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pan/bi: Try to reuse constants in ALU

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Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4615>
This commit is contained in:
Alyssa Rosenzweig 2020-04-15 10:39:42 -04:00
parent aba7f09902
commit d772bf0101
1 changed files with 11 additions and 2 deletions
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13
src/panfrost/bifrost/bifrost_compile.c
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@ -483,9 +483,18 @@ bi_copy_src(bi_instruction *alu, nir_alu_instr *instr, unsigned i, unsigned to,
/* Try to inline a constant */
if (nir_src_is_const(instr->src[i].src) && *constants_left && (dest_bits == bits)) {
alu->constant.u64 |=
(nir_src_as_uint(instr->src[i].src)) << *constant_shift;
uint64_t mask = (1ull << dest_bits) - 1;
uint64_t cons = nir_src_as_uint(instr->src[i].src);
/* Try to reuse a constant */
for (unsigned i = 0; i < (*constant_shift); i += dest_bits) {
if (((alu->constant.u64 >> i) & mask) == cons) {
alu->src[to] = BIR_INDEX_CONSTANT | i;
return;
}
}
alu->constant.u64 |= cons << *constant_shift;
alu->src[to] = BIR_INDEX_CONSTANT | (*constant_shift);
--(*constants_left);
(*constant_shift) += dest_bits;