https://bugs.llvm.org/show_bug.cgi?id=39332
Bug ID: 39332
Summary: [AMDGPU][MC][DISASSEMBLER][GFX8+] 64-bit instructions
cannot be reassembled when used with a 1/2pi literal
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: AMDGPU
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
To use 1/2pi literal with 64-bit instructions, it is necessary to specify this
literal as 0.159154943091895317852646485335 or use a hex constant. However
disassembler decodes it as 0.15915494 so the disassembled code cannot be
assembled again.
An example:
v_add_f64 v[0:1], v[0:1], 0.159154943091895317852646485335
Correctly encoded as
0x00,0x00,0x80,0xd2,0x00,0xf1,0x01,0x00
However, when disassembled, the code results in
v_add_f64 v[0:1], v[0:1], 0.15915494
This is a different constant and the code will fail to assemble.
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