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|
// RUN: %target-swift-frontend -emit-sil -verify -Xllvm -debug-only=differentiation 2>&1 %s | %FileCheck %s -check-prefix=CHECK-DATA-STRUCTURES
// RUN: %target-swift-frontend -emit-sil -verify -Xllvm -sil-print-after=differentiation -o /dev/null 2>&1 %s | %FileCheck %s -check-prefix=CHECK-SIL
// REQUIRES: asserts
// TODO: Add FileCheck tests.
import _Differentiation
//===----------------------------------------------------------------------===//
// Conditionals
//===----------------------------------------------------------------------===//
@differentiable(reverse)
@_silgen_name("cond")
func cond(_ x: Float) -> Float {
if x > 0 {
return x + x
}
return x - x
}
()
// CHECK-DATA-STRUCTURES-LABEL: Generated linear map tuples and branching trace enums for @cond
// CHECK-DATA-STRUCTURES: ()
// CHECK-DATA-STRUCTURES: (predecessor: _AD__cond_bb1__Pred__src_0_wrt_0, (Float) -> (Float, Float))
// CHECK-DATA-STRUCTURES: (predecessor: _AD__cond_bb2__Pred__src_0_wrt_0, (Float) -> (Float, Float))
// CHECK-DATA-STRUCTURES: (predecessor: _AD__cond_bb3__Pred__src_0_wrt_0)
// CHECK-DATA-STRUCTURES: enum _AD__cond_bb0__Pred__src_0_wrt_0 {
// CHECK-DATA-STRUCTURES: }
// CHECK-DATA-STRUCTURES: enum _AD__cond_bb1__Pred__src_0_wrt_0 {
// CHECK-DATA-STRUCTURES: case bb0(())
// CHECK-DATA-STRUCTURES: }
// CHECK-DATA-STRUCTURES: enum _AD__cond_bb2__Pred__src_0_wrt_0 {
// CHECK-DATA-STRUCTURES: case bb0(())
// CHECK-DATA-STRUCTURES: }
// CHECK-DATA-STRUCTURES: enum _AD__cond_bb3__Pred__src_0_wrt_0 {
// CHECK-DATA-STRUCTURES: case bb2((predecessor: _AD__cond_bb2__Pred__src_0_wrt_0, (Float) -> (Float, Float)))
// CHECK-DATA-STRUCTURES: case bb1((predecessor: _AD__cond_bb1__Pred__src_0_wrt_0, (Float) -> (Float, Float)))
// CHECK-DATA-STRUCTURES: }
// CHECK-SIL-LABEL: sil hidden [ossa] @condTJrSpSr : $@convention(thin) (Float) -> (Float, @owned @callee_guaranteed (Float) -> Float) {
// CHECK-SIL: bb0([[INPUT_ARG:%.*]] : $Float):
// CHECK-SIL: [[BB0_PB_STRUCT:%.*]] = tuple ()
// CHECK-SIL: cond_br {{%.*}}, bb1, bb2
// CHECK-SIL: bb1:
// CHECK-SIL: [[BB1_PRED:%.*]] = enum $_AD__cond_bb1__Pred__src_0_wrt_0, #_AD__cond_bb1__Pred__src_0_wrt_0.bb0!enumelt, [[BB0_PB_STRUCT]]
// CHECK-SIL: [[BB1_PB_STRUCT:%.*]] = tuple $(predecessor: _AD__cond_bb1__Pred__src_0_wrt_0, @callee_guaranteed (Float) -> (Float, Float)) ([[BB1_PRED]]
// CHECK-SIL: [[BB3_PRED_PRED1:%.*]] = enum $_AD__cond_bb3__Pred__src_0_wrt_0, #_AD__cond_bb3__Pred__src_0_wrt_0.bb1!enumelt, [[BB1_PB_STRUCT]]
