> which version of g++ is that, and also important, what is your processor ?
>
> The usual options for povray on x86_64 with g++ is :  -pipe
> -Wno-multichar -Wno-write-strings -fno-enforce-eh-specs -s -O3
> -ffast-math -march=native -pthread
>
> it is rather strange that march=native allowed a generation with
> unsupported assembly (unless the g++ version did not know about your
> processor, or you did not update the assembler too ?)

g++ (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3

My processor is Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz

Other interesting data:
SO: Ubuntu 12.04.03 LTS 64 bits

$ lspci
00:00.0 Host bridge: Intel Corporation 4th Gen Core Processor DRAM Controller
(rev 06)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI
Express x16 Controller (rev 06)
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen
Core Processor Integrated Graphics Controller (rev 06)
00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor
HD Audio Controller (rev 06)
00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family
USB xHCI (rev 05)
00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series Chipset
Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family
USB EHCI #2 (rev 05)
00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High
Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI
Express Root Port #1 (rev d5)
00:1c.2 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI
Express Root Port #3 (rev d5)
00:1c.5 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI
Express Root Port #6 (rev d5)
00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family
USB EHCI #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation C220 Series Chipset Family H81 Express LPC
Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 8 Series/C220 Series Chipset Family
6-port SATA Controller 1 [AHCI mode] (rev 05)
00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus
Controller (rev 05)
01:00.0 VGA compatible controller: NVIDIA Corporation GF119 [GeForce GT 610]
(rev a1)
01:00.1 Audio device: NVIDIA Corporation GF119 HDMI Audio Controller (rev a1)
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411
PCI Express Gigabit Ethernet Controller (rev 06)
04:00.0 Network controller: Qualcomm Atheros AR9485 Wireless Network Adapter
(rev 01)

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