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Add methods for bit width modification: sextOrTrunc, zextOrTrunc.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34789 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2007-03-01 17:15:32 +00:00
parent 9dd9abd87f
commit 68e2300ad9
2 changed files with 26 additions and 0 deletions
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10
include/llvm/ADT/APInt.h
View File

@ -423,6 +423,16 @@ public:
/// @brief Zero extend to a new width.
APInt &zext(uint32_t width);
/// Make this APInt have the bit width given by \p width. The value is sign
/// extended, truncated, or left alone to make it that width.
/// @brief Sign extend or truncate to width
APInt &sextOrTrunc(uint32_t width);
/// Make this APInt have the bit width given by \p width. The value is zero
/// extended, truncated, or left alone to make it that width.
/// @brief Zero extend or truncate to width
APInt &zextOrTrunc(uint32_t width);
/// @brief Set every bit to 1.
APInt& set();

16
lib/Support/APInt.cpp
View File

@ -985,6 +985,22 @@ APInt &APInt::zext(uint32_t width) {
return *this;
}
APInt &APInt::zextOrTrunc(uint32_t width) {
if (BitWidth < width)
return zext(width);
if (BitWidth > width)
return trunc(width);
return *this;
}
APInt &APInt::sextOrTrunc(uint32_t width) {
if (BitWidth < width)
return sext(width);
if (BitWidth > width)
return trunc(width);
return *this;
}
/// Arithmetic right-shift this APInt by shiftAmt.
/// @brief Arithmetic right-shift function.
APInt APInt::ashr(uint32_t shiftAmt) const {