Mesa (master): freedreno/ir3: Leave bools as 1-bit, storing them in full regs.
GitLab Mirror
gitlab-mirror at kemper.freedesktop.org
Thu Apr 30 23:59:48 UTC 2020
Module: Mesa
Branch: master
Commit: 0e51082cfa733b3b8255bbd77fc4af46f4108c1d
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=0e51082cfa733b3b8255bbd77fc4af46f4108c1d
Author: Eric Anholt <eric at anholt.net>
Date: Thu Apr 9 10:45:24 2020 -0700
freedreno/ir3: Leave bools as 1-bit, storing them in full regs.
If use NIR's 1-bit bool representation , we get exactly the bool behavior
the hardware provides: CMPS produces true or false, AND/OR/XOR work as
intended without extra absnegs, and we can pass those half values directly
to other CMPS. We emit an absneg for b2b1 ("turn a memory load into a
1-bit NIR boolean"), but we would have done so for the ir3_n2b() on the
use of that value anyway. The most awkward bit is that inot(a at 1) is now a
sub(1, a), but we can encode the 1 as an immediate so it's fine.
No significant changes to GL_TIME_ELAPSED on my set of traces (n=21).
instructions in affected programs: 1570638 -> 1548702 (-1.40%)
nops in affected programs: 624053 -> 611381 (-2.03%)
non-nops in affected programs: 959061 -> 949797 (-0.97%)
mov in affected programs: 5258 -> 5252 (-0.11%)
cov in affected programs: 15099 -> 15902 (5.32%)
dwords in affected programs: 469600 -> 452768 (-3.58%)
last-baryf in affected programs: 162211 -> 154726 (-4.61%)
full in affected programs: 4881 -> 4797 (-1.72%)
sstall in affected programs: 173953 -> 174545 (0.34%)
(ss) in affected programs: 10922 -> 10934 (0.11%)
(sy) in affected programs: 728 -> 745 (2.34%)
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4518>
---
src/freedreno/ir3/ir3_compiler_nir.c | 224 +++++++++++++++++------------------
src/freedreno/ir3/ir3_context.c | 6 +-
2 files changed, 111 insertions(+), 119 deletions(-)
diff --git a/src/freedreno/ir3/ir3_compiler_nir.c b/src/freedreno/ir3/ir3_compiler_nir.c
index 2027fb88c7d..5f55596bb63 100644
--- a/src/freedreno/ir3/ir3_compiler_nir.c
+++ b/src/freedreno/ir3/ir3_compiler_nir.c
@@ -107,48 +107,13 @@ create_driver_param(struct ir3_context *ctx, enum ir3_driver_param dp)
}
/*
- * Adreno uses uint rather than having dedicated bool type,
- * which (potentially) requires some conversion, in particular
- * when using output of an bool instr to int input, or visa
- * versa.
- *
- * | Adreno | NIR |
- * -------+---------+-------+-
- * true | 1 | ~0 |
- * false | 0 | 0 |
- *
- * To convert from an adreno bool (uint) to nir, use:
- *
- * absneg.s dst, (neg)src
- *
- * To convert back in the other direction:
- *
- * absneg.s dst, (abs)arc
- *
- * The CP step can clean up the absneg.s that cancel each other
- * out, and with a slight bit of extra cleverness (to recognize
- * the instructions which produce either a 0 or 1) can eliminate
- * the absneg.s's completely when an instruction that wants
- * 0/1 consumes the result. For example, when a nir 'bcsel'
- * consumes the result of 'feq'. So we should be able to get by
- * without a boolean resolve step, and without incuring any
- * extra penalty in instruction count.
+ * Adreno's comparisons produce a 1 for true and 0 for false, in either 16 or
+ * 32-bit registers. We use NIR's 1-bit integers to represent bools, and
+ * trust that we will only see and/or/xor on those 1-bit values, so we can
+ * safely store NIR i1s in a 32-bit reg while always containing either a 1 or
+ * 0.
