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Implemented constant propogation of cast instructions

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1064 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2001-10-31 05:07:57 +00:00
parent 11c862cf46
commit 37aabf28b3
6 changed files with 49 additions and 4 deletions
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lib/Transforms/Scalar/ConstantProp.cpp
+27
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@@ -53,6 +53,29 @@ ConstantFoldUnaryInst(Method *M, Method::inst_iterator &DI,
return true;
}
inline static bool
ConstantFoldCast(Method *M, Method::inst_iterator &DI,
CastInst *CI, ConstPoolVal *D) {
ConstPoolVal *ReplaceWith =
opt::ConstantFoldCastInstruction(D, CI->getType());
if (!ReplaceWith) return false; // Nothing new to change...
// Replaces all of the uses of a variable with uses of the constant.
CI->replaceAllUsesWith(ReplaceWith);
// Remove the cast from the list of definitions...
CI->getParent()->getInstList().remove(DI.getInstructionIterator());
// The new constant inherits the old name of the cast...
if (CI->hasName())
ReplaceWith->setName(CI->getName(), M->getSymbolTableSure());
// Delete the cast now...
delete CI;
return true;
}
inline static bool
ConstantFoldBinaryInst(Method *M, Method::inst_iterator &DI,
BinaryOperator *Op,
@@ -142,6 +165,10 @@ ConstantFoldInstruction(Method *M, Method::inst_iterator &II) {
if (D1 && D2)
return ConstantFoldBinaryInst(M, II, cast<BinaryOperator>(Inst), D1, D2);
} else if (CastInst *CI = dyn_cast<CastInst>(Inst)) {
ConstPoolVal *D = dyn_cast<ConstPoolVal>(CI->getOperand(0));
if (D) return ConstantFoldCast(M, II, CI, D);
} else if (UnaryOperator *UInst = dyn_cast<UnaryOperator>(Inst)) {
ConstPoolVal *D = dyn_cast<ConstPoolVal>(UInst->getOperand(0));
if (D) return ConstantFoldUnaryInst(M, II, UInst, D);