EthanLuisMcDonough wrote:
> For some codes, I get the following error for a gfx906:
>
> ```
> LLVM ERROR: Relocation for CG Profile could not be created: unknown
> relocation name
> ```
>
> I see it for OpenMC, but the following is a simpler example:
>
> ```
> $ cat test.c
> #include <stdio.h>
> #include <stdlib.h>
> __attribute__((noinline))
> double test(double x, int n) {
> double res = 1;
> for (int i = 0; i < n; ++i)
> res *= x;
> return res;
> }
> int main(int argc, char *argv[]) {
> double x = atof(argv[1]);
> unsigned n = atoi(argv[2]);
> #pragma omp target map(tofrom:x)
> x = test(x, n);
> printf("%f\n", x);
> return 0;
> }
>
> $ clang -O2 -g -fopenmp --offload-arch=native test.c -o test \
> -fprofile-generate -fprofile-generate-gpu
>
> $ LLVM_PROFILE_FILE=test.profraw ./test 2 4
> 16.000000
>
> $ llvm-profdata merge -output=test.profdata *.profraw
>
> $ clang -O2 -g -fopenmp --offload-arch=native test.c -foffload-lto \
> -fprofile-use-gpu=test.profdata
> ```
>
> I can prevent the error by lowering the last -O2 to -O1 or by removing the
> `__attribute__((noinline))`. Am I doing something wrong?
Not sure if this is still relevant, but I think
https://github.com/llvm/llvm-project/pull/114617 should fix this issue. The ASM
builder was trying to create a reloc directive with the kind `BFD_RELOC_NONE`,
which isn't defined in `getFixupKind` for AMDGPU.
https://github.com/llvm/llvm-project/pull/94268
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