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Changes from Git (git http://labmaster3.local/git/llvm-project.git)

Summary

  1. [mips] Fix sc, scs, ll, lld instructions expanding (details)
Commit 11074bfffee022fbbdca177a96dc2eaf2df6d936 by simon
[mips] Fix sc, scs, ll, lld instructions expanding
There are a couple of bugs with the sc, scs, ll, lld instructions
expanding:
1. On R6 these instruction pack immediate offset into a 9-bit field. Now
if an immediate exceeds 9-bits assembler does not perform expansion and
just rejects such instruction.
2. On 64-bit non-PIC code if an operand is a symbol assembler generates
incorrect sequence of instructions. It uses R_MIPS_HI16 and R_MIPS_LO16
relocations and skips R_MIPS_HIGHEST and R_MIPS_HIGHER ones.
To solve these problems this patch:
- Introduces `mem_simm9_exp` to mark 9-bit memory immediate operands
which require expansion. Probably later all `mem_simm9` operands will be
able to migrate on `mem_simm9_exp` and we rename it to `mem_simm9`.
- Adds new `OPERAND_MEM_SIMM9` operand type and assigns it to the
`mem_simm9_exp`. That allows to know operand size in the
`processInstruction` method and decide whether we need to expand
instruction.
- Adds `expandMem9Inst` method to expand instructions with 9-bit memory
immediate operand. This method just load immediate into a "base"
register used by origibal instruction:
   sc $2, 256($sp) => addiu  $1, $sp, 256
                     sc     $2, 0($1)
- Fix `expandMem16Inst` to support a correct set of relocations for
symbol loading in case of 64-bit non-PIC code.
   ll $12, symbol => lui    $12, 0
                        R_MIPS_HIGHEST symbol
                    daddiu $12, $12, 0
                        R_MIPS_HIGHER symbol
                    dsll   $12, $12, 16
                    daddiu $12, $12, 0
                        R_MIPS_HI16 symbol
                    dsll   $12, $12, 16
                    ll     $12, 0($12)
                        R_MIPS_LO16 symbol
- Fix `expandMem16Inst` to unify handling of 3 and 4 operands
instructions.
- Delete unused now `MipsTargetStreamer::emitSCWithSymOffset` method.
Task for next patches - implement expanding for other instructions use
`mem_simm9` operand and other `mem_simm##` operands.
Differential Revision: https://reviews.llvm.org/D70648
The file was modifiedllvm/lib/Target/Mips/MipsTargetStreamer.h
The file was modifiedllvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
The file was modifiedllvm/lib/Target/Mips/Mips32r6InstrInfo.td
The file was modifiedllvm/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp
The file was modifiedllvm/test/MC/Mips/sc-expansion.s
The file was addedllvm/test/MC/Mips/scd-expansion.s
The file was modifiedllvm/lib/Target/Mips/MCTargetDesc/MipsBaseInfo.h
The file was modifiedllvm/lib/Target/Mips/MCTargetDesc/MipsTargetStreamer.cpp
The file was modifiedllvm/lib/Target/Mips/MipsInstrInfo.td
The file was addedllvm/test/MC/Mips/lld-expansion.s
The file was addedllvm/test/MC/Mips/ll-expansion.s
The file was modifiedllvm/lib/Target/Mips/Mips64r6InstrInfo.td