*/
-/* NIR bool -> native (adreno): */
-static struct ir3_instruction *
-ir3_b2n(struct ir3_block *block, struct ir3_instruction *instr)
-{
- return ir3_ABSNEG_S(block, instr, IR3_REG_SABS);
-}
-
-/* native (adreno) -> NIR bool: */
-static struct ir3_instruction *
-ir3_n2b(struct ir3_block *block, struct ir3_instruction *instr)
-{
- return ir3_ABSNEG_S(block, instr, IR3_REG_SNEG);
-}
-
/*
* alu/sfu instructions:
*/
@@ -222,6 +187,14 @@ create_cov(struct ir3_context *ctx, struct ir3_instruction *src,
}
break;
+ case nir_op_b2f16:
+ case nir_op_b2f32:
+ case nir_op_b2i8:
+ case nir_op_b2i16:
+ case nir_op_b2i32:
+ src_type = TYPE_U32;
+ break;
+
default:
ir3_context_error(ctx, "invalid conversion op: %u", op);
}
@@ -230,6 +203,7 @@ create_cov(struct ir3_context *ctx, struct ir3_instruction *src,
case nir_op_f2f32:
case nir_op_i2f32:
case nir_op_u2f32:
+ case nir_op_b2f32:
dst_type = TYPE_F32;
break;
@@ -238,21 +212,25 @@ create_cov(struct ir3_context *ctx, struct ir3_instruction *src,
case nir_op_f2f16:
case nir_op_i2f16:
case nir_op_u2f16:
+ case nir_op_b2f16:
dst_type = TYPE_F16;
break;
case nir_op_f2i32:
case nir_op_i2i32:
+ case nir_op_b2i32:
dst_type = TYPE_S32;
break;
case nir_op_f2i16:
case nir_op_i2i16:
+ case nir_op_b2i16:
dst_type = TYPE_S16;
break;
case nir_op_f2i8:
case nir_op_i2i8:
+ case nir_op_b2i8:
dst_type = TYPE_S8;
break;
@@ -275,6 +253,9 @@ create_cov(struct ir3_context *ctx, struct ir3_instruction *src,
ir3_context_error(ctx, "invalid conversion op: %u", op);
}
+ if (src_type == dst_type)
+ return src;
+
struct ir3_instruction *cov =
ir3_COV(ctx->block, src, src_type, dst_type);
@@ -292,7 +273,7 @@ emit_alu(struct ir3_context *ctx, nir_alu_instr *alu)
unsigned bs[info->num_inputs]; /* bit size */
struct ir3_block *b = ctx->block;
unsigned dst_sz, wrmask;
- type_t dst_type = nir_dest_bit_size(alu->dest.dest) < 32 ?
+ type_t dst_type = nir_dest_bit_size(alu->dest.dest) == 16 ?
TYPE_U16 : TYPE_U32;
if (alu->dest.dest.is_ssa) {
@@ -383,43 +364,52 @@ emit_alu(struct ir3_context *ctx, nir_alu_instr *alu)
case nir_op_u2u32:
case nir_op_u2u16:
case nir_op_u2u8:
+ case nir_op_b2f16:
+ case nir_op_b2f32:
+ case nir_op_b2i8:
+ case nir_op_b2i16:
+ case nir_op_b2i32:
dst[0] = create_cov(ctx, src[0], bs[0], alu->op);
break;
+
case nir_op_fquantize2f16:
dst[0] = create_cov(ctx,
create_cov(ctx, src[0], 32, nir_op_f2f16),
16, nir_op_f2f32);
break;
- case nir_op_f2b16: {
- struct ir3_instruction *zero = create_immed_typed(b, 0, TYPE_F16);
- dst[0] = ir3_CMPS_F(b, src[0], 0, zero, 0);
+ case nir_op_f2b1:
+ dst[0] = ir3_CMPS_F(b,
+ src[0], 0,
+ create_immed_typed(b, 0, bs[0] == 16 ? TYPE_F16 : TYPE_F32), 0);
dst[0]->cat2.condition = IR3_COND_NE;
break;
- }
- case nir_op_f2b32:
- dst[0] = ir3_CMPS_F(b, src[0], 0, create_immed(b, fui(0.0)), 0);
+
+ case nir_op_i2b1:
+ /* i2b1 will appear when translating from nir_load_ubo or
+ * nir_intrinsic_load_ssbo, where any non-zero value is true.
