https://bugs.llvm.org/show_bug.cgi?id=39320
Bug ID: 39320
Summary: [AMDGPU][MC] Default MIMG dmask is 0 which is illegal
for GATHER/ATOMIC opcodes
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
In the current implementation, dmask is an optional modifier. When omitted,
dmask value defaults to zero.
However there are MIMG opcodes for which zero dmask is illegal:
- all GATHER opcodes
- all ATOMIC opcodes
This result in unclear behavior and error messages. For example, the code
image_gather4 v[0:3], v[0:1], s[0:7], s[0:3]
trigger the following error message:
invalid image_gather dmask: only one bit must be set
I believe that an optional modifier should always provide a legal value.
Unfortunately there is no dmask value that is legal for all opcodes.
Should we change dmask to be a mandatory modifier?
Any suggestions?
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