llvm:
=====
00002250 <benchmem_linear_read>:
    2250:	d7 e1 4f fc 	l.sw 0xfffffffc(r1),r9
    2254:	d7 e1 17 f8 	l.sw 0xfffffff8(r1),r2
    2258:	9c 41 00 00 	l.addi r2,r1,0x0
    225c:	9c 21 ff e4 	l.addi r1,r1,0xffffffe4
    2260:	d7 e2 77 f4 	l.sw 0xfffffff4(r2),r14
    2264:	d7 e2 87 f0 	l.sw 0xfffffff0(r2),r16
    2268:	d7 e2 77 ec 	l.sw 0xffffffec(r2),r14
    226c:	d7 e2 87 e8 	l.sw 0xffffffe8(r2),r16
    2270:	a9 c4 00 00 	l.ori r14,r4,0x0
    2274:	aa 03 00 00 	l.ori r16,r3,0x0
    2278:	9c 60 50 01 	l.addi r3,r0,0x5001
    227c:	18 80 00 00 	l.movhi r4,0x0
    2280:	04 00 11 cb 	l.jal 69ac <or1k_mtspr>
    2284:	15 00 00 00 	l.nop 0x0
    2288:	bd 8e 00 01 	l.sfltsi r14,0x1
    228c:	10 00 00 09 	l.bf 22b0 <benchmem_linear_read+0x60>
    2290:	15 00 00 00 	l.nop 0x0
    2294:	84 70 00 00 	l.lwz r3,0x0(r16)
    2298:	d7 e2 1f e4 	l.sw 0xffffffe4(r2),r3
    229c:	9e 10 00 04 	l.addi r16,r16,0x4
    22a0:	9d ce ff ff 	l.addi r14,r14,0xffffffff
    22a4:	bc 2e 00 00 	l.sfnei r14,0x0
    22a8:	13 ff ff fb 	l.bf 2294 <benchmem_linear_read+0x44>
    22ac:	15 00 00 00 	l.nop 0x0
    22b0:	9c 60 50 01 	l.addi r3,r0,0x5001
    22b4:	04 00 11 c1 	l.jal 69b8 <or1k_mfspr>
    22b8:	15 00 00 00 	l.nop 0x0
    22bc:	86 02 ff e8 	l.lwz r16,0xffffffe8(r2)
    22c0:	85 c2 ff ec 	l.lwz r14,0xffffffec(r2)
    22c4:	86 02 ff f0 	l.lwz r16,0xfffffff0(r2)
    22c8:	85 c2 ff f4 	l.lwz r14,0xfffffff4(r2)
    22cc:	9c 22 00 00 	l.addi r1,r2,0x0
    22d0:	84 41 ff f8 	l.lwz r2,0xfffffff8(r1)
    22d4:	85 21 ff fc 	l.lwz r9,0xfffffffc(r1)
    22d8:	44 00 48 00 	l.jr r9
    22dc:	15 00 00 00 	l.nop 0x0

or32-elf-gcc 4.5:
=================
000023b4 <benchmem_linear_read>:
    23b4:	d7 e1 17 f8 	l.sw 0xfffffff8(r1),r2
    23b8:	9c 41 00 00 	l.addi r2,r1,0x0
    23bc:	d7 e1 4f fc 	l.sw 0xfffffffc(r1),r9
    23c0:	9c 21 ff e8 	l.addi r1,r1,0xffffffe8
    23c4:	d7 e2 1f ec 	l.sw 0xffffffec(r2),r3
    23c8:	d7 e2 27 e8 	l.sw 0xffffffe8(r2),r4
    23cc:	07 ff ff ae 	l.jal 2284 <timer_reset_ticks>
    23d0:	15 00 00 00 	l.nop 0x0
    23d4:	9c 60 00 00 	l.addi r3,r0,0x0
    23d8:	d7 e2 1f f4 	l.sw 0xfffffff4(r2),r3
    23dc:	00 00 00 0b 	l.j 2408 <benchmem_linear_read+0x54>
    23e0:	15 00 00 00 	l.nop 0x0
    23e4:	84 62 ff f4 	l.lwz r3,0xfffffff4(r2)
    23e8:	b8 63 00 02 	l.slli r3,r3,0x2
    23ec:	84 82 ff ec 	l.lwz r4,0xffffffec(r2)
    23f0:	e0 64 18 00 	l.add r3,r4,r3
    23f4:	84 63 00 00 	l.lwz r3,0x0(r3)
    23f8:	d7 e2 1f f0 	l.sw 0xfffffff0(r2),r3
    23fc:	84 62 ff f4 	l.lwz r3,0xfffffff4(r2)
    2400:	9c 63 00 01 	l.addi r3,r3,0x1
    2404:	d7 e2 1f f4 	l.sw 0xfffffff4(r2),r3
    2408:	84 82 ff f4 	l.lwz r4,0xfffffff4(r2)
    240c:	84 62 ff e8 	l.lwz r3,0xffffffe8(r2)
    2410:	e5 84 18 00 	l.sflts r4,r3
    2414:	13 ff ff f4 	l.bf 23e4 <benchmem_linear_read+0x30>
    2418:	15 00 00 00 	l.nop 0x0
    241c:	07 ff ff a7 	l.jal 22b8 <timer_get_ticks>
    2420:	15 00 00 00 	l.nop 0x0
    2424:	a8 6b 00 00 	l.ori r3,r11,0x0
    2428:	a9 63 00 00 	l.ori r11,r3,0x0
    242c:	a8 22 00 00 	l.ori r1,r2,0x0
    2430:	84 41 ff f8 	l.lwz r2,0xfffffff8(r1)
    2434:	85 21 ff fc 	l.lwz r9,0xfffffffc(r1)
    2438:	44 00 48 00 	l.jr r9
    243c:	15 00 00 00 	l.nop 0x0