RPCS3/llvm
1
0
Fork 0
mirror of https://github.com/RPCS3/llvm.git synced 2024-12-21 11:38:35 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Fold loads into sign/zero extends. instead of:

Browse Source 
mov %AL, BYTE PTR [%EDX + l18_length_code]
  movzx %EAX, %AL

Emit:

  movzx %EAX, BYTE PTR [%EDX + l18_length_code]


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19489 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-01-11 23:33:00 +00:00
parent 837caa7223
commit dbba22fa2a
1 changed files with 25 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
lib/Target/X86/X86ISelPattern.cpp
View File

@ -1011,18 +1011,31 @@ unsigned ISel::SelectExpr(SDOperand N) {
case ISD::ZERO_EXTEND: {
int DestIs16 = N.getValueType() == MVT::i16;
int SrcIs16 = N.getOperand(0).getValueType() == MVT::i16;
Tmp1 = SelectExpr(N.getOperand(0));
// FIXME: This hack is here for zero extension casts from bool to i8. This
// would not be needed if bools were promoted by Legalize.
if (N.getValueType() == MVT::i8) {
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, X86::MOV8rr, 1, Result).addReg(Tmp1);
return Result;
}
if (isFoldableLoad(N.getOperand(0))) {
static const unsigned Opc[3] = {
X86::MOVZX32rm8, X86::MOVZX32rm16, X86::MOVZX16rm8
};
X86AddressMode AM;
EmitFoldedLoad(N.getOperand(0), AM);
addFullAddress(BuildMI(BB, Opc[SrcIs16+DestIs16*2], 4, Result), AM);
return Result;
}
static const unsigned Opc[3] = {
X86::MOVZX32rr8, X86::MOVZX32rr16, X86::MOVZX16rr8
};
Tmp1 = SelectExpr(N.getOperand(0));
BuildMI(BB, Opc[SrcIs16+DestIs16*2], 1, Result).addReg(Tmp1);
return Result;
}
@ -1034,6 +1047,17 @@ unsigned ISel::SelectExpr(SDOperand N) {
assert(N.getOperand(0).getValueType() != MVT::i1 &&
"Sign extend from bool not implemented!");
if (isFoldableLoad(N.getOperand(0))) {
static const unsigned Opc[3] = {
X86::MOVSX32rm8, X86::MOVSX32rm16, X86::MOVSX16rm8
};
X86AddressMode AM;
EmitFoldedLoad(N.getOperand(0), AM);
addFullAddress(BuildMI(BB, Opc[SrcIs16+DestIs16*2], 4, Result), AM);
return Result;
}
static const unsigned Opc[3] = {
X86::MOVSX32rr8, X86::MOVSX32rr16, X86::MOVSX16rr8
};
@ -2164,7 +2188,6 @@ void ISel::Select(SDOperand N) {
return;
}
}
//Opc = TabPtr[Opc];
}
}
}