LangRef: missing documentation for unary operations 'inv', 'neg', 'fneg'

[thielema]

Bugzilla Link	19377
Version	3.4
OS	Linux
CC	@xgupta

Extended Description

The operations 'inv', 'neg', 'fneg' are not mentioned in http://llvm.org/docs/LangRef.html

[xgupta]

'fneg' is documented here https://llvm.org/docs/LangRef.html#fneg-instruction.

But I didn't find an example for 'inv' and 'neg'. Would you please point to an LLVM IR (.ll) test case that show these instructions?

[thielema]

Maybe these instructions do not exist (anymore). But there are the C instruction builders:

$ fgrep BuildNot /usr/lib/llvm-13/include/llvm-c/Core.h
LLVMValueRef LLVMBuildNot(LLVMBuilderRef, LLVMValueRef V, const char *Name);
$ fgrep BuildNeg /usr/lib/llvm-13/include/llvm-c/Core.h
LLVMValueRef LLVMBuildNeg(LLVMBuilderRef, LLVMValueRef V, const char *Name);

[xgupta]

Ah, adding good-first-issue label for someone who want to contribute documentation for 'inv' and 'neg' similar to 'fneg'.

[llvmbot]

@llvm/issue-subscribers-good-first-issue

[SamTebbs33]

These instructions don't exist anymore so shouldn't be documented.