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[SCEV] Add test for #123550 (NFC)

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Nikita Popov 2025-01-24 17:10:10 +01:00
parent 5d2393a222
commit 37bf0a10fb
1 changed files with 50 additions and 0 deletions
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llvm/test/Analysis/ScalarEvolution/pr123550.ll Normal file
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; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 5
; RUN: opt -disable-output -passes='print<scalar-evolution>' < %s 2>&1 | FileCheck %s
; FIXME: This is a miscompile.
define i32 @test() {
; CHECK-LABEL: 'test'
; CHECK-NEXT: Classifying expressions for: @test
; CHECK-NEXT: %phi = phi i32 [ -173, %bb ], [ %sub, %loop ]
; CHECK-NEXT: --> (-173 + (-1 * (zext i8 ((-83 /u {0,+,1}<%loop>) * {0,+,-1}<%loop>) to i32))<nuw><nsw>)<nuw><nsw> U: empty-set S: empty-set Exits: -173 LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %iv2 = phi i32 [ 1, %bb ], [ %iv2.inc, %loop ]
; CHECK-NEXT: --> {1,+,1}<nuw><nsw><%loop> U: [1,2) S: [1,2) Exits: 1 LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %srem = srem i32 729259140, %phi
; CHECK-NEXT: --> (729259140 + (-1 * (-173 + (-1 * (zext i8 ((-83 /u {0,+,1}<%loop>) * {0,+,-1}<%loop>) to i32))<nuw><nsw>)<nuw><nsw> * (729259140 /u (-173 + (-1 * (zext i8 ((-83 /u {0,+,1}<%loop>) * {0,+,-1}<%loop>) to i32))<nuw><nsw>)<nuw><nsw>)))<nuw><nsw> U: empty-set S: empty-set Exits: 729259140 LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %trunc = trunc i32 %iv2 to i8
; CHECK-NEXT: --> {1,+,1}<%loop> U: [1,2) S: [1,2) Exits: 1 LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %urem = urem i8 -83, %trunc
; CHECK-NEXT: --> (-83 + ((-83 /u {1,+,1}<%loop>) * {-1,+,-1}<%loop>)) U: [0,1) S: [0,1) Exits: 0 LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %zext = zext i8 %urem to i32
; CHECK-NEXT: --> (zext i8 (-83 + ((-83 /u {1,+,1}<%loop>) * {-1,+,-1}<%loop>)) to i32) U: [0,1) S: [0,1) Exits: 0 LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %sub = sub i32 0, %zext
; CHECK-NEXT: --> (-1 * (zext i8 (-83 + ((-83 /u {1,+,1}<%loop>) * {-1,+,-1}<%loop>)) to i32))<nuw><nsw> U: [0,1) S: [0,1) Exits: 0 LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %iv2.inc = add i32 %iv2, 1
; CHECK-NEXT: --> {2,+,1}<nuw><nsw><%loop> U: [2,3) S: [2,3) Exits: 2 LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %srem.lcssa = phi i32 [ %srem, %loop ]
; CHECK-NEXT: --> (729259140 + (-1 * (-173 + (-1 * (zext i8 ((-83 /u {0,+,1}<%loop>) * {0,+,-1}<%loop>) to i32))<nuw><nsw>)<nuw><nsw> * (729259140 /u (-173 + (-1 * (zext i8 ((-83 /u {0,+,1}<%loop>) * {0,+,-1}<%loop>) to i32))<nuw><nsw>)<nuw><nsw>)))<nuw><nsw> U: empty-set S: empty-set --> 729259140 U: [729259140,729259141) S: [729259140,729259141)
; CHECK-NEXT: Determining loop execution counts for: @test
; CHECK-NEXT: Loop %loop: backedge-taken count is i32 0
; CHECK-NEXT: Loop %loop: constant max backedge-taken count is i32 0
; CHECK-NEXT: Loop %loop: symbolic max backedge-taken count is i32 0
; CHECK-NEXT: Loop %loop: Trip multiple is 1
;
bb:
br label %loop
loop:
%phi = phi i32 [ -173, %bb ], [ %sub, %loop ]
%iv2 = phi i32 [ 1, %bb ], [ %iv2.inc, %loop ]
%srem = srem i32 729259140, %phi
%trunc = trunc i32 %iv2 to i8
%urem = urem i8 -83, %trunc
%zext = zext i8 %urem to i32
%sub = sub i32 0, %zext
%iv2.inc = add i32 %iv2, 1
%icmp = icmp eq i32 %zext, 0
br i1 %icmp, label %exit, label %loop
exit:
%srem.lcssa = phi i32 [ %srem, %loop ]
ret i32 %srem.lcssa
}