// CHECK-SIL: br bb3({{.*}} : $Float, [[BB3_PRED_PRED1]] : $_AD__cond_bb3__Pred__src_0_wrt_0)
// CHECK-SIL: bb2:
// CHECK-SIL: [[BB2_PRED:%.*]] = enum $_AD__cond_bb2__Pred__src_0_wrt_0, #_AD__cond_bb2__Pred__src_0_wrt_0.bb0!enumelt, [[BB0_PB_STRUCT]]
// CHECK-SIL: [[BB2_PB_STRUCT:%.*]] = tuple $(predecessor: _AD__cond_bb2__Pred__src_0_wrt_0, @callee_guaranteed (Float) -> (Float, Float)) ([[BB2_PRED]]
// CHECK-SIL: [[BB3_PRED_PRED2:%.*]] = enum $_AD__cond_bb3__Pred__src_0_wrt_0, #_AD__cond_bb3__Pred__src_0_wrt_0.bb2!enumelt, [[BB2_PB_STRUCT]]
// CHECK-SIL: br bb3({{.*}} : $Float, [[BB3_PRED_PRED2]] : $_AD__cond_bb3__Pred__src_0_wrt_0)
// CHECK-SIL: bb3([[ORIG_RES:%.*]] : $Float, [[BB3_PRED_ARG:%.*]] : @owned $_AD__cond_bb3__Pred__src_0_wrt_0)
// CHECK-SIL: [[PULLBACK_REF:%.*]] = function_ref @condTJpSpSr
// CHECK-SIL: [[PB:%.*]] = partial_apply [callee_guaranteed] [[PULLBACK_REF]]([[BB3_PRED_ARG]])
// CHECK-SIL: [[VJP_RESULT:%.*]] = tuple ([[ORIG_RES]] : $Float, [[PB]] : $@callee_guaranteed (Float) -> Float)
// CHECK-SIL: return [[VJP_RESULT]]
// CHECK-SIL-LABEL: sil private [ossa] @condTJpSpSr : $@convention(thin) (Float, @owned _AD__cond_bb3__Pred__src_0_wrt_0) -> Float {
// CHECK-SIL: bb0([[SEED:%.*]] : $Float, [[BB3_PRED:%.*]] : @owned $_AD__cond_bb3__Pred__src_0_wrt_0):
// CHECK-SIL: switch_enum [[BB3_PRED]] : $_AD__cond_bb3__Pred__src_0_wrt_0, case #_AD__cond_bb3__Pred__src_0_wrt_0.bb2!enumelt: bb1, case #_AD__cond_bb3__Pred__src_0_wrt_0.bb1!enumelt: bb3
// CHECK-SIL: bb1([[BB3_PRED2_TRAMP_PB_STRUCT:%.*]] : @owned $(predecessor: _AD__cond_bb2__Pred__src_0_wrt_0, @callee_guaranteed (Float) -> (Float, Float))):
// CHECK-SIL: br bb2({{%.*}} : $Float, {{%.*}}: $Float, [[BB3_PRED2_TRAMP_PB_STRUCT]] : $(predecessor: _AD__cond_bb2__Pred__src_0_wrt_0, @callee_guaranteed (Float) -> (Float, Float)))
// CHECK-SIL: bb2({{%.*}} : $Float, {{%.*}} : $Float, [[BB2_PB_STRUCT:%.*]] : @owned $(predecessor: _AD__cond_bb2__Pred__src_0_wrt_0, @callee_guaranteed (Float) -> (Float, Float))):
// CHECK-SIL: ([[BB2_PRED:%.*]], [[BB2_PB:%.*]]) = destructure_tuple [[BB2_PB_STRUCT]]
// CHECK-SIL: [[BB2_ADJVALS:%.*]] = apply [[BB2_PB]]([[SEED]]) : $@callee_guaranteed (Float) -> (Float, Float)
// CHECK-SIL: switch_enum [[BB2_PRED]] : $_AD__cond_bb2__Pred__src_0_wrt_0, case #_AD__cond_bb2__Pred__src_0_wrt_0.bb0!enumelt: bb6
