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[NFC] Wisely nest dyn_cast in FunctionLoweringInfo 

Take advantage of the inheritance tree to avoid a few comparison.
This commit is contained in:
serge-sans-paille 2021-03-16 10:11:57 +01:00
parent 3c03635d53
commit 6e040a19db
1 changed files with 15 additions and 18 deletions
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33
llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
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@ -192,10 +192,8 @@ void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf,
MF->getFrameInfo().CreateVariableSizedObject(
Alignment <= StackAlign ? Align(1) : Alignment, AI);
}
}
// Look for inline asm that clobbers the SP register.
if (auto *Call = dyn_cast<CallBase>(&I)) {
} else if (auto *Call = dyn_cast<CallBase>(&I)) {
// Look for inline asm that clobbers the SP register.
if (Call->isInlineAsm()) {
Register SP = TLI->getStackPointerRegisterToSaveRestore();
const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo();
@ -214,21 +212,20 @@ void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf,
}
}
}
}
// Look for calls to the @llvm.va_start intrinsic. We can omit some
// prologue boilerplate for variadic functions that don't examine their
// arguments.
if (const auto *II = dyn_cast<IntrinsicInst>(&I)) {
if (II->getIntrinsicID() == Intrinsic::vastart)
MF->getFrameInfo().setHasVAStart(true);
}
// Look for calls to the @llvm.va_start intrinsic. We can omit some
// prologue boilerplate for variadic functions that don't examine their
// arguments.
if (const auto *II = dyn_cast<IntrinsicInst>(&I)) {
if (II->getIntrinsicID() == Intrinsic::vastart)
MF->getFrameInfo().setHasVAStart(true);
}
// If we have a musttail call in a variadic function, we need to ensure we
// forward implicit register parameters.
if (const auto *CI = dyn_cast<CallInst>(&I)) {
if (CI->isMustTailCall() && Fn->isVarArg())
MF->getFrameInfo().setHasMustTailInVarArgFunc(true);
// If we have a musttail call in a variadic function, we need to ensure
// we forward implicit register parameters.
if (const auto *CI = dyn_cast<CallInst>(&I)) {
if (CI->isMustTailCall() && Fn->isVarArg())
MF->getFrameInfo().setHasMustTailInVarArgFunc(true);
}
}
// Mark values used outside their block as exported, by allocating