The error should be fixed (the printf warning remains).
Your compiler is strange:
- it has 32-bit long (we talked about this before). This is allowed, but unusual. You can verify this by e.g. checking sizeof(long)
- it seems that std::string is basic_string<wchar_t> (from the warning message). This is, in my understanding of the C++ standard, not allowed.

[QUOTE=kracker;541453]Windows compilation:

[code]
g++ -MT Gpu.o -MMD -MP -MF .d/Gpu.Td -Wall -O2 -std=c++17 -c -o Gpu.o Gpu.cpp
In file included from ProofSet.h:6,
from Gpu.cpp:4:
File.h: In static member function 'static File File::open(const std::filesystem::__cxx11::path&, const char*, bool)':
File.h:33:25: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'const value_type*' {aka 'const wchar_t*'} [-Wformat=]
33 | log("Can't open '%s' (mode '%s')\n", name.c_str(), mode);
| ~^ ~~~~~~~~~~~~
| | |
| char* const value_type* {aka const wchar_t*}
| %hs
Gpu.cpp: In member function 'std::tuple<bool, long long unsigned int, unsigned int> Gpu::isPrimePRP(u32, const Args&, std::atomic<unsigned int>&)':
Gpu.cpp:881:51: warning: left shift count >= width of type [-Wshift-count-overflow]
881 | constexpr float roundScale = 1.0 / (1L << 32);
| ^~
Gpu.cpp:881:42: warning: division by zero [-Wdiv-by-zero]
881 | constexpr float roundScale = 1.0 / (1L << 32);
| ~~~~^~~~~~~~~~~~
Gpu.cpp:881:48: error: right operand of shift expression '(1 << 32)' is >= than the precision of the left operand [-fpermissive]
881 | constexpr float roundScale = 1.0 / (1L << 32);
| ~~~~^~~~~~
make: *** [Makefile:30: Gpu.o] Error 1
[/code][/QUOTE]

ROCm 3.1 is now the recommended platform for AMD GPUs -- it is the fastest, and also actively tuned for.

[QUOTE=preda;541454]The error should be fixed (the printf warning remains).
Your compiler is strange:
- it has 32-bit long (we talked about this before). This is allowed, but unusual. You can verify this by e.g. checking sizeof(long)
- it seems that std::string is basic_string<wchar_t> (from the warning message). This is, in my understanding of the C++ standard, not allowed.[/QUOTE]
long is apparently 4 byte in Visual Studio or gcc typically on Windows:

[url]https://docs.microsoft.com/en-us/cpp/cpp/fundamental-types-cpp?view=vs-2019[/url]
[url]https://stackoverflow.com/questions/22344388/size-of-long-int-and-int-in-c-showing-4-bytes[/url]

No, that's [QUOTE]Visual Studio 2008 on a 32-bit architecture[/QUOTE].
On a 64-bit architecture (as is common), I expect even VS has sizeof(long)==8, nowadays.
As I said, the size of long is not mandated by C++. It's just normal for long to be 64bit (on 64-bit architectures), but if it isn't that's withing the rules.

OK, reading more on the first link, I see that they state that long is 32bit even on 64bit arch. That's a MS-VS idiosyncrasy then. Good to know.

[QUOTE=kriesel;541459]long is apparently 4 byte in Visual Studio or gcc typically on Windows:

[url]https://docs.microsoft.com/en-us/cpp/cpp/fundamental-types-cpp?view=vs-2019[/url]
[url]https://stackoverflow.com/questions/22344388/size-of-long-int-and-int-in-c-showing-4-bytes[/url][/QUOTE]

[QUOTE=preda;541462]No, that's .
On a 64-bit architecture (as is common), I expect even VS has sizeof(long)==8, nowadays.
As I said, the size of long is not mandated by C++. It's just normal for long to be 64bit (on 64-bit architectures), but if it isn't that's withing the rules.

OK, reading more on the first link, I see that they state that long is 32bit even on 64bit arch. That's a MS-VS idiosyncrasy then. Good to know.[/QUOTE]

long long is typically how you get the 8 byte version on windows.

