forked from OSchip/llvm-project
2b6917b020
type (in addition to the memory type).
The *LoadExt* legalization handling used to only have one type, the
memory type. This forced users to assume that as long as the extload
for the memory type was declared legal, and the result type was legal,
the whole extload was legal.
However, this isn't always the case. For instance, on X86, with AVX,
this is legal:
v4i32 load, zext from v4i8
but this isn't:
v4i64 load, zext from v4i8
Whereas v4i64 is (arguably) legal, even without AVX2.
Note that the same thing was done a while ago for truncstores (r46140),
but I assume no one needed it yet for extloads, so here we go.
Calls to getLoadExtAction were changed to add the value type, found
manually in the surrounding code.
Calls to setLoadExtAction were mechanically changed, by wrapping the
call in a loop, to match previous behavior. The loop iterates over
the MVT subrange corresponding to the memory type (FP vectors, etc...).
I also pulled neighboring setTruncStoreActions into some of the loops;
those shouldn't make a difference, as the additional types are illegal.
(e.g., i128->i1 truncstores on PPC.)
No functional change intended.
Differential Revision: http://reviews.llvm.org/D6532
llvm-svn: 225421
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|---|---|---|
| .. | ||
| InstPrinter | ||
| MCTargetDesc | ||
| TargetInfo | ||
| CMakeLists.txt | ||
| LLVMBuild.txt | ||
| MSP430.h | ||
| MSP430.td | ||
| MSP430AsmPrinter.cpp | ||
| MSP430BranchSelector.cpp | ||
| MSP430CallingConv.td | ||
| MSP430FrameLowering.cpp | ||
| MSP430FrameLowering.h | ||
| MSP430ISelDAGToDAG.cpp | ||
| MSP430ISelLowering.cpp | ||
| MSP430ISelLowering.h | ||
| MSP430InstrFormats.td | ||
| MSP430InstrInfo.cpp | ||
| MSP430InstrInfo.h | ||
| MSP430InstrInfo.td | ||
| MSP430MCInstLower.cpp | ||
| MSP430MCInstLower.h | ||
| MSP430MachineFunctionInfo.cpp | ||
| MSP430MachineFunctionInfo.h | ||
| MSP430RegisterInfo.cpp | ||
| MSP430RegisterInfo.h | ||
| MSP430RegisterInfo.td | ||
| MSP430SelectionDAGInfo.cpp | ||
| MSP430SelectionDAGInfo.h | ||
| MSP430Subtarget.cpp | ||
| MSP430Subtarget.h | ||
| MSP430TargetMachine.cpp | ||
| MSP430TargetMachine.h | ||
| Makefile | ||
| README.txt | ||
README.txt
//===---------------------------------------------------------------------===// // MSP430 backend. //===---------------------------------------------------------------------===// DISCLAIMER: Thid backend should be considered as highly experimental. I never seen nor worked with this MCU, all information was gathered from datasheet only. The original intention of making this backend was to write documentation of form "How to write backend for dummies" :) Thes notes hopefully will be available pretty soon. Some things are incomplete / not implemented yet (this list surely is not complete as well): 1. Verify, how stuff is handling implicit zext with 8 bit operands (this might be modelled currently in improper way - should we need to mark the superreg as def for every 8 bit instruction?). 2. Libcalls: multiplication, division, remainder. Note, that calling convention for libcalls is incomptible with calling convention of libcalls of msp430-gcc (these cannot be used though due to license restriction). 3. Implement multiplication / division by constant (dag combiner hook?). 4. Implement non-constant shifts. 5. Implement varargs stuff. 6. Verify and fix (if needed) how's stuff playing with i32 / i64. 7. Implement floating point stuff (softfp?) 8. Implement instruction encoding for (possible) direct code emission in the future. 9. Since almost all instructions set flags - implement brcond / select in better way (currently they emit explicit comparison). 10. Handle imm in comparisons in better way (see comment in MSP430InstrInfo.td) 11. Implement hooks for better memory op folding, etc.