2 files changed, 9 insertions, 0 deletions
diff --git a/simplify.c b/simplify.c
index 25e2a41c..09cbe16d 100644
--- a/simplify.c
+++ b/simplify.c
@@ -668,6 +668,8 @@ static int simplify_constant_rightside(struct instruction *insn)
 	case OP_AND:
 		if (!value)
 			return replace_with_pseudo(insn, insn->src2);
+		if ((value & bits) == bits)
+			return replace_with_pseudo(insn, insn->src1);
 		return 0;
 
 	case OP_SET_NE:
diff --git a/validation/optim/bits-not-zero.c b/validation/optim/bits-not-zero.c
index 9872794b..ce74705e 100644
--- a/validation/optim/bits-not-zero.c
+++ b/validation/optim/bits-not-zero.c
@@ -1,4 +1,5 @@
 int  or_not0(int a) { return a | ~0; }
+int and_not0(int a) { return a & ~0; }
 
 /*
  * check-name: bool-not-zero
@@ -11,5 +12,11 @@ or_not0:
 	ret.32      $0xffffffff
 
 
+and_not0:
+.L2:
+	<entry-point>
+	ret.32      %arg1
+
+
  * check-output-end
  */