Merge datatype shared selectors/sygus comp 2017 branch. Modify the datatypes decision procedure to share selectors of the same type across multiple constructors. Major rewrite of the SyGuS solver. Adds several new strategies for I/O example problems (PBE) and invariant synthesis. Major simplifications to sygus parsing and synthesis conjecture representation. Do not support check-synth in portfolio. Add sygus regressions.

21 files changed, 531 insertions, 2 deletions

diff --git a/test/regress/regress0/sygus/General_plus10.sy b/test/regress/regress0/sygus/General_plus10.sy
new file mode 100755
index 000000000..ee26fac79
--- /dev/null
+++ b/test/regress/regress0/sygus/General_plus10.sy
@@ -0,0 +1,11 @@
+; EXPECT: unsat
+; COMMAND-LINE: --cegqi-si=all --no-dump-synth
+(set-logic LIA)
+
+(synth-fun fb () Int ((Start Int ((Constant Int)))))
+(synth-fun fc () Int ((Start Int ((Constant Int)))))
+
+(constraint (= fc (+ fb 10))) 
+
+(check-synth)
+
diff --git a/test/regress/regress0/sygus/Makefile.am b/test/regress/regress0/sygus/Makefile.am
index 0764b5d77..0786c3f31 100644
--- a/test/regress/regress0/sygus/Makefile.am
+++ b/test/regress/regress0/sygus/Makefile.am
@@ -50,7 +50,19 @@ TESTS = commutative.sy \
         no-mention.sy \
         max2-univ.sy \
         strings-small.sy \
-        strings-unconstrained.sy
+        strings-unconstrained.sy \
+        tl-type-4x.sy \
+        tl-type-0.sy \
+        fg_polynomial3.sy \
+        icfp_14.12.sy \
+        strings-trivial-simp.sy \
+        icfp_easy-ite.sy \
+        strings-template-infer.sy \
+        strings-trivial.sy \
+        General_plus10.sy \
+        qe.sy \
+        cggmp.sy
+
 
 # sygus tests currently taking too long for make regress
 EXTRA_DIST = $(TESTS) \
diff --git a/test/regress/regress0/sygus/cggmp.sy b/test/regress/regress0/sygus/cggmp.sy
new file mode 100644
index 000000000..1ae1f53c0
--- /dev/null
+++ b/test/regress/regress0/sygus/cggmp.sy
@@ -0,0 +1,23 @@
+; EXPECT: unsat
+; COMMAND-LINE: --sygus-inv-templ=pre --no-dump-synth
+
+(set-logic LIA)
+
+(synth-inv inv-f ((i Int) (j Int)))
+
+(declare-primed-var i Int)
+(declare-primed-var j Int)
+
+(define-fun pre-f ((i Int) (j Int)) Bool
+(and (= i 1)  
+(= j 10)))
+
+(define-fun trans-f ((i Int) (j Int) (i! Int) (j! Int)) Bool
+(and (and (>= j i) (= i! (+ i 2))) (= j! (- j 1))))
+
+(define-fun post-f ((i Int) (j Int)) Bool
+(not (and (< j i) (not (= j 6)))))
+
+(inv-constraint inv-f pre-f trans-f post-f)
+
+(check-synth)
diff --git a/test/regress/regress0/sygus/fg_polynomial3.sy b/test/regress/regress0/sygus/fg_polynomial3.sy
new file mode 100644
index 000000000..dab92bb88
--- /dev/null
+++ b/test/regress/regress0/sygus/fg_polynomial3.sy
@@ -0,0 +1,18 @@
+; EXPECT: unsat
+; COMMAND-LINE: --no-dump-synth
+
+(set-logic LIA)
+
+(synth-fun addExpr1 ((x Int) (y Int)) Int
