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[SystemZ] Use isShiftedMask_64 instead of isStringOfOnes (NFC)

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isStringOfOnes does the same thing as isShiftedMask_64, provided that
the parameter is nonzero, which is the case for both calls in this
patch.
This commit is contained in:
Kazu Hirata 2023-01-23 22:48:42 -08:00
parent 5238df7ed5
commit be2ecee046
1 changed files with 2 additions and 16 deletions
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18
llvm/lib/Target/SystemZ/SystemZInstrInfo.cpp
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@ -1711,20 +1711,6 @@ unsigned SystemZInstrInfo::getLoadAndTest(unsigned Opcode) const {
}
}
// Return true if Mask matches the regexp 0*1+0*, given that zero masks
// have already been filtered out. Store the first set bit in LSB and
// the number of set bits in Length if so.
static bool isStringOfOnes(uint64_t Mask, unsigned &LSB, unsigned &Length) {
unsigned First = findFirstSet(Mask);
uint64_t Top = (Mask >> First) + 1;
if ((Top & -Top) == Top) {
LSB = First;
Length = findFirstSet(Top);
return true;
}
return false;
}
bool SystemZInstrInfo::isRxSBGMask(uint64_t Mask, unsigned BitSize,
unsigned &Start, unsigned &End) const {
// Reject trivial all-zero masks.
@ -1735,7 +1721,7 @@ bool SystemZInstrInfo::isRxSBGMask(uint64_t Mask, unsigned BitSize,
// Handle the 1+0+ or 0+1+0* cases. Start then specifies the index of
// the msb and End specifies the index of the lsb.
unsigned LSB, Length;
if (isStringOfOnes(Mask, LSB, Length)) {
if (isShiftedMask_64(Mask, LSB, Length)) {
Start = 63 - (LSB + Length - 1);
End = 63 - LSB;
return true;
@ -1743,7 +1729,7 @@ bool SystemZInstrInfo::isRxSBGMask(uint64_t Mask, unsigned BitSize,
// Handle the wrap-around 1+0+1+ cases. Start then specifies the msb
// of the low 1s and End specifies the lsb of the high 1s.
if (isStringOfOnes(Mask ^ allOnes(BitSize), LSB, Length)) {
if (isShiftedMask_64(Mask ^ allOnes(BitSize), LSB, Length)) {
assert(LSB > 0 && "Bottom bit must be set");
assert(LSB + Length < BitSize && "Top bit must be set");
Start = 63 - (LSB - 1);