1; RUN: opt < %s -indvars -S | FileCheck %s 2 3target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" 4 5; PR25372 6; We can compute the expression of %phi0 and that is a SCEV 7; constant. However, instcombine can't deduce this, so we can 8; potentially end up trying to handle a constant when replacing 9; congruent IVs. 10 11; CHECK-LABEL: crash 12define void @crash() { 13entry: 14 br i1 false, label %not_taken, label %pre 15 16not_taken: 17 br label %pre 18 19pre: 20; %phi0.pre and %phi1.pre are evaluated by SCEV to constant 0. 21 %phi0.pre = phi i32 [ 0, %entry ], [ 2, %not_taken ] 22 %phi1.pre = phi i32 [ 0, %entry ], [ 1, %not_taken ] 23 br label %loop 24 25loop: 26; %phi0 and %phi1 are evaluated by SCEV to constant 0. 27 %phi0 = phi i32 [ 0, %loop ], [ %phi0.pre, %pre ] 28 %phi1 = phi i32 [ 0, %loop ], [ %phi1.pre, %pre ] 29 br i1 undef, label %exit, label %loop 30 31exit: 32 ret void 33} 34