[PATCH] D144002: [RISCV] Add vendor-defined XTheadMemPair (two-GPR Memory Operations) extension

[Philipp Tomsich via Phabricator via llvm-commits]

philipp.tomsich added inline comments.


================
Comment at: llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp:2665
+      SMLoc Loc = Operands[1]->getStartLoc();
+      return Error(Loc, "The source register and destination registers "
+                        "cannot be equal.");
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craig.topper wrote:
> Does this restrict apply for TH_SDD/TH_SWD? I don't see it in the spec.
Given that QEMU had this constraint, but it was missing in the spec, I checked on an Allwinner D1.
Turns out that LDD works with with $rs1 == $rs2 and with $rs1 == $rs2 == $rd.


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  https://reviews.llvm.org/D144002/new/

https://reviews.llvm.org/D144002