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Merge pull request #4728 from shajrawi/enum_unique_values
[SR-2512] Ignore duplicate conditions when optimizing switch statement
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// RUN: %target-sil-opt -enable-sil-verify-all %s -simplify-cfg | %FileCheck %s | ||
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sil_stage canonical | ||
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import Builtin | ||
import Swift | ||
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enum DupCaseEnum { | ||
case firstCase | ||
case secondCase | ||
} | ||
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// CHECK-LABEL: sil @performSwitch : $@convention(thin) (Int, @thin DupCaseEnum.Type) -> DupCaseEnum { | ||
// CHECK: bb0(%0 : $Int, %1 : $@thin DupCaseEnum.Type): | ||
// CHECK: select_value | ||
// CHECK: br bb1 | ||
// CHECK: bb1: | ||
// CHECK: return | ||
sil @performSwitch : $@convention(thin) (Int, @thin DupCaseEnum.Type) -> DupCaseEnum { | ||
// %0 // users: %9, %5, %3, %2 | ||
bb0(%0 : $Int, %1 : $@thin DupCaseEnum.Type): | ||
%4 = integer_literal $Builtin.Int64, 0 // user: %6 | ||
%5 = struct_extract %0 : $Int, #Int._value // user: %6 | ||
%6 = builtin "cmp_eq_Int64"(%4 : $Builtin.Int64, %5 : $Builtin.Int64) : $Builtin.Int1 // users: %10, %7 | ||
cond_br %6, bb6, bb1 // id: %7 | ||
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bb1: // Preds: bb0 | ||
br bb2 // id: %8 | ||
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bb2: // Preds: bb1 | ||
cond_br %6, bb5, bb3 // id: %10 | ||
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bb3: // Preds: bb2 | ||
br bb4 // id: %11 | ||
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bb4: // Preds: bb3 | ||
%12 = enum $DupCaseEnum, #DupCaseEnum.secondCase!enumelt // user: %13 | ||
br bb7(%12 : $DupCaseEnum) // id: %13 | ||
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bb5: // Preds: bb2 | ||
%14 = enum $DupCaseEnum, #DupCaseEnum.firstCase!enumelt // user: %15 | ||
br bb7(%14 : $DupCaseEnum) // id: %15 | ||
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bb6: // Preds: bb0 | ||
%16 = enum $DupCaseEnum, #DupCaseEnum.firstCase!enumelt // user: %17 | ||
br bb7(%16 : $DupCaseEnum) // id: %17 | ||
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// %18 // user: %19 | ||
bb7(%18 : $DupCaseEnum): // Preds: bb6 bb5 bb4 | ||
return %18 : $DupCaseEnum // id: %19 | ||
} | ||
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// CHECK-LABEL: sil @performSwitch_bail_out : $@convention(thin) (Int, @thin DupCaseEnum.Type) -> DupCaseEnum { | ||
// CHECK: bb0(%0 : $Int, %1 : $@thin DupCaseEnum.Type): | ||
// CHECK-NOT: select_value | ||
// CHECK-NOT: br bb1 | ||
// CHECK: cond_br | ||
sil @performSwitch_bail_out : $@convention(thin) (Int, @thin DupCaseEnum.Type) -> DupCaseEnum { | ||
// %0 // users: %9, %5, %3, %2 | ||
bb0(%0 : $Int, %1 : $@thin DupCaseEnum.Type): | ||
%4 = integer_literal $Builtin.Int64, 0 // user: %6 | ||
%5 = struct_extract %0 : $Int, #Int._value // user: %6 | ||
%6 = builtin "cmp_eq_Int64"(%4 : $Builtin.Int64, %5 : $Builtin.Int64) : $Builtin.Int1 // users: %10, %7 | ||
cond_br %6, bb6, bb1 // id: %7 | ||
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bb1: // Preds: bb0 | ||
br bb2 // id: %8 | ||
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bb2: // Preds: bb1 | ||
cond_br %6, bb5, bb3 // id: %10 | ||
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bb3: // Preds: bb2 | ||
br bb4 // id: %11 | ||
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bb4: // Preds: bb3 | ||
%12 = enum $DupCaseEnum, #DupCaseEnum.secondCase!enumelt // user: %13 | ||
br bb7(%12 : $DupCaseEnum) // id: %13 | ||
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bb5: // Preds: bb2 | ||
%14 = enum $DupCaseEnum, #DupCaseEnum.secondCase!enumelt // user: %15 | ||
br bb7(%14 : $DupCaseEnum) // id: %15 | ||
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bb6: // Preds: bb0 | ||
%16 = enum $DupCaseEnum, #DupCaseEnum.firstCase!enumelt // user: %17 | ||
br bb7(%16 : $DupCaseEnum) // id: %17 | ||
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// %18 // user: %19 | ||
bb7(%18 : $DupCaseEnum): // Preds: bb6 bb5 bb4 | ||
return %18 : $DupCaseEnum // id: %19 | ||
} |