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Compiler version and platform:
Intel(R) C Intel(R) 64 Compiler for applications running on Intel(R) 64, Version 17.0.1.132 Build 20161005
$ icc -O0 small.c; ./a.out $ $ icc -O1 small.c $ ./a.out Floating point exception (core dumped) $ $ cat small.c volatile struct S { int f:4; } b; int a, c = 1, d; int main () { for (; a < 2; a++) { for (; d < 1; d++) b.f = 1; b.f = 0 % b.f - 1; if (!(c && b.f < 0)) b.f = 0; } return 0; } $
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