From: Dave Airlie <airl...@redhat.com>
Looking at some Talos shaders vs radeonsi, I noticed they use
tex_lz in a few places, so we should be able to as well.
Signed-off-by: Dave Airlie <airl...@redhat.com>
---
src/amd/common/ac_nir_to_llvm.c | 22 ++++++++++++++++------
1 file changed, 16 insertions(+), 6 deletions(-)
diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
index 6062d3a..514c9e9 100644
--- a/src/amd/common/ac_nir_to_llvm.c
+++ b/src/amd/common/ac_nir_to_llvm.c
@@ -2049,6 +2049,7 @@ static LLVMValueRef radv_lower_gather4_integer(struct
nir_to_llvm_context *ctx,
static LLVMValueRef build_tex_intrinsic(struct nir_to_llvm_context *ctx,
nir_tex_instr *instr,
+ bool lod_is_zero,
struct ac_image_args *args)
{
if (instr->sampler_dim == GLSL_SAMPLER_DIM_BUF) {
@@ -2074,7 +2075,10 @@ static LLVMValueRef build_tex_intrinsic(struct
nir_to_llvm_context *ctx,
args->bias = true;
break;
case nir_texop_txl:
- args->lod = true;
+ if (lod_is_zero)
+ args->level_zero = true;
+ else
+ args->lod = true;
break;
case nir_texop_txs:
case nir_texop_query_levels:
@@ -4203,7 +4207,7 @@ static void visit_tex(struct nir_to_llvm_context *ctx,
nir_tex_instr *instr)
LLVMValueRef derivs[6];
unsigned chan, count = 0;
unsigned const_src = 0, num_deriv_comp = 0;
-
+ bool lod_is_zero = false;
tex_fetch_ptrs(ctx, instr, &res_ptr, &samp_ptr, &fmask_ptr);
for (unsigned i = 0; i < instr->num_srcs; i++) {
@@ -4223,9 +4227,14 @@ static void visit_tex(struct nir_to_llvm_context *ctx,
nir_tex_instr *instr)
case nir_tex_src_bias:
bias = get_src(ctx, instr->src[i].src);
break;
- case nir_tex_src_lod:
+ case nir_tex_src_lod: {
+ nir_const_value *val =
nir_src_as_const_value(instr->src[i].src);
+
+ if (val && val->i32[0] == 0)
+ lod_is_zero = true;
lod = get_src(ctx, instr->src[i].src);
break;
+ }
case nir_tex_src_ms_index:
sample_index = get_src(ctx, instr->src[i].src);
break;
@@ -4370,7 +4379,8 @@ static void visit_tex(struct nir_to_llvm_context *ctx,
nir_tex_instr *instr)
}
/* Pack LOD */
- if ((instr->op == nir_texop_txl || instr->op == nir_texop_txf) && lod) {
+ if (lod && ((instr->op == nir_texop_txl && !lod_is_zero) ||
+ instr->op == nir_texop_txf)) {
address[count++] = lod;
} else if (instr->op == nir_texop_txf_ms && sample_index) {
address[count++] = sample_index;
@@ -4401,7 +4411,7 @@ static void visit_tex(struct nir_to_llvm_context *ctx,
nir_tex_instr *instr)
fmask_ptr, NULL,
txf_address, txf_count, 0xf);
- result = build_tex_intrinsic(ctx, instr, &txf_args);
+ result = build_tex_intrinsic(ctx, instr, false, &txf_args);
result = LLVMBuildExtractElement(ctx->builder, result,
ctx->i32zero, "");
result = emit_int_cmp(ctx, LLVMIntEQ, result, ctx->i32zero);
@@ -4446,7 +4456,7 @@ static void visit_tex(struct nir_to_llvm_context *ctx,
nir_tex_instr *instr)
set_tex_fetch_args(ctx, &args, instr, instr->op,
res_ptr, samp_ptr, address, count, dmask);
- result = build_tex_intrinsic(ctx, instr, &args);
+ result = build_tex_intrinsic(ctx, instr, lod_is_zero, &args);
if (instr->op == nir_texop_query_levels)
result = LLVMBuildExtractElement(ctx->builder, result,
LLVMConstInt(ctx->i32, 3, false), "");
--
2.7.4
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