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Implement the getRegForInlineAsmConstraint method for PPC. With recent

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sdisel changes, this eliminates a ton of copies around common inline asms.
For example:

int test2(int Y, int X) {
  asm("foo %0, %1" : "=r"(X): "r"(X));
  return X;
}

now compiles to:

_test2:
        foo r3, r4
        blr

instead of:

_test2:
        mr r2, r4
        foo r2, r2
        mr r3, r2
        blr

GCC produces:

_test2:
        foo r4, r4
        mr r3,r4
        blr

llvm-svn: 31367
This commit is contained in:
Chris Lattner 2006-11-02 01:44:04 +00:00
parent 35cd439221
commit 38c04a6bd6
2 changed files with 29 additions and 56 deletions
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75
lib/Target/PowerPC/PPCISelLowering.cpp
View File

@ -28,8 +28,8 @@
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
PPCTargetLowering::PPCTargetLowering(TargetMachine &TM)
: TargetLowering(TM) {
PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM)
: TargetLowering(TM), PPCSubTarget(*TM.getSubtargetImpl()) {
// Fold away setcc operations if possible.
setSetCCIsExpensive();
@ -2600,63 +2600,34 @@ PPCTargetLowering::getConstraintType(char ConstraintLetter) const {
return TargetLowering::getConstraintType(ConstraintLetter);
}
std::vector<unsigned> PPCTargetLowering::
getRegClassForInlineAsmConstraint(const std::string &Constraint,
MVT::ValueType VT) const {
std::pair<unsigned, const TargetRegisterClass*>
PPCTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
MVT::ValueType VT) const {
if (Constraint.size() == 1) {
switch (Constraint[0]) { // GCC RS6000 Constraint Letters
default: break; // Unknown constriant letter
case 'b':
return make_vector<unsigned>(/*no R0*/ PPC::R1 , PPC::R2 , PPC::R3 ,
PPC::R4 , PPC::R5 , PPC::R6 , PPC::R7 ,
PPC::R8 , PPC::R9 , PPC::R10, PPC::R11,
PPC::R12, PPC::R13, PPC::R14, PPC::R15,
PPC::R16, PPC::R17, PPC::R18, PPC::R19,
PPC::R20, PPC::R21, PPC::R22, PPC::R23,
PPC::R24, PPC::R25, PPC::R26, PPC::R27,
PPC::R28, PPC::R29, PPC::R30, PPC::R31,
0);
case 'r':
return make_vector<unsigned>(PPC::R0 , PPC::R1 , PPC::R2 , PPC::R3 ,
PPC::R4 , PPC::R5 , PPC::R6 , PPC::R7 ,
PPC::R8 , PPC::R9 , PPC::R10, PPC::R11,
PPC::R12, PPC::R13, PPC::R14, PPC::R15,
PPC::R16, PPC::R17, PPC::R18, PPC::R19,
PPC::R20, PPC::R21, PPC::R22, PPC::R23,
PPC::R24, PPC::R25, PPC::R26, PPC::R27,
PPC::R28, PPC::R29, PPC::R30, PPC::R31,
0);
case 'f':
return make_vector<unsigned>(PPC::F0 , PPC::F1 , PPC::F2 , PPC::F3 ,
PPC::F4 , PPC::F5 , PPC::F6 , PPC::F7 ,
PPC::F8 , PPC::F9 , PPC::F10, PPC::F11,
PPC::F12, PPC::F13, PPC::F14, PPC::F15,
PPC::F16, PPC::F17, PPC::F18, PPC::F19,
PPC::F20, PPC::F21, PPC::F22, PPC::F23,
PPC::F24, PPC::F25, PPC::F26, PPC::F27,
PPC::F28, PPC::F29, PPC::F30, PPC::F31,
0);
// GCC RS6000 Constraint Letters
switch (Constraint[0]) {
case 'b': // R1-R31
case 'r': // R0-R31
if (VT == MVT::i64 && PPCSubTarget.isPPC64())
return std::make_pair(0U, PPC::G8RCRegisterClass);
return std::make_pair(0U, PPC::GPRCRegisterClass);
case 'f':
if (VT == MVT::f32)
return std::make_pair(0U, PPC::F4RCRegisterClass);
else if (VT == MVT::f64)
return std::make_pair(0U, PPC::F8RCRegisterClass);
break;
case 'v':
return make_vector<unsigned>(PPC::V0 , PPC::V1 , PPC::V2 , PPC::V3 ,
PPC::V4 , PPC::V5 , PPC::V6 , PPC::V7 ,
PPC::V8 , PPC::V9 , PPC::V10, PPC::V11,
PPC::V12, PPC::V13, PPC::V14, PPC::V15,
PPC::V16, PPC::V17, PPC::V18, PPC::V19,
PPC::V20, PPC::V21, PPC::V22, PPC::V23,
PPC::V24, PPC::V25, PPC::V26, PPC::V27,
PPC::V28, PPC::V29, PPC::V30, PPC::V31,
0);
case 'y':
return make_vector<unsigned>(PPC::CR0, PPC::CR1, PPC::CR2, PPC::CR3,
PPC::CR4, PPC::CR5, PPC::CR6, PPC::CR7,
0);
return std::make_pair(0U, PPC::VRRCRegisterClass);
case 'y': // crrc
return std::make_pair(0U, PPC::CRRCRegisterClass);
}
}
return std::vector<unsigned>();
return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
}
// isOperandValidForConstraint
SDOperand PPCTargetLowering::
isOperandValidForConstraint(SDOperand Op, char Letter, SelectionDAG &DAG) {

10
lib/Target/PowerPC/PPCISelLowering.h
View File

@ -18,6 +18,7 @@
#include "llvm/Target/TargetLowering.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "PPC.h"
#include "PPCSubtarget.h"
namespace llvm {
namespace PPCISD {
@ -168,8 +169,9 @@ namespace llvm {
class PPCTargetLowering : public TargetLowering {
int VarArgsFrameIndex; // FrameIndex for start of varargs area.
int ReturnAddrIndex; // FrameIndex for return slot.
const PPCSubtarget &PPCSubTarget;
public:
PPCTargetLowering(TargetMachine &TM);
PPCTargetLowering(PPCTargetMachine &TM);
/// getTargetNodeName() - This method returns the name of a target specific
/// DAG node.
@ -191,9 +193,9 @@ namespace llvm {
MachineBasicBlock *MBB);
ConstraintType getConstraintType(char ConstraintLetter) const;
std::vector<unsigned>
getRegClassForInlineAsmConstraint(const std::string &Constraint,
MVT::ValueType VT) const;
std::pair<unsigned, const TargetRegisterClass*>
getRegForInlineAsmConstraint(const std::string &Constraint,
MVT::ValueType VT) const;
SDOperand isOperandValidForConstraint(SDOperand Op, char ConstraintLetter,
SelectionDAG &DAG);