JDK-8303885 : SLP fails due to different address patters on 32bit JVM
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 21
  • Priority: P4
  • Status: Open
  • Resolution: Unresolved
  • CPU: x86
  • Submitted: 2023-03-09
  • Updated: 2023-03-09
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tbdUnresolved
Related Reports
Relates :  
JDK-8303105 - LoopRangeStrideTest fails IR verification on x86
Description
Test: LoopRangeStrideTest.countDownLoopWithNegScale fails to vectorized on x86.

Problem is around recognizing valid address expression during SWPointer creation for memory operands with 32 bit jvm, this prevents gathering adjacent memory operations. -XX:+TraceSuperWord -XX:+TraceNewVectors -XX:CompileCommand=VectorizeDebug,<method>,3 shows following errors .

SWPointer::memory_alignment: SWPointer p invalid, return bottom_align
SWPointer::memory_alignment: SWPointer p invalid, return bottom_align
SWPointer::memory_alignment: SWPointer p invalid, return bottom_align
SWPointer::memory_alignment: SWPointer p invalid, return bottom_align
SWPointer::memory_alignment: SWPointer p invalid, return bottom_align

Behavior also exist in JDK17 LTS.