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ea3eee9885
Migrate some of the validation logic over to use the results of behavior analysis. The most significant changes are: * Unreachable-statements now consider merge-points of control flow. For example, if all branches of a if-statement or switch-statement either return or discard, the next statement will be considered unreachable. * Unreachable statements are no longer an error, but a warning. See https://github.com/gpuweb/gpuweb/issues/2378. * Statements that follow a loops that does not break, or have a conditional will now be considered unreachable. * Unreachable statements produced by the SPIR-V reader are now removed using the new RemoveUnreachableStatements transform. Some other new changes include additional validation for the continuing block for for-loops, to match the rules of a loop continuing block. The new cases this validation is testing for are not expressible in WGSL, but some transforms may produce complex continuing statements that might violate these rules. All the writers are able to decay these complex for-loop continuing statements to regular loops. Bug: tint:1302 Change-Id: I0d8a48c73d5d5c30a1cddf92cc3383a692a58e61 Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/71500 Kokoro: Kokoro <noreply+kokoro@google.com> Reviewed-by: David Neto <dneto@google.com>
63 lines
3.1 KiB
Markdown
63 lines
3.1 KiB
Markdown
# Tint changes during Origin Trial
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## Changes for M98
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### Breaking Changes
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* Taking the address of a vector component is no longer allowed.
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* Module-scope declarations can no longer alias a builtin name. [tint:1318](https://crbug.com/tint/1318)
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* It is now an error to call a function either directly or transitively, from a loop continuing block, that uses `discard`. [tint:1302](https://crbug.com/tint/1302)
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### Deprecated Features
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* The `isNan()`, `isInf()`, `isFinite()` and `isNormal()` builtins has been deprecated and will be removed in M101. [tint:1312](https://crbug.com/tint/1312)
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### New Features
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* Shadowing is now fully supported. [tint:819](https://crbug.com/tint/819)
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* The `dot()` builtin now supports integer vector types.
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* Identifiers can now start with a single leading underscore. [tint:1292](https://crbug.com/tint/1292)
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* Control flow analysis has been improved, and functions no longer need to `return` if the statement is unreachable. [tint:1302](https://crbug.com/tint/1302)
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* Unreachable statements now produce a warning instead of an error, to allow WGSL code to be updated to the new analysis behavior. These warnings may become errors in the future [gpuweb#2378](https://github.com/gpuweb/gpuweb/issues/2378)
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### Fixes
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* Fixed an issue where using a module-scoped `let` in a `workgroup_size` may result in a compilation error. [tint:1320](https://crbug.com/tint/1320)
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## Changes for M97
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### Breaking Changes
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* Deprecated `modf()` and `frexp()` builtin overloads that take a pointer second parameter have been removed.
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* Deprecated texture builtin functions that accepted a `read` access controlled storage texture have been removed.
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* Storage textures must now only use the `write` access control.
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### Deprecated Features
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* The `ignore()` builtin has been replaced with phony-assignment. [gpuweb#2127](https://github.com/gpuweb/gpuweb/pull/2127)
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### New Features
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* `any()` and `all()` now support a `bool` parameter. These simply return the passed argument. [tint:1253](https://crbug.com/tint/1253)
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* Call statements may now include functions that return a value (`ignore()` is no longer needed).
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* The `interpolate(flat)` attribute can now be specified on integral user-defined IO. It will eventually become an error to define integral user-defined IO without this attribute.
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* Matrix construction from scalar element values is now supported.
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### Fixes
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* Swizzling of `vec3` types in `storage` and `uniform` buffers has been fixed for Metal 1.x. [tint:1249](https://crbug.com/tint/1249)
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* Calling a function that returns an unused value no longer produces an FXC compilation error. [tint:1259](https://crbug.com/tint/1259)
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## Changes for M95
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### New Features
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* The size of an array can now be defined using a non-overridable module-scope constant
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* The `num_workgroups` builtin is now supported.
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### Fixes
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* Hex floats: now correctly errors when the magnitude is non-zero, and the exponent would cause overflow. [tint:1150](https://crbug.com/tint/1150), [tint:1166](https://crbug.com/tint/1166)
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* Identifiers beginning with an underscore are now correctly rejected. [tint:1179](https://crbug.com/tint/1179)
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* `abs()` fixed for unsigned integers on SPIR-V backend
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