amd64 

Is equivalent to -m64 -xarch=sse2 (Solaris only). Legacy makefiles and scripts that use -xarch=amd64 to obtain the 64-bit memory model need only use -m64.

amd64a 

Is equivalent to -m64 -xarch=sse2a (Solaris only).

generic

Uses the instruction set common to most processors. This is the default. 

generic64

Compile for good performance on most 64-bit platforms. (Solaris only). 

This option is equivalent to -m64 -xarch=generic and is provided for compatibility with earlier releases. Use -m64 to specify 64-bit compilation instead of -xarch=generic64.

native

Compile for good performance on this system. The compiler chooses the appropriate setting for the current system processor it is running on. 

native64

Compile for good performance on this system (Solaris only). This option is equivalent to -m64 -xarch=native and is provided for compatibility with earlier releases.

pentium_pro

Limits the instruction set to the 32–bit pentium_pro architecture. 

pentium_proa

Adds the AMD extensions (3DNow!, 3DNow! extensions, and MMX extensions) to the 32-bit pentium_pro architecture. 

sse

Adds the SSE instruction set to the pentium_pro architecture.

ssea

Adds the AMD extensions (3DNow!, 3DNow! extensions, and MMX extensions) to the 32-bit SSE architecture. 

sse2

Adds the SSE2 instruction set to the pentium_pro architecture.

sse2a

Adds the AMD extensions (3DNow!, 3DNow! extensions, and MMX extensions) to the 32-bit SSE2 architecture. 

sse3

Adds the SSE3 instruction set to SSE2 instruction set.