[llvm-dev] llvm-objdump cannot recognize mul&mulh RISC-V M Instructions

[Junning Wu via llvm-dev]

I am using llvm-project compiling risc-v programs.

llvm-project version:dd8a2013dc1804be1b7d9cffacad2e984300bd22

Instructons to build LLVM+clang:

```
cmake -G Ninja
-DCMAKE_INSTALL_PREFIX=/home/llvm/workspace/llvm/llvm-project/llvm_install
-DCMAKE_BUILD_TYPE="Release"
-DDEFAULT_SYSROOT="/home/llvm/workspace/riscv/riscv-tc-20200220/bin/riscv32-unknown-elf"
-DGCC_INSTALL_PREFIX="/home/llvm/workspace/riscv/riscv-tc-20200220"
-DLLVM_DEFAULT_TARGET_TRIPLE="riscv32-unknown-elf"
-DLLVM_ENABLE_PROJECTS="clang;lld;libc" -DLLVM_TARGETS_TO_BUILD="RISCV"
../llvm
```

Instructions to compile and dump:

```
RISCV_GCC_OPTS ?= -mcmodel=medany -static -O3 -std=gnu99 -fno-common
-fno-builtin -march=rv32im -mabi=ilp32 -DMB_ADDR=0x80FFFFC
--target=riscv64-unknown-elf
--sysroot=/home/llvm/workspace/riscv/riscv-tc-20200220/bin/riscv64-unknown-elf
--gcc-toolchain=/home/llvm/workspace/riscv/riscv-tc-20200220
RISCV_LINK_OPTS ?= -static -nostdlib -nostartfiles -lm -lgcc -T
/home/llvm/workspace/HRV_IDE/common/test.ld
newlib_dir :=
/home/llvm/workspace/llvm/llvm-project/llvm_install/riscv64-unknown-elf/include
src_dir := $(WORK_DIR)/src/$(PROJ)
incs  += -I$(WORK_DIR)/env -I$(WORK_DIR)/common -I$(src_dir) -I$(newlib_dir)
src := $(wildcard $(src_dir)/*.c) $(wildcard $(WORK_DIR)/common/*.c)
$(wildcard $(WORK_DIR)/common/*.S)

$(RISCV_clang) $(incs) $(RISCV_GCC_OPTS) -o $(WORK_DIR)/build/$@/$@ $(src)
$(RISCV_LINK_OPTS) --verbose
$(RISCV_OBJDUMP) -d $(WORK_DIR)/build/$@/$@ > $(WORK_DIR)/build/$@/$@.S
$(RISCV_LLVM_OBJDUMP) --arch=rv32imac -D $(WORK_DIR)/build/$@/$@ >
$(WORK_DIR)/build/$@/$@.ASM
```
gcc objdump result:
```
4001168: 00052383           lw t2,0(a0)
 400116c: 979a                 add a5,a5,t1
 400116e: 439c                 lw a5,0(a5)
 4001170: 0308a533           mulhsu a0,a7,a6
```

llvm-objdump result:

```
 4001168: 83 23 05 00                   lw t2, 0(a0)
 400116c: 9a 97                         add a5, a5, t1
 400116e: 9c 43                         lw a5, 0(a5)
 4001170: 33 a5 08 03                   <unknown>
```

Does anyone knows what is the problem and how to fix it?
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