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We can do cast-add elimination even on casts that reinterpret

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llvm-svn: 1427
This commit is contained in:
Chris Lattner 2001-12-06 18:06:13 +00:00
parent e23b6591f9
commit e3b57cfe8f
1 changed files with 11 additions and 13 deletions
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24
lib/Transforms/LevelRaise.cpp
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@ -51,7 +51,6 @@ static inline bool isReinterpretingCast(const CastInst *CI) {
#if 0 // Unneccesary code, handled by convert exprs
// Peephole optimize the following instructions:
// %t1 = cast ? to x *
// %t2 = add x * %SP, %t1 ;; Constant must be 2nd operand
@ -117,8 +116,7 @@ static bool HandleCastToPointer(BasicBlock::iterator BI,
OtherPtr = C;
}
GetElementPtrInst *GEP = new GetElementPtrInst(OtherPtr, Indices,
I->getName());
GetElementPtrInst *GEP = new GetElementPtrInst(OtherPtr, Indices);
PRINT_PEEPHOLE1("cast-add-to-gep:i", I);
@ -128,7 +126,6 @@ static bool HandleCastToPointer(BasicBlock::iterator BI,
}
return true;
}
#endif
// Peephole optimize the following instructions:
// %t1 = cast ulong <const int> to {<...>} *
@ -269,16 +266,17 @@ static bool PeepholeOptimize(BasicBlock *BB, BasicBlock::iterator &BI) {
#endif
return true;
}
#if 0
// Otherwise find out it this cast is a cast to a pointer type, which is
// then added to some other pointer, then loaded or stored through. If
// so, convert the add into a getelementptr instruction...
//
if (const PointerType *DestPTy = dyn_cast<PointerType>(DestTy)) {
if (HandleCastToPointer(BI, DestPTy))
return true;
}
// Otherwise find out it this cast is a cast to a pointer type, which is
// then added to some other pointer, then loaded or stored through. If
// so, convert the add into a getelementptr instruction...
//
if (const PointerType *DestPTy = dyn_cast<PointerType>(DestTy)) {
if (HandleCastToPointer(BI, DestPTy)) {
BI = BB->begin(); // Rescan basic block. BI might be invalidated.
return true;
}
#endif
}
// Check to see if we are casting from a structure pointer to a pointer to