http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58092

--- Comment #7 from Rafał Miłecki <zajec5 at gmail dot com> ---
I compiled two versions of gcc on my own:
1) gcc-4.6.4.tar.bz2
2) gcc-linaro-4.6-2012.12.tar.bz2

For both of them I've used binutils-2.22.tar.bz2

test.o compiled with gcc-4.6.4.tar.bz2
00000000 <test>:
   0:   24020002        li      v0,2
   4:   aca20000        sw      v0,0(a1)
   8:   24020004        li      v0,4
   c:   14820002        bne     a0,v0,18 <test+0x18>
  10:   24020008        li      v0,8
  14:   aca20040        sw      v0,64(a1)
  18:   03e00008        jr      ra
  1c:   00000000        nop

test.o compiled with gcc-linaro-4.6-2012.12.tar.bz2
00000000 <test>:
   0:   24020002        li      v0,2
   4:   24030004        li      v1,4
   8:   aca20000        sw      v0,0(a1)
   c:   10830002        beq     a0,v1,18 <test+0x18>
  10:   24020008        li      v0,8
  14:   8ca20040        lw      v0,64(a1)
  18:   aca20040        sw      v0,64(a1)
  1c:   03e00008        jr      ra
  20:   00000000        nop

So it seems to be Linaro fault. I'll report that problem to them.

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