derek.holloway
7502bf64a4
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65 lines
3.5 KiB
LLVM
65 lines
3.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 5
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; RUN: opt -passes='print<scalar-evolution>' -disable-output %s 2>&1 | FileCheck %s
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target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-n32:64-S128-Fn32"
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define i32 @last_loaded_with_or_exit(i32 %n, ptr %arr) mustprogress {
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; CHECK-LABEL: 'last_loaded_with_or_exit'
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; CHECK-NEXT: Classifying expressions for: @last_loaded_with_or_exit
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; CHECK-NEXT: %iv = phi i32 [ %iv.next, %latch ], [ 0, %entry ]
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; CHECK-NEXT: --> {0,+,1}<%header> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %header: Computable }
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; CHECK-NEXT: %last_loaded = phi i32 [ %last_loaded.next, %latch ], [ 0, %entry ]
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; CHECK-NEXT: --> %last_loaded U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %header: Variant }
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; CHECK-NEXT: %iv_minus_one = add i32 -1, %iv
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; CHECK-NEXT: --> {-1,+,1}<%header> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %header: Computable }
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; CHECK-NEXT: %stay = or i1 %iv_lt_n, %iv_minus_one_lt_n
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; CHECK-NEXT: --> (%iv_minus_one_lt_n umax %iv_lt_n) U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %header: Variant }
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; CHECK-NEXT: %body_iv_minus_one = add i32 -1, %iv
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; CHECK-NEXT: --> {-1,+,1}<%header> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %header: Computable }
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; CHECK-NEXT: %idx = zext nneg i32 %body_iv_minus_one to i64
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; CHECK-NEXT: --> (zext i32 {-1,+,1}<%header> to i64) U: [0,4294967296) S: [0,4294967296) Exits: <<Unknown>> LoopDispositions: { %header: Computable }
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; CHECK-NEXT: %addr = getelementptr inbounds i32, ptr %arr, i64 %idx
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; CHECK-NEXT: --> ((4 * (zext i32 {-1,+,1}<%header> to i64))<nuw><nsw> + %arr) U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %header: Computable }
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; CHECK-NEXT: %loaded = load i32, ptr %addr, align 4
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; CHECK-NEXT: --> %loaded U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %header: Variant }
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; CHECK-NEXT: %last_loaded.next = phi i32 [ %last_loaded, %body ], [ %loaded, %do_load ]
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; CHECK-NEXT: --> %last_loaded.next U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %header: Variant }
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; CHECK-NEXT: %iv.next = add i32 %iv, 1
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; CHECK-NEXT: --> {1,+,1}<%header> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %header: Computable }
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; CHECK-NEXT: Determining loop execution counts for: @last_loaded_with_or_exit
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; CHECK-NEXT: Loop %header: Unpredictable backedge-taken count.
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; CHECK-NEXT: Loop %header: Unpredictable constant max backedge-taken count.
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; CHECK-NEXT: Loop %header: Unpredictable symbolic max backedge-taken count.
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;
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entry:
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br label %header
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header:
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%iv = phi i32 [ %iv.next, %latch ], [ 0, %entry ]
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%last_loaded = phi i32 [ %last_loaded.next, %latch ], [ 0, %entry ]
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%iv_lt_n = icmp ult i32 %iv, %n
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%iv_minus_one = add i32 -1, %iv
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%iv_minus_one_lt_n = icmp ult i32 %iv_minus_one, %n
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%stay = or i1 %iv_lt_n, %iv_minus_one_lt_n
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br i1 %stay, label %body, label %exit
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body:
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%body_iv_minus_one = add i32 -1, %iv
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%body_iv_minus_one_nonneg = icmp sgt i32 %body_iv_minus_one, -1
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br i1 %body_iv_minus_one_nonneg, label %do_load, label %latch
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do_load:
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%idx = zext nneg i32 %body_iv_minus_one to i64
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%addr = getelementptr inbounds i32, ptr %arr, i64 %idx
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%loaded = load i32, ptr %addr
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br label %latch
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latch:
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%last_loaded.next = phi i32 [ %last_loaded, %body ], [ %loaded, %do_load ]
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%iv.next = add i32 %iv, 1
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br label %header
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exit:
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ret i32 %last_loaded
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}
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