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Add an int64_t variant of abs, for host environments

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without one.  Use it where we were using abs on
int64_t objects.
(I strongly suspect the casts to unsigned in the
fragments in LoopStrengthReduce are not doing whatever
the original intent was, but the obvious change to
uint64_t doesn't work.  Maybe later.)



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71612 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen
2009-05-13 00:24:22 +00:00
parent 0e0da734bb
commit 7b9486ad43
3 changed files with 12 additions and 5 deletions
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6
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@@ -1013,7 +1013,7 @@ SCEVHandle LoopStrengthReduce::CheckForIVReuse(bool HasBaseReg,
continue;
int64_t SSInt = cast<SCEVConstant>(SI->first)->getValue()->getSExtValue();
if (SI->first != Stride &&
(unsigned(abs(SInt)) < SSInt || (SInt % SSInt) != 0))
(unsigned(abs64(SInt)) < SSInt || (SInt % SSInt) != 0))
continue;
int64_t Scale = SInt / SSInt;
// Check that this stride is valid for all the types used for loads and
@@ -1900,7 +1900,7 @@ ICmpInst *LoopStrengthReduce::ChangeCompareStride(Loop *L, ICmpInst *Cond,
continue;
int64_t SSInt = cast<SCEVConstant>(SI->first)->getValue()->getSExtValue();
if (SSInt == CmpSSInt ||
abs(SSInt) < abs(CmpSSInt) ||
abs64(SSInt) < abs64(CmpSSInt) ||
(SSInt % CmpSSInt) != 0)
continue;
@@ -2336,7 +2336,7 @@ void LoopStrengthReduce::OptimizeLoopTermCond(Loop *L) {
cast<SCEVConstant>(SI->first)->getValue()->getSExtValue();
if (SSInt == SInt)
return; // This can definitely be reused.
if (unsigned(abs(SSInt)) < SInt || (SSInt % SInt) != 0)
if (unsigned(abs64(SSInt)) < SInt || (SSInt % SInt) != 0)
continue;
int64_t Scale = SSInt / SInt;
bool AllUsesAreAddresses = true;