storeSSL

# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc:  SuppressErrorAt=/matcher.cpp:1653
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error (/home/shade/trunks/jdk/src/hotspot/share/opto/matcher.cpp:1653), pid=714120, tid=714135
#  assert(false) failed: bad AD file