[QUOTE=preda;541462]No, that's .
On a 64-bit architecture (as is common), I expect even VS has sizeof(long)==8, nowadays.
As I said, the size of long is not mandated by C++. It's just normal for long to be 64bit (on 64-bit architectures), but if it isn't that's withing the rules.

OK, reading more on the first link, I see that they state that long is 32bit even on 64bit arch. That's a MS-VS idiosyncrasy then. Good to know.[/QUOTE]
Also 4-byte on the gcc compile performed on Windows, per the second link.

robust fail to start PRP
 

I don't know why, but -fft 0 through -fft +5 all hit EE in 800 iterations on this exponent 131500093. Gpuowl v6.11-134-g1e0ce1d chose the initial 7M fft length on its own. After finding it reproducible, I successively incremented -fft to seek a reliable run case. It wasn't until it reached 9M fft that it succeeded in the GEC. The resulting speed penalty is considerable, 7.5 msec/iter versus 5.3 on an RX480. From the program's help output,[CODE]FFT 7M [ 11.01M - 132.46M] 1K-512-7 256-2K-7 512-1K-7 2K-256-7
FFT 8M [ 12.58M - 150.85M] 2K-2K 4K-1K
FFT 9M [ 14.16M - 169.18M] 1K-512-9 256-2K-9 512-1K-9 2K-256-9[/CODE][CODE]C:\msys64\home\ken\gpuowl-compile\gpuowl-v6.11-134-g1e0ce1d\rx480>gpuowl-win
2020-04-01 07:47:57 gpuowl v6.11-134-g1e0ce1d
2020-04-01 07:47:57 config: -device 0 -user kriesel -cpu condorella/rx480 -yield -maxAlloc 7500 -use NO_ASM
2020-04-01 07:47:57 device 0, unique id ''
2020-04-01 07:47:57 condorella/rx480 131500093 FFT 7168K: Width 256x4, Height 64x8, Middle 7; 17.92 bits/word
2020-04-01 07:47:59 condorella/rx480 OpenCL args "-DEXP=131500093u -DWIDTH=1024u -DSMALL_HEIGHT=512u -DMIDDLE=7u -DWEIGHT_STEP=0x8.7b964bd91a558p-3 -DIWEIGHT_STEP=0xf.16e489ea55fc8p-4 -DWEIGHT_BIGSTEP=0xd.744fccad69d68p-3 -DIWEIGHT_BIGSTEP=0x9.837f0518db8a8p-4 -DAMDGPU=1 -DNO_ASM=1 -I. -cl-fast-relaxed-math -cl-std=CL2.0"
2020-04-01 07:48:03 condorella/rx480 OpenCL compilation in 3.97 s
2020-04-01 07:48:06 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:48:13 condorella/rx480 131500093 EE 800 0.00%; 5272 us/it; ETA 8d 00:34; 6781adfa7991c92a (check 2.31s)
2020-04-01 07:48:15 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:48:22 condorella/rx480 131500093 EE 800 0.00%; 5309 us/it; ETA 8d 01:56; 6781adfa7991c92a (check 2.31s) 1 errors
2020-04-01 07:48:24 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:48:31 condorella/rx480 131500093 EE 800 0.00%; 5298 us/it; ETA 8d 01:32; 6781adfa7991c92a (check 2.33s) 2 errors
2020-04-01 07:48:31 condorella/rx480 3 sequential errors, will stop.
2020-04-01 07:48:31 condorella/rx480 Exiting because "too many errors"
2020-04-01 07:48:31 condorella/rx480 Bye
C:\msys64\home\ken\gpuowl-compile\gpuowl-v6.11-134-g1e0ce1d\rx480>g611

