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[KnownBits] Add const to some methods. NFC

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Add "const" to the trunc, zext, sext and zextOrTrunc
methods to make it clear that they aren't updating
the object itself.

llvm-svn: 356797
This commit is contained in:
Bjorn Pettersson 2019-03-22 19:36:51 +00:00
parent c19776dc48
commit cb63d74225
1 changed files with 5 additions and 4 deletions
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9
include/llvm/Support/KnownBits.h
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@ -109,7 +109,7 @@ public:
/// Truncate the underlying known Zero and One bits. This is equivalent
/// to truncating the value we're tracking.
KnownBits trunc(unsigned BitWidth) {
KnownBits trunc(unsigned BitWidth) const {
return KnownBits(Zero.trunc(BitWidth), One.trunc(BitWidth));
}
@ -117,7 +117,7 @@ public:
/// By setting ExtendedBitsAreKnownZero=true this will be equivalent to
/// zero extending the value we're tracking.
/// With ExtendedBitsAreKnownZero=false the extended bits are set to unknown.
KnownBits zext(unsigned BitWidth, bool ExtendedBitsAreKnownZero) {
KnownBits zext(unsigned BitWidth, bool ExtendedBitsAreKnownZero) const {
unsigned OldBitWidth = getBitWidth();
APInt NewZero = Zero.zext(BitWidth);
if (ExtendedBitsAreKnownZero)
@ -127,7 +127,7 @@ public:
/// Sign extends the underlying known Zero and One bits. This is equivalent
/// to sign extending the value we're tracking.
KnownBits sext(unsigned BitWidth) {
KnownBits sext(unsigned BitWidth) const {
return KnownBits(Zero.sext(BitWidth), One.sext(BitWidth));
}
@ -135,7 +135,8 @@ public:
/// extending the extended bits can either be set as known zero (if
/// ExtendedBitsAreKnownZero=true) or as unknown (if
/// ExtendedBitsAreKnownZero=false).
KnownBits zextOrTrunc(unsigned BitWidth, bool ExtendedBitsAreKnownZero) {
KnownBits zextOrTrunc(unsigned BitWidth,
bool ExtendedBitsAreKnownZero) const {
if (BitWidth > getBitWidth())
return zext(BitWidth, ExtendedBitsAreKnownZero);
return KnownBits(Zero.zextOrTrunc(BitWidth), One.zextOrTrunc(BitWidth));