[Bug tree-optimization/34011] Memory load is not eliminated from tight vectorized loop

[rguenth at gcc dot gnu dot org]

------- Comment #5 from rguenth at gcc dot gnu dot org  2009-09-15 14:40 -------
Which is likely because it decides to allocate $cx for the load destination
(operand for the scalar shift) and then needs to re-load it to $xmm? for the
vector shift.  The placement of the re-load inside the loop is unfortunate...

Reloads for insn # 67
Reload 0: reload_in (SI) = (reg:SI 116 [ pretmp.11 ])
        SSE_REGS, RELOAD_FOR_INPUT (opnum = 2)
        reload_in_reg: (reg:SI 116 [ pretmp.11 ])
        reload_reg_rtx: (reg:SI 22 xmm1)

Reloads for insn # 83
Reload 0: reload_in (QI) = (subreg:QI (reg:SI 116 [ pretmp.11 ]) 0)
        CREG, RELOAD_FOR_INPUT (opnum = 2)
        reload_in_reg: (subreg:QI (reg:SI 116 [ pretmp.11 ]) 0)
        reload_reg_rtx: (reg:QI 2 cx)


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34011