On Thursday, September 09, 2010, Thomas Reilly wrote:
> MacOS 10.6, valgrind-svn from a couple weeks ago.
> 
> vex x86->IR: unhandled instruction bytes: 0x66 0xF 0xBF 0x44
> ==880== valgrind: Unrecognised instruction at address 0x307dab.
> ...
> ==880== Process terminating with default action of signal 4 (SIGILL)
> ==880==  Illegal opcode at address 0x307DAB
> ==880==    at 0x307DAB: frexp$fenv_access_off (in
> /usr/lib/libSystem.B.dylib)
> 
> Actual instruction:
> 
> 0x97c42dab <frexp$fenv_access_off+107>:       movsww 0x8(%esp),%ax

That sounds really bizarre.  What's wrong with plain "movw 0x8(%esp), %ax"
I wonder.

> 
> I see lots of SIGILL bugs in the bugbase but none for this
> function/instruction.   Should I log a new bug?

Yes, pls do.

J

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