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nir/lower_alu: compact bitcount lowering

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while in the area.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35198>
This commit is contained in:
Alyssa Rosenzweig 2025-04-15 12:37:24 -04:00 • committed by Marge Bot
parent 759dc70bde
commit c3fb0645d8
1 changed files with 7 additions and 23 deletions
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30
src/compiler/nir/nir_lower_alu.c
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@ -103,33 +103,17 @@ lower_alu_instr(nir_builder *b, nir_alu_instr *instr, UNUSED void *cb_data)
lowered = nir_ssa_for_alu_src(b, instr, 0);
unsigned bit_size = lowered->bit_size;
nir_def *c1 = nir_imm_int(b, 1);
nir_def *c2 = nir_imm_int(b, 2);
nir_def *c4 = nir_imm_int(b, 4);
nir_def *cshift = nir_imm_int(b, bit_size - 8);
nir_def *c33333333 = nir_imm_intN_t(b, 0x33333333, bit_size);
nir_def *c55555555 = nir_imm_intN_t(b, 0x55555555, bit_size);
nir_def *c0f0f0f0f = nir_imm_intN_t(b, 0x0f0f0f0f, bit_size);
nir_def *c01010101 = nir_imm_intN_t(b, 0x01010101, bit_size);
lowered = nir_isub(b, lowered,
nir_iand(b, nir_ushr(b, lowered, c1), c55555555));
nir_iand_imm(b, nir_ushr_imm(b, lowered, 1), 0x55555555));
lowered = nir_iadd(b,
nir_iand(b, lowered, c33333333),
nir_iand(b, nir_ushr(b, lowered, c2), c33333333));
lowered = nir_iadd(b, nir_iand_imm(b, lowered, 0x33333333),
nir_iand_imm(b, nir_ushr_imm(b, lowered, 2), 0x33333333));
lowered = nir_ushr(b,
nir_imul(b,
nir_iand(b,
nir_iadd(b,
lowered,
nir_ushr(b, lowered, c4)),
c0f0f0f0f),
c01010101),
cshift);
lowered = nir_iadd(b, lowered, nir_ushr_imm(b, lowered, 4));
lowered = nir_u2u32(b, lowered);
lowered = nir_iand_imm(b, lowered, 0x0f0f0f0f);
lowered = nir_imul_imm(b, lowered, 0x01010101);
lowered = nir_u2u32(b, nir_ushr_imm(b, lowered, bit_size - 8));
}
break;