+)
+
+(synth-fun addExpr2 ((x Int) (y Int)) Int
+)
+
+(declare-var x Int)
+(declare-var y Int)
+
+(constraint (= (+ (addExpr1 x y) (addExpr2 y x)) (- x (+ x y))))
+
+(check-synth)
+
diff --git a/test/regress/regress0/sygus/icfp_14.12.sy b/test/regress/regress0/sygus/icfp_14.12.sy
new file mode 100644
index 000000000..d9c19f8c1
--- /dev/null
+++ b/test/regress/regress0/sygus/icfp_14.12.sy
@@ -0,0 +1,63 @@
+; EXPECT: unsat
+; COMMAND-LINE: --no-dump-synth
+(set-logic BV)
+
+(define-fun shr1 ((x (BitVec 64))) (BitVec 64) (bvlshr x #x0000000000000001))
+(define-fun shr4 ((x (BitVec 64))) (BitVec 64) (bvlshr x #x0000000000000004))
+(define-fun shr16 ((x (BitVec 64))) (BitVec 64) (bvlshr x #x0000000000000010))
+(define-fun shl1 ((x (BitVec 64))) (BitVec 64) (bvshl x #x0000000000000001))
+(define-fun if0 ((x (BitVec 64)) (y (BitVec 64)) (z (BitVec 64))) (BitVec 64) (ite (= x #x0000000000000001) y z))
+
+(synth-fun f ( (x (BitVec 64))) (BitVec 64)
+(
+
+(Start (BitVec 64) (#x0000000000000000 #x0000000000000001 x (bvnot Start)
+                    (shl1 Start)
+ 		    (shr1 Start)
+		    (shr4 Start)
+		    (shr16 Start)
+		    (bvand Start Start)
+		    (bvor Start Start)
+		    (bvxor Start Start)
+		    (bvadd Start Start)
+		    (if0 Start Start Start)
+ ))
+)
+)
+(constraint (= (f #x6E393354DFFAAB51) #xC8E366559002AA57))
+(constraint (= (f #xFDA75AD598A27135) #x812C529533AEC765))
+(constraint (= (f #x58682C0FA4F8DB6D) #xD3CBE9F82D839249))
+(constraint (= (f #x58FDC0941A7E079F) #xD3811FB5F2C0FC30))
+(constraint (= (f #xBDC9B88103ECB0C9) #xA11B23BF7E09A79B))
+(constraint (= (f #x000000000001502F) #xFFFFFFFFFFFF57E8))
+(constraint (= (f #x0000000000010999) #xFFFFFFFFFFFF7B33))
+(constraint (= (f #x0000000000013169) #xFFFFFFFFFFFF674B))
+(constraint (= (f #x000000000001B1A9) #xFFFFFFFFFFFF272B))
+(constraint (= (f #x0000000000016D77) #xFFFFFFFFFFFF4944))
+(constraint (= (f #x0000000000000001) #xFFFFFFFFFFFFFFFF))
+(constraint (= (f #x1ED2E25068744C80) #x0000000000000000))
+(constraint (= (f #x2D2144F9D8CDCBD6) #x0000000000000000))
+(constraint (= (f #xE5D371D100002E8A) #x0000000000000000))
+(constraint (= (f #xADFF6BA34EBDAD72) #x0000000000000000))
+(constraint (= (f #xDA9299B546AAB59A) #x0000000000000000))
+(constraint (= (f #x0000000000015C8A) #x0000000000000000))
+(constraint (= (f #x0000000000017066) #x0000000000000000))
+(constraint (= (f #x000000000001D9D8) #x0000000000000000))
+(constraint (= (f #x00000000000151AE) #x0000000000000000))
+(constraint (= (f #x0000000000017A14) #x0000000000000000))
+(constraint (= (f #xF0F0F0F0F0F0F0F2) #x0000000000000000))
+(constraint (= (f #x83163CFD5DDCCCFB) #xBE74E18151119982))
+(constraint (= (f #xEA31B6A50EF4E399) #x8AE724AD78858E33))
+(constraint (= (f #xE0B1EF549BB6D4B9) #x8FA70855B22495A3))
