327 lines
9 KiB
LLVM
327 lines
9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
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; RUN: opt < %s -passes=simplifycfg -simplifycfg-require-and-preserve-domtree=1 -S | FileCheck %s
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; Test a bunch of cases where the combination of phis in switch should be merged into one phi
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declare void @use(i8)
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define i8 @phis_of_switch_minimal(i8 noundef %arg) {
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; CHECK-LABEL: define i8 @phis_of_switch_minimal
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; CHECK-SAME: (i8 noundef [[ARG:%.*]]) {
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; CHECK-NEXT: start:
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; CHECK-NEXT: switch i8 [[ARG]], label [[UNREACHABLE:%.*]] [
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; CHECK-NEXT: i8 0, label [[CASE01:%.*]]
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; CHECK-NEXT: i8 1, label [[CASE1:%.*]]
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; CHECK-NEXT: i8 2, label [[END:%.*]]
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; CHECK-NEXT: ]
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; CHECK: unreachable:
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; CHECK-NEXT: unreachable
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; CHECK: case1:
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; CHECK-NEXT: br label [[END]]
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; CHECK: case01:
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; CHECK-NEXT: br label [[END]]
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; CHECK: end:
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; CHECK-NEXT: [[PHI2:%.*]] = phi i8 [ 3, [[START:%.*]] ], [ 2, [[CASE1]] ], [ 1, [[CASE01]] ]
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; CHECK-NEXT: ret i8 [[PHI2]]
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;
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start:
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switch i8 %arg, label %unreachable [
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i8 0, label %case01
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i8 1, label %case1
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i8 2, label %end
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]
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unreachable:
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unreachable
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case1:
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br label %case01
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case01:
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%phi1 = phi i8 [ 2, %case1 ], [1, %start]
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br label %end
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end:
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%phi2 = phi i8 [ %phi1, %case01 ], [ 3, %start ]
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ret i8 %phi2
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}
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define i8 @phis_of_switch(i8 noundef %arg) {
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; CHECK-LABEL: define i8 @phis_of_switch
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; CHECK-SAME: (i8 noundef [[ARG:%.*]]) {
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; CHECK-NEXT: start:
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; CHECK-NEXT: switch i8 [[ARG]], label [[UNREACHABLE:%.*]] [
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; CHECK-NEXT: i8 0, label [[CASE012:%.*]]
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; CHECK-NEXT: i8 1, label [[CASE1:%.*]]
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; CHECK-NEXT: i8 2, label [[CASE2:%.*]]
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; CHECK-NEXT: i8 3, label [[END:%.*]]
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; CHECK-NEXT: ]
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; CHECK: unreachable:
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; CHECK-NEXT: unreachable
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; CHECK: case1:
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; CHECK-NEXT: br label [[END]]
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; CHECK: case2:
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; CHECK-NEXT: br label [[END]]
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; CHECK: case012:
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; CHECK-NEXT: br label [[END]]
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; CHECK: end:
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; CHECK-NEXT: [[PHI2:%.*]] = phi i8 [ 4, [[START:%.*]] ], [ 3, [[CASE2]] ], [ 2, [[CASE1]] ], [ 1, [[CASE012]] ]
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; CHECK-NEXT: ret i8 [[PHI2]]
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;
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start:
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switch i8 %arg, label %unreachable [
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i8 0, label %case012
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i8 1, label %case1
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i8 2, label %case2
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i8 3, label %end
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]
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unreachable:
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unreachable
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case1:
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br label %case012
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case2:
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br label %case012
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case012:
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%phi1 = phi i8 [ 3, %case2 ], [ 2, %case1 ], [1, %start]
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br label %end
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end:
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%phi2 = phi i8 [ %phi1, %case012 ], [ 4, %start ]
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ret i8 %phi2
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}
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define i8 @multiple_phis_of_switch(i8 noundef %arg) {
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; CHECK-LABEL: define i8 @multiple_phis_of_switch
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; CHECK-SAME: (i8 noundef [[ARG:%.*]]) {
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; CHECK-NEXT: start:
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; CHECK-NEXT: switch i8 [[ARG]], label [[UNREACHABLE:%.*]] [
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; CHECK-NEXT: i8 0, label [[CASE012:%.*]]
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; CHECK-NEXT: i8 1, label [[CASE1:%.*]]
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; CHECK-NEXT: i8 2, label [[CASE2:%.*]]
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; CHECK-NEXT: i8 3, label [[END:%.*]]
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; CHECK-NEXT: ]
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; CHECK: unreachable:
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; CHECK-NEXT: unreachable
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; CHECK: case1:
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; CHECK-NEXT: br label [[END]]
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; CHECK: case2:
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; CHECK-NEXT: br label [[END]]
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; CHECK: case012:
