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| author | Timur Kristóf <timur.kristof@gmail.com> | 2021-08-31 20:00:16 +0200 |
|---|---|---|
| committer | Marge Bot <eric+marge@anholt.net> | 2021-09-01 08:42:03 +0000 |
| commit | 33630090a21f63d2106d8985abffeb7e72375278 (patch) | |
| tree | d77c0f91c67ce6fa38f17d2b1de218cb926fa3fe /src/compiler/nir/nir_opcodes.py | |
| parent | 77a852c1baff8b25078b8efbcd7674e140beea2c (diff) | |
| download | mesa-33630090a21f63d2106d8985abffeb7e72375278.tar.gz | |
nir: Add comment to explain the sad_u8x4 opcode.
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12649>
Diffstat (limited to 'src/compiler/nir/nir_opcodes.py')
| -rw-r--r-- | src/compiler/nir/nir_opcodes.py | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_opcodes.py b/src/compiler/nir/nir_opcodes.py index a46ff8f41e7..af32edda067 100644 --- a/src/compiler/nir/nir_opcodes.py +++ b/src/compiler/nir/nir_opcodes.py @@ -1060,6 +1060,11 @@ if (bits == 0) { } """) +# Sum of absolute differences with accumulation. +# (Equivalent to AMD's v_sad_u8 instruction.) +# The first two sources contain packed 8-bit unsigned integers, the instruction +# will calculate the absolute difference of these, and then add them together. +# There is also a third source which is a 32-bit unsigned integer and added to the result. triop_horiz("sad_u8x4", 1, 1, 1, 1, """ uint8_t s0_b0 = (src0.x & 0x000000ff) >> 0; uint8_t s0_b1 = (src0.x & 0x0000ff00) >> 8; |