[llvm-dev] How to add a pass to do zero check for all DIV instructions

[石博文 via llvm-dev]

Hi. I'm a new learner for LLVM. I want to write a pass to add some custom
instructions to check zero for DIV. （X86-64 architecture）

before:
```
IDIV EBX
```

after:
```
TEST EBX, EBX
JNZ L1
MOV EBX, 1
L1:
IDIV EBX
```

I think it's need to modify some code in instruction generate pass, but I
don't know where is the relation files.

-- 
*B. W. Shek*
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