1 ; RUN: opt < %s -loop-versioning -S -o - | FileCheck %s 2 3 ; This test case used to end like this: 4 ; 5 ; Instruction does not dominate all uses! 6 ; %t2 = load i16, i16* @b, align 1, !tbaa !2, !alias.scope !6 7 ; %tobool = icmp eq i16 %t2, 0 8 ; LLVM ERROR: Broken function found, compilation aborted! 9 ; 10 ; due to a fault where we did not replace the use of %t2 in the icmp in 11 ; for.end, when adding a new PHI node for the versioned loops based on the 12 ; loop-defined values used outside of the loop. 13 ; 14 ; Verify that the code compiles, that we get a versioned loop, and that the 15 ; uses of %t2 in for.end and if.then are updated to use the value from the 16 ; added phi node. 17 18 ; CHECK: define void @f1 19 ; CHECK: for.end: 20 ; CHECK-NEXT: %t2.lver = phi i16 [ %t2, %for.body ], [ %t2.lver.orig, %for.body.lver.orig ] 21 ; CHECK-NEXT: %tobool = icmp eq i16 %t2.lver, 0 22 ; CHECK: if.then: 23 ; CHECK-NEXT: store i16 %t2.lver 24 25 @a = dso_local global i16 0, align 1 26 @b = dso_local global i16 0, align 1 27 @c = dso_local global i16* null, align 1 28 29 define void @f1() { 30 entry: 31 %t0 = load i16*, i16** @c, align 1 32 br label %for.cond 33 34 for.cond: ; preds = %for.cond.backedge, %entry 35 br label %for.body 36 37 for.body: ; preds = %for.cond, %for.body 38 %t1 = phi i64 [ 0, %for.cond ], [ %inc, %for.body ] 39 %t2 = load i16, i16* @b, align 1, !tbaa !2 40 store i16 %t2, i16* %t0, align 1, !tbaa !2 41 %inc = add nuw nsw i64 %t1, 1 42 %cmp = icmp ult i64 %inc, 3 43 br i1 %cmp, label %for.body, label %for.end 44 45 for.end: ; preds = %for.body 46 %tobool = icmp eq i16 %t2, 0 47 br i1 %tobool, label %for.cond.backedge, label %if.then 48 49 for.cond.backedge: ; preds = %for.end, %if.then 50 br label %for.cond 51 52 if.then: ; preds = %for.end 53 store i16 %t2, i16* @a, align 1, !tbaa !2 54 br label %for.cond.backedge 55 } 56 57 !llvm.module.flags = !{!0} 58 !llvm.ident = !{!1} 59 60 !0 = !{i32 1, !"wchar_size", i32 1} 61 !1 = !{!"clang version 7.0.0"} 62 !2 = !{!3, !3, i64 0} 63 !3 = !{!"long long", !4, i64 0} 64 !4 = !{!"omnipotent char", !5, i64 0} 65 !5 = !{!"Simple C/C++ TBAA"} 66