// CHECK-SIL: bb3([[BB3_PRED1_TRAMP_PB_STRUCT:%.*]] : @owned $(predecessor: _AD__cond_bb1__Pred__src_0_wrt_0, @callee_guaranteed (Float) -> (Float, Float))):
// CHECK-SIL: br bb4({{%.*}} : $Float, {{%.*}}: $Float, [[BB3_PRED1_TRAMP_PB_STRUCT]] : $(predecessor: _AD__cond_bb1__Pred__src_0_wrt_0, @callee_guaranteed (Float) -> (Float, Float)))
// CHECK-SIL: bb4({{%.*}} : $Float, {{%.*}} : $Float, [[BB1_PB_STRUCT:%.*]] : @owned $(predecessor: _AD__cond_bb1__Pred__src_0_wrt_0, @callee_guaranteed (Float) -> (Float, Float))):
// CHECK-SIL: ([[BB1_PRED:%.*]], [[BB1_PB:%.*]]) = destructure_tuple [[BB1_PB_STRUCT]]
// CHECK-SIL: [[BB1_ADJVALS:%.*]] = apply [[BB1_PB]]([[SEED]]) : $@callee_guaranteed (Float) -> (Float, Float)
// CHECK-SIL: switch_enum [[BB1_PRED]] : $_AD__cond_bb1__Pred__src_0_wrt_0, case #_AD__cond_bb1__Pred__src_0_wrt_0.bb0!enumelt: bb5
// CHECK-SIL: bb5([[BB1_PRED0_TRAMP_PB_STRUCT:%.*]] : $()):
// CHECK-SIL: br bb7({{%.*}} : $Float, [[BB1_PRED0_TRAMP_PB_STRUCT]] : $())
// CHECK-SIL: bb6([[BB2_PRED0_TRAMP_PB_STRUCT:%.*]] : $()):
// CHECK-SIL: br bb7({{%.*}} : $Float, [[BB2_PRED0_TRAMP_PB_STRUCT]] : $())
// CHECK-SIL: bb7({{%.*}} : $Float, [[BB0_PB_STRUCT:%.*]] : $()):
// CHECK-SIL: return {{%.*}} : $Float
@differentiable(reverse)
@_silgen_name("nested_cond")
func nested_cond(_ x: Float, _ y: Float) -> Float {
if x > 0 {
if y > 10 {
return x * y
} else {
return x + y
}
}
return y - x
}
@differentiable(reverse)
@_silgen_name("nested_cond_generic")
func nested_cond_generic<T : Differentiable & FloatingPoint>(_ x: T, _ y: T) -> T {
if x > 0 {
if y > 10 {
return y
} else {
return x
}
}
return y
}
@differentiable(reverse)
@_silgen_name("loop_generic")
func loop_generic<T : Differentiable & FloatingPoint>(_ x: T) -> T {
var result = x
for _ in 1..<3 {
var y = x
for _ in 1..<3 {
result = y
y = result
}
}
return result
}
@differentiable(reverse)
@_silgen_name("loop_context")
func loop_context(x: Float) -> Float {
let y = x + 1
for _ in 0 ..< 1 {}
return y
}
// CHECK-DATA-STRUCTURES-LABEL: Generated linear map tuples and branching trace enums for @loop_context:
// CHECK-DATA-STRUCTURES: (_: (Float) -> Float)
// CHECK-DATA-STRUCTURES: (predecessor: _AD__loop_context_bb1__Pred__src_0_wrt_0)
// CHECK-DATA-STRUCTURES: (predecessor: _AD__loop_context_bb2__Pred__src_0_wrt_0)
// CHECK-DATA-STRUCTURES: (predecessor: _AD__loop_context_bb3__Pred__src_0_wrt_0)
// CHECK-DATA-STRUCTURES: enum _AD__loop_context_bb0__Pred__src_0_wrt_0 {
// CHECK-DATA-STRUCTURES: }
// CHECK-DATA-STRUCTURES: enum _AD__loop_context_bb1__Pred__src_0_wrt_0 {
