B.2.79 -xchip[=c] (Sun Studio 12: C User's Guide)

Sun Studio 12: C User's Guide

B.2.79 `-xchip`[`=c`]

Specifies the target processor for use by the optimizer.

c must be one of the following: generic, old, super, super2, micro, micro2, hyper, hyper2, powerup, ultra, ultra2, ultra2e, ultra2i, ultra3, ultra3cu, pentium, pentium_pro.

Although this option can be used alone, it is part of the expansion of the-xtarget option; its primary use is to override a value supplied by the-xtarget option.

This option specifies timing properties by specifying the target processor. Some effects are:

The ordering of instructions, that is, scheduling
The way the compiler uses branches
The instructions to use in cases where semantically equivalent alternatives are available

The following table lists the -xchip values for SPARC platforms:

Table B–19 The SPARC -xchip Flags


Flag	Meaning
`generic`	Use timing properties for good performance on most SPARC architectures. This is the default value that directs the compiler to use the best timing properties for good performance on most processors, without major performance degradation on any of them.
native	Set the parameters for the best performance on the host environment.
`old`	Uses timing properties of pre-SuperSPARC processors.
`sparc64vi`	Optimize for the SPARC64 VI processor.
`super`	Uses timing properties of the SuperSPARC processors.
`super2`	Uses timing properties of the SuperSPARC II processors.
`micro`	Uses timing properties of the microSPARC processors.
`micro2`	Uses timing properties of the microSPARC II processors.
`hyper`	Uses timing properties of the hyperSPARC processors.
`hyper2`	Uses timing properties of the hyperSPARC II processors.
`powerup`	Uses timing properties of the Weitek PowerUp processors.
`ultra`	Uses timing properties of the UltraSPARC processors.
`ultra2`	Uses timing properties of the UltraSPARC II processors.
`ultra2e`	Uses timing properties of the UltraSPARC IIe processors.
`ultra2i`	Uses timing properties of the UltraSPARC IIi processors.
`ultra3`	Uses timing properties of the UltraSPARC III processors.
`ultra3cu`	Uses timing properties of the UltraSPARC III Cu processors.
`ultra3i`	Uses the timing properties of the UltraSPARC IIIi processors.
`ultra4`	Uses timing properties of the UltraSPARC IV processors.
`ultra4plus`	Uses the timing properties of the UltraSPARC IVplus processor.
`ultraT1`	Uses the timing properties of the UltraSPARC T1 processor.
`ultraT2`	Uses the timing properties of the UltraSPARC T2 processor.

The following table lists the -xchip values for the x86 platforms:

Table B–20 The x86 -xchip Flags


Flag	Meaning
`generic`	Use timing properties for good performance on most x86 architectures. This is the default value that directs the compiler to use the best timing properties for good performance on most processors, without major performance degradation on any of them.
`native`	Set the parameters for the best performance on the host environment.
`pentium`	Uses timing properties of the x86 pentium architecture
`pentium_pro`	Uses timing properties of the x86 pentium_pro architecture
`pentium3`	Uses the timing properties of the x86 Pentium 3 architecture.
`pentium4`	Uses the timing properties of the x86 Pentium 4 architecture.