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Convert SHUFPD with the same register for both sources to PSHUFD if it would prevent a register copy. Similar to SHUFPS, but requires the mask to be converted.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148112 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Craig Topper 2012-01-13 09:21:41 +00:00
parent 562659ff6b
commit 0518970dc8
2 changed files with 20 additions and 1 deletions
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18
lib/Target/X86/X86InstrInfo.cpp
View File

@ -1605,6 +1605,24 @@ X86InstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
.addReg(B, getKillRegState(isKill)).addImm(M);
break;
}
case X86::SHUFPDrri: {
assert(MI->getNumOperands() == 4 && "Unknown shufpd instruction!");
if (!TM.getSubtarget<X86Subtarget>().hasSSE2()) return 0;
unsigned B = MI->getOperand(1).getReg();
unsigned C = MI->getOperand(2).getReg();
if (B != C) return 0;
unsigned A = MI->getOperand(0).getReg();
unsigned M = MI->getOperand(3).getImm();
// Convert to PSHUFD mask.
M = ((M & 1) << 1) | ((M & 1) << 3) | ((M & 2) << 4) | ((M & 2) << 6)| 0x44;
NewMI = BuildMI(MF, MI->getDebugLoc(), get(X86::PSHUFDri))
.addReg(A, RegState::Define | getDeadRegState(isDead))
.addReg(B, getKillRegState(isKill)).addImm(M);
break;
}
case X86::SHL64ri: {
assert(MI->getNumOperands() >= 3 && "Unknown shift instruction!");
// NOTE: LEA doesn't produce flags like shift does, but LLVM never uses

3
lib/Target/X86/X86InstrSSE.td
View File

@ -2330,7 +2330,8 @@ let Constraints = "$src1 = $dst" in {
TB;
defm SHUFPD : sse12_shuffle<VR128, f128mem, v2f64,
"shufpd\t{$src3, $src2, $dst|$dst, $src2, $src3}",
memopv2f64, SSEPackedDouble>, TB, OpSize;
memopv2f64, SSEPackedDouble, 1 /* cvt to pshufd */>,
TB, OpSize;
}
let Predicates = [HasAVX] in {