* Writing out ELF files is close to working but the following needs to
be examined more closely:
- - ELF files are written with the wrong E_MACHINE value because
- ELFObjectWriter::WriteHeader function does not yet support
- target specific E_MACHINE values.
- - ELF relocation records are incorrect because the function
- ELFObjectWriter::RecordRelocation is hard coded for X86/X86-64.
- Relocations use 2-byte / 4-byte to terminology in reference to
the size of the immediate value being changed. The Xilinx
terminology seems to be (???) 4-byte / 8-byte in reference
to the number of bytes of instructions that are being changed.
- - BRLID and like instructions are always assumed to use a 4-byte
- immediate value for the relocation and BEQID and like instructions
- are always assumed to use a 2-byte immediate value for the relocation.
- I think this means that conditional branches like BEQID can only
- branch += 32768 bytes (~8192 instructions). We should allow conditional
- branches to use 4-byte relocations but I'm not sure how to do that
- right now.
* Code generation seems to work relatively well now but the following
needs to be examined more closely:
- The stack layout needs to be examined to make sure it meets
the standard, especially in regards to var arg functions.
- - The delay slot filler is ad hoc but seems to work. Load and
- store instructions were prevented from being moved to delay
- slots but I'm not sure that is necessary.
+ - Look at the MBlazeGenFastISel.inc stuff and make use of it
+ if appropriate.
+
+* A basic assembly parser is present now and seems to parse most things.
+ There are a few things that need to be looked at:
+ - There are some instructions that are not generated by the backend
+ and have not been tested as far as the parser is concerned.
+ - The assembly parser does not use many MicroBlaze specific directives.
+ I should investigate if there are MicroBlaze specific directive and,
+ if there are, add them.
projects / oota-llvm.git / blobdiff