llvm-project

80547cd7 - [X86][APX] Fix issues of suppressing APX for relocation (#139285)

[X86][APX] Fix issues of suppressing APX for relocation (#139285) 1. There is ADD64rm_ND instruction emitted with GOTPCREL relocation. Handled it in "Suppress APX for relocation" pass and transformed it to ADD64rm with register operand in non-rex2 register class. The relocation type R_X86_64_CODE_6_GOTPCRELX will be added later for APX enabled with relocation. 2. The register class for operands in instruction with relocation is updated to non-rex2 one in "Suppress APX for relocation" pass, but it may be updated/recomputed to larger register class (like GR64_NOREX2RegClass to GR64RegClass). Fixed by not updating the register class if it's non-rex2 register class and APX support for relocation is disabled. 3. After "Suppress APX for relocation" pass, the instruction with relocation may be folded with add NDD instruction to a add NDD instruction with relocation. The later will be emitted to instruction with APX relocation type which breaks backward compatibility. Fixed by not folding instruction with GOTPCREL relocation with NDD instruction. 4. If the register in operand 0 of instruction with relocation is used in the PHI instruction, it may be replaced with operand 0 of PHI instruction (maybe EGPR) after PHI elimination and Machine Copy Propagation pass. Fixed by suppressing EGPR in operand 0 of PHI instruction to avoid APX relocation types emitted.