We ran into this internal compiler error with our open source code, described here: https://github.com/manodeep/Corrfunc/issues/100. We have fixed it for the repo but figured it might be helpful for the compiler developers.
Thanks to the efforts of Lehman Garrison (github: @lgarrison), here is a minimum failing example:
#include <immintrin.h>
#include <stdio.h>
#include <stdint.h>
#define MAX_NUM_WEIGHTS 10
typedef union {
__m256d a;
double d;
} weights_union;
typedef struct
{
int64_t num_weights;
weights_union weights0[MAX_NUM_WEIGHTS];
weights_union dx;
} pair_struct;
int main(void){
int64_t num_weights = 0;
pair_struct pair = {.num_weights = num_weights,
.dx.d=0.
};
return 0;
}
Compiling with "icc -std=c99 -Wall test.c -o test" causes the following error:
": internal error: ** The compiler has encountered an unexpected problem.
** Segmentation violation signal raised. **
Access violation or stack overflow. Please contact Intel Support for assistance.
icc --version
icc (ICC) 15.0.2 20150121
Copyright (C) 1985-2015 Intel Corporation. All rights reserved.
Swapping num_weights and weights0 in the pair_struct solves the problem. As @lgarrison noted in the github issue, the ICE must be related to alignment requirements.
Please let me know if you need any further info.
Thanks,
Manodeep Sinha
