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4 Commits

Author SHA1 Message Date
Richard Wei
e494df2ee6 [AutoDiff] Add differentiability kind to differentiability witnesses and mangle them. 
Differentiability witnesses are now keyed by the original function name, the differentiability kind, and the autodiff config.

Updated SIL syntax:
```
differentiability-kind ::= 'forward' | 'reverse' | 'normal' | 'linear'
sil-differentiability-witness ::=
    'sil_differentiability_witness'
    sil-linkage?
    '[' differentiability-kind ']'
    '[' 'parameters' sil-differentiability-witness-function-index-list ']'
    '[' 'results' sil-differentiability-witness-function-index-list ']'
    generic-parameter-clause?
    sil-function-name ':' sil-type
    sil-differentiability-witness-body?
sil-instruction ::=
    'differentiability_witness_function'
    '[' sil-differentiability-witness-function-kind ']'
    '[' differentiability-kind ']'
    '[' 'parameters' sil-differentiability-witness-function-index-list ']'
    '[' 'results' sil-differentiability-witness-function-index-list ']'
    generic-parameter-clause?
    sil-function-name ':' sil-type
```
```console
sil_differentiability_witness [reverse] [parameters 0 1] [results 0] <T where T: Differentiable> @foo : <T> $(T) -> T
differentiability_witness_function [vjp] [reverse] [parameters 0] [results 0] <T where T: Differentiable> @foo : $(T) -> T
```

New mangling:
```swift
  global ::= global generic-signature? 'WJ' DIFFERENTIABILITY-KIND INDEX-SUBSET 'p' INDEX-SUBSET 'r' // differentiability witness
```
```console
$s13test_mangling3fooyS2f_S2ftFWJrSpSr ---> reverse differentiability witness for test_mangling.foo(Swift.Float, Swift.Float, Swift.Float) -> Swift.Float with respect to parameters {0} and results {0}
```

Resolves rdar://74380324.
 2021-02-17 18:27:42 -05:00
Pavel Yaskevich
8d392b48d0 Revert "[opt] remove trivially dead instructions in mandatory combine" 2020-04-16 10:26:29 -07:00
zoecarver
4cc98f0070 [opt] Remove trivially dead instructions in mandatory combine. 
Failing tests that do not test mandatory combine are updated to skip
the mandatory combine pass. Othere tests are updated to use otherwise
removed values.
 2020-04-14 23:39:11 -07:00
Dan Zheng
a24ea90c95 [AutoDiff] NFC: garden tests. (#30598) 
* Move muliti-functionality SIL tests to test/AutoDiff/SIL.

* Add `with_derivative` clause to `differentiable_function` instructions.

Otherwise, IRGen for test/AutoDiff/SIL/differentiable_function_inst.sil fails on
tensorflow branch because the differentiation transform cannot differentiate
external functions.
 2020-03-23 20:29:33 -07:00