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Allow i16 type indices to gep.

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llvm-svn: 69946
This commit is contained in:
Sanjiv Gupta 2009-04-24 02:37:54 +00:00
parent 9d13b714f5
commit f1177e1be7
3 changed files with 7 additions and 8 deletions
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5
docs/LangRef.html
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@ -3629,7 +3629,8 @@ the pointer before continuing calculation.</p>
<p>The type of each index argument depends on the type it is indexing into.
When indexing into a (packed) structure, only <tt>i32</tt> integer
<b>constants</b> are allowed. When indexing into an array, pointer or vector,
only integers of 32 or 64 bits are allowed (also non-constants). 32-bit values
only integers of 16, 32 or 64 bits are allowed (also non-constants).16-bit
values will be sign extended to 32-bits if required, and 32-bit values
will be sign extended to 64-bits if required.</p>
<p>For example, let's consider a C code fragment and how it gets
@ -3717,6 +3718,8 @@ FAQ</a>.</p>
%vptr = getelementptr {i32, &lt;2 x i8&gt;}* %svptr, i64 0, i32 1, i32 1
<i>; yields i8*:eptr</i>
%eptr = getelementptr [12 x i8]* %aptr, i64 0, i32 1
<i>; yields i16*:iptr</i>
%iptr = getelementptr [10 x i16]* @arr, i16 0, i16 0
</pre>
</div>

7
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -10695,12 +10695,7 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
gep_type_iterator GTI = gep_type_begin(GEP);
for (User::op_iterator i = GEP.op_begin() + 1, e = GEP.op_end();
i != e; ++i, ++GTI) {
// Before trying to eliminate/introduce cast/ext/trunc to make
// indices as pointer types, make sure that the pointer size
// makes a valid sequential index.
const SequentialType *ST = dyn_cast<SequentialType>(*GTI);
Value *PtrTypeVal = Constant::getNullValue(TD->getIntPtrType());
if (ST && ST->indexValid(PtrTypeVal)) {
if (isa<SequentialType>(*GTI)) {
if (CastInst *CI = dyn_cast<CastInst>(*i)) {
if (CI->getOpcode() == Instruction::ZExt ||
CI->getOpcode() == Instruction::SExt) {

3
lib/VMCore/Type.cpp
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@ -1411,7 +1411,8 @@ void PointerType::typeBecameConcrete(const DerivedType *AbsTy) {
bool SequentialType::indexValid(const Value *V) const {
if (const IntegerType *IT = dyn_cast<IntegerType>(V->getType()))
return IT->getBitWidth() == 32 || IT->getBitWidth() == 64;
return IT->getBitWidth() == 16 || IT->getBitWidth() == 32 ||
IT->getBitWidth() == 64;
return false;
}