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Now that SrcBits and DestBits always represent the primitive size, rather

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than either the primitive size or the element primitive size (in the case
of vectors), simplify the vector logic.  No functionality change.  There
is some distracting churn in the patch because I lined up comments better
while there - sorry about that.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131533 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands 2011-05-18 10:59:25 +00:00
parent bb1695e333
commit 7016ec1a45
1 changed files with 29 additions and 55 deletions
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84
lib/VMCore/Instructions.cpp
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@ -2269,55 +2269,43 @@ bool CastInst::isCastable(const Type *SrcTy, const Type *DestTy) {
unsigned DestBits = DestTy->getPrimitiveSizeInBits(); // 0 for ptr
// Run through the possibilities ...
if (DestTy->isIntegerTy()) { // Casting to integral
if (SrcTy->isIntegerTy()) { // Casting from integral
if (DestTy->isIntegerTy()) { // Casting to integral
if (SrcTy->isIntegerTy()) { // Casting from integral
return true;
} else if (SrcTy->isFloatingPointTy()) { // Casting from floating pt
} else if (SrcTy->isFloatingPointTy()) { // Casting from floating pt
return true;
} else if (const VectorType *PTy = dyn_cast<VectorType>(SrcTy)) {
// Casting from vector
return DestBits == PTy->getBitWidth();
} else if (SrcTy->isVectorTy()) { // Casting from vector
return DestBits == SrcBits;
} else { // Casting from something else
return SrcTy->isPointerTy();
}
} else if (DestTy->isFloatingPointTy()) { // Casting to floating pt
if (SrcTy->isIntegerTy()) { // Casting from integral
} else if (DestTy->isFloatingPointTy()) { // Casting to floating pt
if (SrcTy->isIntegerTy()) { // Casting from integral
return true;
} else if (SrcTy->isFloatingPointTy()) { // Casting from floating pt
} else if (SrcTy->isFloatingPointTy()) { // Casting from floating pt
return true;
} else if (const VectorType *PTy = dyn_cast<VectorType>(SrcTy)) {
// Casting from vector
return DestBits == PTy->getBitWidth();
} else if (SrcTy->isVectorTy()) { // Casting from vector
return DestBits == SrcBits;
} else { // Casting from something else
return false;
}
} else if (const VectorType *DestPTy = dyn_cast<VectorType>(DestTy)) {
// Casting to vector
if (const VectorType *SrcPTy = dyn_cast<VectorType>(SrcTy)) {
// Casting from vector
return DestPTy->getBitWidth() == SrcPTy->getBitWidth();
} else if (DestPTy->getBitWidth() == SrcBits) {
return true; // float/int -> vector
} else if (SrcTy->isX86_MMXTy()) {
return DestPTy->getBitWidth() == 64; // MMX to 64-bit vector
} else {
return false;
}
} else if (DestTy->isVectorTy()) { // Casting to vector
return DestBits == SrcBits;
} else if (DestTy->isPointerTy()) { // Casting to pointer
if (SrcTy->isPointerTy()) { // Casting from pointer
if (SrcTy->isPointerTy()) { // Casting from pointer
return true;
} else if (SrcTy->isIntegerTy()) { // Casting from integral
} else if (SrcTy->isIntegerTy()) { // Casting from integral
return true;
} else { // Casting from something else
} else { // Casting from something else
return false;
}
} else if (DestTy->isX86_MMXTy()) {
if (const VectorType *SrcPTy = dyn_cast<VectorType>(SrcTy)) {
return SrcPTy->getBitWidth() == 64; // 64-bit vector to MMX
if (SrcTy->isVectorTy()) {
return DestBits == SrcBits; // 64-bit vector to MMX
} else {
return false;
}
} else { // Casting to something else
} else { // Casting to something else
return false;
}
}
@ -2371,10 +2359,9 @@ CastInst::getCastOpcode(
return FPToSI; // FP -> sint
else
return FPToUI; // FP -> uint
} else if (const VectorType *PTy = dyn_cast<VectorType>(SrcTy)) {
assert(DestBits == PTy->getBitWidth() &&
"Casting vector to integer of different width");
PTy = NULL;
} else if (SrcTy->isVectorTy()) {
assert(DestBits == SrcBits &&
"Casting vector to integer of different width");
return BitCast; // Same size, no-op cast
} else {
assert(SrcTy->isPointerTy() &&
@ -2395,29 +2382,17 @@ CastInst::getCastOpcode(
} else {
return BitCast; // same size, no-op cast
}
} else if (const VectorType *PTy = dyn_cast<VectorType>(SrcTy)) {
assert(DestBits == PTy->getBitWidth() &&
} else if (SrcTy->isVectorTy()) {
assert(DestBits == SrcBits &&
"Casting vector to floating point of different width");
PTy = NULL;
return BitCast; // same size, no-op cast
} else {
llvm_unreachable("Casting pointer or non-first class to float");
}
} else if (const VectorType *DestPTy = dyn_cast<VectorType>(DestTy)) {
if (const VectorType *SrcPTy = dyn_cast<VectorType>(SrcTy)) {
assert(DestPTy->getBitWidth() == SrcPTy->getBitWidth() &&
"Casting vector to vector of different widths");
(void)SrcPTy;
return BitCast; // vector -> vector
} else if (DestPTy->getBitWidth() == SrcBits) {
return BitCast; // float/int -> vector
} else if (SrcTy->isX86_MMXTy()) {
assert(DestPTy->getBitWidth()==64 &&
"Casting X86_MMX to vector of wrong width");
return BitCast; // MMX to 64-bit vector
} else {
assert(!"Illegal cast to vector (wrong type or size)");
}
} else if (DestTy->isVectorTy()) {
assert(DestBits == SrcBits &&
"Illegal cast to vector (wrong type or size)");
return BitCast;
} else if (DestTy->isPointerTy()) {
if (SrcTy->isPointerTy()) {
return BitCast; // ptr -> ptr
@ -2427,9 +2402,8 @@ CastInst::getCastOpcode(
assert(!"Casting pointer to other than pointer or int");
}
} else if (DestTy->isX86_MMXTy()) {
if (isa<VectorType>(SrcTy)) {
assert(cast<VectorType>(SrcTy)->getBitWidth() == 64 &&
"Casting vector of wrong width to X86_MMX");
if (SrcTy->isVectorTy()) {
assert(DestBits == SrcBits && "Casting vector of wrong width to X86_MMX");
return BitCast; // 64-bit vector to MMX
} else {
assert(!"Illegal cast to X86_MMX");