[Qemu-devel] [Bug 595906] Re: [ARM] All variants of ADDSUBX, SUBADDX give incorrect results

[cmchao]

The addsub/subadd implemetation is incorrect.  The patch can fixed it
and is verified by Chris's test case


** Patch added: "target-arm: fix addsub/subadd implementation"
   
http://launchpadlibrarian.net/50552359/0001-target-arm-fix-addsub-subadd-implementation.patch

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[ARM] All variants of ADDSUBX,SUBADDX give incorrect results
https://bugs.launchpad.net/bugs/595906
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Status in QEMU: New

Bug description:
All variants of the ADDSUBX/SUBADDX instructions seem to be implemented 
incorrectly, i.e.

    MOV r12, #0
    LDR r0, =0x18004800
    LDR r1, =0x30006000
    QADDSUBX r12, r0, r1    ; Should give 0x78001800 - gives 0x4800e800

This happens with latest git HEAD.