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vlog95: trim binary constants to save space and emit size of undef. consts. 

This should not change the functionality, but to save space trim any
unneeded bits from a binary constant. Also for the case of emitting
a signed undefined value when the allow signed flag is not set add
the width to the constant.
This commit is contained in:
Cary R 2014-12-08 12:59:58 -08:00
parent c28188618b
commit f0a0ab100f
1 changed files with 10 additions and 3 deletions
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13
tgt-vlog95/numbers.c
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@ -78,6 +78,7 @@ static void emit_bits(const char *bits, unsigned nbits, unsigned is_signed)
{
unsigned has_undef = 0;
assert(nbits > 0);
/* Check for an undefined bit. */
for (int idx = (int)nbits-1; idx >= 0; idx -= 1) {
if ((bits[idx] != '0') && (bits[idx] != '1')) {
@ -91,8 +92,14 @@ static void emit_bits(const char *bits, unsigned nbits, unsigned is_signed)
/* Emit as a binary constant. */
if (has_undef || (nbits < 2)) {
int start = nbits - 1;
char sbit = bits[start];
/* Trim extra leading bits. */
if (! is_signed && (sbit == '1')) sbit = ' ';
while (start && (sbit == bits[start-1])) start -= 1;
/* Print the trimmed value. */
fprintf(vlog_out, "b");
for (int idx = (int)nbits-1; idx >= 0; idx -= 1) {
for (int idx = start; idx >= 0; idx -= 1) {
fprintf(vlog_out, "%c", bits[idx]);
}
/* Emit as a hex constant. */
@ -152,9 +159,9 @@ void emit_number(const char *bits, unsigned nbits, unsigned is_signed,
vlog_errors += 1;
return;
} else if (rtype == -2) {
fprintf(vlog_out, "'bz");
fprintf(vlog_out, "%u'bz", nbits);
} else if (rtype == -3) {
fprintf(vlog_out, "'bx");
fprintf(vlog_out, "%u'bx", nbits);
} else {
fprintf(vlog_out, "%"PRId32, value);
}