Visible to Intel only — GUID: GUID-4F6CCA3F-42C1-4DF4-9847-67D43DD9652B
Visible to Intel only — GUID: GUID-4F6CCA3F-42C1-4DF4-9847-67D43DD9652B
mcmodel
Tells the compiler to use a specific memory model to generate code and store data.
Only available on Intel® 64 architecture
Linux: |
-mcmodel=mem_model |
macOS: |
None |
Windows: |
None |
mem_model |
Is the memory model to use. Possible values are:
|
-mcmodel=small |
On systems using Intel® 64 architecture, the compiler restricts code and data to the first 2GB of address space. Instruction Pointer (IP)-relative addressing can be used to access code and data. |
This option tells the compiler to use a specific memory model to generate code and store data. It can affect code size and performance. If your program has global and static data with a total size smaller than 2GB, -mcmodel=small is sufficient. Global and static data larger than 2GB requires-mcmodel=medium or -mcmodel=large. Allocation of memory larger than 2GB can be done with any setting of -mcmodel.
IP-relative addressing requires only 32 bits, whereas absolute addressing requires 64-bits. IP-relative addressing is somewhat faster. So, the small memory model has the least impact on performance.
When you specify option -mcmodel=medium or -mcmodel=large, it sets option -shared-intel. This ensures that the correct dynamic versions of the Intel run-time libraries are used.
If you specify option -static-intel while -mcmodel=medium or -mcmodel=large is set, an error will be displayed.
None
Example
The following example shows how to compile using -mcmodel:
icl -shared-intel -mcmodel=medium -o prog prog.c