diff options
Diffstat (limited to 'lib/Target/PowerPC/PPC32ISelSimple.cpp')
| -rw-r--r-- | lib/Target/PowerPC/PPC32ISelSimple.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/Target/PowerPC/PPC32ISelSimple.cpp b/lib/Target/PowerPC/PPC32ISelSimple.cpp index 1dd946a421..0e8b7b04c5 100644 --- a/lib/Target/PowerPC/PPC32ISelSimple.cpp +++ b/lib/Target/PowerPC/PPC32ISelSimple.cpp @@ -502,6 +502,10 @@ unsigned PPC32ISel::getReg(Value *V, MachineBasicBlock *MBB, unsigned Reg = makeAnotherReg(V->getType()); copyConstantToRegister(MBB, IPt, C, Reg); return Reg; + } else if (CastInst *CI = dyn_cast<CastInst>(V)) { + // Do not emit noop casts at all, unless it's a double -> float cast. + if (getClassB(CI->getType()) == getClassB(CI->getOperand(0)->getType())) + return getReg(CI->getOperand(0), MBB, IPt); } else if (AllocaInst *AI = dyn_castFixedAlloca(V)) { unsigned Reg = makeAnotherReg(V->getType()); unsigned FI = getFixedSizedAllocaFI(AI); @@ -3129,6 +3133,10 @@ void PPC32ISel::visitCastInst(CastInst &CI) { unsigned SrcClass = getClassB(Op->getType()); unsigned DestClass = getClassB(CI.getType()); + // Noop casts are not emitted: getReg will return the source operand as the + // register to use for any uses of the noop cast. + if (DestClass == SrcClass) return; + // If this is a cast from a 32-bit integer to a Long type, and the only uses // of the cast are GEP instructions, then the cast does not need to be // generated explicitly, it will be folded into the GEP. |