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Diffstat (limited to 'FutureFeatures.md')
| -rw-r--r-- | FutureFeatures.md | 19 |
1 files changed, 12 insertions, 7 deletions
diff --git a/FutureFeatures.md b/FutureFeatures.md index 8ac622e..67e1468 100644 --- a/FutureFeatures.md +++ b/FutureFeatures.md @@ -79,13 +79,18 @@ Options under consideration: ## Linear memory bigger than 4GiB -WebAssembly will eventually allow a module to have a linear memory size greater than 4GiB by providing -load/store operations that take 64-bit index operands. Modules which opt-in to -this feature have `int64` as the canonical pointer type. - -On a 32-bit system, memory must still be smaller than 4GiB. A WebAssembly -implementation running on such a platform may restrict allocations to the lower -4GiB, and leave the two 32-bits untouched. +WebAssembly will eventually allow a module to have a linear memory size greater +than 4GiB by providing load/store/etc. operations that take 64-bit index +operands. + +Of course, the ability to actually allocate this much memory will always be +subject to dynamic resource availability. + +Initially, it will likely be required that a program use all 32-bit indices or +all 64-bit indices, and not a mix of both, so that implementations don't have +to support both in the same program. However, operators with 32-bit indices and +operations with 64-bit indices will be given separate names to leave open the +possibility of supporting both in the same program in the future. ## Source maps integration |