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nir: Add fsin_agx opcode

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Used to split up the fsin/fcos lowering for AGX between NIR and the
backend, to permit algebraic optimizations without polluting NIR with
too many hardware details. The backend NIR lowering produces an
fmul/ffma of the input so we can optimize code like sin(2*x).

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Acked-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10582>
This commit is contained in:
Alyssa Rosenzweig 2021-04-15 22:46:45 -04:00 • committed by Alyssa Rosenzweig
parent e07a2a0f18
commit 0ea67e57e5
1 changed files with 7 additions and 0 deletions
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7
src/compiler/nir/nir_opcodes.py
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@ -1239,6 +1239,13 @@ unop_horiz("cube_r600", 4, tfloat32, 3, tfloat32, """
unop("fsin_r600", tfloat32, "sinf(6.2831853 * src0)")
unop("fcos_r600", tfloat32, "cosf(6.2831853 * src0)")
# AGX specific sin with input expressed in quadrants. Used in the lowering for
# fsin/fcos. This corresponds to a sequence of 3 ALU ops in the backend (where
# the angle is further decomposed by quadrant, sinc is computed, and the angle
# is multiplied back for sin). Lowering fsin/fcos to fsin_agx requires some
# additional ALU that NIR may be able to optimize.
unop("fsin_agx", tfloat, "sinf(src0 * (6.2831853/4.0))")
# 24b multiply into 32b result (with sign extension)
binop("imul24", tint32, _2src_commutative + associative,
"(((int32_t)src0 << 8) >> 8) * (((int32_t)src1 << 8) >> 8)")