+(constraint (= (f #x086F9E13A16C363D) #xFBC830F62F49E4E1))
+(constraint (= (f #x2426824D3E67E342) #x0000000000000000))
+(constraint (= (f #xDD518DEFFF18308A) #x0000000000000000))
+(constraint (= (f #x21ECDADB06B3CB03) #xEF0992927CA61A7E))
+(constraint (= (f #x72B1976FBB63A82B) #xC6A73448224E2BEA))
+(constraint (= (f #x16CB47AE0281B27F) #xF49A5C28FEBF26C0))
+(constraint (= (f #x82DE7A1FCA0C0B8F) #xBE90C2F01AF9FA38))
+(constraint (= (f #x0000000000000001) #xFFFFFFFFFFFFFFFF))
+(constraint (= (f #xF0F0F0F0F0F0F0F2) #x0000000000000000))
+(constraint (= (f #x000000000001F0D4) #x0000000000000000))
+(constraint (= (f #x0000000000010067) #xFFFFFFFFFFFF7FCC))
+(check-synth)
diff --git a/test/regress/regress0/sygus/icfp_easy-ite.sy b/test/regress/regress0/sygus/icfp_easy-ite.sy
new file mode 100644
index 000000000..248264698
--- /dev/null
+++ b/test/regress/regress0/sygus/icfp_easy-ite.sy
@@ -0,0 +1,34 @@
+; EXPECT: unsat
+; COMMAND-LINE: --no-dump-synth
+(set-logic BV)
+
+(define-fun shr1 ((x (BitVec 64))) (BitVec 64) (bvlshr x #x0000000000000001))
+(define-fun shr4 ((x (BitVec 64))) (BitVec 64) (bvlshr x #x0000000000000004))
+(define-fun shr16 ((x (BitVec 64))) (BitVec 64) (bvlshr x #x0000000000000010))
+(define-fun shl1 ((x (BitVec 64))) (BitVec 64) (bvshl x #x0000000000000001))
+(define-fun if0 ((x (BitVec 64)) (y (BitVec 64)) (z (BitVec 64))) (BitVec 64) (ite (= x #x0000000000000001) y z))
+
+(synth-fun f ( (x (BitVec 64))) (BitVec 64)
+(
+
+(Start (BitVec 64) (#x0000000000000000 #x0000000000000001 x (bvnot Start)
+                    (shl1 Start)
+ 		    (shr1 Start)
+		    (shr4 Start)
+		    (shr16 Start)
+		    (bvand Start Start)
+		    (bvor Start Start)
+		    (bvxor Start Start)
+		    (bvadd Start Start)
+		    (ite StartBool Start Start)
+ ))
+(StartBool Bool ((= Start #x0000000000000001)))
+)
+)
+(constraint (= (f #x0000000000000001) #x0000000000000001))
+
+(constraint (= (f #x0000000000100001) #x0000000000100001))
+
+(constraint (= (f #xE5D371D100002E8A) #x0000000000000000))
+
+(check-synth)
diff --git a/test/regress/regress0/sygus/qe.sy b/test/regress/regress0/sygus/qe.sy
new file mode 100644
index 000000000..eaff0fd9a
--- /dev/null
+++ b/test/regress/regress0/sygus/qe.sy
@@ -0,0 +1,12 @@
+; EXPECT: unsat
+; COMMAND-LINE: --cegqi-si=all --no-dump-synth
+(set-logic LIA)
+
+(synth-fun f ((x Int)) Int)
+
+(declare-var x Int)
+(declare-var y Int)
+
+(constraint (=> (or (= y 2) (= y 3)) (> (f x) y)))
+
+(check-synth)
diff --git a/test/regress/regress0/sygus/strings-template-infer.sy b/test/regress/regress0/sygus/strings-template-infer.sy
new file mode 100644
index 000000000..498e713e8
--- /dev/null
+++ b/test/regress/regress0/sygus/strings-template-infer.sy
@@ -0,0 +1,16 @@
+; EXPECT: unsat
+; COMMAND-LINE: --no-dump-synth
+(set-logic SLIA)
+ 
+(define-fun cA ((x String) (y String)) String (str.++ (str.++ x "A") y))
