Stream: git-cranelift

Topic: cranelift / Issue #1348 Replace temporary lowering of Was...

view this post on Zulip GitHub (Jan 14 2020 at 23:29):

abrown opened Issue #1348:

What is the feature or code improvement you would like to do in Cranelift?

In #1347 I added a temporary lowering for Wasm's load_splat to two Cranelift instructions, load + splat. This generates extra instructions that could be removed by a specialized Cranelift load_splat instruction or by smarter codegen (e.g. complex addressing on splat).

What is the value of adding this in Cranelift?

Fewer instructions produced.

Do you have an implementation plan, and/or ideas for data structures or algorithms to use?

Seeking feedback on which way to proceed: specialized load_splat or smarter codegen.

Have you considered alternative implementations? If so, how are they better or worse than your proposal?

See above.

view this post on Zulip GitHub (Jan 14 2020 at 23:34):

abrown edited Issue #1348:

What is the feature or code improvement you would like to do in Cranelift?

In #1347 I added a temporary lowering for Wasm's load_splat to two Cranelift instructions, load + splat. This generates extra instructions that could be removed by a specialized Cranelift load_splat instruction or by smarter codegen (e.g. complex addressing on splat).

What is the value of adding this in Cranelift?

Fewer instructions produced.

Do you have an implementation plan, and/or ideas for data structures or algorithms to use?

Seeking feedback on which way to proceed: specialized load_splat or smarter codegen.

Have you considered alternative implementations? If so, how are they better or worse than your proposal?

See above.

view this post on Zulip GitHub (Jan 14 2020 at 23:35):

abrown commented on Issue #1348:

@sunfishcode, I wonder if the load-from-constant-table questions I was asking also relate to this (in regard to the complex addressing).

view this post on Zulip GitHub (Feb 28 2020 at 23:28):

alexcrichton transferred Issue #1348:

What is the feature or code improvement you would like to do in Cranelift?

In #1347 I added a temporary lowering for Wasm's load_splat to two Cranelift instructions, load + splat. This generates extra instructions that could be removed by a specialized Cranelift load_splat instruction or by smarter codegen (e.g. complex addressing on splat).

What is the value of adding this in Cranelift?

Fewer instructions produced.

Do you have an implementation plan, and/or ideas for data structures or algorithms to use?

Seeking feedback on which way to proceed: specialized load_splat or smarter codegen.

Have you considered alternative implementations? If so, how are they better or worse than your proposal?

See above.

Last updated: Dec 06 2025 at 05:03 UTC