llvm/test/Analysis/ScalarEvolution/pr87798.ll

; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py UTC_ARGS: --version 4
; RUN: opt -disable-output -passes='print<scalar-evolution>' -verify-scev < %s 2>&1 | FileCheck %s

target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128-ni:1-p2:32:8:8:32-ni:2"
target triple = "x86_64-unknown-linux-gnu"

; print<scalar-evolution> is used to compute SCEVs for all values in the
; function.
; We should not crash on multiplicative inverse called within SCEV's binomial
; coefficient function.

define i32 @pr87798() {
; CHECK-LABEL: 'pr87798'
; CHECK-NEXT:  Classifying expressions for: @pr87798
; CHECK-NEXT:    %phi = phi i32 [ 0, %bb ], [ %add4, %bb1 ]
; CHECK-NEXT:    --> {0,+,0,+,0,+,2,+,3}<%bb1> U: full-set S: full-set Exits: 0 LoopDispositions: { %bb1: Computable }
; CHECK-NEXT:    %phi2 = phi i32 [ 0, %bb ], [ %add, %bb1 ]
; CHECK-NEXT:    --> {0,+,0,+,1}<%bb1> U: full-set S: full-set Exits: 0 LoopDispositions: { %bb1: Computable }
; CHECK-NEXT:    %phi3 = phi i32 [ 0, %bb ], [ %add5, %bb1 ]
; CHECK-NEXT:    --> {0,+,1}<nuw><nsw><%bb1> U: [0,1) S: [0,1) Exits: 0 LoopDispositions: { %bb1: Computable }
; CHECK-NEXT:    %add = add i32 %phi2, %phi3
; CHECK-NEXT:    --> {0,+,1,+,1}<%bb1> U: full-set S: full-set Exits: 0 LoopDispositions: { %bb1: Computable }
; CHECK-NEXT:    %mul = mul i32 %phi2, %phi3
; CHECK-NEXT:    --> {0,+,0,+,2,+,3}<%bb1> U: full-set S: full-set Exits: 0 LoopDispositions: { %bb1: Computable }
; CHECK-NEXT:    %add4 = add i32 %mul, %phi
; CHECK-NEXT:    --> {0,+,0,+,2,+,5,+,3}<%bb1> U: full-set S: full-set Exits: 0 LoopDispositions: { %bb1: Computable }
; CHECK-NEXT:    %and = and i32 %phi, 1
; CHECK-NEXT:    --> (zext i1 {false,+,false,+,false,+,false,+,true}<%bb1> to i32) U: [0,2) S: [0,2) Exits: 0 LoopDispositions: { %bb1: Computable }
; CHECK-NEXT:    %add5 = add i32 %phi3, 1
; CHECK-NEXT:    --> {1,+,1}<nuw><nsw><%bb1> U: [1,2) S: [1,2) Exits: 1 LoopDispositions: { %bb1: Computable }
; CHECK-NEXT:    %phi9 = phi i32 [ %and, %bb1 ]
; CHECK-NEXT:    --> (zext i1 {false,+,false,+,false,+,false,+,true}<%bb1> to i32) U: [0,2) S: [0,2) --> 0 U: [0,1) S: [0,1)
; CHECK-NEXT:    %zext = zext i32 %phi9 to i64
; CHECK-NEXT:    --> poison U: full-set S: full-set
; CHECK-NEXT:  Determining loop execution counts for: @pr87798
; CHECK-NEXT:  Loop %loop: <multiple exits> Unpredictable backedge-taken count.
; CHECK-NEXT:  Loop %loop: Unpredictable constant max backedge-taken count.
; CHECK-NEXT:  Loop %loop: Unpredictable symbolic max backedge-taken count.
; CHECK-NEXT:  Loop %bb1: backedge-taken count is i1 false
; CHECK-NEXT:  Loop %bb1: constant max backedge-taken count is i1 false
; CHECK-NEXT:  Loop %bb1: symbolic max backedge-taken count is i1 false
; CHECK-NEXT:  Loop %bb1: Trip multiple is 1
;
bb:
  br label %bb1

bb1:                                              ; preds = %bb1, %bb
  %phi = phi i32 [ 0, %bb ], [ %add4, %bb1 ]
  %phi2 = phi i32 [ 0, %bb ], [ %add, %bb1 ]
  %phi3 = phi i32 [ 0, %bb ], [ %add5, %bb1 ]
  %add = add i32 %phi2, %phi3
  %mul = mul i32 %phi2, %phi3
  %add4 = add i32 %mul, %phi
  %and = and i32 %phi, 1
  %add5 = add i32 %phi3, 1
  br i1 true, label %preheader, label %bb1

preheader:                                              ; preds = %bb1
  %phi9 = phi i32 [ %and, %bb1 ]
  br label %loop

loop:                                              ; preds = %preheader, %loop
  br label %loop

bb7:                                              ; No predecessors!
  %zext = zext i32 %phi9 to i64
  ret i32 0
}