re PR rtl-optimization/11536 ([strength-reduce] -O2 optimalization produces wrong code)
PR optimization/11536 * unroll.c (loop_iterations): Do not replace a register holding the final value by its equivalent before the loop if it is not invariant. PR optimization/11536 * gcc.dg/20030721-1.c: New test. From-SVN: r69635
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gcc/testsuite/gcc.dg/20030721-1.c
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