f066d7504e
This patch relands https://github.com/llvm/llvm-project/pull/124270. Closes https://github.com/llvm/llvm-project/issues/126409. The root cause is that we incorrectly preserve the samesign flag after truncating operands of an icmp: https://alive2.llvm.org/ce/z/4NE9gS --------- Co-authored-by: Ramkumar Ramachandra <ramkumar.ramachandra@codasip.com>
43 lines
1.8 KiB
LLVM
43 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -disable-output "-passes=print<scalar-evolution>" \
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; RUN: -scalar-evolution-classify-expressions=0 < %s 2>&1 | FileCheck %s
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define i32 @exit_count_samesign(i32 %iter.count, ptr %ptr) {
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; CHECK-LABEL: 'exit_count_samesign'
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; CHECK-NEXT: Determining loop execution counts for: @exit_count_samesign
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; CHECK-NEXT: Loop %inner.loop: backedge-taken count is {(-2 + %iter.count),+,-1}<nw><%outer.loop>
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; CHECK-NEXT: Loop %inner.loop: constant max backedge-taken count is i32 2147483646
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; CHECK-NEXT: Loop %inner.loop: symbolic max backedge-taken count is {(-2 + %iter.count),+,-1}<nw><%outer.loop>
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; CHECK-NEXT: Loop %inner.loop: Trip multiple is 1
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; CHECK-NEXT: Loop %outer.loop: <multiple exits> Unpredictable backedge-taken count.
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; CHECK-NEXT: Loop %outer.loop: Unpredictable constant max backedge-taken count.
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; CHECK-NEXT: Loop %outer.loop: Unpredictable symbolic max backedge-taken count.
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;
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entry:
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br label %outer.loop
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ph:
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br label %outer.loop
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outer.loop:
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%iv.outer = phi i32 [ %iv.outer.1, %ph ], [ %iter.count, %entry ]
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%iv.outer.1 = add nsw i32 %iv.outer, -1
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%ext.outer = zext nneg i32 %iv.outer.1 to i64
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%gep.outer = getelementptr double, ptr %ptr, i64 %ext.outer
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store double poison, ptr %gep.outer
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%exit.cond.outer = icmp samesign ugt i32 %iv.outer, 1
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br i1 %exit.cond.outer, label %inner.loop, label %ph
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inner.loop:
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%iv.inner = phi i32 [ %iv.next, %inner.loop ], [ 0, %outer.loop ]
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%ext.inner = zext nneg i32 %iv.inner to i64
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%gep.inner = getelementptr double, ptr %ptr, i64 %ext.inner
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store double poison, ptr %gep.inner
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%iv.next = add nuw nsw i32 %iv.inner, 1
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%exit.cond.inner = icmp slt i32 %iv.next, %iv.outer.1
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br i1 %exit.cond.inner, label %inner.loop, label %ph
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exit:
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ret i32 0
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}
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