C:\msys64\home\ken\gpuowl-compile\gpuowl-v6.11-134-g1e0ce1d\rx480>gpuowl-win
2020-04-01 07:48:50 gpuowl v6.11-134-g1e0ce1d
2020-04-01 07:48:50 config: -device 0 -user kriesel -cpu condorella/rx480 -yield -maxAlloc 7500 -use NO_ASM -fft +1
2020-04-01 07:48:50 device 0, unique id ''
2020-04-01 07:48:50 condorella/rx480 131500093 FFT 7168K: Width 64x4, Height 256x8, Middle 7; 17.92 bits/word
2020-04-01 07:48:53 condorella/rx480 OpenCL args "-DEXP=131500093u -DWIDTH=256u -DSMALL_HEIGHT=2048u -DMIDDLE=7u -DWEIGHT_STE
P=0x8.7b964bd91a558p-3 -DIWEIGHT_STEP=0xf.16e489ea55fc8p-4 -DWEIGHT_BIGSTEP=0xd.744fccad69d68p-3 -DIWEIGHT_BIGSTEP=0x9.837f05
18db8a8p-4 -DAMDGPU=1 -DNO_ASM=1 -I. -cl-fast-relaxed-math -cl-std=CL2.0"
2020-04-01 07:48:57 condorella/rx480 OpenCL compilation in 4.67 s
2020-04-01 07:49:01 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:49:11 condorella/rx480 131500093 EE 800 0.00%; 7714 us/it; ETA 11d 17:46; 55f854bea6c1cecf (check 3.28s)
2020-04-01 07:49:14 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:49:24 condorella/rx480 131500093 EE 800 0.00%; 7697 us/it; ETA 11d 17:10; 55f854bea6c1cecf (check 3.29s) 1 errors
2020-04-01 07:49:27 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:49:37 condorella/rx480 131500093 EE 800 0.00%; 7687 us/it; ETA 11d 16:46; 55f854bea6c1cecf (check 3.27s) 2 errors
2020-04-01 07:49:37 condorella/rx480 3 sequential errors, will stop.
2020-04-01 07:49:37 condorella/rx480 Exiting because "too many errors"
2020-04-01 07:49:37 condorella/rx480 Bye
C:\msys64\home\ken\gpuowl-compile\gpuowl-v6.11-134-g1e0ce1d\rx480>g611

C:\msys64\home\ken\gpuowl-compile\gpuowl-v6.11-134-g1e0ce1d\rx480>gpuowl-win
2020-04-01 07:50:25 gpuowl v6.11-134-g1e0ce1d
2020-04-01 07:50:25 config: -device 0 -user kriesel -cpu condorella/rx480 -yield -maxAlloc 7500 -use NO_ASM -fft +2
2020-04-01 07:50:25 device 0, unique id ''
2020-04-01 07:50:25 condorella/rx480 131500093 FFT 7168K: Width 64x8, Height 256x4, Middle 7; 17.92 bits/word
2020-04-01 07:50:27 condorella/rx480 OpenCL args "-DEXP=131500093u -DWIDTH=512u -DSMALL_HEIGHT=1024u -DMIDDLE=7u -DWEIGHT_STEP=0x8.7b964bd91a558p-3 -DIWEIGHT_STEP=0xf.16e489ea55fc8p-4 -DWEIGHT_BIGSTEP=0xa.5fed6a9b15138p-3 -DIWEIGHT_BIGSTEP=0xc.5672a115506d8p-4 -DAMDGPU=1 -DNO_ASM=1 -I. -cl-fast-relaxed-math -cl-std=CL2.0"
2020-04-01 07:50:31 condorella/rx480 OpenCL compilation in 3.72 s
2020-04-01 07:50:34 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:50:42 condorella/rx480 131500093 EE 800 0.00%; 6286 us/it; ETA 9d 13:37; 6f8253cbb2fe58e9 (check 2.71s)
2020-04-01 07:50:45 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:50:53 condorella/rx480 131500093 EE 800 0.00%; 6283 us/it; ETA 9d 13:29; 6f8253cbb2fe58e9 (check 2.71s) 1 errors
2020-04-01 07:50:56 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:51:03 condorella/rx480 131500093 EE 800 0.00%; 6299 us/it; ETA 9d 14:05; 6f8253cbb2fe58e9 (check 2.71s) 2 errors
2020-04-01 07:51:03 condorella/rx480 3 sequential errors, will stop.
2020-04-01 07:51:03 condorella/rx480 Exiting because "too many errors"
2020-04-01 07:51:03 condorella/rx480 Bye
C:\msys64\home\ken\gpuowl-compile\gpuowl-v6.11-134-g1e0ce1d\rx480>g611

