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A value of all X or Z can be an immediate number

This commit is contained in:
Cary R 2020-07-29 22:55:44 -07:00
parent e69549034d
commit bed4758b0f
1 changed files with 12 additions and 1 deletions
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13
tgt-vvp/eval_expr.c
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2001-2014 Stephen Williams (steve@icarus.com)
* Copyright (c) 2001-2020 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
@ -96,6 +96,17 @@ int number_is_immediate(ivl_expr_t expr, unsigned lim_wid, int negative_ok_flag)
if (pad_bit == '1' && !negative_ok_flag) return 0;
/* Check if all the bits are either x or z. */
if ((bits[0] == 'x') || (bits[0] == 'z')) {
char first_bit = bits[0];
unsigned bits_match = 1;
for (idx = 1 ; idx < nbits ; idx += 1)
if (bits[idx] != first_bit) {
bits_match = 0;
break;
}
if (bits_match) return 1;
}
for (idx = lim_wid ; idx < nbits ; idx += 1)
if (bits[idx] != pad_bit) return 0;