teach SCEV that the scale and addition of an inbounds gep don't NSW.
This fixes a FIXME in scev-aa.ll (allowing a new no-alias result) and
generally makes things more precise.
llvm-svn: 125449
diff --git a/llvm/test/Analysis/ScalarEvolution/nsw.ll b/llvm/test/Analysis/ScalarEvolution/nsw.ll
index 010cf60..9d8e2b6 100644
--- a/llvm/test/Analysis/ScalarEvolution/nsw.ll
+++ b/llvm/test/Analysis/ScalarEvolution/nsw.ll
@@ -76,3 +76,31 @@
_ZSt4fillIPiiEvT_S1_RKT0_.exit: ; preds = %entry, %for.cond.for.end_crit_edge.i.i
ret void
}
+
+; Various checks for inbounds geps.
+define void @test3(i32* %begin, i32* %end) nounwind ssp {
+entry:
+ %cmp7.i.i = icmp eq i32* %begin, %end
+ br i1 %cmp7.i.i, label %_ZSt4fillIPiiEvT_S1_RKT0_.exit, label %for.body.i.i
+
+for.body.i.i: ; preds = %entry, %for.body.i.i
+ %indvar.i.i = phi i64 [ %tmp, %for.body.i.i ], [ 0, %entry ]
+; CHECK: %indvar.i.i
+; CHECK: {0,+,1}<nuw><nsw><%for.body.i.i>
+ %tmp = add nsw i64 %indvar.i.i, 1
+; CHECK: %tmp =
+; CHECK: {1,+,1}<nuw><nsw><%for.body.i.i>
+ %ptrincdec.i.i = getelementptr inbounds i32* %begin, i64 %tmp
+; CHECK: %ptrincdec.i.i =
+; CHECK: {(4 + %begin),+,4}<nsw><%for.body.i.i>
+ %__first.addr.08.i.i = getelementptr inbounds i32* %begin, i64 %indvar.i.i
+; CHECK: %__first.addr.08.i.i
+; CHECK: {%begin,+,4}<nsw><%for.body.i.i>
+ store i32 0, i32* %__first.addr.08.i.i, align 4
+ %cmp.i.i = icmp eq i32* %ptrincdec.i.i, %end
+ br i1 %cmp.i.i, label %_ZSt4fillIPiiEvT_S1_RKT0_.exit, label %for.body.i.i
+; CHECK: Loop %for.body.i.i: Unpredictable backedge-taken count.
+; CHECK: Loop %for.body.i.i: Unpredictable max backedge-taken count.
+_ZSt4fillIPiiEvT_S1_RKT0_.exit: ; preds = %for.body.i.i, %entry
+ ret void
+}
\ No newline at end of file