Decompilation of MIPS LWL/LWR/SWL/SWR doesn't work

Describe the bug When LWL/LWR/SWL/SWR instructions are found, the decompilation just ignores the code it should generate for them.

As you can see on the example, the first line of generated code is at 0x80020efc, while all the code before that is ignored (it should be many consecutive assignments to the local_20 array and other places)

Environment (please complete the following information):

• OS: macOS 10.14.2
• Java Version: 11.0
• Ghidra Version: 9.0

[caheckman]

This is not an issue with the LWL/LWR/SWL/SWR instructions but is due to over aggressive dead-code elimination. A fix will be available in master on the next update. I was able to verify that this particular example now shows more initialization code. Thanks for submitting this.

[hllhll]

I’m getting similar issues on Atmel AVR32(LD.B LD.W LD.D ST.B ST.W ST.D), and a friend of mine on ARM(ldmia stmia).

In both cases, code is OK at the beginning, but after “Commit locals” or renaming/retyping in decompiler, some of the code vanishes (Stack initialization),

I suspect if the pointer were passed to a function the initialization might show up

In my case function calls to memset on stack are kept; initialization still missing if we define variables at the stack position. In addition, in both cases P-Code looks OK too. ( Note: arrived here via other issue