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Add the new `-no-builtin' flag. This flag is meant to mimic the GCC

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`-fno-builtin' flag. Currently, it's used to replace "memset" with "_bzero"
instead of "__bzero" on Darwin10+. This arguably violates the meaning of this
flag, but is currently sufficient. The meaning of this flag should become more
specific over time.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56885 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2008-09-30 21:22:07 +00:00
parent 5ec9efd61b
commit 6f287b22d2
6 changed files with 39 additions and 30 deletions
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3
include/llvm/Target/TargetLowering.h
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@ -1049,7 +1049,8 @@ public:
SDValue Chain,
SDValue Op1, SDValue Op2,
SDValue Op3, unsigned Align,
const Value *DstSV, uint64_t DstOff) {
const Value *DstSV, uint64_t DstOff,
bool NoBuiltin = false) {
return SDValue();
}

8
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -29,6 +29,7 @@
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/ADT/SetVector.h"
@ -40,6 +41,11 @@
#include <cmath>
using namespace llvm;
static cl::opt<bool>
NoBuiltin("no-builtin",
cl::desc("Don't recognize built-in functions that do not begin "
"with `__builtin_' as prefix"));
/// makeVTList - Return an instance of the SDVTList struct initialized with the
/// specified members.
static SDVTList makeVTList(const MVT *VTs, unsigned NumVTs) {
@ -3189,7 +3195,7 @@ SDValue SelectionDAG::getMemset(SDValue Chain, SDValue Dst,
// code. If the target chooses to do this, this is the next best.
SDValue Result =
TLI.EmitTargetCodeForMemset(*this, Chain, Dst, Src, Size, Align,
DstSV, DstSVOff);
DstSV, DstSVOff, NoBuiltin);
if (Result.getNode())
return Result;

21
lib/Target/X86/X86ISelLowering.cpp
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@ -5128,15 +5128,17 @@ X86TargetLowering::LowerDYNAMIC_STACKALLOC(SDValue Op,
SDValue
X86TargetLowering::EmitTargetCodeForMemset(SelectionDAG &DAG,
SDValue Chain,
SDValue Dst, SDValue Src,
SDValue Size, unsigned Align,
const Value *DstSV, uint64_t DstSVOff) {
SDValue Chain,
SDValue Dst, SDValue Src,
SDValue Size, unsigned Align,
const Value *DstSV,
uint64_t DstSVOff,
bool NoBuiltin) {
ConstantSDNode *ConstantSize = dyn_cast<ConstantSDNode>(Size);
/// If not DWORD aligned or size is more than the threshold, call the library.
/// The libc version is likely to be faster for these cases. It can use the
/// address value and run time information about the CPU.
// If not DWORD aligned or size is more than the threshold, call the library.
// The libc version is likely to be faster for these cases. It can use the
// address value and run time information about the CPU.
if ((Align & 3) != 0 ||
!ConstantSize ||
ConstantSize->getZExtValue() >
@ -5145,8 +5147,9 @@ X86TargetLowering::EmitTargetCodeForMemset(SelectionDAG &DAG,
// Check to see if there is a specialized entry-point for memory zeroing.
ConstantSDNode *V = dyn_cast<ConstantSDNode>(Src);
if (const char *bzeroEntry =
V && V->isNullValue() ? Subtarget->getBZeroEntry() : 0) {
if (const char *bzeroEntry = V &&
V->isNullValue() ? Subtarget->getBZeroEntry(NoBuiltin) : 0) {
MVT IntPtr = getPointerTy();
const Type *IntPtrTy = TD->getIntPtrType();
TargetLowering::ArgListTy Args;

21
lib/Target/X86/X86ISelLowering.h
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@ -575,17 +575,18 @@ namespace llvm {
SDNode *ExpandATOMIC_CMP_SWAP(SDNode *N, SelectionDAG &DAG);
SDValue EmitTargetCodeForMemset(SelectionDAG &DAG,
SDValue Chain,
SDValue Dst, SDValue Src,
SDValue Size, unsigned Align,
const Value *DstSV, uint64_t DstSVOff);
SDValue Chain,
SDValue Dst, SDValue Src,
SDValue Size, unsigned Align,
const Value *DstSV, uint64_t DstSVOff,
bool NoBuiltin);
SDValue EmitTargetCodeForMemcpy(SelectionDAG &DAG,
SDValue Chain,
SDValue Dst, SDValue Src,
SDValue Size, unsigned Align,
bool AlwaysInline,
const Value *DstSV, uint64_t DstSVOff,
const Value *SrcSV, uint64_t SrcSVOff);
SDValue Chain,
SDValue Dst, SDValue Src,
SDValue Size, unsigned Align,
bool AlwaysInline,
const Value *DstSV, uint64_t DstSVOff,
const Value *SrcSV, uint64_t SrcSVOff);
/// Utility function to emit atomic bitwise operations (and, or, xor).
// It takes the bitwise instruction to expand, the associated machine basic

14
lib/Target/X86/X86Subtarget.cpp
View File

@ -59,16 +59,14 @@ bool X86Subtarget::GVRequiresExtraLoad(const GlobalValue* GV,
return false;
}
/// This function returns the name of a function which has an interface
/// like the non-standard bzero function, if such a function exists on
/// the current subtarget and it is considered prefereable over
/// memset with zero passed as the second argument. Otherwise it
/// returns null.
const char *X86Subtarget::getBZeroEntry() const {
/// getBZeroEntry - This function returns the name of a function which has an
/// interface like the non-standard bzero function, if such a function exists on
/// the current subtarget and it is considered prefereable over memset with zero
/// passed as the second argument. Otherwise it returns null.
const char *X86Subtarget::getBZeroEntry(bool NoBuiltin) const {
// Darwin 10 has a __bzero entry point for this purpose.
if (getDarwinVers() >= 10)
return "__bzero";
return NoBuiltin ? "_bzero" : "__bzero";
return 0;
}

2
lib/Target/X86/X86Subtarget.h
View File

@ -184,7 +184,7 @@ public:
/// the current subtarget and it is considered prefereable over
/// memset with zero passed as the second argument. Otherwise it
/// returns null.
const char *getBZeroEntry() const;
const char *getBZeroEntry(bool NoBuiltin) const;
};
namespace X86 {