Macintosh-HW/BlueSCSI
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CLZ optimization

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This commit is contained in:
Glenn Anderson 2022-03-05 15:45:47 -08:00
parent 57bf98de06
commit 072c50a7f9
1 changed files with 1 additions and 28 deletions
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29
src/BlueSCSI.cpp
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@ -51,7 +51,6 @@
// 2 for NEC PC98
#define READ_SPEED_OPTIMIZE 1 // Faster reads
#define WRITE_SPEED_OPTIMIZE 1 // Speeding up writes
#define USE_DB2ID_TABLE 1 // Use table to get ID from SEL-DB
// SCSI config
#define NUM_SCSIID 7 // Maximum number of supported SCSI-IDs (The minimum is 0)
@ -232,25 +231,6 @@ static const uint32_t db_bsrr[256]={
//#undef DBP
//#undef PTY
#if USE_DB2ID_TABLE
/* DB to SCSI-ID translation table */
static const byte db2scsiid[256]={
0xff,
0,
1,1,
2,2,2,2,
3,3,3,3,3,3,3,3,
4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
};
#endif
// Log File
#define VERSION "1.1-SNAPSHOT-20220107"
#define LOG_FILENAME "LOG.txt"
@ -1259,14 +1239,7 @@ void loop()
SCSI_BSY_ACTIVE(); // Turn only BSY output ON, ACTIVE
// Ask for a TARGET-ID to respond
#if USE_DB2ID_TABLE
m_id = db2scsiid[scsiid];
//if(m_id==0xff) return;
#else
for(m_id=7;m_id>=0;m_id--)
if(scsiid & (1<<m_id)) break;
//if(m_id<0) return;
#endif
m_id = 31 - __builtin_clz(scsiid);
// Wait until SEL becomes inactive
while(isHigh(gpio_read(SEL)) && isLow(gpio_read(BSY))) {