[llvm-bugs] [Bug 28244] New: [mc] image_gather4/load/get/sample* -- issues with modifiers, with vgpr_a size etc.

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https://llvm.org/bugs/show_bug.cgi?id=28244

            Bug ID: 28244
           Summary: [mc] image_gather4/load/get/sample* -- issues with
                    modifiers, with vgpr_a size etc.
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: AMDGPU
          Assignee: artem.tamazov at amd.com
          Reporter: artem.tamazov at amd.com
                CC: llvm-bugs at lists.llvm.org, nikolay.haustov at amd.com
    Classification: Unclassified

Created attachment 16620
  --> https://llvm.org/bugs/attachment.cgi?id=16620&action=edit
00123.tests_tg_gfx7_asm_lit1_bug.06.08.min.image_gather_etc-modifiers.zip -
TESTS SHALL BE VERIFIED

Preliminary information on failures (to be verified).

The following ones have problems with some combinations of modifiers:
> image_gather4*
> image_load
> image_load_mip
> image_get_lod
> image_get_resinfo
> image_sample
> image_sample_b
> image_sample_b_cl
> image_sample_c
> image_sample_c_b
> image_sample_c_b_cl
> image_sample_c_cd
> image_sample_c_cl
> image_sample_c_d
> image_sample_c_l
> image_sample_c_lz
> image_sample_cl
> image_sample_l
> image_sample_lz

In the following ones, vgpr_a should have 11 elements while assembler expects
4:
> image_sample_d_cl_o
> image_sample_d_o
> image_sample_cd_cl_o
> image_sample_cd_o
> image_sample_c_d_cl_o
> image_sample_c_d_o
> image_sample_c_cd_cl_o
> image_sample_c_cd_o

Here, vgpr_a should have 10 elements while assembler expects 4:
> image_sample_d
> image_sample_cd
> image_sample_d_cl
> image_sample_cd_cl
> image_sample_c_d_cl
> image_sample_c_cd_cl

Similarly, vgpr_a should have 5 elements while assembler expects 4:
> image_sample_b_cl_o
> image_sample_b_o
> image_sample_c_b_cl_o
> image_sample_c_b_o
> image_sample_c_cl_o
> image_sample_c_l_o
> image_sample_c_lz_o
> image_sample_c_o
> image_sample_cl_o
> image_sample_l_o
> image_sample_lz_o
> image_sample_o

The issue needs to be carefully verified/investigated.

Some GFX7 lit tests attached (both failing and passing ones). These tests are
not guaranteed to be valid, though.

Tested with r273139 (git # 4a94acfea8bfd6eb6b5809dd40f03e1fa42e673a)

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