Add the VulkanMemoryModelDeviceScope capability to the capability
trimming pass. According the the spec, "If the Vulkan memory model is
declared and any instruction uses Device scope, the
VulkanMemoryModelDeviceScope capability must be declared." Since this
case, based on the type of an operand, is not covered by the JSON
grammar, it is added explicitly.
The StorageImageReadWithoutFormat capability is only required when
an image type with the format set to Unknown is used with some specific
OpImageRead or OpImageSparseRead instructions.
This patch adds the required code to the capability trimming pass to
remove the StorageImageReadWithoutFormat capability when not required.
Signed-off-by: Nathan Gauër <brioche@google.com>
From the Capability's text in the SPIRV spec:
```
An MS operand in OpTypeImage indicates multisampled, used with an
OpTypeImage having Sampled == 2 and Arrayed == 1.
```
Adding this logic to the capability trimming pass.
Some operands are not simple values, but bitmasks.
The lookup in the table for required decomposing the mask into
single values.
This commit adds support for such operands, like MinLod|Offset.
* opt: fix StorageInputOutput16 trimming.
While integrating this pass into DXC, I found a lot of missing
cases. This PR fixes a few issues centered around this capability
while laying out fondations for more fixes.
1. The grammar can define extensions in operand & opcode tables.
- opcode can rely on common capabilities, but require a new
extension.
- opcode can also rely on a capability which requires an extension.
Sometimes, the extension is listed twice, in the opcode, and
capability. But this redundancy is not guaranteed.
2. minVersion check. The condition was flipped: we added the extension
when the minVersion was less than current.
Didn't noticed the issue as I only tests on the default env.
3. Capability/Extension instructions were not ignored.
- `OpCapability Foo` will require the `Foo` capability.
- it doesn't mean the module requires the `Foo` capability.
Same for extensions.
This commit adds disabled tests, for fixes which are too large to
be brought into this already large PR.
This commit adds a new optimization which tries to remove unnecessary
capabilities from a SPIR-V module.
When compiling a SPIR-V module, you may have some dead-code using
features gated by a capability.
DCE will remove this code, but the capability will remain. This means
your module would still require some capability, even if it doesn't
require it. Calling this pass on your module would remove obsolete
capabilities.
This pass wouldn't be enabled by default, and would only be usable
from the API (at least for now).
NOTE: this commit only adds the basic skeleton/structure, and
doesn't mark as supported many capabilities it could support.
I'll add them as supported as I write tests.
Signed-off-by: Nathan Gauër <brioche@google.com>
