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Factor out a SelectTrunc function. No functionality change intended.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@143523 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier 2011-11-02 00:18:48 +00:00
parent 3129da8d1a
commit 0d7b231c9b
1 changed files with 28 additions and 17 deletions
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45
lib/Target/ARM/ARMFastISel.cpp
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@ -167,7 +167,8 @@ class ARMFastISel : public FastISel {
bool SelectCall(const Instruction *I);
bool SelectSelect(const Instruction *I);
bool SelectRet(const Instruction *I);
bool SelectIntCast(const Instruction *I);
bool SelectTrunc(const Instruction *I);
bool SelectIntExt(const Instruction *I);
// Utility routines.
private:
@ -1963,7 +1964,30 @@ bool ARMFastISel::SelectCall(const Instruction *I) {
}
bool ARMFastISel::SelectIntCast(const Instruction *I) {
bool ARMFastISel::SelectTrunc(const Instruction *I) {
// The high bits for a type smaller than the register size are assumed to be
// undefined.
Value *Op = I->getOperand(0);
EVT SrcVT, DestVT;
SrcVT = TLI.getValueType(Op->getType(), true);
DestVT = TLI.getValueType(I->getType(), true);
if (SrcVT != MVT::i32 && SrcVT != MVT::i16 && SrcVT != MVT::i8)
return false;
if (DestVT != MVT::i16 && DestVT != MVT::i8 && DestVT != MVT::i1)
return false;
unsigned SrcReg = getRegForValue(Op);
if (!SrcReg) return false;
// Because the high bits are undefined, a truncate doesn't generate
// any code.
UpdateValueMap(I, SrcReg);
return true;
}
bool ARMFastISel::SelectIntExt(const Instruction *I) {
// On ARM, in general, integer casts don't involve legal types; this code
// handles promotable integers. The high bits for a type smaller than
// the register size are assumed to be undefined.
@ -1975,20 +1999,6 @@ bool ARMFastISel::SelectIntCast(const Instruction *I) {
SrcVT = TLI.getValueType(SrcTy, true);
DestVT = TLI.getValueType(DestTy, true);
if (isa<TruncInst>(I)) {
if (SrcVT != MVT::i32 && SrcVT != MVT::i16 && SrcVT != MVT::i8)
return false;
if (DestVT != MVT::i16 && DestVT != MVT::i8 && DestVT != MVT::i1)
return false;
unsigned SrcReg = getRegForValue(Op);
if (!SrcReg) return false;
// Because the high bits are undefined, a truncate doesn't generate
// any code.
UpdateValueMap(I, SrcReg);
return true;
}
if (DestVT != MVT::i32 && DestVT != MVT::i16 && DestVT != MVT::i8)
return false;
@ -2078,9 +2088,10 @@ bool ARMFastISel::TargetSelectInstruction(const Instruction *I) {
case Instruction::Ret:
return SelectRet(I);
case Instruction::Trunc:
return SelectTrunc(I);
case Instruction::ZExt:
case Instruction::SExt:
return SelectIntCast(I);
return SelectIntExt(I);
default: break;
}
return false;