>Number:         9757
>Category:       target
>Synopsis:       Gcc should use swp instruction in ARM targets
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          pessimizes-code
>Submitter-Id:   net
>Arrival-Date:   Wed Feb 19 16:56:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Tamás Gergely
>Release:        gcc version 3.3 20030210 (prerelease)
>Organization:
>Environment:
BUILD & HOST: Linux 2.4.20 i686 unknown
TARGET: arm-unknown-elf
>Description:
Swp instruction is not used at all in ARM target. Subsequent "LDR rA, [rB]; STR rC, [rB];" instructions could be done with one swp instruction: "SWP rA, rC, [rB]" if rA!=rC. The swp also works, and exchanges register and memory content, if rA=rC.
>How-To-Repeat:

>Fix:
arm.md should be extended?
>Release-Note:
>Audit-Trail:
>Unformatted: