From: Lukasz Dalek <ldalek@antmicro.com>
Date: Tue, 23 Jun 2020 16:50:50 +0000 (+0200)
Subject: Support missing xor-assign operator
X-Git-Tag: working-ls180~445^2~4
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=a4b4c22c962e2971a093da9cf2364ec19050dd32;p=yosys.git

Support missing xor-assign operator

Signed-off-by: Lukasz Dalek <ldalek@antmicro.com>
---

diff --git a/frontends/verilog/verilog_lexer.l b/frontends/verilog/verilog_lexer.l
index c77da4274..8c9f403a3 100644
--- a/frontends/verilog/verilog_lexer.l
+++ b/frontends/verilog/verilog_lexer.l
@@ -528,6 +528,7 @@ import[ \t\r\n]+\"(DPI|DPI-C)\"[ \t\r\n]+function[ \t\r\n]+ {
 
 "|=" { SV_KEYWORD(TOK_OR_ASSIGN); }
 "+=" { SV_KEYWORD(TOK_PLUS_ASSIGN); }
+"^=" { SV_KEYWORD(TOK_XOR_ASSIGN); }
 
 [-+]?[=*]> {
 	if (!specify_mode) REJECT;
diff --git a/frontends/verilog/verilog_parser.y b/frontends/verilog/verilog_parser.y
index e8b74cf83..4c2a78809 100644
--- a/frontends/verilog/verilog_parser.y
+++ b/frontends/verilog/verilog_parser.y
@@ -259,7 +259,7 @@ static void rewriteAsMemoryNode(AstNode *node, AstNode *rangeNode)
 %token TOK_INTEGER TOK_SIGNED TOK_ASSIGN TOK_PLUS_ASSIGN TOK_ALWAYS TOK_INITIAL
 %token TOK_ALWAYS_FF TOK_ALWAYS_COMB TOK_ALWAYS_LATCH
 %token TOK_BEGIN TOK_END TOK_IF TOK_ELSE TOK_FOR TOK_WHILE TOK_REPEAT
-%token TOK_DPI_FUNCTION TOK_POSEDGE TOK_NEGEDGE TOK_OR TOK_OR_ASSIGN TOK_AUTOMATIC
+%token TOK_DPI_FUNCTION TOK_POSEDGE TOK_NEGEDGE TOK_OR TOK_OR_ASSIGN TOK_XOR_ASSIGN TOK_AUTOMATIC
 %token TOK_CASE TOK_CASEX TOK_CASEZ TOK_ENDCASE TOK_DEFAULT
 %token TOK_FUNCTION TOK_ENDFUNCTION TOK_TASK TOK_ENDTASK TOK_SPECIFY
 %token TOK_IGNORED_SPECIFY TOK_ENDSPECIFY TOK_SPECPARAM TOK_SPECIFY_AND TOK_IGNORED_SPECIFY_AND
@@ -2335,6 +2335,14 @@ simple_behavioral_stmt:
 		SET_AST_NODE_LOC(node, @2, @5);
 		append_attr(node, $1);
 	} |
+	attr lvalue TOK_XOR_ASSIGN delay expr {
+		AstNode *xor_node = new AstNode(AST_BIT_XOR, $2->clone(), $5);
+		AstNode *node = new AstNode(AST_ASSIGN_EQ, $2, xor_node);
+		SET_AST_NODE_LOC(xor_node, @2, @5);
+		SET_AST_NODE_LOC(node, @2, @5);
+		ast_stack.back()->children.push_back(node);
+		append_attr(node, $1);
+	} |
 	attr lvalue TOK_OR_ASSIGN delay expr {
 		AstNode *or_node = new AstNode(AST_BIT_OR, $2->clone(), $5);
 		SET_AST_NODE_LOC(or_node, @2, @5);