+ 
+(synth-fun f ((name String)) String
+    ((Start String (name "A" "B" ""
+                       (cA Start Start)))))
+
+
+(declare-var name String)
+ 
+(constraint (= (f "BB") "AAAAAAAAAAAA"))
+ 
+(check-synth)
diff --git a/test/regress/regress0/sygus/strings-trivial-simp.sy b/test/regress/regress0/sygus/strings-trivial-simp.sy
new file mode 100644
index 000000000..d37ac8bf4
--- /dev/null
+++ b/test/regress/regress0/sygus/strings-trivial-simp.sy
@@ -0,0 +1,14 @@
+; EXPECT: unsat
+; COMMAND-LINE: --no-dump-synth
+(set-logic SLIA)
+ 
+(synth-fun f ((name String)) String
+    ((Start String (name "A" "B"
+                       (str.++ Start Start)))))
+
+
+(declare-var name String)
+ 
+(constraint (= (f "BB") "AAAAAAAAAAAABAAAAAAAABAAA"))
+ 
+(check-synth)
diff --git a/test/regress/regress0/sygus/strings-trivial.sy b/test/regress/regress0/sygus/strings-trivial.sy
new file mode 100644
index 000000000..f4847922d
--- /dev/null
+++ b/test/regress/regress0/sygus/strings-trivial.sy
@@ -0,0 +1,15 @@
+; EXPECT: unsat
+; COMMAND-LINE: --no-dump-synth
+(set-logic SLIA)
+ 
+(synth-fun f ((name String)) String
+    ((Start String (ntString))
+     (ntString String (name "A" "B"
+                       (str.++ ntString ntString)))))
+
+
+(declare-var name String)
+ 
+(constraint (= (f "B") "AAAAAAAAAAAAAAAAAAAAAAAAA"))
+ 
+(check-synth)
diff --git a/test/regress/regress0/sygus/tl-type-0.sy b/test/regress/regress0/sygus/tl-type-0.sy
new file mode 100644
index 000000000..ef046c8e0
--- /dev/null
+++ b/test/regress/regress0/sygus/tl-type-0.sy
@@ -0,0 +1,11 @@
+; EXPECT: unsat
+; COMMAND-LINE: --cegqi-si=none --no-dump-synth
+(set-logic LIA)
+(synth-fun f ((x Int)) Int
+    ((Start Int ((+ Term Term)))
+     (Term Int (x 0))))
+
+(declare-var x Int)
+(constraint (= (f x) 0))
+(check-synth)
+
diff --git a/test/regress/regress0/sygus/tl-type-4x.sy b/test/regress/regress0/sygus/tl-type-4x.sy
new file mode 100644
index 000000000..a18d13052
--- /dev/null
+++ b/test/regress/regress0/sygus/tl-type-4x.sy
@@ -0,0 +1,11 @@
+; EXPECT: unsat
+; COMMAND-LINE: --cegqi-si=none --no-dump-synth
+(set-logic LIA)
+(synth-fun f ((x Int)) Int
+    ((Start Int (Term (+ Start Start)))
+     (Term Int (x 0))))
+
+(declare-var x Int)
+(constraint (= (f x) (* 4 x)))
+(check-synth)
+
diff --git a/test/regress/regress1/sygus/Makefile.am b/test/regress/regress1/sygus/Makefile.am
index 2dff1f1da..f1f1c1342 100644
--- a/test/regress/regress1/sygus/Makefile.am
+++ b/test/regress/regress1/sygus/Makefile.am
@@ -18,7 +18,14 @@ endif
 # put it below in "TESTS +="
 TESTS =	\
 	hd-sdiv.sy \
-	stopwatch-bt.sy
+	stopwatch-bt.sy \
+	array_sum_dd.sy \
+	mpg_guard1-dd.sy \
+	VC22_a.sy \
+	inv_gen_n_c11.sy \
+	unbdd_inv_gen_ex7.sy \
+	icfp_easy_mt_ite.sy \
+  three.sy
 
 EXTRA_DIST = $(TESTS)
 
