Looks like there is a bug. Smull with the scalar operand as the last operand only supports the first SIMD 16 registers (0-15). Without a testcase it is hard to say if it is a bug in the opencv or that compiler.
NOTE GCC 4.8.5 is not really supported upstream either. I know RedHat supports this version of the compiler for RHEL 7; maybe you could get them to get a fix for you.
Thanks, Andrew
-----Original Message----- From: linaro-toolchain [mailto:linaro-toolchain-bounces@lists.linaro.org] On Behalf Of xinliang Sent: Monday, January 21, 2019 6:31 PM To: Christophe Lyon christophe.lyon@linaro.org Cc: tiantao (H) tiantao6@huawei.com; yeguanhua yeguanhua@huawei.com; sam.yangli@huawei.com; Linaro Toolchain linaro-toolchain@lists.linaro.org; Martin Stadtler martin.stadtler@linaro.org Subject: [EXT] Re: Any 4.8.5 cross compile toolchain?
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On 2019/1/10 20:05, Christophe Lyon wrote:
On Thu, 10 Jan 2019 at 08:01, xinliang z.liuxinliang@hisilicon.com wrote:
On 2019/1/9 17:23, Christophe Lyon wrote:
On Wed, 9 Jan 2019 at 10:18, xinliang z.liuxinliang@hisilicon.com wrote:
Hi Martin and Linaro-toolchain team, We want to use 4.8.5 cross compile toolchain to build ko. But we can't find such version on the release site[1]. Is there a 4.8.5 cross compile toolchain?
Hi Xinliang,
Not anymore... as you can see on the release site, our last 4.9 toolchain was released 2 years ago. At present, only gcc-7 and 8 are maintained, gcc-6 last release from the FSF was made a few months ago, and our last gcc-linaro-6 release should be out within a few days.
It you really want to do some archaeology, maybe such old releases are available on the old launchpad site?
Ok, thanks for replying us. You mean this site[2]? We also find 4.8 from linaro archive site[3]. The reason why we want to use 4.8.5 cross compiler to build ko is that we run things in CentOS 7.6 which got an old 4.8.5 gcc. If we use a new cross compiler such as gcc 7, the built ko will be unusable. And the used by count is a very large number.
[2] https://launchpad.net/linaro-toolchain-binaries/+download [3] https://releases.linaro.org/archive/15.06/components/toolchain/binari es/4.8/
Christophe, we use this 4.8.5 cross compiler to build opencv howerver it got error: /tmp/ccDYJmrw.s:65: Error: register number out of range 0 to 15 at operand 3 -- `smull v2.4s,v0.4h,v21.h[0]' /tmp/ccDYJmrw.s:72: Error: register number out of range 0 to 15 at operand 3 -- `smull v3.4s,v1.4h,v21.h[0]'
Does this 4.8.5 gcc support neon?
Indeed [3] should be OK.
Christophe
[1] https://releases.linaro.org/components/toolchain/gcc-linaro/ Best, Xinliang
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