[JITLink][RISCV] Improve R_RISCV_JAL

Only take the lower 12 bits of RawInstr.

Differential Revision: https://reviews.llvm.org/D140820

diff --git a/llvm/lib/ExecutionEngine/JITLink/ELF_riscv.cpp b/llvm/lib/ExecutionEngine/JITLink/ELF_riscv.cpp
index f60953f..3fcc45e 100644 (file)
--- a/llvm/lib/ExecutionEngine/JITLink/ELF_riscv.cpp
+++ b/llvm/lib/ExecutionEngine/JITLink/ELF_riscv.cpp
@@ -224,7 +224,8 @@ private:
       uint32_t Imm11 = extractBits(Value, 11, 1) << 20;
       uint32_t Imm19_12 = extractBits(Value, 12, 8) << 12;
       uint32_t RawInstr = *(little32_t *)FixupPtr;
-      *(little32_t *)FixupPtr = RawInstr | Imm20 | Imm10_1 | Imm11 | Imm19_12;
+      *(little32_t *)FixupPtr =
+          (RawInstr & 0xFFF) | Imm20 | Imm10_1 | Imm11 | Imm19_12;
       break;
     }
     case R_RISCV_CALL: {