diff --git a/test/regress/regress1/sygus/VC22_a.sy b/test/regress/regress1/sygus/VC22_a.sy
new file mode 100644
index 000000000..75bed6a28
--- /dev/null
+++ b/test/regress/regress1/sygus/VC22_a.sy
@@ -0,0 +1,60 @@
+; EXPECT: unsat
+; COMMAND-LINE: --no-dump-synth
+(set-logic LIA)
+
+(synth-fun f ((x1 Int) (x2 Int)) Int
+	((Start Int (0 1 x1 x2
+				(ite StartBool Start Start)))
+		(StartBool Bool ((= Start Start)))))
+
+(define-fun vmin () Int 1)
+(define-fun vmax () Int 2)
+
+(define-fun Zero ((v Int)) Bool
+	(= v 0))
+
+(define-fun InV1 ((v Int)) Bool
+	(and (>= v vmin) (<= v vmax)))
+
+(define-fun InV2 ((v1 Int) (v2 Int)) Bool
+	(and (and (and (>= v1 vmin) (<= v1 vmax))
+			(>= v2 vmin)) (<= v2 vmax)))
+
+(define-fun InVorZero ((v Int)) Bool
+	(or (InV1 v) (Zero v)))
+
+
+(define-fun UnsafeSame ((x1 Int) (x2 Int) (v1 Int) (v2 Int)) Bool
+	(or (and (>= x1 x2) (>= (+ x2 v2) (+ x1 v1)))
+		(and (>= x2 x1) (>= (+ x1 v1) (+ x2 v2)))))
+
+(define-fun Unsafe ((x1 Int) (x2 Int) (v1 Int) (v2 Int)) Bool
+	(UnsafeSame x1 x2 v1 v2))
+
+(define-fun BadSame ((x1 Int) (x2 Int)) Bool
+	(= x1 x2))
+
+(define-fun Bad ((x1 Int) (x2 Int)) Bool
+	(BadSame x1 x2))
+
+(declare-var x1 Int)
+(declare-var x2 Int)
+(declare-var v1 Int)
+(declare-var v2 Int)
+
+(constraint (InVorZero (f x1 x2)))
+
+(constraint (or (or (not (InV2 v1 v2))
+			(Zero (f x1 x2)))
+		(and (not (Unsafe x1 x2 (f x1 x2) (f x1 x2)))
+			(not (Zero (f (+ x1 (f x1 x2)) (+ x2 (f x1 x2))))))))
+
+(constraint (or (or (not (InV2 v1 v2))
+			(or (Unsafe x1 x2 v1 v2)
+				(Zero (f (+ x1 v1) (+ x2 v2)))))
+		(not (Zero (f x1 x2)))))
+
+(constraint (or (Bad x1 x2) (not (Zero (f x1 x2)))))
+
+(check-synth)
+
diff --git a/test/regress/regress1/sygus/array_sum_dd.sy b/test/regress/regress1/sygus/array_sum_dd.sy
new file mode 100644
index 000000000..dacd7347d
--- /dev/null
+++ b/test/regress/regress1/sygus/array_sum_dd.sy
@@ -0,0 +1,11 @@
+; EXPECT: unsat
+; COMMAND-LINE: --no-dump-synth
+(set-logic LIA)
+(synth-fun findSum ( (y1 Int) (y2 Int) )Int (
+(Start Int ( 0 1 y1 y2 (+ Start Start) (ite BoolExpr Start Start))) 
+(BoolExpr Bool ((< Start Start) (<= Start Start)))))
+(declare-var x1 Int)
+(declare-var x2 Int)
+(constraint (=> (> (+ x1 x2) 0) (= (findSum x1 x2 ) x1)))
+(constraint (=> (<= (+ x1 x2) 0) (= (findSum x1 x2 ) x2)))
+(check-synth)
diff --git a/test/regress/regress1/sygus/icfp_easy_mt_ite.sy b/test/regress/regress1/sygus/icfp_easy_mt_ite.sy
new file mode 100644
index 000000000..b7428fd51
--- /dev/null
+++ b/test/regress/regress1/sygus/icfp_easy_mt_ite.sy
@@ -0,0 +1,32 @@
+; EXPECT: unsat
+; COMMAND-LINE: --no-dump-synth
+(set-logic BV)
+
+(define-fun shr1 ((x (BitVec 64))) (BitVec 64) (bvlshr x #x0000000000000001))
+(define-fun shr4 ((x (BitVec 64))) (BitVec 64) (bvlshr x #x0000000000000004))