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; CHECK-NEXT: br label [[END]]
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; CHECK: end:
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; CHECK-NEXT: [[PHI2_1:%.*]] = phi i8 [ 4, [[START:%.*]] ], [ 3, [[CASE2]] ], [ 2, [[CASE1]] ], [ 1, [[CASE012]] ]
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; CHECK-NEXT: [[PHI2_2:%.*]] = phi i8 [ 5, [[START]] ], [ 3, [[CASE2]] ], [ 2, [[CASE1]] ], [ 1, [[CASE012]] ]
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; CHECK-NEXT: [[PHI2_3:%.*]] = phi i8 [ 3, [[START]] ], [ 6, [[CASE2]] ], [ 5, [[CASE1]] ], [ 4, [[CASE012]] ]
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; CHECK-NEXT: call void @use(i8 [[PHI2_1]])
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; CHECK-NEXT: call void @use(i8 [[PHI2_2]])
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; CHECK-NEXT: call void @use(i8 [[PHI2_3]])
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; CHECK-NEXT: ret i8 [[PHI2_1]]
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;
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start:
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switch i8 %arg, label %unreachable [
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i8 0, label %case012
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i8 1, label %case1
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i8 2, label %case2
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i8 3, label %end
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]
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unreachable:
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unreachable
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case1:
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br label %case012
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case2:
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br label %case012
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case012:
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%phi1_1 = phi i8 [ 3, %case2 ], [ 2, %case1 ], [1, %start]
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%phi1_2 = phi i8 [ 6, %case2 ], [ 5, %case1 ], [4, %start]
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br label %end
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end:
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%phi2_1 = phi i8 [ %phi1_1, %case012 ], [ 4, %start ]
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%phi2_2 = phi i8 [ %phi1_1, %case012 ], [ 5, %start ]
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%phi2_3 = phi i8 [ %phi1_2, %case012 ], [ 3, %start ]
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call void @use(i8 %phi2_1)
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call void @use(i8 %phi2_2)
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call void @use(i8 %phi2_3)
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ret i8 %phi2_1
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}
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define i8 @phis_of_switch_multiple_stage0(i8 noundef %arg) {
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; CHECK-LABEL: define i8 @phis_of_switch_multiple_stage0
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; CHECK-SAME: (i8 noundef [[ARG:%.*]]) {
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; CHECK-NEXT: start:
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; CHECK-NEXT: switch i8 [[ARG]], label [[UNREACHABLE:%.*]] [
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; CHECK-NEXT: i8 0, label [[CASE0:%.*]]
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; CHECK-NEXT: i8 1, label [[CASE1:%.*]]
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; CHECK-NEXT: i8 2, label [[CASE2:%.*]]
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; CHECK-NEXT: i8 3, label [[CASE0123:%.*]]
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; CHECK-NEXT: i8 4, label [[CASE01234:%.*]]
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; CHECK-NEXT: i8 5, label [[END:%.*]]
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; CHECK-NEXT: ]
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; CHECK: unreachable:
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; CHECK-NEXT: unreachable
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; CHECK: case0:
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; CHECK-NEXT: br label [[END]]
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; CHECK: case1:
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; CHECK-NEXT: br label [[END]]
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; CHECK: case2:
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; CHECK-NEXT: br label [[END]]
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; CHECK: case0123:
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; CHECK-NEXT: br label [[END]]
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; CHECK: case01234:
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; CHECK-NEXT: br label [[END]]
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; CHECK: end:
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; CHECK-NEXT: [[PHI3:%.*]] = phi i8 [ 6, [[START:%.*]] ], [ 3, [[CASE2]] ], [ 2, [[CASE1]] ], [ 1, [[CASE0]] ], [ 4, [[CASE0123]] ], [ 5, [[CASE01234]] ]
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; CHECK-NEXT: ret i8 [[PHI3]]
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;
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start:
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switch i8 %arg, label %unreachable [
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i8 0, label %case0
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i8 1, label %case1
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i8 2, label %case2
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i8 3, label %case0123
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i8 4, label %case01234
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i8 5, label %end
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]
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unreachable:
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unreachable
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case0:
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br label %case0123
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case1:
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br label %case0123
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case2:
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br label %case0123
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case0123:
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%phi1 = phi i8 [4, %start], [ 3, %case2 ], [ 2, %case1 ], [ 1, %case0 ]
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br label %case01234
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case01234:
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%phi2 = phi i8 [ %phi1, %case0123 ], [ 5, %start ]
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br label %end
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end:
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%phi3 = phi i8 [ %phi2, %case01234 ], [6, %start]
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ret i8 %phi3
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}
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define i8 @phis_of_switch_multiple_stage1(i8 noundef %arg) {
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; CHECK-LABEL: define i8 @phis_of_switch_multiple_stage1
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; CHECK-SAME: (i8 noundef [[ARG:%.*]]) {
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; CHECK-NEXT: start:
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; CHECK-NEXT: switch i8 [[ARG]], label [[UNREACHABLE:%.*]] [
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; CHECK-NEXT: i8 0, label [[CASE0:%.*]]
