8d6e867eb2
If the phi node found by matchSimpleRecurrence is not from the current loop, then isAlmostDeadIV panics. With this patch we bail out early. Signed-off-by: Patrick O'Neill <patrick@rivosinc.com> --------- Signed-off-by: Patrick O'Neill <patrick@rivosinc.com>
41 lines
1.6 KiB
LLVM
41 lines
1.6 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -loop-reduce -S -lsr-term-fold | FileCheck %s
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; This test used to crash due to matchSimpleRecurrence matching the simple
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; recurrence in pn-loop when evaluating unrelated-loop. Since unrelated-loop
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; cannot jump to pn-node isAlmostDeadIV panics.
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define void @phi_node_different_bb() {
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; CHECK-LABEL: @phi_node_different_bb(
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; CHECK-NEXT: br label [[PN_LOOP:%.*]]
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; CHECK: pn-loop:
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; CHECK-NEXT: [[TMP1:%.*]] = phi i32 [ 1, [[TMP0:%.*]] ], [ [[TMP2:%.*]], [[PN_LOOP]] ]
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; CHECK-NEXT: [[TMP2]] = add i32 [[TMP1]], 1
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; CHECK-NEXT: [[TMP3:%.*]] = icmp ugt i32 [[TMP2]], 1
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; CHECK-NEXT: br i1 [[TMP3]], label [[PN_LOOP]], label [[UNRELATED_LOOP_PREHEADER:%.*]]
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; CHECK: unrelated-loop.preheader:
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; CHECK-NEXT: br label [[UNRELATED_LOOP:%.*]]
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; CHECK: unrelated-loop:
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; CHECK-NEXT: [[TMP4:%.*]] = icmp eq i32 [[TMP2]], 0
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; CHECK-NEXT: br i1 [[TMP4]], label [[END:%.*]], label [[UNRELATED_LOOP]]
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; CHECK: end:
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; CHECK-NEXT: ret void
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;
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br label %pn-loop
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pn-loop: ; preds = %pn-loop, %0
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%1 = phi i32 [ 1, %0 ], [ %2, %pn-loop ]
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%2 = add i32 %1, 1
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%3 = icmp ugt i32 %2, 1
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br i1 %3, label %pn-loop, label %unrelated-loop.preheader
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unrelated-loop.preheader: ; preds = %pn-loop
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br label %unrelated-loop
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unrelated-loop: ; preds = %unrelated-loop, %unrelated-loop.preheader
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%4 = icmp eq i32 %2, 0
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br i1 %4, label %end, label %unrelated-loop
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end: ; preds = %unrelated-loop
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ret void
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}
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