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Add a new optimization pass: Stack Coloring, that merges disjoint static allocations (allocas). Allocas are known to be

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disjoint if they are marked by disjoint lifetime markers (@llvm.lifetime.XXX intrinsics).



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163299 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem
2012-09-06 09:17:37 +00:00
parent 6c822eea47
commit c05d30601c
22 changed files with 1058 additions and 17 deletions
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21
include/llvm/ADT/BitVector.h
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@@ -311,7 +311,7 @@ public:
return !(*this == RHS);
}
// Intersection, union, disjoint union.
/// Intersection, union, disjoint union.
BitVector &operator&=(const BitVector &RHS) {
unsigned ThisWords = NumBitWords(size());
unsigned RHSWords = NumBitWords(RHS.size());
@@ -328,7 +328,7 @@ public:
return *this;
}
// reset - Reset bits that are set in RHS. Same as *this &= ~RHS.
/// reset - Reset bits that are set in RHS. Same as *this &= ~RHS.
BitVector &reset(const BitVector &RHS) {
unsigned ThisWords = NumBitWords(size());
unsigned RHSWords = NumBitWords(RHS.size());
@@ -338,6 +338,23 @@ public:
return *this;
}
/// test - Check if (This - RHS) is zero.
/// This is the same as reset(RHS) and any().
bool test(const BitVector &RHS) const {
unsigned ThisWords = NumBitWords(size());
unsigned RHSWords = NumBitWords(RHS.size());
unsigned i;
for (i = 0; i != std::min(ThisWords, RHSWords); ++i)
if ((Bits[i] & ~RHS.Bits[i]) != 0)
return true;
for (; i != ThisWords ; ++i)
if (Bits[i] != 0)
return true;
return false;
}
BitVector &operator|=(const BitVector &RHS) {
if (size() < RHS.size())
resize(RHS.size());