// CHECK-DATA-STRUCTURES: case bb2(Builtin.RawPointer)
// CHECK-DATA-STRUCTURES: case bb0((_: (Float) -> Float))
// CHECK-DATA-STRUCTURES: }
// CHECK-DATA-STRUCTURES: enum _AD__loop_context_bb2__Pred__src_0_wrt_0 {
// CHECK-DATA-STRUCTURES: case bb1(Builtin.RawPointer)
// CHECK-DATA-STRUCTURES: }
// CHECK-DATA-STRUCTURES: enum _AD__loop_context_bb3__Pred__src_0_wrt_0 {
// CHECK-DATA-STRUCTURES: case bb1(Builtin.RawPointer)
// CHECK-DATA-STRUCTURES: }
// CHECK-SIL-LABEL: sil private [ossa] @loop_contextTJpSpSr : $@convention(thin) (Float, @guaranteed Builtin.NativeObject) -> Float {
// CHECK-SIL: bb1([[LOOP_CONTEXT:%.*]] : $Builtin.RawPointer):
// CHECK-SIL: [[PB_TUPLE_ADDR:%.*]] = pointer_to_address [[LOOP_CONTEXT]] : $Builtin.RawPointer to [strict] $*(predecessor: _AD__loop_context_bb1__Pred__src_0_wrt_0)
// CHECK-SIL: [[PB_TUPLE_CPY:%.*]] = load [copy] [[PB_TUPLE_ADDR]] : $*(predecessor: _AD__loop_context_bb1__Pred__src_0_wrt_0)
// CHECK-SIL: br bb3({{.*}} : $Float, {{.*}} : $Float, [[PB_TUPLE_CPY]] : $(predecessor: _AD__loop_context_bb1__Pred__src_0_wrt_0))
// CHECK-SIL: bb3({{.*}} : $Float, {{.*}} : $Float, {{.*}} : @owned $(predecessor: _AD__loop_context_bb1__Pred__src_0_wrt_0)):
// Test `switch_enum`.
enum Enum {
case a(Float)
case b(Float, Float)
}
@differentiable(reverse)
@_silgen_name("enum_notactive")
func enum_notactive(_ e: Enum, _ x: Float) -> Float {
switch e {
case let .a(a): return x * a
case let .b(b1, b2): return x * b1 * b2
}
}
// CHECK-SIL-LABEL: sil hidden [ossa] @enum_notactiveTJrUSpSr : $@convention(thin) (Enum, Float) -> (Float, @owned @callee_guaranteed (Float) -> Float) {
// CHECK-SIL: bb0([[ENUM_ARG:%.*]] : $Enum, [[X_ARG:%.*]] : $Float):
// CHECK-SIL: [[BB0_PB_STRUCT:%.*]] = tuple ()
// CHECK-SIL: switch_enum [[ENUM_ARG]] : $Enum, case #Enum.a!enumelt: bb1, case #Enum.b!enumelt: bb2
// CHECK-SIL: bb1([[ENUM_A:%.*]] : $Float):
// CHECK-SIL: [[BB1_PRED_PRED0:%.*]] = enum $_AD__enum_notactive_bb1__Pred__src_0_wrt_1, #_AD__enum_notactive_bb1__Pred__src_0_wrt_1.bb0!enumelt, [[BB0_PB_STRUCT]] : $()
// CHECK-SIL: [[BB1_PB_STRUCT:%.*]] = tuple $(predecessor: _AD__enum_notactive_bb1__Pred__src_0_wrt_1, @callee_guaranteed (Float) -> Float) ([[BB1_PRED_PRED0]]
// CHECK-SIL: [[BB3_PRED_PRED1:%.*]] = enum $_AD__enum_notactive_bb3__Pred__src_0_wrt_1, #_AD__enum_notactive_bb3__Pred__src_0_wrt_1.bb1!enumelt, [[BB1_PB_STRUCT]] : $(predecessor: _AD__enum_notactive_bb1__Pred__src_0_wrt_1, @callee_guaranteed (Float) -> Float)