+(define-fun shr16 ((x (BitVec 64))) (BitVec 64) (bvlshr x #x0000000000000010))
+(define-fun shl1 ((x (BitVec 64))) (BitVec 64) (bvshl x #x0000000000000001))
+(define-fun if0 ((x (BitVec 64)) (y (BitVec 64)) (z (BitVec 64))) (BitVec 64) (ite (= x #x0000000000000001) y z))
+
+(synth-fun f ( (x (BitVec 64))) (BitVec 64)
+(
+
+(Start (BitVec 64) (#x0000000000000000 #x0000000000000001 x (bvnot Start)
+                    (shl1 Start)
+ 		    (shr1 Start)
+		    (shr4 Start)
+		    (shr16 Start)
+		    (bvand Start Start)
+		    (bvor Start Start)
+		    (bvxor Start Start)
+		    (bvadd Start Start)
+		    (ite StartBool Start Start)
+ ))
+(StartBool Bool ((= Start #x0000000000000001)))
+)
+)
+(constraint (= (f #x6E393354DFFAAB51) #xC8E366559002AA57))
+
+(constraint (= (f #xE5D371D100002E8A) #x0000000000000000))
+
+(check-synth)
diff --git a/test/regress/regress1/sygus/inv_gen_fig8.sy b/test/regress/regress1/sygus/inv_gen_fig8.sy
new file mode 100644
index 000000000..5496f3c0a
--- /dev/null
+++ b/test/regress/regress1/sygus/inv_gen_fig8.sy
@@ -0,0 +1,46 @@
+; EXPECT: unsat
+; COMMAND-LINE: --no-dump-synth
+(set-logic LIA)
+(synth-fun inv ((l Int)) Bool
+    (
+        (Start Bool ((and AtomicFormula AtomicFormula)
+                     (or AtomicFormula AtomicFormula)))
+        (AtomicFormula Bool ((<= Sum Const) (= Sum Const)))
+        (Sum Int ((+ Term Term)))
+        (Term Int ((* Sign Var)))
+        (Sign Int (0 1 -1))
+        (Var Int (l))
+        (Const Int (-3 -2 -1 0 1 2 3))
+    )
+)
+
+(define-fun implies ((b1 Bool) (b2 Bool)) Bool (or (not b1) b2))
+(define-fun and3 ((b1 Bool) (b2 Bool) (b3 Bool)) Bool (and (and b1 b2) b3))
+(define-fun and4 ((b1 Bool) (b2 Bool) (b3 Bool) (b4 Bool)) Bool (and (and3 b1 b2 b3) b4))
+(define-fun and5 ((b1 Bool) (b2 Bool) (b3 Bool) (b4 Bool) (b5 Bool)) Bool (and (and4 b1 b2 b3 b4) b5))
+(define-fun and6 ((b1 Bool) (b2 Bool) (b3 Bool) (b4 Bool) (b5 Bool) (b6 Bool)) Bool (and (and5 b1 b2 b3 b4 b5) b6))
+(define-fun or3 ((b1 Bool) (b2 Bool) (b3 Bool)) Bool (or (or b1 b2) b3))
+(define-fun or4 ((b1 Bool) (b2 Bool) (b3 Bool) (b4 Bool)) Bool (or (or3 b1 b2 b3) b4))
+(define-fun or5 ((b1 Bool) (b2 Bool) (b3 Bool) (b4 Bool) (b5 Bool)) Bool (or (or4 b1 b2 b3 b4) b5))
+
+(declare-var x0 Int)
+(declare-var x1 Int)
+(declare-var x2 Int)
+(declare-var x3 Int)
+(declare-var x4 Int)
+(declare-var l Int)
+(declare-var x0p Int)
+(declare-var x1p Int)
+(declare-var x2p Int)
+(declare-var x3p Int)
+(declare-var x4p Int)
+
+(constraint (implies (and6 (= l 0) (or (= x0p (+ x0 1)) (= x0p (- x0 1))) 
+				  (or (= x1p (+ x1 1)) (= x1p (- x1 1)))
+				  (or (= x2p (+ x2 1)) (= x2p (- x2 1)))
+				  (or (= x3p (+ x3 1)) (= x3p (- x3 1)))
+				  (or (= x4p (+ x4 1)) (= x4p (- x4 1)))) 
+		     (inv l)))
+(constraint (implies (and (inv l) (not (= l 0))) false))
+
+(check-synth)
