hotspot/src/share/vm/opto/superword.hpp

rev 7350 : 8078497: C2's superword optimization causes unaligned memory accesses
Summary: Prevent vectorization of memory operations with different invariant offsets if unaligned memory accesses are not allowed.
Reviewed-by: kvn

*** 39,49 ****
  // Algorithm from:
  //
  // Exploiting SuperWord Level Parallelism with
  //   Multimedia Instruction Sets
  // by
! //   Samuel Larsen and Saman Amarasighe
  //   MIT Laboratory for Computer Science
  // date
  //   May 2000
  // published in
  //   ACM SIGPLAN Notices
--- 39,49 ----
  // Algorithm from:
  //
  // Exploiting SuperWord Level Parallelism with
  //   Multimedia Instruction Sets
  // by
! //   Samuel Larsen and Saman Amarasinghe
  //   MIT Laboratory for Computer Science
  // date
  //   May 2000
  // published in
  //   ACM SIGPLAN Notices
*** 430,440 ****
    MemNode*   _mem;     // My memory reference node
    SuperWord* _slp;     // SuperWord class
  
    Node* _base;         // NULL if unsafe nonheap reference
    Node* _adr;          // address pointer
!   jint  _scale;        // multipler for iv (in bytes), 0 if no loop iv
    jint  _offset;       // constant offset (in bytes)
    Node* _invar;        // invariant offset (in bytes), NULL if none
    bool  _negate_invar; // if true then use: (0 - _invar)
  
    PhaseIdealLoop* phase() { return _slp->phase(); }
--- 430,440 ----
    MemNode*   _mem;     // My memory reference node
    SuperWord* _slp;     // SuperWord class
  
    Node* _base;         // NULL if unsafe nonheap reference
    Node* _adr;          // address pointer
!   jint  _scale;        // multiplier for iv (in bytes), 0 if no loop iv
    jint  _offset;       // constant offset (in bytes)
    Node* _invar;        // invariant offset (in bytes), NULL if none
    bool  _negate_invar; // if true then use: (0 - _invar)
  
    PhaseIdealLoop* phase() { return _slp->phase(); }