derek.holloway
7502bf64a4
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35 lines
1.3 KiB
LLVM
35 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
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; RUN: opt -S -mtriple=x86_64-unknown-linux-gnu -passes=loop-reduce %s | FileCheck %s
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; TODO: LSR shouldn't introduce a redundant phi instead of reusing an existing one.
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define void @reuse_existing_phi() {
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; CHECK-LABEL: define void @reuse_existing_phi() {
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; CHECK-NEXT: [[ENTRY:.*]]:
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; CHECK-NEXT: br label %[[LOOP:.*]]
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; CHECK: [[LOOP]]:
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; CHECK-NEXT: [[LSR_IV:%.*]] = phi i64 [ [[LSR_IV_NEXT:%.*]], %[[LOOP]] ], [ 8, %[[ENTRY]] ]
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; CHECK-NEXT: [[IV:%.*]] = phi i64 [ 0, %[[ENTRY]] ], [ [[IV_NEXT:%.*]], %[[LOOP]] ]
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; CHECK-NEXT: [[IV_NEXT]] = add i64 [[IV]], 8
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; CHECK-NEXT: [[IV_INC:%.*]] = add i64 [[IV]], 1
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; CHECK-NEXT: [[USE:%.*]] = add i64 [[LSR_IV]], [[IV_INC]]
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; CHECK-NEXT: [[LSR_IV_NEXT]] = add i64 [[LSR_IV]], 8
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; CHECK-NEXT: [[CHECK:%.*]] = icmp eq i64 [[LSR_IV_NEXT]], 108
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; CHECK-NEXT: br i1 [[CHECK]], label %[[EXIT:.*]], label %[[LOOP]]
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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 %loop
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loop:
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%iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
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%iv.next = add i64 %iv, 8
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%iv.inc = add i64 %iv, 1
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%use = add i64 %iv.next, %iv.inc
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%check = icmp eq i64 %iv.next, 100
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br i1 %check, label %exit, label %loop
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exit:
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ret void
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}
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