Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/llvm/test/Transforms/InstCombine/2008-07-13-DivZero.ll

@@ -0,0 +1,16 @@
+; RUN: opt < %s -instcombine -S | grep "lshr.*3"
+; RUN: opt < %s -instcombine -S | grep "call .*%cond"
+; PR2506
+
+; We can simplify the operand of udiv to '8', but not the operand to the
+; call.  If the callee never returns, we can't assume the div is reachable.
+define i32 @a(i32 %x, i32 %y) {
+entry:
+        %tobool = icmp ne i32 %y, 0             ; <i1> [#uses=1]
+        %cond = select i1 %tobool, i32 8, i32 0         ; <i32> [#uses=2]
+        %call = call i32 @b( i32 %cond )                ; <i32> [#uses=0]
+        %div = udiv i32 %x, %cond               ; <i32> [#uses=1]
+        ret i32 %div
+}
+
+declare i32 @b(i32)