`pxor` is a zero-uop register-rename and `gf2p8affineqb dest, zero, int8`
is a very quick single-instruction way to use affine galois
transformations to fill a register with an immediate byte without
touching memory.
The pkg_config helper for premake was not checking for errors. When it
failed to run, either when it is not installed or the queried package is
not found, a cryptic error message would be printed:
"Error: .../xenia/third_party/premake-core/src/base/string.lua:36: attempt to index a nil value (upvalue 's')"
Fix this by checking the return status when calling pkg-config and
printing a descriptive error message.
Edit one of the lanes in this unit-test to be larger than the width of
the element-size to ensure that this case is handled correctly.
It should only mask the lower `log2(32)=5` bits of the input, causing
`33`(`100001`) to be `1`(`000001`).
`vprolvd` is an almost 1:1 analog with this opcode and can be
conditionally emitted when the host supports AVX512{F,VL}.
Altivec docs say that `vrl{bhw}` masks the lower log2(n) bits of the
element-size.
[vprold](https://www.felixcloutier.com/x86/vprold:vprolvd:vprolq:vprolvq)
modulos the shift-value by the element size in bits, which is the same
as masking the lower log2(n) bits. So `vrlw` maps exactly to `vprold`.
Since timer_delete does not clean up already queued signals, signal info
data needs to be retained after timer deletion and object destruction in
order to circumvent use-after-free bugs.
Schedule callbacks whith the only guarantee that they will not be run for
the minimum duration specified. Useful for garbage collecting POSIX
timer_create() signal info data.
- Mainly use `assert`s, since failure is very rare
- Forward failure of `CreateSemaphore` to guests because it is more easy
to trigger with invalid initial parameters.
Timing dependencies in this tests were causing spurious test failures:
- Create and Run Thread
- Test Thread QueueUserCallback
They have been largely replaced by spin waits.
- Never use `cond_.notify_one()` because it may wake a thread that is
unrelated to the signalled wait handle, resulting in a lost wake and
possible deadlock. Wait conditions are to be checked by the threads
themselves.
- Refactor and simplify `WaitMultiple`
Joel Linn