Improving Performance with Interprocedural Optimization
The compiler may be able to perform additional optimizations if it is able to optimize across source line boundaries. These may include, but are not limited to, function inlining. This is enabled with the -ipo option.
Recompile the program using the -ipo option to enable interprocedural optimization.
ifort -real-size 64 -qopt-report=2 -qopt-report-phase=vec -D ALIGNED -ipo matvec.f90 driver.f90 -o MatVector
Note that the vectorization messages now appear at the point of inlining in driver.f90 (line 70) and this is found in the file ipo_out.optrpt.
LOOP BEGIN at driver.f90(73,16) remark #15541: loop was not vectorized: inner loop was already vectorized LOOP BEGIN at matvec.f90(32,3) inlined into driver.f90(70,14) remark #15398: loop was not vectorized: loop was transformed to memset or memcpy LOOP END LOOP BEGIN at matvec.f90(33,3) inlined into driver.f90(70,14) remark #15541: loop was not vectorized: inner loop was already vectorized LOOP BEGIN at matvec.f90(38,6) inlined into driver.f90(70,14) remark #15399: vectorization support: unroll factor set to 4 remark #15300: LOOP WAS VECTORIZED LOOP END LOOP END LOOP END
Now, run the executable and record the execution time.
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