| ; PR23524 |
| ; The test is to check redundency produced by loop unroll pass |
| ; should be cleaned up by later pass. |
| ; RUN: opt < %s -O2 -S | FileCheck %s |
| |
| ; After loop unroll: |
| ; %dec18 = add nsw i32 %dec18.in, -1 |
| ; ... |
| ; %dec18.1 = add nsw i32 %dec18, -1 |
| ; should be merged to: |
| ; %dec18.1 = add nsw i32 %dec18.in, -2 |
| ; |
| ; CHECK-LABEL: @_Z3fn1v( |
| ; CHECK: %dec18.1 = add nsw i32 %dec18.in, -2 |
| |
| ; ModuleID = '<stdin>' |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| @b = global i32 0, align 4 |
| @c = global i32 0, align 4 |
| |
| ; Function Attrs: nounwind uwtable |
| define void @_Z3fn1v() #0 { |
| entry: |
| %tmp = load i32, ptr @b, align 4 |
| %tobool20 = icmp eq i32 %tmp, 0 |
| br i1 %tobool20, label %for.end6, label %for.body.lr.ph |
| |
| for.body.lr.ph: ; preds = %entry |
| br label %for.body |
| |
| for.cond1.for.cond.loopexit_crit_edge: ; preds = %for.inc |
| %add.ptr.lcssa = phi ptr [ %add.ptr, %for.inc ] |
| %incdec.ptr.lcssa = phi ptr [ %incdec.ptr, %for.inc ] |
| br label %for.cond.loopexit |
| |
| for.cond.loopexit: ; preds = %for.body, %for.cond1.for.cond.loopexit_crit_edge |
| %r.1.lcssa = phi ptr [ %add.ptr.lcssa, %for.cond1.for.cond.loopexit_crit_edge ], [ %r.022, %for.body ] |
| %a.1.lcssa = phi ptr [ %incdec.ptr.lcssa, %for.cond1.for.cond.loopexit_crit_edge ], [ %a.021, %for.body ] |
| %tmp1 = load i32, ptr @b, align 4 |
| %tobool = icmp eq i32 %tmp1, 0 |
| br i1 %tobool, label %for.cond.for.end6_crit_edge, label %for.body |
| |
| for.body: ; preds = %for.cond.loopexit, %for.body.lr.ph |
| %r.022 = phi ptr [ undef, %for.body.lr.ph ], [ %r.1.lcssa, %for.cond.loopexit ] |
| %a.021 = phi ptr [ undef, %for.body.lr.ph ], [ %a.1.lcssa, %for.cond.loopexit ] |
| %tmp2 = load i32, ptr @c, align 4 |
| %tobool215 = icmp eq i32 %tmp2, 0 |
| br i1 %tobool215, label %for.cond.loopexit, label %for.body3.lr.ph |
| |
| for.body3.lr.ph: ; preds = %for.body |
| br label %for.body3 |
| |
| for.body3: ; preds = %for.inc, %for.body3.lr.ph |
| %dec18.in = phi i32 [ %tmp2, %for.body3.lr.ph ], [ %dec18, %for.inc ] |
| %r.117 = phi ptr [ %r.022, %for.body3.lr.ph ], [ %add.ptr, %for.inc ] |
| %a.116 = phi ptr [ %a.021, %for.body3.lr.ph ], [ %incdec.ptr, %for.inc ] |
| %dec18 = add nsw i32 %dec18.in, -1 |
| %tmp3 = load i8, ptr %a.116, align 1 |
| %cmp = icmp eq i8 %tmp3, 0 |
| br i1 %cmp, label %if.then, label %for.inc |
| |
| if.then: ; preds = %for.body3 |
| %arrayidx = getelementptr inbounds i16, ptr %r.117, i64 1 |
| store i16 0, ptr %arrayidx, align 2 |
| store i16 0, ptr %r.117, align 2 |
| %arrayidx5 = getelementptr inbounds i16, ptr %r.117, i64 2 |
| store i16 0, ptr %arrayidx5, align 2 |
| br label %for.inc |
| |
| for.inc: ; preds = %if.then, %for.body3 |
| %incdec.ptr = getelementptr inbounds i8, ptr %a.116, i64 1 |
| %add.ptr = getelementptr inbounds i16, ptr %r.117, i64 3 |
| %tobool2 = icmp eq i32 %dec18, 0 |
| br i1 %tobool2, label %for.cond1.for.cond.loopexit_crit_edge, label %for.body3, !llvm.loop !0 |
| |
| for.cond.for.end6_crit_edge: ; preds = %for.cond.loopexit |
| br label %for.end6 |
| |
| for.end6: ; preds = %for.cond.for.end6_crit_edge, %entry |
| ret void |
| } |
| |
| !0 = !{!0, !1} |
| !1 = !{!"llvm.loop.unroll.count", i32 2} |