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Instructions for reproducing test_kernel vector store error in shamrock:
1. Clone (new) public Linaro shamrock repo (gpgpu/shamrock.git) and checkout branch: basic_parameter_types.
2. Build per shamrock readme.
2. % cp <shamrock-src>/tests/basic_parameter_types.cl <shamrock-build>/tests
3. Run the following gdb session (see comments lines with #### ):
tests> gdb --args tests basic_parameter_types nofork
GNU gdb (GDB) 7.5.91.20130417-cvs-ubuntu
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "arm-linux-gnueabihf".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/user/shamrock_build/tests/tests...done.
(gdb) b main
Breakpoint 1 at 0xb45a: file /home/user/shamrock/tests/tests.c, line 44.
(gdb) run
Starting program: /home/user/shamrock_build/tests/tests basic_parameter_types nofork
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/arm-linux-gnueabihf/libthread_db.so.1".
Breakpoint 1, main (argc=3, argv=0xbefff704)
at /home/user/shamrock/tests/tests.c:44
44 Suite *s = NULL;
(gdb) b Coal::CPUKernelWorkGroup::run
Breakpoint 2 at 0xb53e506a: file /home/user/shamrock/src/core/cpu/kernel.cpp, line 649.
(gdb) c
Continuing.
Running suite(s): basic_parameter_types
[New Thread 0xb4de4450 (LWP 9283)]
[New Thread 0xb45e4450 (LWP 9284)]
[Switching to Thread 0xb4de4450 (LWP 9283)]
Breakpoint 2, Coal::CPUKernelWorkGroup::run (this=0xb3800468)
at /home/user/shamrock/src/core/cpu/kernel.cpp:649
649 std::vector<void *> locals_to_free;
(gdb) list
644 }
645
646 bool CPUKernelWorkGroup::run()
647 {
648 // Get the kernel function to call
649 std::vector<void *> locals_to_free;
650 llvm::Function *kernel_func = p_kernel->callFunction();
651
652 if (!kernel_func)
653 return false;
(gdb)
654
655 Program *p = (Program *)p_kernel->kernel()->parent();
656 CPUProgram *prog = (CPUProgram *)(p->deviceDependentProgram(p_kernel->device()));
657
658 // Make object usable for execution: (only applies to MCJIT):
659 prog->jit()->finalizeObject();
660
661 std::string kname = kernel_func->getName().str();
662
663 // original
(gdb)
664 p_kernel_func_addr =
665 (void(*)(void *))prog->jit()->getPointerToFunction(kernel_func);
666
667 // TAG
668 // llvm::Function *t_func = prog->jit()->FindFunctionNamed(p_kernel->p_kernel->p_name->str());
669 // llvm::Function *t_func = prog->jit()->FindFunctionNamed(p_kernel->kernel()->p_name.c_str());
670 // p_kernel_func_addr = (void(*)(void *))prog->jit()->getPointerToFunction(t_func);
671 p_kernel_func_addr =(void(*)(void *)) prog->jit()->getFunctionAddress(kname);
672
673 // Get the arguments
(gdb) b 661 #### run to after finalizeObject(), test_kernel symbol now exists
Breakpoint 3 at 0xb53e50ca: file /home/user/shamrock/src/core/cpu/kernel.cpp, line 661.
(gdb) c
Continuing.
Breakpoint 3, Coal::CPUKernelWorkGroup::run (this=0xb3800468)
at /home/user/shamrock/src/core/cpu/kernel.cpp:661
661 std::string kname = kernel_func->getName().str();
(gdb) b test_kernel
Breakpoint 4 at 0xb50cf008
(gdb) c
Continuing.