+ */
+ dst[0] = ir3_CMPS_S(b, src[0], 0, create_immed(b, 0), 0);
dst[0]->cat2.condition = IR3_COND_NE;
break;
- case nir_op_b2f16:
- dst[0] = ir3_COV(b, ir3_b2n(b, src[0]), TYPE_U32, TYPE_F16);
- break;
- case nir_op_b2f32:
- dst[0] = ir3_COV(b, ir3_b2n(b, src[0]), TYPE_U32, TYPE_F32);
- break;
- case nir_op_b2i8:
- case nir_op_b2i16:
- case nir_op_b2i32:
- dst[0] = ir3_b2n(b, src[0]);
- break;
- case nir_op_i2b16: {
- struct ir3_instruction *zero = create_immed_typed(b, 0, TYPE_S16);
- dst[0] = ir3_CMPS_S(b, src[0], 0, zero, 0);
- dst[0]->cat2.condition = IR3_COND_NE;
+
+ case nir_op_b2b1:
+ /* b2b1 will appear when translating from
+ *
+ * - nir_intrinsic_load_shared of a 32-bit 0/~0 value.
+ * - nir_intrinsic_load_constant of a 32-bit 0/~0 value
+ *
+ * A negate can turn those into a 1 or 0 for us.
+ */
+ dst[0] = ir3_ABSNEG_S(b, src[0], IR3_REG_SNEG);
break;
- }
- case nir_op_i2b32:
- dst[0] = ir3_CMPS_S(b, src[0], 0, create_immed(b, 0), 0);
- dst[0]->cat2.condition = IR3_COND_NE;
+
+ case nir_op_b2b32:
+ /* b2b32 will appear when converting our 1-bit bools to a store_shared
+ * argument.
+ *
+ * A negate can turn those into a ~0 for us.
+ */
+ dst[0] = ir3_ABSNEG_S(b, src[0], IR3_REG_SNEG);
break;
case nir_op_fneg:
@@ -486,23 +476,19 @@ emit_alu(struct ir3_context *ctx, nir_alu_instr *alu)
dst[0] = ir3_DSYPP_1(b, src[0], 0);
dst[0]->cat5.type = TYPE_F32;
break;
- case nir_op_flt16:
- case nir_op_flt32:
+ case nir_op_flt:
dst[0] = ir3_CMPS_F(b, src[0], 0, src[1], 0);
dst[0]->cat2.condition = IR3_COND_LT;
break;
- case nir_op_fge16:
- case nir_op_fge32:
+ case nir_op_fge:
dst[0] = ir3_CMPS_F(b, src[0], 0, src[1], 0);
dst[0]->cat2.condition = IR3_COND_GE;
break;
- case nir_op_feq16:
- case nir_op_feq32:
+ case nir_op_feq:
dst[0] = ir3_CMPS_F(b, src[0], 0, src[1], 0);
dst[0]->cat2.condition = IR3_COND_EQ;
break;
- case nir_op_fne16:
- case nir_op_fne32:
+ case nir_op_fne:
dst[0] = ir3_CMPS_F(b, src[0], 0, src[1], 0);
dst[0]->cat2.condition = IR3_COND_NE;
break;
@@ -581,7 +567,11 @@ emit_alu(struct ir3_context *ctx, nir_alu_instr *alu)
dst[0] = ir3_ABSNEG_S(b, src[0], IR3_REG_SNEG);
break;
case nir_op_inot:
- dst[0] = ir3_NOT_B(b, src[0], 0);
+ if (bs[0] == 1) {
+ dst[0] = ir3_SUB_U(b, create_immed(ctx->block, 1), 0, src[0], 0);
+ } else {
+ dst[0] = ir3_NOT_B(b, src[0], 0);
+ }
break;
case nir_op_ior:
dst[0] = ir3_OR_B(b, src[0], 0, src[1], 0);
@@ -601,39 +591,32 @@ emit_alu(struct ir3_context *ctx, nir_alu_instr *alu)
case nir_op_ushr:
dst[0] = ir3_SHR_B(b, src[0], 0, src[1], 0);
