Changes in directory llvm/include/llvm/ADT:
APInt.h updated: 1.50 -> 1.51
---
Log message:
Implement the getHighBitsSet and getLowBitsSet functions.
---
Diffs of the changes: (+16 -2)
APInt.h | 18 ++++++++++++++++--
1 files changed, 16 insertions(+), 2 deletions(-)
Index: llvm/include/llvm/ADT/APInt.h
diff -u llvm/include/llvm/ADT/APInt.h:1.50 llvm/include/llvm/ADT/APInt.h:1.51
--- llvm/include/llvm/ADT/APInt.h:1.50 Sat Mar 24 17:50:43 2007
+++ llvm/include/llvm/ADT/APInt.h Sat Mar 24 18:05:35 2007
@@ -346,13 +346,27 @@
/// @param numBits the bitwidth of the result
/// @param hiBitsSet the number of high-order bits set in the result.
/// @brief Get a value with high bits set
- static APInt getHighBitsSet(uint32_t numBits, uint32_t hiBitsSet);
+ static APInt getHighBitsSet(uint32_t numBits, uint32_t hiBitsSet) {
+ assert(hiBitsSet <= numBits && "Too many bits to set!");
+ uint32_t mvBits = numBits - hiBitsSet;
+ // For small values, return quickly
+ if (numBits <= APINT_BITS_PER_WORD)
+ return APInt(numBits, ((1ULL << hiBitsSet) - 1) << mvBits);
+ APInt Result(numBits, 1);
+ return (APInt(numBits, 1).shl(hiBitsSet) - APInt(numBits, 1)).shl(mvBits);
+ }
/// Constructs an APInt value that has the bottom loBitsSet bits set.
/// @param numBits the bitwidth of the result
/// @param loBitsSet the number of low-order bits set in the result.
/// @brief Get a value with low bits set
- static APInt getLowBitsSet(uint32_t numBits, uint32_t loBitsSet);
+ static APInt getLowBitsSet(uint32_t numBits, uint32_t loBitsSet) {
+ assert(loBitsSet <= numBits && "Too many bits to set!");
+ // For small values, return quickly
+ if (numBits <= APINT_BITS_PER_WORD)
+ return APInt(numBits, (1ULL << loBitsSet) - 1ULL);
+ return APInt(numBits, 1).shl(loBitsSet) - APInt(numBits, 1);
+ }
/// The hash value is computed as the sum of the words and the bit width.
/// @returns A hash value computed from the sum of the APInt words.
_______________________________________________
llvm-commits mailing list
llvm-commits@cs.uiuc.edu
http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
