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Arithmetic tests needs to be updated for advanced compiler optimization
Hi,
I was trying to build Linux Benchmarks with latest Intel C++ Compiler. When I used -ipo (inter-procedural optimization) option, arithmetic test (arith.c) failed on execution. The problem is Intel compiler's advanced optimization option (-ipo) optimizes much more than expected and this results in elimination of some part of code. /------------------------------------------------- ++iter; /* the loop calls a function to insure that something is done the results of the function are fed back in (just so they they won't be thrown away. A loop with unused assignments may get optimized out of existence */ result = dumb_stuff(result); /-------------------------------------------------------- This part gets eliminated becuase of IPO. Steps to reproduce: $icc -o ./pgms/arithoh -DTIME -O3 -xW -ipo -static -unroll -Darithoh ./src/arith.c $./pgms/arithoh 1 0 loops and this results in divide by zero error. Regards, CP |
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