break;
- case nir_op_ilt16:
- case nir_op_ilt32:
+ case nir_op_ilt:
dst[0] = ir3_CMPS_S(b, src[0], 0, src[1], 0);
dst[0]->cat2.condition = IR3_COND_LT;
break;
- case nir_op_ige16:
- case nir_op_ige32:
+ case nir_op_ige:
dst[0] = ir3_CMPS_S(b, src[0], 0, src[1], 0);
dst[0]->cat2.condition = IR3_COND_GE;
break;
- case nir_op_ieq16:
- case nir_op_ieq32:
+ case nir_op_ieq:
dst[0] = ir3_CMPS_S(b, src[0], 0, src[1], 0);
dst[0]->cat2.condition = IR3_COND_EQ;
break;
- case nir_op_ine16:
- case nir_op_ine32:
+ case nir_op_ine:
dst[0] = ir3_CMPS_S(b, src[0], 0, src[1], 0);
dst[0]->cat2.condition = IR3_COND_NE;
break;
- case nir_op_ult16:
- case nir_op_ult32:
+ case nir_op_ult:
dst[0] = ir3_CMPS_U(b, src[0], 0, src[1], 0);
dst[0]->cat2.condition = IR3_COND_LT;
break;
- case nir_op_uge16:
- case nir_op_uge32:
+ case nir_op_uge:
dst[0] = ir3_CMPS_U(b, src[0], 0, src[1], 0);
dst[0]->cat2.condition = IR3_COND_GE;
break;
- case nir_op_b16csel:
- case nir_op_b32csel: {
+ case nir_op_bcsel: {
struct ir3_instruction *cond = src[0];
/* If src[0] is a negation (likely as a result of an ir3_b2n(cond)),
@@ -647,24 +630,21 @@ emit_alu(struct ir3_context *ctx, nir_alu_instr *alu)
}
compile_assert(ctx, bs[1] == bs[2]);
- if (bs[1] != bs[0]) {
+ /* The condition's size has to match the other two arguments' size, so
+ * convert down if necessary.
+ */
+ if (bs[1] == 16) {
struct hash_entry *prev_entry =
_mesa_hash_table_search(ctx->sel_cond_conversions, src[0]);
if (prev_entry) {
cond = prev_entry->data;
} else {
- /* Make sure the boolean condition has the same bit size as the other
- * two arguments, adding a conversion if necessary.
- */
- if (bs[1] < bs[0])
- cond = ir3_COV(b, cond, TYPE_U32, TYPE_U16);
- else if (bs[1] > bs[0])
- cond = ir3_COV(b, cond, TYPE_U16, TYPE_U32);
+ cond = ir3_COV(b, cond, TYPE_U32, TYPE_U16);
_mesa_hash_table_insert(ctx->sel_cond_conversions, src[0], cond);
}
}
- if (bs[1] > 16)
+ if (bs[1] != 16)
dst[0] = ir3_SEL_B32(b, src[1], 0, cond, 0, src[2], 0);
else
dst[0] = ir3_SEL_B16(b, src[1], 0, cond, 0, src[2], 0);
@@ -725,12 +705,23 @@ emit_alu(struct ir3_context *ctx, nir_alu_instr *alu)
}
if (nir_alu_type_get_base_type(info->output_type) == nir_type_bool) {
+ assert(nir_dest_bit_size(alu->dest.dest) == 1 ||
+ alu->op == nir_op_b2b32);
assert(dst_sz == 1);
-
- if (nir_dest_bit_size(alu->dest.dest) < 32)
- dst[0]->regs[0]->flags |= IR3_REG_HALF;
-
- dst[0] = ir3_n2b(b, dst[0]);
+ } else {
+ /* 1-bit values stored in 32-bit registers are only valid for certain
+ * ALU ops.