diff --git a/test/regress/regress1/sygus/inv_gen_n_c11.sy b/test/regress/regress1/sygus/inv_gen_n_c11.sy
new file mode 100644
index 000000000..946f284cb
--- /dev/null
+++ b/test/regress/regress1/sygus/inv_gen_n_c11.sy
@@ -0,0 +1,36 @@
+; EXPECT: unsat
+; COMMAND-LINE: --no-dump-synth
+(set-logic LIA)
+(synth-fun inv ((i Int) (l Int)) Bool
+    (
+        (Start Bool ((and AtomicFormula AtomicFormula)
+                     (or AtomicFormula AtomicFormula)))
+        (AtomicFormula Bool ((<= Sum Const) (= Sum Const)))
+        (Sum Int ((+ Term Term)))
+        (Term Int ((* Sign Var)))
+        (Sign Int (0 1 -1))
+        (Var Int (i l))
+        (Const Int (-7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7))
+    )
+)
+
+(define-fun implies ((b1 Bool) (b2 Bool)) Bool (or (not b1) b2))
+(define-fun and3 ((b1 Bool) (b2 Bool) (b3 Bool)) Bool (and (and b1 b2) b3))
+(define-fun and4 ((b1 Bool) (b2 Bool) (b3 Bool) (b4 Bool)) Bool (and (and3 b1 b2 b3) b4))
+(define-fun and5 ((b1 Bool) (b2 Bool) (b3 Bool) (b4 Bool) (b5 Bool)) Bool (and (and4 b1 b2 b3 b4) b5))
+(define-fun and6 ((b1 Bool) (b2 Bool) (b3 Bool) (b4 Bool) (b5 Bool) (b6 Bool)) Bool (and (and5 b1 b2 b3 b4 b5) b6))
+(define-fun or3 ((b1 Bool) (b2 Bool) (b3 Bool)) Bool (or (or b1 b2) b3))
+(define-fun or4 ((b1 Bool) (b2 Bool) (b3 Bool) (b4 Bool)) Bool (or (or3 b1 b2 b3) b4))
+(define-fun or5 ((b1 Bool) (b2 Bool) (b3 Bool) (b4 Bool) (b5 Bool)) Bool (or (or4 b1 b2 b3 b4) b5))
+
+(declare-var i Int)
+(declare-var l Int)
+(declare-var i1 Int)
+(declare-var l1 Int)
+(declare-var l2 Int)
+
+(constraint (implies (= l 0) (inv i l)))
+(constraint (implies (and5 (inv i l) (implies (= l 4) (= l1 0)) (implies (not (= l 4)) (= l1 l)) (not (or (< l1 0) (>= l1 5))) (= l2 (+ l1 1))) (inv i l2)))
+(constraint (implies (and4 (inv i l) (implies (= l 4) (= l1 0)) (implies (not (= l 4)) (= l1 l)) (or (< l1 0) (>= l1 5))) false))
+
+(check-synth)
diff --git a/test/regress/regress1/sygus/mpg_guard1-dd.sy b/test/regress/regress1/sygus/mpg_guard1-dd.sy
new file mode 100644
index 000000000..e574f7eb6
--- /dev/null
+++ b/test/regress/regress1/sygus/mpg_guard1-dd.sy
@@ -0,0 +1,27 @@
+; EXPECT: unsat
+; COMMAND-LINE: --no-dump-synth
+(set-logic LIA)
+
+(synth-fun eq1 ( (x Int) (y Int) ) Int
+    ((Start Int (x
+                 y
+                 0
+                 (+ Start Start)
+                 (- Start Start)
+                 (ite StartBool Start Start)))
+     (StartBool Bool ((and StartBool StartBool)
+                      (<=  Start Start)
+                      (=   Start Start)))))
+
+(define-fun iteB (( b1 Bool ) (b2 Bool ) (b3 Bool )) Bool (or (and b1 b2) (and (not b1) b3)))
+
+(declare-var x Int) 
+(declare-var y Int) 
+
+(constraint (iteB (>= x 0) 
+                  (= (eq1 x y) (+ x x))
+		              (= (eq1 x y) x)
+))
+
+(check-synth)
