| ; RUN: opt -loop-unswitch -verify-loop-info -verify-dom-info -disable-output < %s |
| ; RUN: opt -loop-unswitch -enable-mssa-loop-dependency=true -verify-memoryssa -verify-loop-info -verify-dom-info -disable-output < %s |
| |
| ; Loop unswitch should be able to unswitch these loops and |
| ; preserve LCSSA and LoopSimplify forms. |
| |
| target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:64:64-v128:128:128-a0:0:64" |
| target triple = "armv6-apple-darwin9" |
| |
| @delim1 = external global i32 ; <i32*> [#uses=1] |
| @delim2 = external global i32 ; <i32*> [#uses=1] |
| |
| define i32 @ineqn(i8* %s, i8* %p) nounwind readonly { |
| entry: |
| %0 = load i32, i32* @delim1, align 4 ; <i32> [#uses=1] |
| %1 = load i32, i32* @delim2, align 4 ; <i32> [#uses=1] |
| br label %bb8.outer |
| |
| bb: ; preds = %bb8 |
| %2 = icmp eq i8* %p_addr.0, %s ; <i1> [#uses=1] |
| br i1 %2, label %bb10, label %bb2 |
| |
| bb2: ; preds = %bb |
| %3 = getelementptr inbounds i8, i8* %p_addr.0, i32 1 ; <i8*> [#uses=3] |
| switch i32 %ineq.0.ph, label %bb8.backedge [ |
| i32 0, label %bb3 |
| i32 1, label %bb6 |
| ] |
| |
| bb8.backedge: ; preds = %bb6, %bb5, %bb2 |
| br label %bb8 |
| |
| bb3: ; preds = %bb2 |
| %4 = icmp eq i32 %8, %0 ; <i1> [#uses=1] |
| br i1 %4, label %bb8.outer.loopexit, label %bb5 |
| |
| bb5: ; preds = %bb3 |
| br i1 %6, label %bb6, label %bb8.backedge |
| |
| bb6: ; preds = %bb5, %bb2 |
| %5 = icmp eq i32 %8, %1 ; <i1> [#uses=1] |
| br i1 %5, label %bb7, label %bb8.backedge |
| |
| bb7: ; preds = %bb6 |
| %.lcssa1 = phi i8* [ %3, %bb6 ] ; <i8*> [#uses=1] |
| br label %bb8.outer.backedge |
| |
| bb8.outer.backedge: ; preds = %bb8.outer.loopexit, %bb7 |
| %.lcssa2 = phi i8* [ %.lcssa1, %bb7 ], [ %.lcssa, %bb8.outer.loopexit ] ; <i8*> [#uses=1] |
| %ineq.0.ph.be = phi i32 [ 0, %bb7 ], [ 1, %bb8.outer.loopexit ] ; <i32> [#uses=1] |
| br label %bb8.outer |
| |
| bb8.outer.loopexit: ; preds = %bb3 |
| %.lcssa = phi i8* [ %3, %bb3 ] ; <i8*> [#uses=1] |
| br label %bb8.outer.backedge |
| |
| bb8.outer: ; preds = %bb8.outer.backedge, %entry |
| %ineq.0.ph = phi i32 [ 0, %entry ], [ %ineq.0.ph.be, %bb8.outer.backedge ] ; <i32> [#uses=3] |
| %p_addr.0.ph = phi i8* [ %p, %entry ], [ %.lcssa2, %bb8.outer.backedge ] ; <i8*> [#uses=1] |
| %6 = icmp eq i32 %ineq.0.ph, 1 ; <i1> [#uses=1] |
| br label %bb8 |
| |
| bb8: ; preds = %bb8.outer, %bb8.backedge |
| %p_addr.0 = phi i8* [ %p_addr.0.ph, %bb8.outer ], [ %3, %bb8.backedge ] ; <i8*> [#uses=3] |
| %7 = load i8, i8* %p_addr.0, align 1 ; <i8> [#uses=2] |
| %8 = sext i8 %7 to i32 ; <i32> [#uses=2] |
| %9 = icmp eq i8 %7, 0 ; <i1> [#uses=1] |
| br i1 %9, label %bb10, label %bb |
| |
| bb10: ; preds = %bb8, %bb |
| %.0 = phi i32 [ %ineq.0.ph, %bb ], [ 0, %bb8 ] ; <i32> [#uses=1] |
| ret i32 %.0 |
| } |
| |
| ; This is a simplified form of ineqn from above. It triggers some |
| ; different cases in the loop-unswitch code. |
| |
| define void @simplified_ineqn() nounwind readonly { |
| entry: |
| br label %bb8.outer |
| |
| bb8.outer: ; preds = %bb6, %bb2, %entry |
| %x = phi i32 [ 0, %entry ], [ 0, %bb6 ], [ 1, %bb2 ] ; <i32> [#uses=1] |
| br i1 undef, label %return, label %bb2 |
| |
| bb2: ; preds = %bb |
| switch i32 %x, label %bb6 [ |
| i32 0, label %bb8.outer |
| ] |
| |
| bb6: ; preds = %bb2 |
| br i1 undef, label %bb8.outer, label %bb2 |
| |
| return: ; preds = %bb8, %bb |
| ret void |
| } |
| |
| ; This function requires special handling to preserve LCSSA form. |
| ; PR4934 |
| |
| define void @pnp_check_irq() nounwind noredzone { |
| entry: |
| %conv56 = trunc i64 undef to i32 ; <i32> [#uses=1] |
| br label %while.cond.i |
| |
| while.cond.i: ; preds = %while.cond.i.backedge, %entry |
| %call.i25 = call i8* @pci_get_device() nounwind noredzone ; <i8*> [#uses=2] |
| br i1 undef, label %if.then65, label %while.body.i |
| |
| while.body.i: ; preds = %while.cond.i |
| br i1 undef, label %if.then31.i.i, label %while.cond.i.backedge |
| |
| while.cond.i.backedge: ; preds = %if.then31.i.i, %while.body.i |
| br label %while.cond.i |
| |
| if.then31.i.i: ; preds = %while.body.i |
| switch i32 %conv56, label %while.cond.i.backedge [ |
| i32 14, label %if.then42.i.i |
| i32 15, label %if.then42.i.i |
| ] |
| |
| if.then42.i.i: ; preds = %if.then31.i.i, %if.then31.i.i |
| %call.i25.lcssa48 = phi i8* [ %call.i25, %if.then31.i.i ], [ %call.i25, %if.then31.i.i ] ; <i8*> [#uses=0] |
| unreachable |
| |
| if.then65: ; preds = %while.cond.i |
| unreachable |
| } |
| |
| declare i8* @pci_get_device() noredzone |