+ */
+ switch (alu->op) {
+ case nir_op_iand:
+ case nir_op_ior:
+ case nir_op_ixor:
+ case nir_op_inot:
+ case nir_op_bcsel:
+ break;
+ default:
+ compile_assert(ctx, nir_dest_bit_size(alu->dest.dest) != 1);
+ }
}
ir3_put_dst(ctx, &alu->dest.dest);
@@ -1218,7 +1209,7 @@ emit_intrinsic_image_size(struct ir3_context *ctx, nir_intrinsic_instr *intr,
struct tex_src_info info = get_image_samp_tex_src(ctx, intr);
struct ir3_instruction *sam, *lod;
unsigned flags, ncoords = ir3_get_image_coords(intr, &flags);
- type_t dst_type = nir_dest_bit_size(intr->dest) < 32 ?
+ type_t dst_type = nir_dest_bit_size(intr->dest) == 16 ?
TYPE_U16 : TYPE_U32;
info.flags |= flags;
@@ -1477,7 +1468,7 @@ emit_intrinsic(struct ir3_context *ctx, nir_intrinsic_instr *intr)
idx += nir_src_as_uint(intr->src[0]);
for (int i = 0; i < intr->num_components; i++) {
dst[i] = create_uniform_typed(b, idx + i,
- nir_dest_bit_size(intr->dest) < 32 ? TYPE_F16 : TYPE_F32);
+ nir_dest_bit_size(intr->dest) == 16 ? TYPE_F16 : TYPE_F32);
}
} else {
src = ir3_get_src(ctx, &intr->src[0]);
@@ -1868,8 +1859,10 @@ emit_intrinsic(struct ir3_context *ctx, nir_intrinsic_instr *intr)
/* for fragface, we get -1 for back and 0 for front. However this is
* the inverse of what nir expects (where ~0 is true).
*/
- dst[0] = ir3_COV(b, ctx->frag_face, TYPE_S16, TYPE_S32);
- dst[0] = ir3_NOT_B(b, dst[0], 0);
+ dst[0] = ir3_CMPS_S(b,
+ ctx->frag_face, 0,
+ create_immed_typed(b, 0, TYPE_U16), 0);
+ dst[0]->cat2.condition = IR3_COND_EQ;
break;
case nir_intrinsic_load_local_invocation_id:
if (!ctx->local_invocation_id) {
@@ -1903,7 +1896,7 @@ emit_intrinsic(struct ir3_context *ctx, nir_intrinsic_instr *intr)
if (intr->intrinsic == nir_intrinsic_discard_if) {
/* conditional discard: */
src = ir3_get_src(ctx, &intr->src[0]);
- cond = ir3_b2n(b, src[0]);
+ cond = src[0];
} else {
/* unconditional discard: */
cond = create_immed(b, 1);
@@ -1931,7 +1924,7 @@ emit_intrinsic(struct ir3_context *ctx, nir_intrinsic_instr *intr)
struct ir3_instruction *cond, *kill;
src = ir3_get_src(ctx, &intr->src[0]);
- cond = ir3_b2n(b, src[0]);
+ cond = src[0];
/* NOTE: only cmps.*.* can write p0.x: */
cond = ir3_CMPS_S(b, cond, 0, create_immed(b, 0), 0);
@@ -1975,7 +1968,7 @@ emit_load_const(struct ir3_context *ctx, nir_load_const_instr *instr)
struct ir3_instruction **dst = ir3_get_dst_ssa(ctx, &instr->def,
instr->def.num_components);
- if (instr->def.bit_size < 32) {
+ if (instr->def.bit_size == 16) {
for (int i = 0; i < instr->def.num_components; i++)
dst[i] = create_immed_typed(ctx->block,
instr->value[i].u16,
@@ -1994,7 +1987,7 @@ emit_undef(struct ir3_context *ctx, nir_ssa_undef_instr *undef)
{
struct ir3_instruction **dst = ir3_get_dst_ssa(ctx, &undef->def,
undef->def.num_components);
- type_t type = (undef->def.bit_size < 32) ? TYPE_U16 : TYPE_U32;
+ type_t type = (undef->def.bit_size == 16) ? TYPE_U16 : TYPE_U32;
/* backend doesn't want undefined instructions, so just plug
* in 0.0..
