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getRawValue zero extens for unsigned values, use getsextvalue so that we

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know that small negative values fit into the immediate field of addressing
modes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24608 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-12-05 18:23:57 +00:00
parent b457a93123
commit e08dc62b1a
1 changed files with 3 additions and 3 deletions
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6
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -560,9 +560,9 @@ static bool isTargetConstant(const SCEVHandle &V) {
// FIXME: Look at the target to decide if &GV is a legal constant immediate.
if (SCEVConstant *SC = dyn_cast<SCEVConstant>(V)) {
// PPC allows a sign-extended 16-bit immediate field.
if ((int64_t)SC->getValue()->getRawValue() > -(1 << 16) &&
(int64_t)SC->getValue()->getRawValue() < (1 << 16)-1)
return true;
int64_t V = SC->getValue()->getSExtValue();
if (V > -(1 << 16) && V < (1 << 16)-1)
return true;
return false;
}