445308 - ARM improvements to exit code and assembler macros

Status: VERIFIED WONTFIX

(Tamarin Graveyard :: Tracing Virtual Machine, enhancement)

Description

[Rob Winchell]

Attachment: Improvements to exit code and assembler instructions

Patch from Andrew Booker as ARM for improving ARM exit code and several assembler macro instructions.

Comment 1

[Rob Winchell]

Comments from Andrew:

> This improves the exit code, as follows:
>    - Don't use writeback on LDMIA/STMIA instructions, avoiding the
>      need for a subsequent SUB instruction.
>    - Don't load/store the full set of registers (R1-R4) if we're not
>      going to change all of them.

Comment 2

[Andrew Booker]

Although the patch includes changes for both ARM and Thumb, I've only tested the ARM case.

Comment 3

[Andrew Booker]

Attachment: Improvements to exit code and assembler instructions

Updated patch because previous version does not apply cleanly any more.