| ; RUN: opt < %s -loop-versioning -S -o - | FileCheck %s |
| |
| ; This test case used to end like this: |
| ; |
| ; Instruction does not dominate all uses! |
| ; %t2 = load i16, i16* @b, align 1, !tbaa !2, !alias.scope !6 |
| ; %tobool = icmp eq i16 %t2, 0 |
| ; LLVM ERROR: Broken function found, compilation aborted! |
| ; |
| ; due to a fault where we did not replace the use of %t2 in the icmp in |
| ; for.end, when adding a new PHI node for the versioned loops based on the |
| ; loop-defined values used outside of the loop. |
| ; |
| ; Verify that the code compiles, that we get a versioned loop, and that the |
| ; uses of %t2 in for.end and if.then are updated to use the value from the |
| ; added phi node. |
| |
| ; CHECK: define void @f1 |
| ; CHECK: for.end: |
| ; CHECK-NEXT: %t2.lver = phi i16 [ %t2, %for.body ], [ %t2.lver.orig, %for.body.lver.orig ] |
| ; CHECK-NEXT: %tobool = icmp eq i16 %t2.lver, 0 |
| ; CHECK: if.then: |
| ; CHECK-NEXT: store i16 %t2.lver |
| |
| @a = dso_local global i16 0, align 1 |
| @b = dso_local global i16 0, align 1 |
| @c = dso_local global i16* null, align 1 |
| |
| define void @f1() { |
| entry: |
| %t0 = load i16*, i16** @c, align 1 |
| br label %for.cond |
| |
| for.cond: ; preds = %for.cond.backedge, %entry |
| br label %for.body |
| |
| for.body: ; preds = %for.cond, %for.body |
| %t1 = phi i64 [ 0, %for.cond ], [ %inc, %for.body ] |
| %t2 = load i16, i16* @b, align 1, !tbaa !2 |
| store i16 %t2, i16* %t0, align 1, !tbaa !2 |
| %inc = add nuw nsw i64 %t1, 1 |
| %cmp = icmp ult i64 %inc, 3 |
| br i1 %cmp, label %for.body, label %for.end |
| |
| for.end: ; preds = %for.body |
| %tobool = icmp eq i16 %t2, 0 |
| br i1 %tobool, label %for.cond.backedge, label %if.then |
| |
| for.cond.backedge: ; preds = %for.end, %if.then |
| br label %for.cond |
| |
| if.then: ; preds = %for.end |
| store i16 %t2, i16* @a, align 1, !tbaa !2 |
| br label %for.cond.backedge |
| } |
| |
| !llvm.module.flags = !{!0} |
| !llvm.ident = !{!1} |
| |
| !0 = !{i32 1, !"wchar_size", i32 1} |
| !1 = !{!"clang version 7.0.0"} |
| !2 = !{!3, !3, i64 0} |
| !3 = !{!"long long", !4, i64 0} |
| !4 = !{!"omnipotent char", !5, i64 0} |
| !5 = !{!"Simple C/C++ TBAA"} |