Merge

8031752: Failed speculative optimizations should be reattempted when root of compilation is different Summary: support for speculative traps that keep track of the root of the compilation in which a trap occurs. Reviewed-by: kvn, twisti

8033260: assert(lrg._area >= 0.0) failed: negative spill area Summary: Change type from float to double on block frequency, and add check for +Inf - +Inf operation Reviewed-by: kvn, roland

8032656: Tag the MachSpillCopies with purpose information Summary: Subclassed the MachSpillCopyNode with different subnodes for different spill purposes to enhance debugging / visualization Reviewed-by: kvn, roland

8034775: Failing to initialize VM when running with negative value for -XX:CICompilerCount Summary: Ensure appropriate min. number of compiler threads (1 for non-tiered, and 2 for tiered) Reviewed-by: kvn

8032894: Remove dead code in Pressure::lower Summary: Remove dead code in Pressure::lower Reviewed-by: kvn, roland

8027754: Enable loop optimizations for loops with MathExact inside Reviewed-by: kvn, iveresov

8033805: Move Fast_Lock/Fast_Unlock code from .ad files to macroassembler Summary: Consolidated C2 x86 locking code in one place in macroAssembler_x86.cpp. Reviewed-by: roland

Merge

8035746: Add missing Klass::oop_is_instanceClassLoader() function Reviewed-by: mgerdin, coleenp

8035648: Don't use Handle in java_lang_String::print Reviewed-by: coleenp, pliden

8035822: Unable to test minimalVM Summary: Moved the test code inside INCLUDE_ALL_GCS Reviewed-by: dholmes, stefank

Merge

8034948: Back out JDK-6976350 since it does not fix any issue Summary: Revert JDK-6976350 because it does not improve PLAB fragmentation. To the contrary, it tends to increase the amount of wasted space with many threads. Reviewed-by: brutisso