[PATCH] D20153: [ARM] PR25722 Delay ARM constant pool creation

[Peter Smith via llvm-commits]

peter.smith created this revision.
peter.smith added reviewers: rengolin, olista01, t.p.northover.
peter.smith added a subscriber: llvm-commits.
Herald added subscribers: rengolin, aemerson.

This is first in a series of patches to fix PR25722.
    
This change adds a new constant pool kind to ARMOperand. When parsing the operand for =immediate we create an instance of this operand rather than creating a constant pool entry and rewriting the operand.
    
As the new operand kind is only created for ldr rt,= we can make ldr rt,= an explicit pseudo instruction in ARM, Thumb and Thumb2
    
The pseudo instruction is expanded in processInstruction(). This creates the constant pool and transforms the pseudo instruction into a pc-relative ldr to the constant pool.
    
There are no functional changes and no modifications needed to existing tests.

http://reviews.llvm.org/D20153

Files:
  lib/Target/ARM/ARMInstrFormats.td
  lib/Target/ARM/ARMInstrInfo.td
  lib/Target/ARM/ARMInstrThumb.td
  lib/Target/ARM/ARMInstrThumb2.td
  lib/Target/ARM/AsmParser/ARMAsmParser.cpp

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