// CHECK-SIL: br bb3({{.*}} : $Float, [[BB3_PRED_PRED1]] : $_AD__enum_notactive_bb3__Pred__src_0_wrt_1)
// CHECK-SIL: bb2([[ENUM_B:%.*]] : $(Float, Float)):
// CHECK-SIL: [[BB2_PRED_PRED0:%.*]] = enum $_AD__enum_notactive_bb2__Pred__src_0_wrt_1, #_AD__enum_notactive_bb2__Pred__src_0_wrt_1.bb0!enumelt, [[BB0_PB_STRUCT]] : $()
// CHECK-SIL: [[BB2_PB_STRUCT:%.*]] = tuple $(predecessor: _AD__enum_notactive_bb2__Pred__src_0_wrt_1, @callee_guaranteed (Float) -> Float, @callee_guaranteed (Float) -> Float) ([[BB2_PRED_PRED0]]
// CHECK-SIL: [[BB3_PRED_PRED2:%.*]] = enum $_AD__enum_notactive_bb3__Pred__src_0_wrt_1, #_AD__enum_notactive_bb3__Pred__src_0_wrt_1.bb2!enumelt, [[BB2_PB_STRUCT]] : $(predecessor: _AD__enum_notactive_bb2__Pred__src_0_wrt_1, @callee_guaranteed (Float) -> Float, @callee_guaranteed (Float) -> Float)
// CHECK-SIL: br bb3({{.*}} : $Float, [[BB3_PRED_PRED2]] : $_AD__enum_notactive_bb3__Pred__src_0_wrt_1)
// CHECK-SIL: bb3([[ORIG_RES:%.*]] : $Float, [[BB3_PRED_ARG:%.*]] : @owned $_AD__enum_notactive_bb3__Pred__src_0_wrt_1)
// CHECK-SIL: [[PULLBACK_REF:%.*]] = function_ref @enum_notactiveTJpUSpSr
// CHECK-SIL: [[PB:%.*]] = partial_apply [callee_guaranteed] [[PULLBACK_REF]]([[BB3_PRED_ARG]])
// CHECK-SIL: [[VJP_RESULT:%.*]] = tuple ([[ORIG_RES]] : $Float, [[PB]] : $@callee_guaranteed (Float) -> Float)
// CHECK-SIL: return [[VJP_RESULT]]
// Test `switch_enum_addr`.
// Clone of `enum Optional<Wrapped>`.
enum AddressOnlyEnum<T> {
case some(T)
case none
}
@differentiable(reverse)
@_silgen_name("enum_addr_notactive")
func enum_addr_notactive<T>(_ e: AddressOnlyEnum<T>, _ x: Float) -> Float {
switch e {
case .none: break
case .some: break
}
return x
}
// CHECK-SIL-LABEL: sil hidden [ossa] @enum_addr_notactivelTJrUSpSr : $@convention(thin) <τ_0_0> (@in_guaranteed AddressOnlyEnum<τ_0_0>, Float) -> (Float, @owned @callee_guaranteed (Float) -> Float) {
// CHECK-SIL: bb0([[ENUM_ARG:%.*]] : $*AddressOnlyEnum<τ_0_0>, [[X_ARG:%.*]] : $Float):
// CHECK-SIL: [[ENUM_ADDR:%.*]] = alloc_stack $AddressOnlyEnum<τ_0_0>
// CHECK-SIL: copy_addr [[ENUM_ARG]] to [init] [[ENUM_ADDR]] : $*AddressOnlyEnum<τ_0_0>
// CHECK-SIL: [[BB0_PB_STRUCT:%.*]] = tuple ()
// CHECK-SIL: switch_enum_addr [[ENUM_ADDR]] : $*AddressOnlyEnum<τ_0_0>, case #AddressOnlyEnum.none!enumelt: bb1, case #AddressOnlyEnum.some!enumelt: bb2
// CHECK-SIL-LABEL: bb1:
