[llvm] [AVR] No cli for SPWRITE on XMEGA (PR #147210)

[Tom Vijlbrief via llvm-commits]

================
@@ -2531,27 +2531,46 @@ bool AVRExpandPseudo::expand<AVR::SPWRITE>(Block &MBB, BlockIt MBBI) {
   unsigned Flags = MI.getFlags();
   TRI->splitReg(SrcReg, SrcLoReg, SrcHiReg);
 
-  buildMI(MBB, MBBI, AVR::INRdA)
-      .addReg(STI.getTmpRegister(), RegState::Define)
-      .addImm(STI.getIORegSREG())
-      .setMIFlags(Flags);
-
-  buildMI(MBB, MBBI, AVR::BCLRs).addImm(0x07).setMIFlags(Flags);
-
-  buildMI(MBB, MBBI, AVR::OUTARr)
-      .addImm(0x3e)
-      .addReg(SrcHiReg, getKillRegState(SrcIsKill))
-      .setMIFlags(Flags);
-
-  buildMI(MBB, MBBI, AVR::OUTARr)
-      .addImm(STI.getIORegSREG())
-      .addReg(STI.getTmpRegister(), RegState::Kill)
-      .setMIFlags(Flags);
-
-  buildMI(MBB, MBBI, AVR::OUTARr)
-      .addImm(0x3d)
-      .addReg(SrcLoReg, getKillRegState(SrcIsKill))
-      .setMIFlags(Flags);
+  // From the XMEGA series manual:
----------------
tomtor wrote:

https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-8331-8-and-16-bit-AVR-Microcontroller-XMEGA-AU_Manual.pdf page 17 SPL description.

It is in every chip full manual in the section describing SPL

https://github.com/llvm/llvm-project/pull/147210