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nir: Add a new ALU nir_op_imad24_ir3 

ir3 compiler has a signed integer multiply-add instruction (MAD_S24)
that is used for different offset calculations in the backend.
Since we intend to move some of these calculations to NIR, we need
a new ALU op that can directly represent it.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Acked-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Reviewed-by: Eduardo Lima Mitev <elima@igalia.com>
This commit is contained in:
Eduardo Lima Mitev 2019-06-28 09:39:38 +02:00 committed by Rob Clark
parent 6ad442acae
commit 32e5fbf47c
1 changed files with 7 additions and 0 deletions
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7
src/compiler/nir/nir_opcodes.py
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@ -1054,3 +1054,10 @@ opcode("imadsh_mix16", 1, tint32,
[1, 1, 1], [tint32, tint32, tint32], False, "", """
dst.x = ((((src0.x & 0xffff0000) >> 16) * (src1.x & 0x0000ffff)) << 16) + src2.x;
""")
# ir3-specific instruction that maps directly to ir3 mad.s24.
#
# 24b multiply into 32b result (with sign extension) plus 32b int
triop("imad24_ir3", tint32, _2src_commutative,
"(((int32_t)src0 << 8) >> 8) * (((int32_t)src1 << 8) >> 8) + src2")