+
diff --git a/test/regress/regress1/sygus/three.sy b/test/regress/regress1/sygus/three.sy
new file mode 100644
index 000000000..6e2ce3a2c
--- /dev/null
+++ b/test/regress/regress1/sygus/three.sy
@@ -0,0 +1,30 @@
+; EXPECT: unsat
+; COMMAND-LINE: --no-dump-synth 
+
+(set-logic LIA)
+
+(synth-fun f ((x Int)) Int
+    ((Start Int (
+                 x
+                 3
+                 7
+                 10
+                 (* Start Start)
+                 (mod Start Start)))))
+
+(declare-var x Int)
+
+(constraint (= (f x) (f (+ x 10))))
+(constraint (= (f 1) 3))
+(constraint (= (f 2) 6))
+(constraint (= (f 3) 9))
+(constraint (= (f 4) 2))
+(constraint (= (f 5) 5))
+(constraint (= (f 6) 8))
+(constraint (= (f 7) 1))
+(constraint (= (f 8) 4))
+(constraint (= (f 9) 7))
+(constraint (= (f 0) 0))
+
+(check-synth)
+
diff --git a/test/regress/regress1/sygus/unbdd_inv_gen_ex7.sy b/test/regress/regress1/sygus/unbdd_inv_gen_ex7.sy
new file mode 100644
index 000000000..f840fa519
--- /dev/null
+++ b/test/regress/regress1/sygus/unbdd_inv_gen_ex7.sy
@@ -0,0 +1,40 @@
+; EXPECT: unsat
+; COMMAND-LINE: --no-dump-synth
+(set-logic LIA)
+(synth-fun inv ((i Int) (y Int) (l Int)) Bool
+    (
+        (Start Bool ((and AtomicFormula AtomicFormula)
+                     (or AtomicFormula AtomicFormula)))
+        (AtomicFormula Bool ((<= Sum Const) (= Sum Const)))
+        (Sum Int ((+ Term Term)))
+        (Term Int ((* Sign Var)))
+        (Sign Int (0 1 -1))
+        (Var Int (i y l))
+        (Const Int ((+ Const Const) (- Const Const) 0 1))
+    )
+)
+
+(define-fun implies ((b1 Bool) (b2 Bool)) Bool (or (not b1) b2))
+(define-fun and3 ((b1 Bool) (b2 Bool) (b3 Bool)) Bool (and (and b1 b2) b3))
+(define-fun and4 ((b1 Bool) (b2 Bool) (b3 Bool) (b4 Bool)) Bool (and (and3 b1 b2 b3) b4))
+(define-fun and5 ((b1 Bool) (b2 Bool) (b3 Bool) (b4 Bool) (b5 Bool)) Bool (and (and4 b1 b2 b3 b4) b5))
+(define-fun and6 ((b1 Bool) (b2 Bool) (b3 Bool) (b4 Bool) (b5 Bool) (b6 Bool)) Bool (and (and5 b1 b2 b3 b4 b5) b6))
+(define-fun or3 ((b1 Bool) (b2 Bool) (b3 Bool)) Bool (or (or b1 b2) b3))
+(define-fun or4 ((b1 Bool) (b2 Bool) (b3 Bool) (b4 Bool)) Bool (or (or3 b1 b2 b3) b4))
+(define-fun or5 ((b1 Bool) (b2 Bool) (b3 Bool) (b4 Bool) (b5 Bool)) Bool (or (or4 b1 b2 b3 b4) b5))
+
+(declare-var i Int)
+(declare-var x Int)
+(declare-var y Int)
+(declare-var l Int)
+(declare-var i1 Int)
+(declare-var x1 Int)
+(declare-var y1 Int)
+(declare-var l1 Int)
+
+(constraint (implies (or3 (< x 0) (< y 0) (> y x)) true))
+(constraint (implies (and3 (not (or3 (< x 0) (< y 0) (> y x))) (= l x) (= i 0)) (inv i y l)))
+(constraint (implies (and4 (inv i y l) (< i y) (not (or (< i 0) (>= i l))) (= i1 (+ i 1))) (inv i1 y l)))
+(constraint (implies (and3 (inv i y l) (< i y) (or (< i 0) (>= i  l))) false))
+
+(check-synth)