From 7f57bc838517a5660beaf0645d7bb4cc6ed71ce9 Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Sun, 15 Jun 2014 08:48:17 +0200
Subject: [PATCH] Improved parsing of large integer constants

---
 frontends/verilog/const2ast.cc | 39 ++++++++++++++++++++++++----------
 1 file changed, 28 insertions(+), 11 deletions(-)

diff --git a/frontends/verilog/const2ast.cc b/frontends/verilog/const2ast.cc
index c95ce5dc4..8491a6b47 100644
--- a/frontends/verilog/const2ast.cc
+++ b/frontends/verilog/const2ast.cc
@@ -52,6 +52,8 @@ static int my_decimal_div_by_two(std::vector<uint8_t> &digits)
 		carry = digits[i] % 2;
 		digits[i] /= 2;
 	}
+	while (!digits.empty() && !digits.front())
+		digits.erase(digits.begin());
 	return carry;
 }
 
@@ -90,10 +92,15 @@ static void my_strtobin(std::vector<RTLIL::State> &data, const char *str, int le
 
 	if (base == 10) {
 		data.clear();
-		if (len_in_bits < 0)
-			len_in_bits = ceil(digits.size()/log10(2));
-		for (int i = 0; i < len_in_bits; i++)
-			data.push_back(my_decimal_div_by_two(digits) ? RTLIL::S1 : RTLIL::S0);
+		if (len_in_bits < 0) {
+			while (!digits.empty())
+				data.push_back(my_decimal_div_by_two(digits) ? RTLIL::S1 : RTLIL::S0);
+			while (data.size() < 32)
+				data.push_back(RTLIL::S0);
+		} else {
+			for (int i = 0; i < len_in_bits; i++)
+				data.push_back(my_decimal_div_by_two(digits) ? RTLIL::S1 : RTLIL::S0);
+		}
 		return;
 	}
 
@@ -151,20 +158,24 @@ AstNode *VERILOG_FRONTEND::const2ast(std::string code, char case_type)
 	str = code.c_str();
 
 	char *endptr;
-	long intval = strtol(str, &endptr, 10);
+	long len_in_bits = strtol(str, &endptr, 10);
+
+	// Simple base-10 integer
+	if (*endptr == 0) {
+		std::vector<RTLIL::State> data;
+		my_strtobin(data, str, -1, 10, case_type);
+		if (data.back() == RTLIL::S1)
+			data.push_back(RTLIL::S0);
+		return AstNode::mkconst_bits(data, true);
+	}
 
-	// Simple 32 bit integer
-	if (*endptr == 0)
-		return AstNode::mkconst_int(intval, true);
-	
 	// unsized constant
 	if (str == endptr)
-		intval = -1;
+		len_in_bits = -1;
 
 	// The "<bits>'s?[bodh]<digits>" syntax
 	if (*endptr == '\'')
 	{
-		int len_in_bits = intval;
 		std::vector<RTLIL::State> data;
 		bool is_signed = false;
 		if (*(endptr+1) == 's') {
@@ -188,6 +199,12 @@ AstNode *VERILOG_FRONTEND::const2ast(std::string code, char case_type)
 		default:
 			return NULL;
 		}
+		if (len_in_bits < 0) {
+			if (is_signed && data.back() == RTLIL::S1)
+				data.push_back(RTLIL::S0);
+			while (data.size() < 32)
+				data.push_back(RTLIL::S0);
+		}
 		return AstNode::mkconst_bits(data, is_signed);
 	}
 
-- 
2.30.2