@@ -2015,14 +2008,14 @@ get_tex_dest_type(nir_tex_instr *tex)
switch (nir_alu_type_get_base_type(tex->dest_type)) {
case nir_type_invalid:
case nir_type_float:
- type = nir_dest_bit_size(tex->dest) < 32 ? TYPE_F16 : TYPE_F32;
+ type = nir_dest_bit_size(tex->dest) == 16 ? TYPE_F16 : TYPE_F32;
break;
case nir_type_int:
- type = nir_dest_bit_size(tex->dest) < 32 ? TYPE_S16 : TYPE_S32;
+ type = nir_dest_bit_size(tex->dest) == 16 ? TYPE_S16 : TYPE_S32;
break;
case nir_type_uint:
case nir_type_bool:
- type = nir_dest_bit_size(tex->dest) < 32 ? TYPE_U16 : TYPE_U32;
+ type = nir_dest_bit_size(tex->dest) == 16 ? TYPE_U16 : TYPE_U32;
break;
default:
unreachable("bad dest_type");
@@ -2701,8 +2694,7 @@ emit_if(struct ir3_context *ctx, nir_if *nif)
{
struct ir3_instruction *condition = ir3_get_src(ctx, &nif->condition)[0];
- ctx->block->condition =
- ir3_get_predicate(ctx, ir3_b2n(condition->block, condition));
+ ctx->block->condition = ir3_get_predicate(ctx, condition);
emit_cf_list(ctx, &nif->then_list);
emit_cf_list(ctx, &nif->else_list);
diff --git a/src/freedreno/ir3/ir3_context.c b/src/freedreno/ir3/ir3_context.c
index f4511ec77da..38f870321a7 100644
--- a/src/freedreno/ir3/ir3_context.c
+++ b/src/freedreno/ir3/ir3_context.c
@@ -80,7 +80,6 @@ ir3_context_init(struct ir3_compiler *compiler,
/* this needs to be the last pass run, so do this here instead of
* in ir3_optimize_nir():
*/
- NIR_PASS_V(ctx->s, nir_lower_bool_to_bitsize);
bool progress = false;
NIR_PASS(progress, ctx->s, nir_lower_locals_to_regs);
@@ -216,7 +215,8 @@ ir3_put_dst(struct ir3_context *ctx, nir_dest *dst)
}
}
- if (bit_size < 32) {
+ /* Note: 1-bit bools are stored in 32-bit regs */
+ if (bit_size == 16) {
for (unsigned i = 0; i < ctx->last_dst_n; i++) {
struct ir3_instruction *dst = ctx->last_dst[i];
dst->regs[0]->flags |= IR3_REG_HALF;
@@ -556,7 +556,7 @@ ir3_create_array_load(struct ir3_context *ctx, struct ir3_array *arr, int n,
unsigned flags = 0;
mov = ir3_instr_create(block, OPC_MOV);
- if (bitsize < 32) {
+ if (bitsize == 16) {
mov->cat1.src_type = TYPE_U16;
mov->cat1.dst_type = TYPE_U16;
flags |= IR3_REG_HALF;
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