C:\msys64\home\ken\gpuowl-compile\gpuowl-v6.11-134-g1e0ce1d\rx480>gpuowl-win
2020-04-01 07:51:29 gpuowl v6.11-134-g1e0ce1d
2020-04-01 07:51:29 config: -device 0 -user kriesel -cpu condorella/rx480 -yield -maxAlloc 7500 -use NO_ASM -fft +3
2020-04-01 07:51:29 device 0, unique id ''
2020-04-01 07:51:29 condorella/rx480 131500093 FFT 7168K: Width 256x8, Height 64x4, Middle 7; 17.92 bits/word
2020-04-01 07:51:29 condorella/rx480 using long carry kernels
2020-04-01 07:51:32 condorella/rx480 OpenCL args "-DEXP=131500093u -DWIDTH=2048u -DSMALL_HEIGHT=256u -DMIDDLE=7u -DWEIGHT_STE
P=0x8.7b964bd91a558p-3 -DIWEIGHT_STEP=0xf.16e489ea55fc8p-4 -DWEIGHT_BIGSTEP=0xa.5fed6a9b15138p-3 -DIWEIGHT_BIGSTEP=0xc.5672a1
15506d8p-4 -DAMDGPU=1 -DNO_ASM=1 -I. -cl-fast-relaxed-math -cl-std=CL2.0"
2020-04-01 07:51:36 condorella/rx480 OpenCL compilation in 3.97 s
2020-04-01 07:51:39 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:51:46 condorella/rx480 131500093 EE 800 0.00%; 5275 us/it; ETA 8d 00:42; cfbd904e74b67aae (check 2.31s)
2020-04-01 07:51:48 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:51:54 condorella/rx480 131500093 EE 800 0.00%; 5249 us/it; ETA 7d 23:44; cfbd904e74b67aae (check 2.29s)1 errors
2020-04-01 07:51:57 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:52:03 condorella/rx480 131500093 EE 800 0.00%; 5239 us/it; ETA 7d 23:23; cfbd904e74b67aae (check 2.29s)2 errors
2020-04-01 07:52:03 condorella/rx480 3 sequential errors, will stop.
2020-04-01 07:52:03 condorella/rx480 Exiting because "too many errors"
2020-04-01 07:52:03 condorella/rx480 Bye
C:\msys64\home\ken\gpuowl-compile\gpuowl-v6.11-134-g1e0ce1d\rx480>g611

C:\msys64\home\ken\gpuowl-compile\gpuowl-v6.11-134-g1e0ce1d\rx480>gpuowl-win
2020-04-01 07:52:07 gpuowl v6.11-134-g1e0ce1d
2020-04-01 07:52:07 config: -device 0 -user kriesel -cpu condorella/rx480 -yield -maxAlloc 7500 -use NO_ASM -fft +4
2020-04-01 07:52:07 device 0, unique id ''
2020-04-01 07:52:07 condorella/rx480 131500093 FFT 8192K: Width 256x8, Height 256x8; 15.68 bits/word
2020-04-01 07:52:07 condorella/rx480 using long carry kernels
2020-04-01 07:52:10 condorella/rx480 OpenCL args "-DEXP=131500093u -DWIDTH=2048u -DSMALL_HEIGHT=2048u -DMIDDLE=1u -DWEIGHT_ST
EP=0xa.039f00d8f95f8p-3 -DIWEIGHT_STEP=0xc.c82be96a7181p-4 -DWEIGHT_BIGSTEP=0xa.5fed6a9b15138p-3 -DIWEIGHT_BIGSTEP=0xc.5672a1
15506d8p-4 -DAMDGPU=1 -DNO_ASM=1 -I. -cl-fast-relaxed-math -cl-std=CL2.0"
2020-04-01 07:52:15 condorella/rx480 OpenCL compilation in 5.16 s
2020-04-01 07:52:18 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:52:27 condorella/rx480 131500093 EE 800 0.00%; 6583 us/it; ETA 10d 00:28; 05252a7f59574e37 (check 2.85s)
2020-04-01 07:52:30 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:52:38 condorella/rx480 131500093 EE 800 0.00%; 6587 us/it; ETA 10d 00:36; 05252a7f59574e37 (check 2.85s) 1 errors
2020-04-01 07:52:41 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:52:49 condorella/rx480 131500093 EE 800 0.00%; 6594 us/it; ETA 10d 00:53; 05252a7f59574e37 (check 2.86s) 2 errors
2020-04-01 07:52:49 condorella/rx480 3 sequential errors, will stop.
2020-04-01 07:52:49 condorella/rx480 Exiting because "too many errors"
2020-04-01 07:52:49 condorella/rx480 Bye
C:\msys64\home\ken\gpuowl-compile\gpuowl-v6.11-134-g1e0ce1d\rx480>g611

