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ValueTracking/test: cover recur limit in non-equal PHIs #113205

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Nov 5, 2024
Merged

ValueTracking/test: cover recur limit in non-equal PHIs #113205

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50 changes: 50 additions & 0 deletions llvm/test/Analysis/ValueTracking/known-non-equal.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -316,6 +316,56 @@ exit:
ret i1 %cmp
}

define i1 @known_non_equal_phis_max_recursion_limit(i1 %cond, i32 %switch.cond) {
; CHECK-LABEL: @known_non_equal_phis_max_recursion_limit(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[BB0:%.*]]
; CHECK: bb0:
; CHECK-NEXT: [[PHIA_0:%.*]] = phi i32 [ [[PHIA_1:%.*]], [[BB1:%.*]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT: [[PHIB_0:%.*]] = phi i32 [ [[PHIB_1:%.*]], [[BB1]] ], [ 0, [[ENTRY]] ]
; CHECK-NEXT: br i1 [[COND:%.*]], label [[SWITCH_BLOCK:%.*]], label [[EXIT:%.*]]
; CHECK: switch.block:
; CHECK-NEXT: switch i32 [[SWITCH_COND:%.*]], label [[BB1]] [
; CHECK-NEXT: i32 0, label [[EPILOGUE:%.*]]
; CHECK-NEXT: i32 1, label [[EPILOGUE]]
; CHECK-NEXT: ]
; CHECK: bb1:
; CHECK-NEXT: [[PHIA_1]] = phi i32 [ [[PHIA_0]], [[SWITCH_BLOCK]] ], [ 0, [[EPILOGUE]] ]
; CHECK-NEXT: [[PHIB_1]] = phi i32 [ [[PHIB_0]], [[SWITCH_BLOCK]] ], [ 0, [[EPILOGUE]] ]
; CHECK-NEXT: br label [[BB0]]
; CHECK: epilogue:
; CHECK-NEXT: br label [[BB1]]
; CHECK: exit:
; CHECK-NEXT: [[RET:%.*]] = icmp eq i32 [[PHIA_0]], [[PHIB_0]]
; CHECK-NEXT: ret i1 [[RET]]
;
entry:
br label %bb0

bb0:
%phiA.0 = phi i32 [ %phiA.1, %bb1 ], [ 0, %entry ]
%phiB.0 = phi i32 [ %phiB.1, %bb1 ], [ 0, %entry ]
br i1 %cond, label %switch.block, label %exit

switch.block:
switch i32 %switch.cond, label %bb1 [
i32 0, label %epilogue
i32 1, label %epilogue
]

bb1:
%phiA.1 = phi i32 [ %phiA.0, %switch.block ], [ 0, %epilogue ]
%phiB.1 = phi i32 [ %phiB.0, %switch.block ], [ 0, %epilogue ]
br label %bb0

epilogue:
br label %bb1

exit:
%ret = icmp eq i32 %phiA.0, %phiB.0
ret i1 %ret
}

define i1 @known_non_equal_phis_fail(i8 %p, ptr %pq, i8 %n, i8 %r) {
; CHECK-LABEL: @known_non_equal_phis_fail(
; CHECK-NEXT: entry:
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