lots of instructions only exist for RA, so RA can garbage collect them before
post-RA passes (including the JIT) deals with them. this simplifies our life
now, and makes post-RA passes a LOT simpler for little cost.
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Beyond the actual registers allocated, there are two pieces of sideband data we
store in the RAData object:
* # of spill slots (explicitly)
* whether RA has run (implicitly by the existence of RAData)
We want to get rid of RAData, so we'll move these to the header.
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
nothing else does this, and it complicates upcoming refactor to move away from
IR builder helpers doing IR dereferencing.
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
FEAT_ECV added a new synchronizing cycle counter instruction that
restrict speculation across the cycle counter access. Because it
restricts speculation, it effectively acts like an isb and load dsb.
Luckily for us, this actually matches behaviour for what rdtscp does, so
we can take advantage of it if the host supports FEAT_ECV.
3DNow Reciprocal estimations did not have enough accuracy. Tests were enabled
to check for accurate values of reciprocals.
* where needed, reciprocal accuracy was increased.
* 3DNow sqrt reciprocal fixed for negative values.
* New helper VFCopySign IR op added.
Fixes#4319.
```diff
"sha1rnds4 xmm0, xmm1, 10b": {
- "ExpectedInstructionCount": 55,
+ "ExpectedInstructionCount": 10,
```
So I spent a few hours glaring at this instruction. Then spent a few
more glaring in to the sunset and then found the optimization.
Includes tests and instcountci files and tests.
When the x87 optimizations were implement, we missed
optimizing different addressing modes. This commit addresses this issue.
Discussed in #4252.
The IR stores elementsize, where the json was wanting number of
elements. While the IR Emitter function declaration always wanted
element size. This was causing us to do a little dance from ElementSize
-> Number of elements -> ElementSize. Just pass the ElementSize directly
instead of this bogus little dance.
NFC
Finally converts the IR operations themselves to store the OpSize for
the IR operation size and element sizes.
This also finally, FINALLY, converts that remaining `_Constant` helper
to stop using a size field that is specified in bits rather than bytes
like all the other IR op handlers. That thing was so confusing and now
it's gone.
Alyssa Rosenzweig