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add support for folding immediates into stores when they

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are due to argument passing in calls.  This is significant because
it hits all immediate arguments to calls on x86-32.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57556 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-10-15 05:38:32 +00:00
parent 438949aa9d
commit 241ab47ac1
1 changed files with 20 additions and 20 deletions
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38
lib/Target/X86/X86FastISel.cpp
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@ -240,28 +240,18 @@ X86FastISel::X86FastEmitStore(MVT VT, unsigned Val,
// Get opcode and regclass of the output for the given store instruction.
unsigned Opc = 0;
switch (VT.getSimpleVT()) {
case MVT::f80: // No f80 support yet.
default: return false;
case MVT::i8:
Opc = X86::MOV8mr;
break;
case MVT::i16:
Opc = X86::MOV16mr;
break;
case MVT::i32:
Opc = X86::MOV32mr;
break;
case MVT::i64:
Opc = X86::MOV64mr; // Must be in x86-64 mode.
break;
case MVT::i8: Opc = X86::MOV8mr; break;
case MVT::i16: Opc = X86::MOV16mr; break;
case MVT::i32: Opc = X86::MOV32mr; break;
case MVT::i64: Opc = X86::MOV64mr; break; // Must be in x86-64 mode.
case MVT::f32:
Opc = Subtarget->hasSSE1() ? X86::MOVSSmr : X86::ST_Fp32m;
break;
case MVT::f64:
Opc = Subtarget->hasSSE2() ? X86::MOVSDmr : X86::ST_Fp64m;
break;
case MVT::f80:
// No f80 support yet.
return false;
}
addFullAddress(BuildMI(MBB, TII.get(Opc)), AM).addReg(Val);
@ -297,7 +287,6 @@ bool X86FastISel::X86FastEmitStore(MVT VT, Value *Val,
unsigned ValReg = getRegForValue(Val);
if (ValReg == 0)
// Unhandled operand. Halt "fast" selection and bail.
return false;
return X86FastEmitStore(VT, ValReg, AM);
@ -995,10 +984,12 @@ bool X86FastISel::X86SelectCall(Instruction *I) {
}
// Deal with call operands first.
SmallVector<unsigned, 4> Args;
SmallVector<MVT, 4> ArgVTs;
SmallVector<ISD::ArgFlagsTy, 4> ArgFlags;
SmallVector<Value*, 8> ArgVals;
SmallVector<unsigned, 8> Args;
SmallVector<MVT, 8> ArgVTs;
SmallVector<ISD::ArgFlagsTy, 8> ArgFlags;
Args.reserve(CS.arg_size());
ArgVals.reserve(CS.arg_size());
ArgVTs.reserve(CS.arg_size());
ArgFlags.reserve(CS.arg_size());
for (CallSite::arg_iterator i = CS.arg_begin(), e = CS.arg_end();
@ -1028,6 +1019,7 @@ bool X86FastISel::X86SelectCall(Instruction *I) {
Flags.setOrigAlign(OriginalAlignment);
Args.push_back(Arg);
ArgVals.push_back(*i);
ArgVTs.push_back(ArgVT);
ArgFlags.push_back(Flags);
}
@ -1097,6 +1089,14 @@ bool X86FastISel::X86SelectCall(Instruction *I) {
X86AddressMode AM;
AM.Base.Reg = StackPtr;
AM.Disp = LocMemOffset;
Value *ArgVal = ArgVals[VA.getValNo()];
// If this is a really simple value, emit this with the Value* version of
// X86FastEmitStore. If it isn't simple, we don't want to do this, as it
// can cause us to reevaluate the argument.
if (isa<ConstantInt>(ArgVal) || isa<ConstantPointerNull>(ArgVal))
X86FastEmitStore(ArgVT, ArgVal, AM);
else
X86FastEmitStore(ArgVT, Arg, AM);
}
}