7854a1abfd
Forget SCEVs based on exit phis in case SCEV looked through the phi. After unswitching, it may not be possible to look through the phi due to it having multiple incoming values, so it needs to be re-computed. Fixes #58868
74 lines
2.8 KiB
LLVM
74 lines
2.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes="loop-mssa(loop-deletion,simple-loop-unswitch<nontrivial;trivial>),loop(indvars)" -verify-scev -S %s | FileCheck %s
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define void @pr58868(i1 %c.1, ptr %src, ptr %dst) {
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; CHECK-LABEL: @pr58868(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: br i1 [[C_1:%.*]], label [[ENTRY_SPLIT_US:%.*]], label [[ENTRY_SPLIT:%.*]]
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; CHECK: entry.split.us:
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; CHECK-NEXT: br label [[OUTER_HEADER_US:%.*]]
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; CHECK: outer.header.us:
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; CHECK-NEXT: br label [[OUTER_BB1_US:%.*]]
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; CHECK: outer.bb1.us:
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; CHECK-NEXT: br label [[OUTER_BB2_US:%.*]]
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; CHECK: outer.bb2.us:
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; CHECK-NEXT: [[LV_US:%.*]] = load i16, ptr [[SRC:%.*]], align 1
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; CHECK-NEXT: br i1 true, label [[OUTER_HEADER_LOOPEXIT_US:%.*]], label [[OUTER_BB2_SPLIT_SPLIT_US:%.*]]
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; CHECK: outer.header.loopexit.us:
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; CHECK-NEXT: br label [[OUTER_HEADER_US]]
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; CHECK: outer.bb2.split.split.us:
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; CHECK-NEXT: [[LV_LCSSA_US:%.*]] = phi i16 [ [[LV_US]], [[OUTER_BB2_US]] ]
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; CHECK-NEXT: br label [[OUTER_BB2_SPLIT:%.*]]
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; CHECK: entry.split:
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; CHECK-NEXT: br label [[OUTER_HEADER:%.*]]
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; CHECK: outer.header.loopexit:
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; CHECK-NEXT: unreachable
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; CHECK: outer.header:
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; CHECK-NEXT: br label [[OUTER_BB2:%.*]]
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; CHECK: outer.bb2:
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; CHECK-NEXT: [[LV:%.*]] = load i16, ptr [[SRC]], align 1
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; CHECK-NEXT: br i1 false, label [[OUTER_HEADER_LOOPEXIT:%.*]], label [[OUTER_BB2_SPLIT_SPLIT:%.*]]
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; CHECK: outer.bb2.split.split:
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; CHECK-NEXT: [[LV_LCSSA:%.*]] = phi i16 [ [[LV]], [[OUTER_BB2]] ]
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; CHECK-NEXT: br label [[OUTER_BB2_SPLIT]]
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; CHECK: outer.bb2.split:
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; CHECK-NEXT: [[DOTUS_PHI:%.*]] = phi i16 [ [[LV_LCSSA]], [[OUTER_BB2_SPLIT_SPLIT]] ], [ [[LV_LCSSA_US]], [[OUTER_BB2_SPLIT_SPLIT_US]] ]
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; CHECK-NEXT: br label [[INNER_HEADER:%.*]]
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; CHECK: inner.header:
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; CHECK-NEXT: [[IV:%.*]] = phi i16 [ [[DOTUS_PHI]], [[OUTER_BB2_SPLIT]] ], [ [[IV_NEXT:%.*]], [[INNER_LATCH:%.*]] ]
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; CHECK-NEXT: br label [[INNER_LATCH]]
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; CHECK: inner.latch:
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; CHECK-NEXT: [[IV_NEXT]] = add nsw i16 [[IV]], 1
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; CHECK-NEXT: store i16 0, ptr [[DST:%.*]], align 1
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; CHECK-NEXT: [[C_2:%.*]] = icmp ne i16 [[IV]], 0
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; CHECK-NEXT: br i1 [[C_2]], label [[INNER_HEADER]], 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.header
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outer.header:
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br i1 %c.1, label %outer.bb1, label %outer.bb2
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outer.bb1:
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br label %outer.bb2
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outer.bb2:
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%lv = load i16, ptr %src, align 1
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br label %inner.header
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inner.header:
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%iv = phi i16 [ %lv, %outer.bb2 ], [ %iv.next, %inner.latch ]
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br i1 %c.1, label %outer.header, label %inner.latch
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inner.latch:
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%iv.next = add nsw i16 %iv, 1
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store i16 0, ptr %dst, align 1
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%c.2 = icmp ne i16 %iv, 0
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br i1 %c.2, label %inner.header, label %exit
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exit:
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ret void
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}
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