https://bugs.llvm.org/show_bug.cgi?id=40806
Bug ID: 40806
Summary: [AMDGPU][MC] Different conversion rules for literals
and inlinable constants
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
Currently assembler has different conversion rules for integer literals and
integer inlinable constants which may confuse users.
For integer inlinable constants the input number is truncated to the size of
expected operand type without any checks. For example:
// src0 is encoded as -1
// high bits "101" are ignored
v_add_f32 v0, 0x101ffffffff, v0
For integer literals, assembler checks that the truncated bits are either all
zero or all ones. In the latter case the MSB of the result after truncation
must be 1. For example, the following code will trigger an error:
v_add_f32 v0, 0x101ffffff00, v0
I believe conversion rules for inlinable constants and for literals should be
as close as possible.
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