| Mehdi Amini | afd1351 | 2015-11-05 05:49:43 +0000 | [diff] [blame] | 1 | ; RUN: opt -loop-accesses -analyze %s | FileCheck %s |
| 2 | |
| 3 | ; Test that the loop accesses are proven safe in this case. |
| 4 | ; The analyzer uses to be confused by the "diamond" because GetUnderlyingObjects |
| 5 | ; is saying that the two pointers can both points to null. The loop analyzer |
| 6 | ; needs to ignore null in the results returned by GetUnderlyingObjects. |
| 7 | |
| 8 | ; CHECK: Memory dependences are safe with run-time checks |
| 9 | |
| 10 | |
| 11 | ; ModuleID = 'bugpoint-reduced-simplified.bc' |
| 12 | target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" |
| 13 | target triple = "x86_64-apple-macosx10.11.0" |
| 14 | |
| 15 | ; Function Attrs: ssp uwtable |
| 16 | define void @foo(i1 %cond, i32* %ptr1, i32* %ptr2) { |
| 17 | br i1 %cond, label %.preheader, label %diamond |
| 18 | |
| 19 | diamond: ; preds = %.noexc.i.i |
| 20 | br label %.preheader |
| 21 | |
| 22 | .preheader: ; preds = %diamond, %0 |
| 23 | %ptr1_or_null = phi i32* [ null, %0 ], [ %ptr1, %diamond ] |
| 24 | %ptr2_or_null = phi i32* [ null, %0 ], [ %ptr2, %diamond ] |
| 25 | br label %.lr.ph |
| 26 | |
| 27 | .lr.ph: ; preds = %.lr.ph, %.preheader |
| 28 | %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 10, %.preheader ] |
| 29 | %indvars.iv.next = add nsw i64 %indvars.iv, -1 |
| 30 | %tmp4 = getelementptr inbounds i32, i32* %ptr2_or_null, i64 %indvars.iv.next |
| 31 | %tmp5 = load i32, i32* %tmp4, align 4 |
| 32 | %tmp6 = getelementptr inbounds i32, i32* %ptr1_or_null, i64 %indvars.iv.next |
| 33 | store i32 undef, i32* %tmp6, align 4 |
| 34 | br i1 false, label %.lr.ph, label %.end |
| 35 | |
| 36 | .end: |
| 37 | ret void |
| 38 | } |