C:\msys64\home\ken\gpuowl-compile\gpuowl-v6.11-134-g1e0ce1d\rx480>gpuowl-win
2020-04-01 07:53:21 gpuowl v6.11-134-g1e0ce1d
2020-04-01 07:53:21 config: -device 0 -user kriesel -cpu condorella/rx480 -yield -maxAlloc 7500 -use NO_ASM -fft +5
2020-04-01 07:53:21 device 0, unique id ''
2020-04-01 07:53:21 condorella/rx480 131500093 FFT 8192K: Width 512x8, Height 256x4; 15.68 bits/word
2020-04-01 07:53:21 condorella/rx480 using long carry kernels
2020-04-01 07:53:23 condorella/rx480 OpenCL args "-DEXP=131500093u -DWIDTH=4096u -DSMALL_HEIGHT=1024u -DMIDDLE=1u -DWEIGHT_ST
EP=0xa.039f00d8f95f8p-3 -DIWEIGHT_STEP=0xc.c82be96a7181p-4 -DWEIGHT_BIGSTEP=0xa.5fed6a9b15138p-3 -DIWEIGHT_BIGSTEP=0xc.5672a1
15506d8p-4 -DAMDGPU=1 -DNO_ASM=1 -I. -cl-fast-relaxed-math -cl-std=CL2.0"
2020-04-01 07:53:26 condorella/rx480 OpenCL compilation in 3.53 s
2020-04-01 07:53:30 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:53:39 condorella/rx480 131500093 EE 800 0.00%; 7196 us/it; ETA 10d 22:51; 6df742314b82f841 (check 3.11s)
2020-04-01 07:53:42 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:53:51 condorella/rx480 131500093 EE 800 0.00%; 7219 us/it; ETA 10d 23:43; 6df742314b82f841 (check 3.11s) 1 errors
2020-04-01 07:53:54 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:54:03 condorella/rx480 131500093 EE 800 0.00%; 7190 us/it; ETA 10d 22:38; 6df742314b82f841 (check 3.10s) 2 errors
2020-04-01 07:54:03 condorella/rx480 3 sequential errors, will stop.
2020-04-01 07:54:03 condorella/rx480 Exiting because "too many errors"
2020-04-01 07:54:03 condorella/rx480 Bye
C:\msys64\home\ken\gpuowl-compile\gpuowl-v6.11-134-g1e0ce1d\rx480>g611

C:\msys64\home\ken\gpuowl-compile\gpuowl-v6.11-134-g1e0ce1d\rx480>gpuowl-win
2020-04-01 07:54:08 gpuowl v6.11-134-g1e0ce1d
2020-04-01 07:54:08 config: -device 0 -user kriesel -cpu condorella/rx480 -yield -maxAlloc 7500 -use NO_ASM -fft +6
2020-04-01 07:54:08 device 0, unique id ''
2020-04-01 07:54:08 condorella/rx480 131500093 FFT 9216K: Width 256x4, Height 64x8, Middle 9; 13.93 bits/word
2020-04-01 07:54:08 condorella/rx480 using long carry kernels
2020-04-01 07:54:12 condorella/rx480 OpenCL args "-DEXP=131500093u -DWIDTH=1024u -DSMALL_HEIGHT=512u -DMIDDLE=9u -DWEIGHT_STEP=0x8.5f7e7ead6051p-3 -DIWEIGHT_STEP=0xf.498539ec95fe8p-4 -DWEIGHT_BIGSTEP=0xd.744fccad69d68p-3 -DIWEIGHT_BIGSTEP=0x9.837f0518db8a8p-4 -DAMDGPU=1 -DNO_ASM=1 -I. -cl-fast-relaxed-math -cl-std=CL2.0"
2020-04-01 07:54:16 condorella/rx480 OpenCL compilation in 4.11 s
2020-04-01 07:54:20 condorella/rx480 131500093 OK 0 loaded: blockSize 400, 0000000000000003
2020-04-01 07:54:29 condorella/rx480 131500093 OK 800 0.00%; 7461 us/it; ETA 11d 08:32; bbe24bd13cd73020 (check 3.26s)
2020-04-01 08:19:33 condorella/rx480 131500093 OK 200000 0.15%; 7541 us/it; ETA 11d 11:03; 190bb27ff665f83b (check 3.25s)
[/CODE]

