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Fall back to selection DAG isel for calls to builtin functions.

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Fast isel doesn't currently have support for translating builtin function
calls to target instructions.  For embedded environments where the library
functions are not available, this is a matter of correctness and not
just optimization.  Most of this patch is just arranging to make the
TargetLibraryInfo available in fast isel.  <rdar://problem/12008746>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161232 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2012-08-03 04:06:28 +00:00
parent d1e672e023
commit d49edb7ab0
11 changed files with 59 additions and 20 deletions
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19
lib/CodeGen/SelectionDAG/FastISel.cpp
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@@ -55,6 +55,7 @@
#include "llvm/Analysis/Loads.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetLibraryInfo.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/ErrorHandling.h"
@@ -789,6 +790,18 @@ FastISel::SelectInstruction(const Instruction *I) {
MachineBasicBlock::iterator SavedInsertPt = FuncInfo.InsertPt;
// As a special case, don't even try to handle calls to builtin library
// functions so that calls to builtin functions get translated to
// instructions when supported by the target.
if (const CallInst *Call = dyn_cast<CallInst>(I)) {
const Function *F = Call->getCalledFunction();
LibFunc::Func Func;
if (F && !F->hasLocalLinkage() && F->hasName() &&
LibInfo->getLibFunc(F->getName(), Func) &&
LibInfo->has(Func))
return false;
}
// First, try doing target-independent selection.
if (SelectOperator(I, I->getOpcode())) {
++NumFastIselSuccessIndependent;
@@ -1040,7 +1053,8 @@ FastISel::SelectOperator(const User *I, unsigned Opcode) {
}
}
FastISel::FastISel(FunctionLoweringInfo &funcInfo)
FastISel::FastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo)
: FuncInfo(funcInfo),
MRI(FuncInfo.MF->getRegInfo()),
MFI(*FuncInfo.MF->getFrameInfo()),
@@ -1049,7 +1063,8 @@ FastISel::FastISel(FunctionLoweringInfo &funcInfo)
TD(*TM.getTargetData()),
TII(*TM.getInstrInfo()),
TLI(*TM.getTargetLowering()),
TRI(*TM.getRegisterInfo()) {
TRI(*TM.getRegisterInfo()),
LibInfo(libInfo) {
}
FastISel::~FastISel() {}