Request for review(XXS): 6946892 c1 shouldn't sign-extend to upper 32bits on x64

Tom Rodriguez tom.rodriguez at
Mon Apr 26 12:16:27 PDT 2010

This looks good.  Have you tested the 64 bit client much after this change?  The sign extension here could be hiding some missing sign extension at the LIR level.


On Apr 23, 2010, at 9:13 PM, Igor Veresov wrote:

> C1 does sign-extension when it loads ints and shorts from memory to 64-bit registers. This causes problems for C2 because it relies on the fact the int passed in a 64-bit register is zero-extended.
> Webrev:
> Thanks,
> igor

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