[builder th] detekcja altivec -> sigsegv

[Pawel Sikora]

na builderze Th dzieja sie dziwne rzeczy.

processor       : 0
cpu             : 7450
clock           : 700MHz
revision        : 2.1 (pvr 8000 0201)
bogomips        : 696.32
machine         : PowerMac4,4
motherboard     : PowerMac4,4 MacRISC2 MacRISC Power Macintosh
detected as     : 80 (eMac)
pmac flags      : 00000001
L2 cache        : 256K unified
memory          : 384MB
pmac-generation : NewWorld

Linux anduril 2.6.8 #1 Tue Oct 19 18:04:24 UTC 2004 ppc
                    PowerMac4,4 unknown PLD Linux

ten procek ma na pewno altivec-a, a program testujacy
sypie sie na instrukcji `vand` z SIGSEGV. no naprawde cudownie.

Dump of assembler code for function arch_accel:
0x10000520 <arch_accel+0>:      mflr    r0
0x10000524 <arch_accel+4>:      lis     r4,4096
0x10000528 <arch_accel+8>:      stwu    r1,-16(r1)
0x1000052c <arch_accel+12>:     addi    r4,r4,1228
0x10000530 <arch_accel+16>:     li      r3,4
0x10000534 <arch_accel+20>:     stw     r0,20(r1)
0x10000538 <arch_accel+24>:     bl      0x10010a48 <signal>
0x1000053c <arch_accel+28>:     lis     r3,4097
0x10000540 <arch_accel+32>:     li      r4,1
0x10000544 <arch_accel+36>:     addi    r3,r3,2704
0x10000548 <arch_accel+40>:     bl      0x10010a40 <__sigsetjmp>
0x1000054c <arch_accel+44>:     cmpwi   cr7,r3,0
0x10000550 <arch_accel+48>:     li      r4,0
0x10000554 <arch_accel+52>:     li      r3,4
0x10000558 <arch_accel+56>:     li      r11,-1
0x1000055c <arch_accel+60>:     beq-    cr7,0x10000578 <arch_accel+88>
0x10000560 <arch_accel+64>:     bl      0x10010a48 <signal>
0x10000564 <arch_accel+68>:     lwz     r0,20(r1)
0x10000568 <arch_accel+72>:     li      r3,0
0x1000056c <arch_accel+76>:     addi    r1,r1,16
0x10000570 <arch_accel+80>:     mtlr    r0
0x10000574 <arch_accel+84>:     blr
0x10000578 <arch_accel+88>:     li      r0,1
0x1000057c <arch_accel+92>:     lis     r9,4097
0x10000580 <arch_accel+96>:     stw     r0,2540(r9)
0x10000584 <arch_accel+100>:    mtvrsave r11
0x10000588 <arch_accel+104>:    vand    v0,v0,v0     <= segmentation fault
0x1000058c <arch_accel+108>:    li      r3,4
0x10000590 <arch_accel+112>:    li      r4,0
0x10000594 <arch_accel+116>:    bl      0x10010a48 <signal>
0x10000598 <arch_accel+120>:    lwz     r0,20(r1)
0x1000059c <arch_accel+124>:    li      r3,1
0x100005a0 <arch_accel+128>:    addi    r1,r1,16
0x100005a4 <arch_accel+132>:    mtlr    r0
0x100005a8 <arch_accel+136>:    blr

-- 
The only thing necessary for the triumph of evil
  is for good men to do nothing.
                                           - Edmund Burke
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