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The three-operand MULT and MULTU are the only R5900-specific instructions emitted by GCC 7.3. The R5900 also implements the three- operand MADD and MADDU instructions, but they are omitted in QEMU for now since they are absent in programs compiled by current GCC versions. Likewise, the R5900-specific pipeline 1 instruction variants MULT1, MULTU1, DIV1, DIVU1, MADD1, MADDU1, MFHI1, MFLO1, MTHI1 and MTLO1 are omitted here as well. Backports commit 21e8e8b230af38b6bd8c953fa5f31e4a5a128e1c from qemu |
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