// CHECK-SIL: [[BB1_PRED_PRED0:%.*]] = enum $_AD__enum_addr_notactive_bb1__Pred__src_0_wrt_1_l<τ_0_0>, #_AD__enum_addr_notactive_bb1__Pred__src_0_wrt_1_l.bb0!enumelt, [[BB0_PB_STRUCT]] : $()
// CHECK-SIL: dealloc_stack [[ENUM_ADDR]] : $*AddressOnlyEnum<τ_0_0>
// CHECK-SIL: [[BB1_PB_STRUCT:%.*]] = tuple $(predecessor: _AD__enum_addr_notactive_bb1__Pred__src_0_wrt_1_l<τ_0_0>) ([[BB1_PRED_PRED0]])
// CHECK-SIL: [[BB3_PRED_PRED1:%.*]] = enum $_AD__enum_addr_notactive_bb3__Pred__src_0_wrt_1_l<τ_0_0>, #_AD__enum_addr_notactive_bb3__Pred__src_0_wrt_1_l.bb1!enumelt, [[BB1_PB_STRUCT]] : $(predecessor: _AD__enum_addr_notactive_bb1__Pred__src_0_wrt_1_l<τ_0_0>)
// CHECK-SIL: br bb3([[BB3_PRED_PRED1]] : $_AD__enum_addr_notactive_bb3__Pred__src_0_wrt_1_l<τ_0_0>)
// CHECK-SIL-LABEL: bb2:
// CHECK-SIL: [[BB2_PRED_PRED0:%.*]] = enum $_AD__enum_addr_notactive_bb2__Pred__src_0_wrt_1_l<τ_0_0>, #_AD__enum_addr_notactive_bb2__Pred__src_0_wrt_1_l.bb0!enumelt, [[BB0_PB_STRUCT]] : $()
// CHECK-SIL: [[ENUM_DATA:%.*]] = unchecked_take_enum_data_addr [[ENUM_ADDR]] : $*AddressOnlyEnum<τ_0_0>, #AddressOnlyEnum.some!enumelt
// CHECK-SIL: destroy_addr [[ENUM_DATA]] : $*τ_0_0
// CHECK-SIL: dealloc_stack [[ENUM_ADDR]] : $*AddressOnlyEnum<τ_0_0>
// CHECK-SIL: [[BB2_PB_STRUCT:%.*]] = tuple $(predecessor: _AD__enum_addr_notactive_bb2__Pred__src_0_wrt_1_l<τ_0_0>) ([[BB2_PRED_PRED0]])
// CHECK-SIL: [[BB3_PRED_PRED2:%.*]] = enum $_AD__enum_addr_notactive_bb3__Pred__src_0_wrt_1_l<τ_0_0>, #_AD__enum_addr_notactive_bb3__Pred__src_0_wrt_1_l.bb2!enumelt, [[BB2_PB_STRUCT]] : $(predecessor: _AD__enum_addr_notactive_bb2__Pred__src_0_wrt_1_l<τ_0_0>)
// CHECK-SIL: br bb3([[BB3_PRED_PRED2]] : $_AD__enum_addr_notactive_bb3__Pred__src_0_wrt_1_l<τ_0_0>)
// CHECK-SIL: bb3([[BB3_PRED_ARG:%.*]] : $_AD__enum_addr_notactive_bb3__Pred__src_0_wrt_1_l<τ_0_0>):
// CHECK-SIL: [[PB_FNREF:%.*]] = function_ref @enum_addr_notactivelTJpUSpSr : $@convention(thin) <τ_0_0> (Float, @owned _AD__enum_addr_notactive_bb3__Pred__src_0_wrt_1_l<τ_0_0>) -> Float
// CHECK-SIL: [[PB:%.*]] = partial_apply [callee_guaranteed] [[PB_FNREF]]<τ_0_0>([[BB3_PRED_ARG]]) : $@convention(thin) <τ_0_0> (Float, @owned _AD__enum_addr_notactive_bb3__Pred__src_0_wrt_1_l<τ_0_0>) -> Float
// CHECK-SIL: [[VJP_RESULT:%.*]] = tuple ([[X_ARG]] : $Float, [[PB]] : $@callee_guaranteed (Float) -> Float)
// CHECK-SIL: return [[VJP_RESULT]] : $(Float, @callee_guaranteed (Float) -> Float)
// Test control flow + tuple buffer.
// Verify that pullback buffers are not allocated for address projections.
