RPCS3/llvm-mirror
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm-mirror.git synced 2025-01-31 20:51:52 +01:00
Code Issues Projects Releases Wiki Activity

Allow these transforms for types like i256 while

Browse Source 
still excluding types like i1 (not byte sized)
and i120 (loading an i120 requires loading an i64,
an i32, an i16 and an i8, which is expensive). 

llvm-svn: 52310
This commit is contained in:
Duncan Sands 2008-06-16 08:14:38 +00:00
parent 93d91a771c
commit 78bdcc813e
2 changed files with 12 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/llvm/CodeGen/ValueTypes.h
View File

@ -266,6 +266,12 @@ namespace llvm {
return (getSizeInBits() & 7) == 0;
}
/// isRound - Return true if the size is a power-of-two number of bytes.
inline bool isRound() const {
unsigned BitSize = getSizeInBits();
return BitSize >= 8 && !(BitSize & (BitSize - 1));
}
/// bitsGT - Return true if this has more bits than VT.
inline bool bitsGT(MVT VT) const {
return getSizeInBits() > VT.getSizeInBits();

14
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
View File

@ -1787,10 +1787,9 @@ SDOperand DAGCombiner::visitAND(SDNode *N) {
EVT = MVT::getIntegerVT(ActiveBits);
MVT LoadedVT = LN0->getMemoryVT();
// Do not generate loads of extended integer types since these can be
// expensive (and would be wrong if the type is not byte sized).
if (EVT != MVT::Other && LoadedVT.bitsGT(EVT) && EVT.isSimple() &&
EVT.isByteSized() && // Exclude MVT::i1, which is simple.
// Do not generate loads of non-round integer types since these can
// be expensive (and would be wrong if the type is not byte sized).
if (EVT != MVT::Other && LoadedVT.bitsGT(EVT) && EVT.isRound() &&
(!AfterLegalize || TLI.isLoadXLegal(ISD::ZEXTLOAD, EVT))) {
MVT PtrType = N0.getOperand(1).getValueType();
// For big endian targets, we need to add an offset to the pointer to
@ -3187,10 +3186,9 @@ SDOperand DAGCombiner::ReduceLoadWidth(SDNode *N) {
}
}
// Do not generate loads of extended integer types since these can be
// expensive (and would be wrong if the type is not byte sized).
if (ISD::isNON_EXTLoad(N0.Val) && N0.hasOneUse() && VT.isSimple() &&
VT.isByteSized() && // Exclude MVT::i1, which is simple.
// Do not generate loads of non-round integer types since these can
// be expensive (and would be wrong if the type is not byte sized).
if (ISD::isNON_EXTLoad(N0.Val) && N0.hasOneUse() && VT.isRound() &&
// Do not change the width of a volatile load.
!cast<LoadSDNode>(N0)->isVolatile()) {
assert(N0.getValueType().getSizeInBits() > EVTBits &&