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e494df2ee6
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.
52 lines
1.1 KiB
Plaintext
52 lines
1.1 KiB
Plaintext
// RUN: %empty-directory(%t)
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// Ensure that serialized sib can be deserialized correctly assuming
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// contents of SIL_INDEX_BLOCK are sorted by their ids
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// RUN: %target-swift-frontend -emit-sib %s -module-name test -o %t/test.sib
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// RUN: %target-swift-frontend -emit-sil %t/test.sib -module-name test
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// CHECK-DAG: sil_vtable
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// CHECK-DAG: sil_global
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// CHECK-DAG: sil_witness_table
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// CHECK-DAG: sil_default_witness_table
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// CHECK-DAG: sil_property
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sil_stage canonical
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import Builtin
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import Swift
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// For SIL_FUNC_NAMES
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sil @id : $@convention(thin) (Float) -> Float {
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bb0(%0 : $Float):
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return %0 : $Float
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}
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// For SIL_VTABLE_NAMES
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class C {}
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sil_vtable C {}
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// For SIL_GLOBALVAR_NAMES
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sil_global @x : $Int
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// For SIL_WITNESS_TABLE_NAMES
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protocol P1 {}
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struct S : P1 {}
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sil_witness_table S: P1 module test {}
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// For SIL_DEFAULT_WITNESS_TABLE_NAMES
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protocol P2 {}
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sil_default_witness_table P2 {}
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// For SIL_PROPERTY_OFFSETS
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struct A {
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var a: Int
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}
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sil_property #A.a ()
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// For SIL_DIFFERENTIABILITY_WITNESS_NAMES
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sil_differentiability_witness [reverse] [parameters 0] [results 0] @id : $@convention(thin) (Float) -> Float {}
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