1 files changed, 56 insertions, 0 deletions
diff --git a/test/Transforms/IndVarSimplify/overflowcheck.ll b/test/Transforms/IndVarSimplify/overflowcheck.ll
new file mode 100644
index 000000000000..2603f363ab60
--- /dev/null
+++ b/test/Transforms/IndVarSimplify/overflowcheck.ll
@@ -0,0 +1,56 @@
+; RUN: opt < %s -indvars -liv-reduce -S | FileCheck %s
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
+target triple = "x86_64-apple-macosx"
+
+; CHECK-LABEL: @addwithoverflow
+; CHECK-LABEL: loop1:
+; CHECK-NOT: zext
+; CHECK: add nsw
+; CHECK: @llvm.sadd.with.overflow
+; CHECK-LABEL: loop2:
+; CHECK-NOT: extractvalue
+; CHECK: add nuw nsw
+; CHECK: @llvm.sadd.with.overflow
+; CHECK-LABEL: loop3:
+; CHECK-NOT: extractvalue
+; CHECK: ret
+define i64 @addwithoverflow(i32 %n, i64* %a) {
+entry:
+  br label %loop0
+
+loop0:
+  %i = phi i32 [ 0, %entry ], [ %i1val, %loop3 ]
+  %s = phi i32 [ 0, %entry ], [ %addsval, %loop3 ]
+  %bc = icmp ult i32 %i, %n
+  br i1 %bc, label %loop1, label %exit
+
+loop1:
+  %zxt = zext i32 %i to i64
+  %ofs = shl nuw nsw i64 %zxt, 3
+  %gep = getelementptr i64* %a, i64 %zxt
+  %v = load i64* %gep, align 8
+  %truncv = trunc i64 %v to i32
+  %adds = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %s, i32 %truncv)
+  %ovflows = extractvalue { i32, i1 } %adds, 1
+  br i1 %ovflows, label %exit, label %loop2
+
+loop2:
+  %addsval = extractvalue { i32, i1 } %adds, 0
+  %i1 = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 %i, i32 1)
+  %i1check = extractvalue { i32, i1 } %i1, 1
+  br i1 %i1check, label %exit, label %loop3
+
+loop3:
+  %i1val = extractvalue { i32, i1 } %i1, 0
+  %test = icmp slt i32 %i1val, %n
+  br i1 %test, label %return, label %loop0
+
+return:
+  %ret = zext i32 %addsval to i64
+  ret i64 %ret
+
+exit:
+  unreachable
+}
+
+declare { i32, i1 } @llvm.sadd.with.overflow.i32(i32, i32)