[llvm] [RISCV] Add symbol parsing support for XAndesPerf branch and gp-related instructions (PR #137748)

[Sam Elliott via llvm-commits]

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@@ -26,3 +26,14 @@ ELF_RISCV_NONSTANDARD_RELOC(QUALCOMM, R_RISCV_QC_ABS20_U,    192)
 ELF_RISCV_NONSTANDARD_RELOC(QUALCOMM, R_RISCV_QC_E_BRANCH,   193)
 ELF_RISCV_NONSTANDARD_RELOC(QUALCOMM, R_RISCV_QC_E_32,       194)
 ELF_RISCV_NONSTANDARD_RELOC(QUALCOMM, R_RISCV_QC_E_JUMP_PLT, 195)
+
+// Andes Nonstandard Relocations
+ELF_RISCV_NONSTANDARD_RELOC(ANDES, R_RISCV_NDS_BRANCH_10,    241)
+ELF_RISCV_NONSTANDARD_RELOC(ANDES, R_RISCV_NDS_GPREL_18S0_I, 246)
+ELF_RISCV_NONSTANDARD_RELOC(ANDES, R_RISCV_NDS_GPREL_17S1_I, 247)
+ELF_RISCV_NONSTANDARD_RELOC(ANDES, R_RISCV_NDS_GPREL_17S2_I, 248)
+ELF_RISCV_NONSTANDARD_RELOC(ANDES, R_RISCV_NDS_GPREL_17S3_I, 249)
+ELF_RISCV_NONSTANDARD_RELOC(ANDES, R_RISCV_NDS_GPREL_18S0_S, 250)
+ELF_RISCV_NONSTANDARD_RELOC(ANDES, R_RISCV_NDS_GPREL_17S1_S, 251)
+ELF_RISCV_NONSTANDARD_RELOC(ANDES, R_RISCV_NDS_GPREL_17S2_S, 252)
+ELF_RISCV_NONSTANDARD_RELOC(ANDES, R_RISCV_NDS_GPREL_17S3_S, 253)
----------------
lenary wrote:

Is there non-llvm documentation for these relocations and the instructions/formats they apply to?

Separately, I am thinking of refactoring this file as with these changes, ELD (an external user) will break: https://github.com/qualcomm/eld/blob/b3197fa1e54b470d36d8bdff7a10b469287caa3a/lib/Target/RISCV/RISCVRelocationInternal.h#L70 - this is because I didn't do a good job originally to predict this, rather than a problem you have caused with these changes.

https://github.com/llvm/llvm-project/pull/137748