Breakpoint 4, 0xb50cf008 in test_kernel ()
(gdb) disass
Dump of assembler code for function test_kernel:
0xb50cf000 <+0>: sub sp, sp, #4
0xb50cf004 <+4>: str r0, [sp]
=> 0xb50cf008 <+8>: mov r0, sp
0xb50cf00c <+12>: vld1.32 {d16[0]}, [r0 :32]
0xb50cf010 <+16>: vmovl.u8 q8, d16
0xb50cf014 <+20>: vmov.u16 r2, d16[2]
0xb50cf018 <+24>: vmov.u16 r0, d16[0]
0xb50cf01c <+28>: sxtb r2, r2
0xb50cf020 <+32>: sxtb r0, r0
0xb50cf024 <+36>: vmov.32 d20[0], r2
0xb50cf028 <+40>: vmov.u16 r2, d16[1]
0xb50cf02c <+44>: vmov.32 d18[0], r0
0xb50cf030 <+48>: vmov.u16 r0, d16[3]
0xb50cf034 <+52>: sxtb r2, r2
0xb50cf038 <+56>: sxtb r0, r0
0xb50cf03c <+60>: vmov.32 d18[1], r2
0xb50cf040 <+64>: vmov.32 d20[1], r0
0xb50cf044 <+68>: vcvt.f32.s32 q8, q9
0xb50cf048 <+72>: vcvt.f32.s32 q9, q10
0xb50cf04c <+76>: vext.8 q8, q8, q8, #8
0xb50cf050 <+80>: vext.8 q8, q8, q9, #8
0xb50cf054 <+84>: vst1.64 {d16-d17}, [r1 :128]
0xb50cf058 <+88>: add sp, sp, #4
0xb50cf05c <+92>: bx lr
End of assembler dump.
(gdb) stepi 18
0xb50cf050 in test_kernel ()
(gdb) stepi ### step down to vst1.64 instruction.
0xb50cf054 in test_kernel ()
(gdb) display/x $r1 ### $r1 register should hold output float4 *result ptr
2: /x $r1 = 0xf94bc8
(gdb) x/4f $r1 #### hmmm, shouldn't these be all 0's?
0xf94bc8: -4.7186802e-07 2.39711496e-38 2.12743103e-07 7.56701171e-44
(gdb) display/x $d16 ### show that convert_float4(char4) worked: {0,1,2,3}
3: /x $d16 = {u8 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x80, 0x3f}, u16 = {0x0,
0x0, 0x0, 0x3f80}, u32 = {0x0, 0x3f800000}, u64 = 0x3f80000000000000,
f32 = {0x0, 0x1}, f64 = 0x0}
(gdb) display/x $d17
4: /x $d17 = {u8 = {0x0, 0x0, 0x0, 0x40, 0x0, 0x0, 0x40, 0x40}, u16 = {0x0,
0x4000, 0x0, 0x4040}, u32 = {0x40000000, 0x40400000},
u64 = 0x4040000040000000, f32 = {0x2, 0x3}, f64 = 0x20}
(gdb) stepi ### now stepi vst1.64 instruction, should store {0,1,2,3} to [$r1]
0xb50cf058 in test_kernel ()
4: /x $d17 = {u8 = {0x0, 0x0, 0x0, 0x40, 0x0, 0x0, 0x40, 0x40}, u16 = {0x0,
0x4000, 0x0, 0x4040}, u32 = {0x40000000, 0x40400000},
u64 = 0x4040000040000000, f32 = {0x2, 0x3}, f64 = 0x20}
3: /x $d16 = {u8 = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x80, 0x3f}, u16 = {0x0,
0x0, 0x0, 0x3f80}, u32 = {0x0, 0x3f800000}, u64 = 0x3f80000000000000,
f32 = {0x0, 0x1}, f64 = 0x0}
2: /x $r1 = 0xf940d9 #### OOPS! $r1 register changed! NOT POSSIBLE?
(gdb) x/4f $r1
0xf940d9: 1.66694513e-24 -7.21760423e-29 1.77866814e-41 -3.85185989e-34
(gdb) x/4f 0xf94bc8 #### and memory at old $r1 (result ptr) has garbage.
0xf94bc8: 4.20389539e-45 2.39711496e-38 2.12743103e-07 7.56701171e-44
(gdb) c
Continuing.
Conversion from char failed: got 4.2039e-45,expected 0
Conversion from char failed: got 2.39711e-38,expected 1
Conversion from char failed: got 2.12743e-07,expected 2
Conversion from char failed: got 7.56701e-44,expected 3
0%: Checks: 1, Failures: 1, Errors: 0
/home/user/shamrock/tests/test_basic_parameter_types.cpp:139:F:basic_parameter_types:test_basic_parameter_types:0: the kernel hasn't done its job, the buffer is wrong
[Thread 0xb4de4450 (LWP 9283) exited]
[Thread 0xb45e4450 (LWP 9284) exited]
[Inferior 1 (process 9280) exited with code 01]
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