The mechanics of this opcode are a little opaque, but essentially, it's
used in 8-bit mode to do a bit count in parallel of a uint and then
doing a ton of clever iadd/imov ops to recombine.
Signed-off-by: Alyssa Rosenzweig <aly...@rosenzweig.io>
---
src/gallium/drivers/panfrost/midgard/helpers.h | 1 +
src/gallium/drivers/panfrost/midgard/midgard.h | 2 ++
2 files changed, 3 insertions(+)
diff --git a/src/gallium/drivers/panfrost/midgard/helpers.h
b/src/gallium/drivers/panfrost/midgard/helpers.h
index 6cb00a58d68..4c2be223186 100644
--- a/src/gallium/drivers/panfrost/midgard/helpers.h
+++ b/src/gallium/drivers/panfrost/midgard/helpers.h
@@ -254,6 +254,7 @@ static unsigned alu_opcode_props[256] = {
[midgard_alu_op_ior] = UNITS_ADD,
[midgard_alu_op_ixor] = UNITS_ADD,
[midgard_alu_op_ilzcnt] = UNITS_ADD,
+ [midgard_alu_op_ibitcount8] = UNITS_ADD,
[midgard_alu_op_inot] = UNITS_MOST,
[midgard_alu_op_ishl] = UNITS_ADD,
[midgard_alu_op_iasr] = UNITS_ADD,
diff --git a/src/gallium/drivers/panfrost/midgard/midgard.h
b/src/gallium/drivers/panfrost/midgard/midgard.h
index 2698a2b9bc6..cc32b07970e 100644
--- a/src/gallium/drivers/panfrost/midgard/midgard.h
+++ b/src/gallium/drivers/panfrost/midgard/midgard.h
@@ -86,6 +86,7 @@ typedef enum {
midgard_alu_op_iandnot = 0x74, /* (a, b) -> a & ~b, used for
not/b2f */
midgard_alu_op_ixor = 0x76,
midgard_alu_op_ilzcnt = 0x78, /* Number of zeroes on left. 31 -
ilzcnt(x) = findMSB(x) */
+ midgard_alu_op_ibitcount8 = 0x7B, /* Counts bits in 8-bit increments */
midgard_alu_op_imov = 0x7B,
midgard_alu_op_iabs = 0x7C,
midgard_alu_op_feq = 0x80,
@@ -501,6 +502,7 @@ static char *alu_opcode_names[256] = {
[midgard_alu_op_iandnot] = "iandnot",
[midgard_alu_op_ixor] = "ixor",
[midgard_alu_op_ilzcnt] = "ilzcnt",
+ [midgard_alu_op_ibitcount8] = "ibitcount8",
[midgard_alu_op_feq] = "feq",
[midgard_alu_op_fne] = "fne",
[midgard_alu_op_flt] = "flt",
--
2.20.1
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