https://bugs.llvm.org/show_bug.cgi?id=49164
Bug ID: 49164
Summary: [AMDGPU][MC][GFX10] Incorrect handling of FLAT
instructions with saddr=null
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: AMDGPU
Assignee: unassignedb...@nondot.org
Reporter: dpreobrazhen...@luxoft.com
CC: llvm-bugs@lists.llvm.org
FLAT GLOBAL instructions with saddr=null are handled incorrectly. 'null' is an
alias for 'off' but it is handled as a regular register and results in an
invalid vaddr size.
Examples:
global_atomic_add v1, v2, null
This is not a valid code but it is assembled ok and results in the same
encoding as the following legal instruction:
global_atomic_add v[1:2], v2, off
There is a similar issue with FLAT SCRATCH instructions. For example, the
following instruction is illegal, but it is accepted by llvm assembler:
scratch_load_ubyte v1, off, null
The produced code is the same as generated for the following legal instruction:
scratch_load_ubyte v1, v0, off
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