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Instruction select constant arguments correctly

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llvm-svn: 4297
This commit is contained in:
Chris Lattner 2002-10-27 21:16:59 +00:00
parent 046cb65220
commit e4e731b30c
1 changed files with 41 additions and 0 deletions
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41
lib/Target/X86/InstSelectSimple.cpp
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@ -9,6 +9,7 @@
#include "llvm/Function.h"
#include "llvm/iTerminators.h"
#include "llvm/Type.h"
#include "llvm/Constants.h"
#include "llvm/CodeGen/MFunction.h"
#include "llvm/CodeGen/MInstBuilder.h"
#include "llvm/Support/InstVisitor.h"
@ -56,6 +57,12 @@ namespace {
abort();
}
/// copyConstantToRegister - Output the instructions required to put the
/// specified constant into the specified register.
///
void copyConstantToRegister(Constant *C, unsigned Reg);
/// getReg - This method turns an LLVM value into a register number. This
/// is guaranteed to produce the same register number for a particular value
/// every time it is queried.
@ -66,6 +73,9 @@ namespace {
if (Reg == 0)
Reg = CurReg++;
if (Constant *C = dyn_cast<Constant>(V))
copyConstantToRegister(C, Reg);
// FIXME: Constants should be thrown into registers here and appended to
// the end of the current basic block!
@ -75,6 +85,37 @@ namespace {
};
}
/// copyConstantToRegister - Output the instructions required to put the
/// specified constant into the specified register.
///
void ISel::copyConstantToRegister(Constant *C, unsigned R) {
assert (!isa<ConstantExpr>(C) && "Constant expressions not yet handled!\n");
switch (C->getType()->getPrimitiveID()) {
case Type::SByteTyID:
BuildMInst(BB, X86::MOVir8, R).addSImm(cast<ConstantSInt>(C)->getValue());
break;
case Type::UByteTyID:
BuildMInst(BB, X86::MOVir8, R).addZImm(cast<ConstantUInt>(C)->getValue());
break;
case Type::ShortTyID:
BuildMInst(BB, X86::MOVir16, R).addSImm(cast<ConstantSInt>(C)->getValue());
break;
case Type::UShortTyID:
BuildMInst(BB, X86::MOVir16, R).addZImm(cast<ConstantUInt>(C)->getValue());
break;
case Type::IntTyID:
BuildMInst(BB, X86::MOVir32, R).addSImm(cast<ConstantSInt>(C)->getValue());
break;
case Type::UIntTyID:
BuildMInst(BB, X86::MOVir32, R).addZImm(cast<ConstantUInt>(C)->getValue());
break;
default: assert(0 && "Type not handled yet!");
}
}
/// 'ret' instruction - Here we are interested in meeting the x86 ABI. As such,
/// we have the following possibilities:
///