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Allow shufps x, x, mask to be converted to pshufd x, mask to save a move.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28565 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-05-30 20:26:50 +00:00
parent eaf1e31775
commit ccba76bb25
2 changed files with 13 additions and 1 deletions
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13
lib/Target/X86/X86InstrInfo.cpp
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@ -102,7 +102,6 @@ unsigned X86InstrInfo::isStoreToStackSlot(MachineInstr *MI,
}
/// convertToThreeAddress - This method must be implemented by targets that
/// set the M_CONVERTIBLE_TO_3_ADDR flag. When this flag is set, the target
/// may be able to convert a two-address instruction into a true
@ -118,6 +117,18 @@ MachineInstr *X86InstrInfo::convertToThreeAddress(MachineInstr *MI) const {
unsigned Dest = MI->getOperand(0).getReg();
unsigned Src = MI->getOperand(1).getReg();
switch (MI->getOpcode()) {
default: break;
case X86::SHUFPSrri: {
assert(MI->getNumOperands() == 4 && "Unknown shufps instruction!");
unsigned A = MI->getOperand(0).getReg();
unsigned B = MI->getOperand(1).getReg();
unsigned C = MI->getOperand(2).getReg();
unsigned M = MI->getOperand(3).getImmedValue();
return BuildMI(X86::PSHUFDri, 2, A).addReg(B).addImm(M);
}
}
// FIXME: None of these instructions are promotable to LEAs without
// additional information. In particular, LEA doesn't set the flags that
// add and inc do. :(

1
lib/Target/X86/X86InstrSSE.td
View File

@ -1218,6 +1218,7 @@ def CMPPDrmi : PDIi8<0xC2, MRMSrcMem,
// Shuffle and unpack instructions
let isTwoAddress = 1 in {
let isConvertibleToThreeAddress = 1 in // Convert to pshufd
def SHUFPSrri : PSIi8<0xC6, MRMSrcReg,
(ops VR128:$dst, VR128:$src1, VR128:$src2, i32i8imm:$src3),
"shufps {$src3, $src2, $dst|$dst, $src2, $src3}",