Optimize application performance for systems using IA-32 architecture
and Intel® 64 architecture.
These options have been deprecated.
Windows: Optimization
> Optimize For Intel(R) Processor (/GB, /G5,
/G6, /G7)
Linux: None
Mac OS: None
IA-32 architecture, Intel® 64 architecture
| Linux: | None |
| Mac OS: | None |
| Windows: | /G5 /G6 /G7 |
None
| /G7 | On systems using IA-32 architecture and Intel® 64 architecture, performance is optimized for Intel® Pentium® 4 processors, Intel® Xeon® processors, Intel® Pentium® M processors, and Intel® Pentium® 4 processors with Streaming SIMD Extensions 3 (SSE3) instruction support. |
These options optimize application performance for a particular Intel® processor or family of processors. The compiler generates code that takes advantage of features of the specified processor.
| Option | Description |
|---|---|
| G5 | Optimizes for Intel® Pentium® and Pentium® with MMX™ technology processors. |
| G6 | Optimizes for Intel® Pentium® Pro, Pentium® II and Pentium® III processors. |
| G7 | Optimizes for Intel® Core™ Duo processors, Intel® Core™ Solo processors, Intel® Pentium® 4 processors, Intel® Xeon® processors based on the Intel® Core™ microarchitecture, Intel® Pentium® M processors, and Intel® Pentium® 4 processors with Streaming SIMD Extensions 3 (SSE3) instruction support. |
On systems using Intel® 64 architecture, only option G7 is valid.
These options always generate code that is backwards compatible with Intel processors of the same architecture. For example, code generated with the G7 option runs correctly on Pentium III processors, although performance may be faster on Pentium III processors when compiled using or G6.
Windows: /GB (an alternate for /G6;
this option is also deprecated)
Linux: None
In the following example, the compiled binary of the source program
prog.f
is optimized, by default, for Intel® Pentium® 4 processors, Intel® Xeon®
processors, Intel® Pentium® M processors, and Intel® Pentium® 4 processors
with Streaming SIMD Extensions 3 (SSE3). The same binary will also run
on Pentium, Pentium Pro, Pentium II, and Pentium III processors. All lines
in the code example are equivalent.
ifort prog.f
ifort /G7 prog.f
In the following example, the compiled binary is optimized for Pentium processors and Pentium processors with MMX technology:
ifort /G5 prog.f
mtune compiler option