From caa652ae2b3da86de945fa8d5ece55ddbbb2cf31 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Wed, 30 Jul 2025 16:34:48 -0400
Subject: oasm: Introduce logical shift operations

This commit introduces LSR/LSL which are used as bitwise shift
operations.

--
lsr x1, #1   !! x1 >>= 1
lsl x1, #1   !! x1 <<= 1
--

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 usr.bin/oasm/parse.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

(limited to 'usr.bin/oasm/parse.c')

diff --git a/usr.bin/oasm/parse.c b/usr.bin/oasm/parse.c
index ce5a446..042cce8 100644
--- a/usr.bin/oasm/parse.c
+++ b/usr.bin/oasm/parse.c
@@ -51,7 +51,9 @@ static const char *tokstr[] = {
     [ TT_DEC ] = "dec",
     [ TT_MOV ] = "mov",
     [ TT_IMM ]  = "<imm>",
-    [ TT_LABEL] = "<label>",
+    [ TT_LABEL ] = "<label>",
+    [ TT_LSR ] = "lsr",
+    [ TT_LSL ] = "lsl",
 
     /* Bitwise */
     [ TT_MROB ] = "mrob",
@@ -129,6 +131,8 @@ parse_reg(struct oasm_state *state, struct oasm_token *tok)
     case TT_AND:
     case TT_OR:
     case TT_XOR:
+    case TT_LSR:
+    case TT_LSL:
         state->last = tok->type;
         break;
     default:
@@ -195,6 +199,14 @@ parse_tok(struct oasm_state *state, struct oasm_token *tok)
         state->last = tok->type;
         emit_osmx64(&emit_state, tok);
         break;
+    case TT_LSR:
+        state->last = tok->type;
+        emit_osmx64(&emit_state, tok);
+        break;
+    case TT_LSL:
+        state->last = tok->type;
+        emit_osmx64(&emit_state, tok);
+        break;
     case TT_MOV:
         state->last = tok->type;
         emit_osmx64(&emit_state, tok);
-- 
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