Module: Mesa
Branch: master
Commit: 05533ce418851b12fd0a1e940a633f9280203aab
URL:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=05533ce418851b12fd0a1e940a633f9280203aab
Author: Bas Nieuwenhuizen <b...@basnieuwenhuizen.nl>
Date: Tue Nov 29 00:18:43 2016 +0100
radv: Use different intrinsic for ubo loads.
Not sure about the deprecation path, but this intrinsic
can be lowered to SMEM loads. This results in a significant
Talos performance improvement.
v2: Fix for LLVM attribute changes.
Signed-off-by: Bas Nieuwenhuizen <ba...@google.com>
Reviewed-by: Dave Airlie <airl...@redhat.com>
---
src/amd/common/ac_nir_to_llvm.c | 30 +++++++++++++++++++++++++++++-
1 file changed, 29 insertions(+), 1 deletion(-)
diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
index f623cc0..c9b0106 100644
--- a/src/amd/common/ac_nir_to_llvm.c
+++ b/src/amd/common/ac_nir_to_llvm.c
@@ -2035,6 +2035,34 @@ static LLVMValueRef visit_load_buffer(struct
nir_to_llvm_context *ctx,
get_def_type(ctx, &instr->dest.ssa), "");
}
+static LLVMValueRef visit_load_ubo_buffer(struct nir_to_llvm_context *ctx,
+ nir_intrinsic_instr *instr)
+{
+ const nir_intrinsic_info *info = &nir_intrinsic_infos[instr->intrinsic];
+ const char *load_name;
+ LLVMTypeRef data_type = ctx->f32;
+ LLVMValueRef results[4], ret;
+ LLVMValueRef rsrc = get_src(ctx, instr->src[0]);
+ LLVMValueRef offset = get_src(ctx, instr->src[1]);
+
+ rsrc = LLVMBuildBitCast(ctx->builder, rsrc, LLVMVectorType(ctx->i8,
16), "");
+
+ for (unsigned i = 0; i < instr->num_components; ++i) {
+ LLVMValueRef params[] = {
+ rsrc,
+ LLVMBuildAdd(ctx->builder, LLVMConstInt(ctx->i32, 4 *
i, 0),
+ offset, "")
+ };
+ results[i] = emit_llvm_intrinsic(ctx, "llvm.SI.load.const",
ctx->f32,
+ params, 2,
AC_FUNC_ATTR_READNONE);
+ }
+
+
+ ret = build_gather_values(ctx, results, instr->num_components);
+ return LLVMBuildBitCast(ctx->builder, ret,
+ get_def_type(ctx, &instr->dest.ssa), "");
+}
+
static void
radv_get_deref_offset(struct nir_to_llvm_context *ctx, nir_deref *tail,
bool vs_in, unsigned *const_out, LLVMValueRef *indir_out)
@@ -2956,7 +2984,7 @@ static void visit_intrinsic(struct nir_to_llvm_context
*ctx,
result = visit_atomic_ssbo(ctx, instr);
break;
case nir_intrinsic_load_ubo:
- result = visit_load_buffer(ctx, instr);
+ result = visit_load_ubo_buffer(ctx, instr);
break;
case nir_intrinsic_get_buffer_size:
result = visit_get_buffer_size(ctx, instr);
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