We already had a channel_num system value, which I'm renaming to
subgroup_invocation to match the rest of the new system values.
Note that while ballotARB(true) will return zeros in the high 32-bits on
systems where gl_SubGroupSizeARB <= 32, the gl_SubGroup??MaskARB
variables do not consider whether channels are enabled. See issue (1) of
ARB_shader_ballot.
---
src/compiler/nir/nir.c | 4 ++++
src/compiler/nir/nir_intrinsics.h | 8 +++++++-
src/compiler/nir/nir_lower_system_values.c | 28 ++++++++++++++++++++++++++++
src/intel/compiler/brw_fs_nir.cpp | 2 +-
src/intel/compiler/brw_nir_intrinsics.c | 4 ++--
5 files changed, 42 insertions(+), 4 deletions(-)
diff --git a/src/compiler/nir/nir.c b/src/compiler/nir/nir.c
index 491b908396..9827e129ca 100644
--- a/src/compiler/nir/nir.c
+++ b/src/compiler/nir/nir.c
@@ -1908,6 +1908,10 @@ nir_intrinsic_from_system_value(gl_system_value val)
return nir_intrinsic_load_helper_invocation;
case SYSTEM_VALUE_VIEW_INDEX:
return nir_intrinsic_load_view_index;
+ case SYSTEM_VALUE_SUBGROUP_SIZE:
+ return nir_intrinsic_load_subgroup_size;
+ case SYSTEM_VALUE_SUBGROUP_INVOCATION:
+ return nir_intrinsic_load_subgroup_invocation;
default:
unreachable("system value does not directly correspond to intrinsic");
}
diff --git a/src/compiler/nir/nir_intrinsics.h
b/src/compiler/nir/nir_intrinsics.h
index 6c6ba4cf59..96ecfbc338 100644
--- a/src/compiler/nir/nir_intrinsics.h
+++ b/src/compiler/nir/nir_intrinsics.h
@@ -344,10 +344,16 @@ SYSTEM_VALUE(work_group_id, 3, 0, xx, xx, xx)
SYSTEM_VALUE(user_clip_plane, 4, 1, UCP_ID, xx, xx)
SYSTEM_VALUE(num_work_groups, 3, 0, xx, xx, xx)
SYSTEM_VALUE(helper_invocation, 1, 0, xx, xx, xx)
-SYSTEM_VALUE(channel_num, 1, 0, xx, xx, xx)
SYSTEM_VALUE(alpha_ref_float, 1, 0, xx, xx, xx)
SYSTEM_VALUE(layer_id, 1, 0, xx, xx, xx)
SYSTEM_VALUE(view_index, 1, 0, xx, xx, xx)
+SYSTEM_VALUE(subgroup_size, 1, 0, xx, xx, xx)
+SYSTEM_VALUE(subgroup_invocation, 1, 0, xx, xx, xx)
+SYSTEM_VALUE(subgroup_eq_mask, 1, 0, xx, xx, xx)
+SYSTEM_VALUE(subgroup_ge_mask, 1, 0, xx, xx, xx)
+SYSTEM_VALUE(subgroup_gt_mask, 1, 0, xx, xx, xx)
+SYSTEM_VALUE(subgroup_le_mask, 1, 0, xx, xx, xx)
+SYSTEM_VALUE(subgroup_lt_mask, 1, 0, xx, xx, xx)
/* Blend constant color values. Float values are clamped. */
SYSTEM_VALUE(blend_const_color_r_float, 1, 0, xx, xx, xx)
diff --git a/src/compiler/nir/nir_lower_system_values.c
b/src/compiler/nir/nir_lower_system_values.c
index 810100a081..faf0c3c9da 100644
--- a/src/compiler/nir/nir_lower_system_values.c
+++ b/src/compiler/nir/nir_lower_system_values.c
@@ -116,6 +116,34 @@ convert_block(nir_block *block, nir_builder *b)
nir_load_base_instance(b));
break;
+ case SYSTEM_VALUE_SUBGROUP_EQ_MASK:
+ case SYSTEM_VALUE_SUBGROUP_GE_MASK:
+ case SYSTEM_VALUE_SUBGROUP_GT_MASK:
+ case SYSTEM_VALUE_SUBGROUP_LE_MASK:
+ case SYSTEM_VALUE_SUBGROUP_LT_MASK: {
+ nir_ssa_def *count = nir_load_subgroup_invocation(b);
+
+ switch (var->data.location) {
+ case SYSTEM_VALUE_SUBGROUP_EQ_MASK:
+ sysval = nir_ishl(b, nir_imm_int64(b, 1ull), count);
+ break;
+ case SYSTEM_VALUE_SUBGROUP_GE_MASK:
+ sysval = nir_ishl(b, nir_imm_int64(b, ~0ull), count);
+ break;
+ case SYSTEM_VALUE_SUBGROUP_GT_MASK:
+ sysval = nir_ishl(b, nir_imm_int64(b, ~1ull), count);
+ break;
+ case SYSTEM_VALUE_SUBGROUP_LE_MASK:
+ sysval = nir_inot(b, nir_ishl(b, nir_imm_int64(b, ~1ull), count));
+ break;
+ case SYSTEM_VALUE_SUBGROUP_LT_MASK:
+ sysval = nir_inot(b, nir_ishl(b, nir_imm_int64(b, ~0ull), count));
+ break;
+ default:
+ unreachable("you seriously can't tell this is unreachable?");
+ }
+ }
+
default:
break;
}
diff --git a/src/intel/compiler/brw_fs_nir.cpp
b/src/intel/compiler/brw_fs_nir.cpp
index 264398f38e..17f35e081d 100644
--- a/src/intel/compiler/brw_fs_nir.cpp
+++ b/src/intel/compiler/brw_fs_nir.cpp
@@ -4075,7 +4075,7 @@ fs_visitor::nir_emit_intrinsic(const fs_builder &bld,
nir_intrinsic_instr *instr
break;
}
- case nir_intrinsic_load_channel_num: {
+ case nir_intrinsic_load_subgroup_invocation: {
fs_reg tmp = bld.vgrf(BRW_REGISTER_TYPE_UW);
dest = retype(dest, BRW_REGISTER_TYPE_UD);
const fs_builder allbld8 = bld.group(8, 0).exec_all();
diff --git a/src/intel/compiler/brw_nir_intrinsics.c
b/src/intel/compiler/brw_nir_intrinsics.c
index d63570fa2a..abbbc6f93e 100644
--- a/src/intel/compiler/brw_nir_intrinsics.c
+++ b/src/intel/compiler/brw_nir_intrinsics.c
@@ -88,10 +88,10 @@ lower_cs_intrinsics_convert_block(struct
lower_intrinsics_state *state,
/* We construct the local invocation index from:
*
* gl_LocalInvocationIndex =
- * cs_thread_local_id + channel_num;
+ * cs_thread_local_id + subgroup_invocation;
*/
nir_ssa_def *thread_local_id = read_thread_local_id(state);
- nir_ssa_def *channel = nir_load_channel_num(b);
+ nir_ssa_def *channel = nir_load_subgroup_invocation(b);
sysval = nir_iadd(b, channel, thread_local_id);
break;
}
--
2.13.0
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