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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 0 $ $ icc -O1 small.c; ./a.out 1 $ $ $ cat small.c int printf (const char *, ...); int a[1]; static char b = 1; int foo () { while (0) while (1) return b; return a[0]; } int main () { printf ("%d\n", foo ()); return 0; } $
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