Recently I've been playing with CVS qemu-system (softmmu) on amd64 and had some stability problems. I decided to run Valgrind's amd64 instruction-set tests (derived from qemu's) to see if they picked up anything. Resulting diffs are attached.
There are a bunch of differences for the C flag for rotates (rol/ror) by multiples of the word size. I don't think these are significant, but who knows. Perhaps more worryingly are the 20 or so lines at the bottom of the diff. These I believe are for double-to-int/short conversions for a value which is out of range for an int/short; the hardware produces 0x80000000/0x8000 respectively, which is the "integer indefinite"; QEMU produces zero. I can imagine some obscure routine somewhere checking for integer indefinite after conversion and being confused as a result. J
diffs-qemu-vs-Athlon64.txt.bz2
Description: BZip2 compressed data
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