Stream: git-wasmtime

Topic: wasmtime / Issue #1657 Cranelift: support different code ...

view this post on Zulip Wasmtime GitHub notifications bot (May 05 2020 at 00:37):

cfallin opened Issue #1657:

Right now, we do not have a notion of "code model", i.e., a set of definitions for ways in which external symbols are referenced. The code model affects which types of relocations we emit, and which address-generation strategies we use: for example, going through a global offset table (GOT) vs. embedding addresses directly, or using PC-relative addressing modes vs. not, or using instructions with differently-sized displacement limits. The closest concept that we have seems to be the colocated flag on external function references.

Ideally, we would like to add support for this as a global compiler flag so that it can influence codegen.

This came up in #1570; non-x86 architectures (such as AArch64) will need it more urgently as the displacement limits are often lower (e.g., on AArch64, +/- 128MB for calls without going through some sort of indirection or veneer).

view this post on Zulip Wasmtime GitHub notifications bot (Jun 29 2020 at 15:54):

bnjbvr labeled Issue #1657:

Right now, we do not have a notion of "code model", i.e., a set of definitions for ways in which external symbols are referenced. The code model affects which types of relocations we emit, and which address-generation strategies we use: for example, going through a global offset table (GOT) vs. embedding addresses directly, or using PC-relative addressing modes vs. not, or using instructions with differently-sized displacement limits. The closest concept that we have seems to be the colocated flag on external function references.

Ideally, we would like to add support for this as a global compiler flag so that it can influence codegen.

This came up in #1570; non-x86 architectures (such as AArch64) will need it more urgently as the displacement limits are often lower (e.g., on AArch64, +/- 128MB for calls without going through some sort of indirection or veneer).

view this post on Zulip Wasmtime GitHub notifications bot (Jun 29 2020 at 15:55):

github-actions[bot] commented on Issue #1657:

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Last updated: Nov 22 2024 at 16:03 UTC