Description of problem: Gcc creates invalid code from the attached files by essentially trying to dereference an integer as if it were a pointer: movl nonlin@GOT(%ebx), %edi #, movl nlin@GOT(%ebx), %esi #, movl gradf@GOT(%ebx), %edx #, tmp1129 movl (%ecx), %ecx # o8opti_yx, movl $1, -64(%ebp) #, i.5726 movl (%esi), %eax # nlin, nlin movl gres@GOT(%ebx), %esi #, movl %ecx, -168(%ebp) #, movl (%edi), %ecx # nonlin, movl n@GOT(%ebx), %edi #, movl (%edx), %edx # gradf, movl (%esi), %esi # gres, addl %eax, %ecx # nlin, movl (%edi), %edi # n, movl %ecx, -172(%ebp) #, movl %esi, -260(%ebp) #, movl %edx, -264(%ebp) #, addl (%edi), %eax # nonlin, nlin The last line here causes a segmentation fault. The bug only shows up with -fPIC -O2 (or higher). Version-Release number of selected component (if applicable): How reproducible: On suitable code always, but very sensitive to global characteristics of the code. Steps to Reproduce: 1. Compile the attached files using gcc -g -Wall -fPIC -O2 f1.c f2.c 2. Run the resulting a.out (optionally under gdb) Actual results: Segmentation fault on line 974 of f1.c, which is: for (i = 1 ; i <= n ; i++) Expected results: Program runs without problems Additional info: The test case is rather long, because the bug is very evasive. Even removing code long after the affected location will often make the bug disappear.
Created attachment 267611 [details] First demonstration file
Created attachment 267621 [details] Second demonstration file
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