Instructs the compiler to analyze the program to determine if there are 64-bit pointers that can be safely shrunk into 32-bit pointers and if there are 64-bit longs (on Linux* OS) that can be safely shrunk into 32-bit longs.
Intel® 64 architecture
Linux and Mac OS X: | -auto-ilp32 |
Windows: | /Qauto-ilp32 |
None
OFF |
The optimization is not attempted. |
This option instructs the compiler to analyze the program to determine if there are 64-bit pointers that can be safely shrunk into 32-bit pointers and if there are 64-bit longs (on Linux* OS) that can be safely shrunk into 32-bit longs.
For this option to be effective, the compiler must be able to optimize using the -ipo (Linux OS and Mac OS X) or /Qipo (Windows OS) option and must be able to analyze all library calls or external calls the program makes. This option has no effect on Linux* systems unless you specify setting SSE3 or higher for option -x (Linux and Mac OS X).
This option requires that the size of the program executable never exceeds 232 bytes and all data values can be represented within 32 bits. If the program can run correctly in a 32-bit system, these requirements are implicitly satisfied. If the program violates these size restrictions, unpredictable behavior may occur.
None
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