JDK-8185013 : Disable subword vector analysis optimization until 8184995 is fixed
  • Type: Sub-task
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 10
  • Priority: P2
  • Status: Resolved
  • Resolution: Fixed
  • OS: generic
  • CPU: x86
  • Submitted: 2017-07-20
  • Updated: 2018-03-03
  • Resolved: 2017-07-21
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JDK 10
10 b21Fixed
Related Reports
Relates :  
JDK-8184995 - assert(out == prev || prev == __null) failed: no branches off of store slice
Relates :  
JDK-8175096 - Analyse subword in the loop to set maximum vector size.
Description
Switch UseSubwordForMaxVector flag off by default.

src/share/vm/opto/c2_globals.hpp
@@ -192,7 +192,7 @@
           "of rounds of unroll,optimize,..")                                \
           range(0, max_jint)                                                \
                                                                             \
-  product(bool, UseSubwordForMaxVector, true,                               \
+  product(bool, UseSubwordForMaxVector, false,                              \
           "Use Subword Analysis to set maximum vector size")                \
                                                                             \
   develop(intx, UnrollLimitForProfileCheck, 1,                              \