optimization/10654: feature request: non-temporal store, 64-bit general purpose register

[scott.duplichan@hp.com]

>Number:         10654
>Category:       optimization
>Synopsis:       feature request: non-temporal store, 64-bit general purpose register
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          support
>Submitter-Id:   net
>Arrival-Date:   Wed May 07 02:46:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     scott duplichan
>Release:        unknown-1.0
>Organization:
>Environment:
all
>Description:
Please forgive me if this is not the place for a feature request.

Feature request: _mm_stream_si64

An intrinsic for non-temporal store of ordinary 64-bit data is needed. IA64, AMD64, and possible others support this natively.

This type of store can achieve a 2X or so performance gain.
>How-To-Repeat:
On a system that supports native 64-bit registers, try to do a non-temporal store without using assembly language.
>Fix:
Implement an intrinsic function that stores a 64-bit general purpose register using a non-temporal store.

>Release-Note:
>Audit-Trail:
>Unformatted: