File: sil_differentiability_witness.sil

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// Test round-trip parsing/printing.

// RUN: %target-sil-opt %s | %target-sil-opt -emit-sorted-sil | %FileCheck --check-prefix=ROUNDTRIP %s

// Test round-trip serialization/deserialization.

// RUN: %empty-directory(%t)
// RUN: %target-sil-opt %s -emit-sib -o %t/tmp.sib -module-name main
// RUN: %target-sil-opt %t/tmp.sib -o %t/tmp.sil -module-name main

// https://github.com/apple/swift/issues/54526
// Workaround because import declarations are not preserved in .sib files.
// RUN: sed -e 's/import Swift$/import Swift; import _Differentiation/' %t/tmp.sil > %t/tmp_fixed.sil
// RUN: %target-sil-opt %t/tmp_fixed.sil -module-name main -emit-sorted-sil | %FileCheck --check-prefix=ROUNDTRIP %s

// IRGen test.

// RUN: %target-swift-frontend -emit-ir %s | %FileCheck --check-prefix=IRGEN %s

// `shell` is required only to run `sed` as a
// https://github.com/apple/swift/issues/54526 workaround.
// REQUIRES: shell

sil_stage raw

import Builtin
import Swift
import SwiftShims

import _Differentiation

// Test SIL differentiability witness for bodiless original function, with defined jvp/vjp.

sil @externalFn1 : $@convention(thin) (Float) -> Float

sil @AD__externalFn1__jvp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float) {
bb0(%0 : $Float):
  return undef : $(Float, @callee_guaranteed (Float) -> Float)
}

sil @AD__externalFn1__vjp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float) {
bb0(%0 : $Float):
  return undef : $(Float, @callee_guaranteed (Float) -> Float)
}

sil_differentiability_witness [reverse] [parameters 0] [results 0] @externalFn1 : $@convention(thin) (Float) -> Float {
  jvp: @AD__externalFn1__jvp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float)
  vjp: @AD__externalFn1__vjp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float)
}

// ROUNDTRIP-LABEL: // differentiability witness for externalFn1
// ROUNDTRIP: sil_differentiability_witness{{( public_external)?}} [reverse] [parameters 0] [results 0] @externalFn1 : $@convention(thin) (Float) -> Float {
// ROUNDTRIP:   jvp: @AD__externalFn1__jvp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float)
// ROUNDTRIP:   vjp: @AD__externalFn1__vjp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float)
// ROUNDTRIP: }

// IRGEN-LABEL: @externalFn1WJrSpSr ={{( protected)?}} global { ptr, ptr } {
// IRGEN-SAME: @AD__externalFn1__jvp_src_0_wrt_0
// IRGEN-SAME: @AD__externalFn1__vjp_src_0_wrt_0
// IRGEN-SAME: }

// Test SIL differentiability witness for bodiless original function, with bodiless jvp/vjp.

sil @externalFn2 : $@convention(thin) (Float) -> Float

sil @AD__externalFn2__jvp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float)

sil @AD__externalFn2__vjp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float)

sil_differentiability_witness [reverse] [parameters 0] [results 0] @externalFn2 : $@convention(thin) (Float) -> Float {
  jvp: @AD__externalFn2__jvp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float)
  vjp: @AD__externalFn2__vjp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float)
}

// ROUNDTRIP-LABEL: // differentiability witness for externalFn2
// ROUNDTRIP: sil_differentiability_witness{{( public_external)?}} [reverse] [parameters 0] [results 0] @externalFn2 : $@convention(thin) (Float) -> Float {
// ROUNDTRIP:   jvp: @AD__externalFn2__jvp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float)
// ROUNDTRIP:   vjp: @AD__externalFn2__vjp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float)
// ROUNDTRIP: }

// IRGEN-LABEL: @externalFn2WJrSpSr ={{( protected)?}} global { ptr, ptr } {
// IRGEN-SAME: @AD__externalFn2__jvp_src_0_wrt_0
// IRGEN-SAME: @AD__externalFn2__vjp_src_0_wrt_0
// IRGEN-SAME: }

// Test SIL differentiability witness declaration.

sil @externalFn3 : $@convention(thin) (Float) -> Float

sil_differentiability_witness [reverse] [parameters 0] [results 0] @externalFn3 : $@convention(thin) (Float) -> Float

// ROUNDTRIP-LABEL: // differentiability witness for externalFn3
// ROUNDTRIP: sil_differentiability_witness{{( public_external)?}} [reverse] [parameters 0] [results 0] @externalFn3 : $@convention(thin) (Float) -> Float{{[^{]*$}}

// IRGEN-NOT: @AD__externalFn3{{.*}}={{.*}}{ ptr, ptr }

// Test public non-generic function.
// SIL differentiability witness:
// - Has public linkage (implicit).
// - Has no `where` clause.

sil [ossa] @foo : $@convention(thin) (Float) -> Float {
bb0(%0 : $Float):
  return %0 : $Float
}

sil @AD__foo__jvp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float) {
bb0(%0 : $Float):
  return undef : $(Float, @callee_guaranteed (Float) -> Float)
}

sil @AD__foo__vjp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float) {
bb0(%0 : $Float):
  return undef : $(Float, @callee_guaranteed (Float) -> Float)
}

sil_differentiability_witness [reverse] [parameters 0] [results 0] @foo : $@convention(thin) (Float) -> Float {
  jvp: @AD__foo__jvp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float)
  vjp: @AD__foo__vjp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float)
}

// ROUNDTRIP-LABEL: // differentiability witness for foo
// ROUNDTRIP: sil_differentiability_witness{{( public_external)?}} [reverse] [parameters 0] [results 0] @foo : $@convention(thin) (Float) -> Float {
// ROUNDTRIP:   jvp: @AD__foo__jvp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float)
// ROUNDTRIP:   vjp: @AD__foo__vjp_src_0_wrt_0 : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float)
// ROUNDTRIP: }

// IRGEN-LABEL: @fooWJrSpSr ={{( protected)?}} global { ptr, ptr } {
// IRGEN-SAME: @AD__foo__jvp_src_0_wrt_0
// IRGEN-SAME: @AD__foo__vjp_src_0_wrt_0
// IRGEN-SAME: }

// Test internal generic function.
// SIL differentiability witness:
// - Has hidden linkage.
// - Has `where` clause.

sil hidden [ossa] @generic : $@convention(thin) <T> (@in_guaranteed T, Float) -> @out T {
bb0(%0 : $*T, %1 : $*T, %2 : $Float):
  copy_addr %1 to [init] %0 : $*T
  %void = tuple ()
  return %void : $()
}

sil hidden @AD__generic__jvp_src_0_wrt_0_1 : $@convention(thin) <τ_0_0 where τ_0_0 : Differentiable> (@in_guaranteed τ_0_0, Float) -> (@out τ_0_0, @owned @callee_guaranteed (@in_guaranteed τ_0_0.TangentVector, Float) -> @out τ_0_0.TangentVector) {
bb0(%0 : $*τ_0_0, %1 : $*τ_0_0, %2 : $Float):
  return undef : $@callee_guaranteed (@in_guaranteed τ_0_0.TangentVector, Float) -> @out τ_0_0.TangentVector
}

sil hidden @AD__generic__vjp_src_0_wrt_0_1 : $@convention(thin) <τ_0_0 where τ_0_0 : Differentiable> (@in_guaranteed τ_0_0, Float) -> (@out τ_0_0, @owned @callee_guaranteed (@in_guaranteed τ_0_0.TangentVector) -> (@out τ_0_0.TangentVector, Float)) {
bb0(%0 : $*τ_0_0, %1 : $*τ_0_0, %2 : $Float):
  return undef : $@callee_guaranteed (@in_guaranteed τ_0_0.TangentVector) -> (@out τ_0_0.TangentVector, Float)
}

sil_differentiability_witness hidden [reverse] [parameters 0 1] [results 0] <τ_0_0 where τ_0_0 : Differentiable> @generic : $@convention(thin) <T> (@in_guaranteed T, Float) -> @out T {
  jvp: @AD__generic__jvp_src_0_wrt_0_1 : $@convention(thin) <τ_0_0 where τ_0_0 : Differentiable> (@in_guaranteed τ_0_0, Float) -> (@out τ_0_0, @owned @callee_guaranteed (@in_guaranteed τ_0_0.TangentVector, Float) -> @out τ_0_0.TangentVector)
  vjp: @AD__generic__vjp_src_0_wrt_0_1 : $@convention(thin) <τ_0_0 where τ_0_0 : Differentiable> (@in_guaranteed τ_0_0, Float) -> (@out τ_0_0, @owned @callee_guaranteed (@in_guaranteed τ_0_0.TangentVector) -> (@out τ_0_0.TangentVector, Float))
}

// ROUNDTRIP-LABEL: // differentiability witness for generic
// ROUNDTRIP: sil_differentiability_witness {{(hidden)|(hidden_external)}} [reverse] [parameters 0 1] [results 0] <τ_0_0 where τ_0_0 : Differentiable> @generic : $@convention(thin) <T> (@in_guaranteed T, Float) -> @out T {
// ROUNDTRIP:   jvp: @AD__generic__jvp_src_0_wrt_0_1 : $@convention(thin) <τ_0_0 where τ_0_0 : Differentiable> (@in_guaranteed τ_0_0, Float) -> (@out τ_0_0, @owned @callee_guaranteed (@in_guaranteed τ_0_0.TangentVector, Float) -> @out τ_0_0.TangentVector)
// ROUNDTRIP:   vjp: @AD__generic__vjp_src_0_wrt_0_1 : $@convention(thin) <τ_0_0 where τ_0_0 : Differentiable> (@in_guaranteed τ_0_0, Float) -> (@out τ_0_0, @owned @callee_guaranteed (@in_guaranteed τ_0_0.TangentVector) -> (@out τ_0_0.TangentVector, Float))
// ROUNDTRIP: }

// IRGEN: @generic16_Differentiation14DifferentiableRzlWJrSSpSr = hidden global { ptr, ptr } {
// IRGEN-SAME: @AD__generic__jvp_src_0_wrt_0_1
// IRGEN-SAME: @AD__generic__vjp_src_0_wrt_0_1
// IRGEN-SAME: }