https://llvm.org/bugs/show_bug.cgi?id=28202
Bug ID: 28202
Summary: [mc] Some F64 insns (v_add_f64 etc.) -- negative
inline constants are not supported.
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: AMDGPU
Assignee: artem.tama...@amd.com
Reporter: artem.tama...@amd.com
CC: llvm-bugs@lists.llvm.org, nikolay.haus...@amd.com
Classification: Unclassified
Created attachment 16583
--> https://llvm.org/bugs/attachment.cgi?id=16583&action=edit
00204.tests_tg_gfx7_asm_lit1_bug.06.08.min.v_add_etc_f64--iconst_encoding.zip
Example of failing instruction:
> v_add_f64 v[0:1], -1, 0
The resulting encoding is always with neg modifier, in spite that we have
suitable negative inline constants.
Note that in the instructions which have both 32- and 64-bit (VOP3) encodings
that would lead to unnecessary usage of VOP3.
Perhaps we need to introduce explicit syntax form of neg modifier which would
allow to distinguish negative constants from neg modifier applied to constant.
Tested with r273139 (git # 4a94acfea8bfd6eb6b5809dd40f03e1fa42e673a)
GFX7 lit tests attached.
--
You are receiving this mail because:
You are on the CC list for the bug.
_______________________________________________
llvm-bugs mailing list
llvm-bugs@lists.llvm.org
http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-bugs