[QUOTE=kriesel;541479]I don't know why, but -fft 0 through -fft +5 all hit EE in 800 iterations on this exponent 131500093.[/QUOTE]

Works for me on Linux rocm 3.1. Maybe a Windows compiler / driver bug?

[QUOTE=henryzz;541463]long long is typically how you get the 8 byte version on windows.[/QUOTE]

Lack of unambiguous-length basic data types was one of the great blunders of the C language standard. Here is the snip of preprocessor code I use in my Mlucas types.h file, the 64-bit section includes a small hack from George. I'm sure event this is not completely portable, but it has served me well. 'MSVC' refers to Visual Studio, OS_BITS is an Mlucas predef reflecting the bit-ness (32 or 64) of the OS:
[code]typedef char int8;
typedef char sint8;
typedef unsigned char uint8;

typedef short int16;
typedef short sint16;
typedef unsigned short uint16;

typedef int int32;
typedef int sint32;
typedef unsigned int uint32;

/* 64-bit int: */
/* MSVC doesn't like 'long long', and of course MS has their own
completely non-portable substitute:
*/
#if(defined(OS_TYPE_WINDOWS) && defined(COMPILER_TYPE_MSVC))
typedef signed __int64 int64;
typedef signed __int64 sint64;
typedef unsigned __int64 uint64;
typedef const signed __int64 int64c;
typedef const signed __int64 sint64c;
typedef const unsigned __int64 uint64c;

/* GW: In many cases where the C code is interfacing with the assembly code */
/* we must declare variables that are exactly 32-bits wide. This is the */
/* portable way to do this, as the linux x86-64 C compiler defines the */
/* long data type as 64 bits. We also use portable definitions for */
/* values that can be either an integer or a pointer. */
#if OS_BITS == 64
typedef int64 intptr_t;
typedef uint64 uintptr_t;
#else
typedef int32 intptr_t;
typedef uint32 uintptr_t;
#endif

#else
typedef long long int64;
typedef long long sint64;
typedef unsigned long long uint64;
typedef const long long int64c;
typedef const long long sint64c;
typedef const unsigned long long uint64c;
#endif[/code]

[QUOTE=Prime95;541498]Works for me on Linux rocm 3.1. Maybe a Windows compiler / driver bug?[/QUOTE]
Reproduced here, on gpuowl-win v6.11-134, -fft 0 and -fft +5:
RX550 on same system as previous report; driver 25.20.14007.1000 (Adrenalin 18.10.2) / Win7 64

An RX550 on separate system, driver 26.20.12028.2 (Adrenalin 19.20)/Win10 64
A Radeon VII, on driver 26.20.12028.2 (Adrenalin 19.20)/Win10 64

Not reproduced here, on gpuowl-win v6.11-198, same Radeon VII as above, same system, same driver.
Also not reproduced, on gpuowl-win v6.11-219-ge70ec99, on the same RX480, system, driver combo that led this off with the previous post 2031.

All my gpuowl-win builds are done on the one system where the RX480 resides, with the same step by step build process;
mkdir latest
cd latest
git clone [URL]https://github.com/preda/gpuowl[/URL]
cd gpuowl
make gpuowl-win.exe

I'm investigating.

[QUOTE=kriesel;541479]I don't know why, but -fft 0 through -fft +5 all hit EE in 800 iterations on this exponent 131500093. Gpuowl v6.11-134-g1e0ce1d[/QUOTE]