4 files changed, 19 insertions, 3 deletions
diff --git a/lib/rts.c b/lib/rts.c
index 84ff4916..97aad8a4 100644
--- a/lib/rts.c
+++ b/lib/rts.c
@@ -208,7 +208,7 @@ void kill_mem()
 
 // ***** Memory builtins *****
 
-unit write_ram(const mpz_t addr_size,     // Either 32 or 64
+bool write_ram(const mpz_t addr_size,     // Either 32 or 64
 	       const mpz_t data_size_mpz, // Number of bytes
 	       const sail_bits  hex_ram,       // Currently unused
 	       const sail_bits  addr_bv,
@@ -231,7 +231,7 @@ unit write_ram(const mpz_t addr_size,     // Either 32 or 64
   }
 
   mpz_clear(buf);
-  return UNIT;
+  return true;
 }
 
 void read_ram(sail_bits *data,
diff --git a/lib/rts.h b/lib/rts.h
index cedb555e..98bbd078 100644
--- a/lib/rts.h
+++ b/lib/rts.h
@@ -53,7 +53,7 @@ uint64_t read_mem(uint64_t);
 // These memory builtins are intended to match the semantics for the
 // __ReadRAM and __WriteRAM functions in ASL.
 
-unit write_ram(const mpz_t addr_size,     // Either 32 or 64
+bool write_ram(const mpz_t addr_size,     // Either 32 or 64
 	       const mpz_t data_size_mpz, // Number of bytes
 	       const sail_bits hex_ram,       // Currently unused
 	       const sail_bits addr_bv,
diff --git a/lib/sail.c b/lib/sail.c
index 4cb9cdc1..38c8c273 100644
--- a/lib/sail.c
+++ b/lib/sail.c
@@ -781,6 +781,19 @@ void shift_bits_right_arith(sail_bits *rop, const sail_bits op1, const sail_bits
   }
 }
 
+void shiftl(sail_bits *rop, const sail_bits op1, const sail_int op2)
+{
+  rop->len = op1.len;
+  mpz_mul_2exp(*rop->bits, *op1.bits, mpz_get_ui(op2));
+  normalize_sail_bits(rop);
+}
+
+void shiftr(sail_bits *rop, const sail_bits op1, const sail_int op2)
+{
+  rop->len = op1.len;
+  mpz_tdiv_q_2exp(*rop->bits, *op1.bits, mpz_get_ui(op2));
+}
+
 void reverse_endianness(sail_bits *rop, const sail_bits op)
 {
   rop->len = op.len;
diff --git a/lib/sail.h b/lib/sail.h
index bbdccd09..9ce3ec6b 100644
--- a/lib/sail.h
+++ b/lib/sail.h
@@ -273,6 +273,9 @@ void shift_bits_left(sail_bits *rop, const sail_bits op1, const sail_bits op2);
 void shift_bits_right(sail_bits *rop, const sail_bits op1, const sail_bits op2);
 void shift_bits_right_arith(sail_bits *rop, const sail_bits op1, const sail_bits op2);
 
+void shiftl(sail_bits *rop, const sail_bits op1, const sail_int op2);
+void shiftr(sail_bits *rop, const sail_bits op1, const sail_int op2);
+
 void reverse_endianness(sail_bits*, sail_bits);
 
 /* ***** Sail reals ***** */