98eb917939
Method forgetLoop only forgets expression of phi or its users. SCEV expressions except the above mentioned may still has loop dispositions that point to the destroyed loop, which might cause a crash. Fixes: https://github.com/llvm/llvm-project/issues/58865 Reviewed By: nikic, fhahn Differential Revision: https://reviews.llvm.org/D137651
52 lines
2.2 KiB
LLVM
52 lines
2.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -loop-flatten -verify-scev -S < %s | FileCheck %s
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;
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define void @sum_2d(ptr %p) {
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; CHECK-LABEL: @sum_2d(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[FLATTEN_TRIPCOUNT:%.*]] = mul i16 1, 1
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; CHECK-NEXT: br label [[OUTER:%.*]]
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; CHECK: outer:
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; CHECK-NEXT: [[SUM_04:%.*]] = phi i16 [ 0, [[ENTRY:%.*]] ], [ [[DOTLCSSA:%.*]], [[OUTER_LATCH:%.*]] ]
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; CHECK-NEXT: [[OUTER_IV:%.*]] = phi i16 [ 0, [[ENTRY]] ], [ [[OUTER_IV_NEXT:%.*]], [[OUTER_LATCH]] ]
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; CHECK-NEXT: br label [[INNER:%.*]]
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; CHECK: inner:
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; CHECK-NEXT: [[SUM_12:%.*]] = phi i16 [ [[SUM_04]], [[OUTER]] ]
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; CHECK-NEXT: [[INNER_IV:%.*]] = phi i16 [ 0, [[OUTER]] ]
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; CHECK-NEXT: [[TMP0:%.*]] = load i16, ptr [[P:%.*]], align 1
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; CHECK-NEXT: [[INNER_IV_NEXT:%.*]] = add nsw i16 [[INNER_IV]], 1
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; CHECK-NEXT: [[CMP2:%.*]] = icmp slt i16 [[INNER_IV]], 0
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; CHECK-NEXT: br label [[OUTER_LATCH]]
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; CHECK: outer.latch:
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; CHECK-NEXT: [[DOTLCSSA]] = phi i16 [ [[TMP0]], [[INNER]] ]
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; CHECK-NEXT: [[OUTER_IV_NEXT]] = add nsw i16 [[OUTER_IV]], 1
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; CHECK-NEXT: [[CMP:%.*]] = icmp slt i16 [[OUTER_IV_NEXT]], [[FLATTEN_TRIPCOUNT]]
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; CHECK-NEXT: br i1 [[CMP]], label [[OUTER]], label [[EXIT:%.*]]
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; CHECK: exit:
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; CHECK-NEXT: ret void
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;
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entry:
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br label %outer
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outer: ; preds = %outer.latch, %entry
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%sum.04 = phi i16 [ 0, %entry ], [ %0, %outer.latch ]
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%outer.iv = phi i16 [ 0, %entry ], [ %outer.iv.next, %outer.latch ]
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br label %inner
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inner: ; preds = %inner, %outer
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%sum.12 = phi i16 [ %sum.04, %outer ], [ %0, %inner ]
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%inner.iv = phi i16 [ 0, %outer ], [ %inner.iv.next, %inner ]
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%0 = load i16, ptr %p, align 1
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%inner.iv.next = add nsw i16 %inner.iv, 1
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%cmp2 = icmp slt i16 %inner.iv, 0
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br i1 %cmp2, label %inner, label %outer.latch
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outer.latch: ; preds = %inner
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%outer.iv.next = add nsw i16 %outer.iv, 1
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%cmp = icmp slt i16 %outer.iv.next, 0
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br i1 %cmp, label %outer, label %exit
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exit: ; preds = %outer.latch
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ret void
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}
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