| Jakob Stoklund Olesen | c321a20 | 2012-07-20 20:49:53 +0000 | [diff] [blame] | 1 | ; RUN: llc < %s -verify-machineinstrs | FileCheck %s |
| 2 | target triple = "x86_64-apple-macosx10.8.0" |
| 3 | |
| 4 | ; The critical edge from for.cond to if.end2 should be split to avoid injecting |
| 5 | ; copies into the loop. The use of %b after the loop causes interference that |
| 6 | ; makes a copy necessary. |
| 7 | ; <rdar://problem/11561842> |
| 8 | ; |
| 9 | ; CHECK: split_loop_exit |
| 10 | ; CHECK: %for.cond |
| 11 | ; CHECK-NOT: mov |
| 12 | ; CHECK: je |
| 13 | |
| 14 | define i32 @split_loop_exit(i32 %a, i32 %b, i8* nocapture %p) nounwind uwtable readonly ssp { |
| 15 | entry: |
| 16 | %cmp = icmp sgt i32 %a, 10 |
| 17 | br i1 %cmp, label %for.cond, label %if.end2 |
| 18 | |
| 19 | for.cond: ; preds = %entry, %for.cond |
| 20 | %p.addr.0 = phi i8* [ %incdec.ptr, %for.cond ], [ %p, %entry ] |
| 21 | %incdec.ptr = getelementptr inbounds i8* %p.addr.0, i64 1 |
| 22 | %0 = load i8* %p.addr.0, align 1 |
| 23 | %tobool = icmp eq i8 %0, 0 |
| 24 | br i1 %tobool, label %for.cond, label %if.end2 |
| 25 | |
| 26 | if.end2: ; preds = %for.cond, %entry |
| 27 | %r.0 = phi i32 [ %a, %entry ], [ %b, %for.cond ] |
| 28 | %add = add nsw i32 %r.0, %b |
| 29 | ret i32 %add |
| 30 | } |