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Make ARM an X86 memcpy expansion more similar to each other.

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Now both subtarget define getMaxInlineSizeThreshold and the expansion uses it.

This should not change generated code.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43552 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2007-10-31 11:52:06 +00:00
parent 7169a2f9e8
commit fc05f402ea
5 changed files with 11 additions and 11 deletions
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3
lib/Target/ARM/ARMISelLowering.cpp
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@ -1315,7 +1315,8 @@ SDOperand ARMTargetLowering::LowerMEMCPY(SDOperand Op, SelectionDAG &DAG,
// this once Thumb ldmia / stmia support is added.
unsigned Size = I->getValue();
if (AlwaysInline ||
(!ST->isThumb() && Size < 64 && (Align & 3) == 0))
(!ST->isThumb() && Size <= Subtarget->getMaxInlineSizeThreshold() &&
(Align & 3) == 0))
return LowerMEMCPYInline(ChainOp, DestOp, SourceOp, Size, Align, DAG);
return LowerMEMCPYCall(ChainOp, DestOp, SourceOp, CountOp, DAG);
}

1
lib/Target/ARM/ARMSubtarget.h
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@ -62,6 +62,7 @@ protected:
///
ARMSubtarget(const Module &M, const std::string &FS, bool thumb);
unsigned getMaxInlineSizeThreshold() const { return 64; }
/// ParseSubtargetFeatures - Parses features string setting specified
/// subtarget options. Definition of function is auto generated by tblgen.
void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);

4
lib/Target/X86/X86ISelLowering.cpp
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@ -4332,7 +4332,7 @@ SDOperand X86TargetLowering::LowerMEMSET(SDOperand Op, SelectionDAG &DAG) {
// 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 ||
(I && I->getValue() > Subtarget->getMinRepStrSizeThreshold())) {
(I && I->getValue() > Subtarget->getMaxInlineSizeThreshold())) {
MVT::ValueType IntPtr = getPointerTy();
const Type *IntPtrTy = getTargetData()->getIntPtrType();
TargetLowering::ArgListTy Args;
@ -4510,7 +4510,7 @@ SDOperand X86TargetLowering::LowerMEMCPY(SDOperand Op, SelectionDAG &DAG) {
return LowerMEMCPYCall(ChainOp, DestOp, SourceOp, CountOp, DAG);
// If size is more than the threshold, call memcpy.
if (Size > Subtarget->getMinRepStrSizeThreshold())
if (Size > Subtarget->getMaxInlineSizeThreshold())
return LowerMEMCPYCall(ChainOp, DestOp, SourceOp, CountOp, DAG);
return LowerMEMCPYInline(ChainOp, DestOp, SourceOp, Size, Align, DAG);

2
lib/Target/X86/X86Subtarget.cpp
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@ -223,7 +223,7 @@ X86Subtarget::X86Subtarget(const Module &M, const std::string &FS, bool is64Bit)
, HasX86_64(false)
, stackAlignment(8)
// FIXME: this is a known good value for Yonah. How about others?
, MinRepStrSizeThreshold(128)
, MaxInlineSizeThreshold(128)
, Is64Bit(is64Bit)
, HasLow4GUserAddress(true)
, TargetType(isELF) { // Default to ELF unless otherwise specified.

12
lib/Target/X86/X86Subtarget.h
View File

@ -69,9 +69,9 @@ protected:
/// entry to the function and which must be maintained by every function.
unsigned stackAlignment;
/// Min. memset / memcpy size that is turned into rep/movs, rep/stos ops.
/// Max. memset / memcpy size that is turned into rep/movs, rep/stos ops.
///
unsigned MinRepStrSizeThreshold;
unsigned MaxInlineSizeThreshold;
private:
/// Is64Bit - True if the processor supports 64-bit instructions and module
@ -97,11 +97,9 @@ public:
/// function for this subtarget.
unsigned getStackAlignment() const { return stackAlignment; }
/// getMinRepStrSizeThreshold - Returns the minimum memset / memcpy size
/// required to turn the operation into a X86 rep/movs or rep/stos
/// instruction. This is only used if the src / dst alignment is not DWORD
/// aligned.
unsigned getMinRepStrSizeThreshold() const { return MinRepStrSizeThreshold; }
/// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
/// that still makes it profitable to inline the call.
unsigned getMaxInlineSizeThreshold() const { return MaxInlineSizeThreshold; }
/// ParseSubtargetFeatures - Parses features string setting specified
/// subtarget options. Definition of function is auto generated by tblgen.