@differentiable(reverse)
@_silgen_name("cond_tuple_var")
func cond_tuple_var(_ x: Float) -> Float {
// expected-warning @+1 {{variable 'y' was never mutated; consider changing to 'let' constant}}
var y = (x, x)
if x > 0 {
return y.0
}
return y.1
}
// CHECK-SIL-LABEL: sil private [ossa] @cond_tuple_varTJpSpSr : $@convention(thin) (Float, @owned _AD__cond_tuple_var_bb3__Pred__src_0_wrt_0) -> Float {
// CHECK-SIL: bb0([[SEED:%.*]] : $Float, [[BB3_PRED:%.*]] : $_AD__cond_tuple_var_bb3__Pred__src_0_wrt_0):
// CHECK-SIL: copy_addr {{%.*}} to {{%.*}} : $*(Float, Float)
// CHECK-SIL-NOT: copy_addr {{%.*}} to {{%.*}} : $*Float
// CHECK-SIL: switch_enum [[BB3_PRED]] : $_AD__cond_tuple_var_bb3__Pred__src_0_wrt_0, case #_AD__cond_tuple_var_bb3__Pred__src_0_wrt_0.bb2!enumelt: bb1, case #_AD__cond_tuple_var_bb3__Pred__src_0_wrt_0.bb1!enumelt: bb3
// CHECK-SIL: bb1([[BB3_PRED2_TRAMP_PB_STRUCT:%.*]] : $(predecessor: _AD__cond_tuple_var_bb2__Pred__src_0_wrt_0)):
// CHECK-SIL: br bb2({{%.*}} : $Float, {{%.*}} : $Float, [[BB3_PRED2_TRAMP_PB_STRUCT]] : $(predecessor: _AD__cond_tuple_var_bb2__Pred__src_0_wrt_0))
// CHECK-SIL: bb2({{%.*}} : $Float, {{%.*}} : $Float, [[BB2_PB_STRUCT:%.*]] : $(predecessor: _AD__cond_tuple_var_bb2__Pred__src_0_wrt_0)):
// CHECK-SIL: [[BB2_PRED:%.*]] = destructure_tuple [[BB2_PB_STRUCT]]
// CHECK-SIL: copy_addr {{%.*}} to {{%.*}} : $*(Float, Float)
// CHECK-SIL-NOT: copy_addr {{%.*}} to {{%.*}} : $*Float
// CHECK-SIL: switch_enum [[BB2_PRED]] : $_AD__cond_tuple_var_bb2__Pred__src_0_wrt_0, case #_AD__cond_tuple_var_bb2__Pred__src_0_wrt_0.bb0!enumelt: bb6
// CHECK-SIL: bb3([[BB3_PRED1_TRAMP_PB_STRUCT:%.*]] : $(predecessor: _AD__cond_tuple_var_bb1__Pred__src_0_wrt_0)):
// CHECK-SIL: br bb4({{%.*}} : $Float, {{%.*}} : $Float, [[BB3_PRED1_TRAMP_PB_STRUCT]] : $(predecessor: _AD__cond_tuple_var_bb1__Pred__src_0_wrt_0))
// CHECK-SIL: bb4({{%.*}} : $Float, {{%.*}} : $Float, [[BB1_PB_STRUCT:%.*]] : $(predecessor: _AD__cond_tuple_var_bb1__Pred__src_0_wrt_0)):
// CHECK-SIL: [[BB1_PRED:%.*]] = destructure_tuple [[BB1_PB_STRUCT]]
// CHECK-SIL: copy_addr {{%.*}} to {{%.*}} : $*(Float, Float)
// CHECK-SIL-NOT: copy_addr {{%.*}} to {{%.*}} : $*Float
// CHECK-SIL: switch_enum [[BB1_PRED]] : $_AD__cond_tuple_var_bb1__Pred__src_0_wrt_0, case #_AD__cond_tuple_var_bb1__Pred__src_0_wrt_0.bb0!enumelt: bb5
// CHECK-SIL: bb5([[BB1_PRED0_TRAMP_PB_STRUCT:%.*]] : $()):
// CHECK-SIL: br bb7({{%.*}} : $Float, [[BB1_PRED0_TRAMP_PB_STRUCT]] : $())
// CHECK-SIL: bb6([[BB2_PRED0_TRAMP_PB_STRUCT:%.*]] : $()):
// CHECK-SIL: br bb7({{%.*}} : $Float, [[BB2_PRED0_TRAMP_PB_STRUCT]] : $())
// CHECK-SIL: bb7({{%.*}} : $Float, [[BB0_PB_STRUCT:%.*]] : $()):
// CHECK-SIL: return {{%.*}} : $Float
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