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; CHECK-NEXT: i8 1, label [[CASE1:%.*]]
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; CHECK-NEXT: i8 2, label [[CASE012:%.*]]
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; CHECK-NEXT: i8 3, label [[CASE3:%.*]]
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; CHECK-NEXT: i8 4, label [[CASE4:%.*]]
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; CHECK-NEXT: i8 5, label [[CASE345:%.*]]
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; CHECK-NEXT: i8 6, label [[CASE0123456:%.*]]
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; CHECK-NEXT: ]
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; CHECK: unreachable:
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; CHECK-NEXT: unreachable
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; CHECK: case0:
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; CHECK-NEXT: br label [[CASE0123456]]
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; CHECK: case1:
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; CHECK-NEXT: br label [[CASE0123456]]
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; CHECK: case012:
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; CHECK-NEXT: br label [[CASE0123456]]
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; CHECK: case3:
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; CHECK-NEXT: br label [[CASE0123456]]
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; CHECK: case4:
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; CHECK-NEXT: br label [[CASE0123456]]
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; CHECK: case345:
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; CHECK-NEXT: br label [[CASE0123456]]
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; CHECK: case0123456:
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; CHECK-NEXT: [[PHI1234567:%.*]] = phi i8 [ 7, [[START:%.*]] ], [ 2, [[CASE1]] ], [ 1, [[CASE0]] ], [ 3, [[CASE012]] ], [ 5, [[CASE4]] ], [ 4, [[CASE3]] ], [ 6, [[CASE345]] ]
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; CHECK-NEXT: ret i8 [[PHI1234567]]
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;
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start:
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switch i8 %arg, label %unreachable [
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i8 0, label %case0
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i8 1, label %case1
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i8 2, label %case012
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i8 3, label %case3
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i8 4, label %case4
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i8 5, label %case345
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i8 6, label %case0123456
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]
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unreachable:
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unreachable
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case0:
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br label %case012
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case1:
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br label %case012
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case012:
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%phi123 = phi i8 [3, %start], [ 2, %case1 ], [ 1, %case0 ]
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br label %case0123456
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case3:
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br label %case345
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case4:
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br label %case345
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case345:
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%phi456 = phi i8 [6, %start], [ 5, %case4 ], [ 4, %case3 ]
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br label %case0123456
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case0123456:
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%phi1234567 = phi i8 [7, %start], [ %phi456, %case345 ], [ %phi123, %case012 ]
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ret i8 %phi1234567
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}
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define i8 @phis_of_switch_extra_use_fail(i8 noundef %arg) {
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; CHECK-LABEL: define i8 @phis_of_switch_extra_use_fail
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; CHECK-SAME: (i8 noundef [[ARG:%.*]]) {
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; CHECK-NEXT: start:
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; CHECK-NEXT: switch i8 [[ARG]], label [[UNREACHABLE:%.*]] [
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; CHECK-NEXT: i8 0, label [[CASE012:%.*]]
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; CHECK-NEXT: i8 1, label [[CASE1:%.*]]
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; CHECK-NEXT: i8 2, label [[CASE2:%.*]]
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; CHECK-NEXT: i8 3, label [[END:%.*]]
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; CHECK-NEXT: ]
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; CHECK: unreachable:
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; CHECK-NEXT: unreachable
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; CHECK: case1:
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; CHECK-NEXT: br label [[CASE012]]
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; CHECK: case2:
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; CHECK-NEXT: br label [[CASE012]]
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; CHECK: case012:
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; CHECK-NEXT: [[PHI1:%.*]] = phi i8 [ 3, [[CASE2]] ], [ 2, [[CASE1]] ], [ 1, [[START:%.*]] ]
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; CHECK-NEXT: call void @use(i8 [[PHI1]])
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; CHECK-NEXT: br label [[END]]
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; CHECK: end:
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; CHECK-NEXT: [[PHI2:%.*]] = phi i8 [ [[PHI1]], [[CASE012]] ], [ 4, [[START]] ]
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; CHECK-NEXT: ret i8 [[PHI2]]
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;
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start:
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switch i8 %arg, label %unreachable [
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i8 0, label %case012
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i8 1, label %case1
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i8 2, label %case2 i8 3, label %end
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]
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unreachable:
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unreachable
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case1:
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br label %case012
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case2:
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br label %case012
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case012:
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%phi1 = phi i8 [ 3, %case2 ], [ 2, %case1 ], [1, %start]
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call void @use(i8 %phi1)
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br label %end
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end:
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%phi2 = phi i8 [ %phi1, %case012 ], [ 4, %start ]
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ret i8 %phi2
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}
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