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dawn-cmake/docs/origin-trial-changes.md
Ben Clayton ea3eee9885 resolver: Migrate validation to behavior analysis 
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>
2021-12-03 17:51:48 +00:00

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Tint changes during Origin Trial

Changes for M98

Breaking Changes

  • Taking the address of a vector component is no longer allowed.
  • Module-scope declarations can no longer alias a builtin name. tint:1318
  • It is now an error to call a function either directly or transitively, from a loop continuing block, that uses discard. tint:1302

Deprecated Features

  • The isNan(), isInf(), isFinite() and isNormal() builtins has been deprecated and will be removed in M101. tint:1312

New Features

  • Shadowing is now fully supported. tint:819
  • The dot() builtin now supports integer vector types.
  • Identifiers can now start with a single leading underscore. tint:1292
  • Control flow analysis has been improved, and functions no longer need to return if the statement is unreachable. tint:1302
  • 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

Fixes

  • Fixed an issue where using a module-scoped let in a workgroup_size may result in a compilation error. tint:1320

Changes for M97

Breaking Changes

  • Deprecated modf() and frexp() builtin overloads that take a pointer second parameter have been removed.
  • Deprecated texture builtin functions that accepted a read access controlled storage texture have been removed.
  • Storage textures must now only use the write access control.

Deprecated Features

  • The ignore() builtin has been replaced with phony-assignment. gpuweb#2127

New Features

  • any() and all() now support a bool parameter. These simply return the passed argument. tint:1253
  • Call statements may now include functions that return a value (ignore() is no longer needed).
  • 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.
  • Matrix construction from scalar element values is now supported.

Fixes

  • Swizzling of vec3 types in storage and uniform buffers has been fixed for Metal 1.x. tint:1249
  • Calling a function that returns an unused value no longer produces an FXC compilation error. tint:1259

Changes for M95

New Features

  • The size of an array can now be defined using a non-overridable module-scope constant
  • The num_workgroups builtin is now supported.

Fixes

  • Hex floats: now correctly errors when the magnitude is non-zero, and the exponent would cause overflow. tint:1150, tint:1166
  • Identifiers beginning with an underscore are now correctly rejected. tint:1179
  • abs() fixed for unsigned integers on SPIR-V backend