40 lines
1.6 KiB
LLVM
40 lines
1.6 KiB
LLVM
; RUN: opt -loop-accesses -analyze %s | FileCheck %s
|
|
; RUN: opt -passes='require<scalar-evolution>,require<aa>,loop(print-access-info)' -disable-output < %s 2>&1 | FileCheck %s
|
|
|
|
; Test that the loop accesses are proven safe in this case.
|
|
; The analyzer uses to be confused by the "diamond" because GetUnderlyingObjects
|
|
; is saying that the two pointers can both points to null. The loop analyzer
|
|
; needs to ignore null in the results returned by GetUnderlyingObjects.
|
|
|
|
; CHECK: Memory dependences are safe with run-time checks
|
|
|
|
|
|
; ModuleID = 'bugpoint-reduced-simplified.bc'
|
|
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
|
|
target triple = "x86_64-apple-macosx10.11.0"
|
|
|
|
; Function Attrs: ssp uwtable
|
|
define void @foo(i1 %cond, i32* %ptr1, i32* %ptr2) {
|
|
br i1 %cond, label %.preheader, label %diamond
|
|
|
|
diamond: ; preds = %.noexc.i.i
|
|
br label %.preheader
|
|
|
|
.preheader: ; preds = %diamond, %0
|
|
%ptr1_or_null = phi i32* [ null, %0 ], [ %ptr1, %diamond ]
|
|
%ptr2_or_null = phi i32* [ null, %0 ], [ %ptr2, %diamond ]
|
|
br label %.lr.ph
|
|
|
|
.lr.ph: ; preds = %.lr.ph, %.preheader
|
|
%indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 10, %.preheader ]
|
|
%indvars.iv.next = add nsw i64 %indvars.iv, -1
|
|
%tmp4 = getelementptr inbounds i32, i32* %ptr2_or_null, i64 %indvars.iv.next
|
|
%tmp5 = load i32, i32* %tmp4, align 4
|
|
%tmp6 = getelementptr inbounds i32, i32* %ptr1_or_null, i64 %indvars.iv.next
|
|
store i32 undef, i32* %tmp6, align 4
|
|
br i1 false, label %.lr.ph, label %.end
|
|
|
|
.end:
|
|
ret void
|
|
}
|