[LLVMbugs] [Bug 527] Need a loop strength reduction pass

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Tue Sep 27 16:04:02 PDT 2005


sabre at nondot.org changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |1.6

------- Additional Comments From sabre at nondot.org  2005-09-27 18:04 -------
We have a strength reduction pass now.  For the code in this bug, we now generate:

LBB_init_board_1:       ; loopexit.1
        li r5, 46
        stb r5, 0(r4)
        stb r5, 1(r4)
        stb r5, 2(r4)
        stb r5, 3(r4)
        stb r5, 4(r4)
        stb r5, 5(r4)
        addi r4, r4, 7
        addi r2, r2, 1
        cmpwi cr0, r2, 7
        bne cr0, LBB_init_board_1

for the loop, instead of explicit multiplies.


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