From 1dfbac50e4aa49a59286d2aaf51a6745fb4e5f60 Mon Sep 17 00:00:00 2001
From: Thomas Bauereiss
Date: Sun, 29 Mar 2020 00:34:21 +0000
Subject: Add more mono rewrites for bitvector subranges

---
 lib/mono_rewrites.sail | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

(limited to 'lib')

diff --git a/lib/mono_rewrites.sail b/lib/mono_rewrites.sail
index 81d42663..59359927 100644
--- a/lib/mono_rewrites.sail
+++ b/lib/mono_rewrites.sail
@@ -66,6 +66,12 @@ function slice_zeros_concat (xs, i, l, l') = {
   sail_shiftleft(extzv(l + l', xs), l')
 }
 
+val subrange_zeros_concat : forall 'n 'hi 'lo 'q, 'n >= 0 & 'hi - 'lo + 1 + 'q >= 0.
+  (bits('n), atom('hi), atom('lo), atom('q)) -> bits('hi - 'lo + 1 + 'q) effect pure
+
+function subrange_zeros_concat (xs, hi, lo, l') =
+  slice_zeros_concat(xs, lo, hi - lo + 1, l')
+
 /* Assumes initial vectors are of equal size */
 
 val subrange_subrange_eq : forall 'n, 'n >= 0.
@@ -103,13 +109,19 @@ function place_slice(m,xs,i,l,shift) = {
 }
 
 val set_slice_zeros : forall 'n, 'n >= 0.
-  (atom('n), bits('n), int, int) -> bits('n) effect pure
+  (implicit('n), bits('n), int, int) -> bits('n) effect pure
 
 function set_slice_zeros(n, xs, i, l) = {
   let ys : bits('n) = slice_mask(n, i, l) in
   xs & not_vec(ys)
 }
 
+val set_subrange_zeros : forall 'n, 'n >= 0.
+  (implicit('n), bits('n), int, int) -> bits('n) effect pure
+
+function set_subrange_zeros(n, xs, hi, lo) =
+  set_slice_zeros(n, xs, lo, hi - lo + 1)
+
 val zext_slice : forall 'n 'm, 'n >= 0 & 'm >= 0.
   (implicit('m), bits('n), int, int) -> bits('m) effect pure
 
@@ -118,6 +130,11 @@ function zext_slice(m,xs,i,l) = {
   extzv(m, xs)
 }
 
+val zext_subrange : forall 'n 'm, 'n >= 0 & 'm >= 0.
+  (implicit('m), bits('n), int, int) -> bits('m) effect pure
+
+function zext_subrange(m, xs, i, j) = zext_slice(m, xs, j, i - j + 1)
+
 val sext_slice : forall 'n 'm, 'n >= 0 & 'm >= 0.
   (implicit('m), bits('n), int, int) -> bits('m) effect pure
 
@@ -126,6 +143,11 @@ function sext_slice(m,xs,i,l) = {
   extsv(m, xs)
 }
 
+val sext_subrange : forall 'n 'm, 'n >= 0 & 'm >= 0.
+  (implicit('m), bits('n), int, int) -> bits('m) effect pure
+
+function sext_subrange(m, xs, i, j) = sext_slice(m, xs, j, i - j + 1)
+
 val place_slice_signed : forall 'n 'm, 'n >= 0 & 'm >= 0.
   (implicit('m), bits('n), int, int, int) -> bits('m) effect pure
 
-- 
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