The 'ELPM' instruction has three forms:
--------------------------
| form | feature |
| ----------- | -------- |
| ELPM | hasELPM |
| ELPM Rd, Z | hasELPMX |
| ELPM Rd, Z+ | hasELPMX |
--------------------------
The second form is always used in the expansion of pseudo instructions
LPMWRdZ/ELPMWRdZ. But for devices without ELPMX and with only ELPM,
only the first form can be used.
Reviewed By: aykevl, Miss_Grape
Differential Revision: https://reviews.llvm.org/D141264
The 'LPM' instruction has three forms:
------------------------
| form | feature |
| ---------- | --------|
| LPM | hasLPM |
| LPM Rd, Z | hasLPMX |
| LPM Rd, Z+ | hasLPMX |
------------------------
The second form is always selected in ISelDAGToDAG, even on devices
without FeatureLPMX. This patch emits "LPM + MOV" on devices with
only FeatureLPM.
Reviewed By: jacquesguan
Differential Revision: https://reviews.llvm.org/D141246
The 'ELPM' instruction has three forms:
--------------------------
| form | feature |
| ----------- | -------- |
| ELPM | hasELPM |
| ELPM Rd, Z | hasELPMX |
| ELPM Rd, Z+ | hasELPMX |
--------------------------
The second form is always used in the expansion of the pseudo
instruction 'ELPMBRdZ'. But for devices without ELPMX but only
with ELPM, only the first form can be emitted.
Reviewed By: jacquesguan
Differential Revision: https://reviews.llvm.org/D141221
These operands are illegal and rejected by avr-gcc.
subi r24, -lo8(symobl+offset)
sbci r25, -hi8(symobl+offset)
And their correct form should be
subi r24, lo8(-(symobl+offset))
sbci r25, hi8(-(symobl+offset))
Reviewed By: aykevl
Differential Revision: https://reviews.llvm.org/D140473
