Vectorizer Options
| Option |
Description |
| -ax{K|W|N|B|P} |
Enables the vectorizer and generates specialized and generic IA-32
code. The generic code is usually slower than the specialized code. |
| -x{K|W|N|B|P} |
Turns on the vectorizer and generates processor-specific specialized
code. |
| -vec_reportn |
Controls the vectorizer's level of diagnostic messages:
- n =0 no
diagnostic information is displayed.
- n =1 display
diagnostics indicating loops successfully vectorized (default).
- n =2 same
as n =1,
plus diagnostics indicating loops not successfully vectorized.
- n =3 same
as n =2, plus additional information
about any proven or assumed dependences.
|
Usage
If you use -c, -ipo
with -vec_report{n} option or -c,
-x{K|W|N|B|P} or -ax{K|W|N|B|P}
with -vec_report{n}, the compiler issues a warning
and no report is generated.
To produce a report when using the aforementioned options, you need
to add the -ipo_obj option. The combination of
-c and -ipo_obj produces
a single file compilation, and hence does generate object code, and eventually
a report is generated.
The following commands generate a vectorization report:
- prompt>icpc -x{K|W|N|B|P} -vec_report3 file.cpp
- prompt>icpc -x{K|W|N|B|P} -ipo -ipo_obj -vec_report3
file.cpp
- prompt>icpc -c -x{K|W|N|B||P} -ipo -ipo_obj -vec_report3
file.cpp
The following commands do not generate a vectorization report:
- prompt>icpc -c -x{K|W|M|B|P} -vec_report3 file.cpp
- prompt>icpc -x{K|W|N|B|P} -ipo -vec_report3 file.cpp
- prompt>icpc -c -x{K|W|N|B|P} -ipo -vec_report3 file.cpp