static void insertMaskField(uint32_t *instruction, TR::InstOpCode::Mnemonic op, int64_t lmask)
{
int32_t encoding;
// A mask is is a string of 1 bits surrounded by a string of 0 bits.
// For word instructions it is specified through its start and stop bit
// numbers. Note - the mask is considered circular so the start bit
// number may be greater than the stop bit number.
// Examples: input start stop
// 00FFFF00 8 23
// 00000001 31 31
// 80000001 31 0
// FFFFFFFF 0 31 (somewhat arbitrary)
// 00000000 ? ? (illegal)
//
// For doubleword instructions only one of the start bit or stop bit is
// specified and the other is implicit in the instruction. The bit
// number is strangely encoded in that the low order bit 5 comes first
// and the high order bits after. The field is in bit positions 21-26.
// For these instructions the immediate is not a mask but a 1-bit immediate operand
if (op == TR::InstOpCode::cmprb)
{
// populate 1-bit L field
encoding = (((uint32_t)lmask) & 0x1) << 21;
*instruction |= encoding;
return;
}
// For these instructions the immediate is not a mask but a 2-bit immediate operand
if (op == TR::InstOpCode::xxpermdi ||
op == TR::InstOpCode::xxsldwi)
{
encoding = (((uint32_t)lmask) & 0x3) << 8;
*instruction |= encoding;
return;
}
if (op == TR::InstOpCode::addex ||
op == TR::InstOpCode::addex_r)
{
encoding = (((uint32_t)lmask) & 0x3) << 9;
*instruction |= encoding;
return;
}
// For these instructions the immediate is not a mask but a 4-bit immediate operand
if (op == TR::InstOpCode::vsldoi)
{
encoding = (((uint32_t)lmask) & 0xf)<< 6;
*instruction |= encoding;
return;
}
TR::InstOpCode opCode(op);
if (opCode.isCRLogical())
{
encoding = (((uint32_t) lmask) & 0xffffffff);
*instruction |= encoding;
return;
}
TR_ASSERT(lmask, "A mask of 0 cannot be encoded");
if (opCode.isDoubleWord())
{
int bitnum;
if (opCode.useMaskEnd())
{
TR_ASSERT(contiguousBits(lmask) &&
((lmask & CONSTANT64(0x8000000000000000)) != 0) &&
((lmask == -1) || ((lmask & 0x1) == 0)),
"Bad doubleword mask for ME encoding");
bitnum = leadingOnes(lmask) - 1;
}
else
{
bitnum = leadingZeroes(lmask);
// assert on cases like 0xffffff00000000ff
TR_ASSERT((bitnum != 0) || (lmask == -1) || ((lmask & 0x1) == 0) ||
(op!=TR::InstOpCode::rldic &&
op!=TR::InstOpCode::rldimi &&
op!=TR::InstOpCode::rldic_r &&
op!=TR::InstOpCode::rldimi_r),
"Cannot handle wrap-around, check mask for correctness");
}
encoding = ((bitnum&0x1f)<<6) | ((bitnum&0x20));
}
else // single word
{
// special case the 3-bit rounding mode fields
if (op == TR::InstOpCode::drrnd || op == TR::InstOpCode::dqua)
{
encoding = (lmask << 9) & 0x600;
}
else
{
int32_t mask = lmask&0xffffffff;
int32_t maskBegin;
int32_t maskEnd;
maskBegin = leadingZeroes(~mask & (2*mask));
maskBegin = (maskBegin + (maskBegin != 32)) & 0x1f;
maskEnd = leadingZeroes(mask & ~(2*mask));
encoding = 32*maskBegin + maskEnd << 1; // shift encrypted mask into position
}
}
*instruction |= encoding;
}
const char *TR::DebugCounter::debugCounterBucketName(TR::Compilation *comp, int32_t value, const char *format, ...)
{
if (!comp->getOptions()->enableDebugCounters())
{
return NULL;
}
TR::StackMemoryRegion stackMemoryRegion(*comp->trMemory());
char *bucketFormat = (char*)comp->trMemory()->allocateStackMemory(strlen(format) + 40); // appending "=%d..%d" where each %d could be 11 characters
int32_t low = value;
int32_t high = value;
if (value != 0 && comp->getOptions()->getDebugCounterBucketGranularity() >= 1)
{
const int32_t magnitude = abs(value);
low = high = magnitude;
const int32_t granularity = comp->getOptions()->getDebugCounterBucketGranularity();
const double bucketRatio = pow(2.0, 1.0 / granularity); // TODO: calculate once
const int32_t logLow = (int)(log((double)magnitude)/log(bucketRatio));
// Figure out which bucket sizing algorithm to use
//
const int32_t log2magnitude = 31-leadingZeroes(magnitude); // floor
const int32_t doublingInterval = 1 << log2magnitude;
if (doublingInterval <= granularity)
{
// Tiny buckets degenerate to one value per bucket
high = low;
}
else
{
// We do this with some buckets of size smallBucketSize, plus
// some that are 1 larger.
// We'd like to make sure make sure the smaller ones come
// before bigger ones (eg. we want to see 8-9, 10-12, 13-15
// rather than 8-10, 11-12, 13-15)
//
low = 1 << log2magnitude; // power-of-two starting point
int32_t smallBucketSize = doublingInterval / granularity;
int32_t numBigBuckets = doublingInterval - smallBucketSize * granularity;
int32_t numSmallBuckets = granularity - numBigBuckets;
int32_t totalSmallBucketSize = numSmallBuckets * smallBucketSize;
int32_t offset = magnitude-low;
if (offset < totalSmallBucketSize)
{
low += offset - offset % smallBucketSize;
high = low + smallBucketSize - 1;
}
else
{
offset -= totalSmallBucketSize;
low += totalSmallBucketSize + offset - offset % (smallBucketSize+1);
high = low + smallBucketSize;
}
}
TR_ASSERT(low <= magnitude && magnitude <= high, "Range (%d..%d) must contain %d\n", low, high, magnitude);
if (value < 0)
{
low = -low;
high = -high;
}
}
if (low == high)
sprintf(bucketFormat, "%s=%d", format, low);
else
sprintf(bucketFormat, "%s=%d..%d", format, low, high);
va_list args;
va_start(args, format);
const char *result = comp->getPersistentInfo()->getStaticCounters()->counterName(comp, bucketFormat, args);
va_end(args);
return result;
}