Now that we're using 32-bit ops for 8/16-bit logical operations
(to avoid partial register stalls), there's really no need to
keep track of the 8/16-bit ops at all. Convert everything we
can to 32-bit ops.
This CL is the obvious stuff. I might think a bit more about
whether we can get rid of weirder stuff like HMULWU.
The only downside to this CL is that we lose some information
about constants. If we had source like:
var a byte = ...
a += 128
a += 128
We will convert that to a += 256, when we could get rid of the
add altogether. This seems like a fairly unusual scenario and
I'm happy with forgoing that optimization.
Change-Id: Ia7c1e5203d0d110807da69ed646535194a3efba1
Reviewed-on: https://go-review.googlesource.com/22382
Reviewed-by: Todd Neal <todd@tneal.org>
Add the aux type to opcodes.
Add rematerializeable as a flag.
Change-Id: I906e19281498f3ee51bb136299bf26e13a54b2ec
Reviewed-on: https://go-review.googlesource.com/19088
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Todd Neal <todd@tneal.org>
Spilling/restoring flag values is a pain to do during regalloc.
Instead, allocate the flag register in a separate pass. Regalloc then
operates normally on any flag recomputation instructions.
Change-Id: Ia1c3d9e6eff678861193093c0b48a00f90e4156b
Reviewed-on: https://go-review.googlesource.com/17694
Reviewed-by: David Chase <drchase@google.com>
Declare a function's arguments as having already been
spilled so their use just requires a restore.
Allow spill locations to be portions of larger objects the stack.
Required to load portions of compound input arguments.
Rename the memory input to InputMem. Use Arg for the
pre-spilled argument values.
Change-Id: I8fe2a03ffbba1022d98bfae2052b376b96d32dda
Reviewed-on: https://go-review.googlesource.com/16536
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Failure to treat control ops as live can lead
to them being eliminated when they live in
other blocks.
Change-Id: I604a1977a3d3884b1f4516bea4e15885ce38272d
Reviewed-on: https://go-review.googlesource.com/13138
Reviewed-by: Keith Randall <khr@golang.org>
