Re: [Mesa-dev] [PATCH] ac/nir: Use an array instead of hashtable for SSA defs.

[Timothy Arceri]

On 10/04/18 17:33, Bas Nieuwenhuizen wrote:

Saves about 2% of compile time for F1 2017, as well as reduce code
size of an optimized libvulkan_radeon.so by about 1 KiB.

This still keeps the hashtable, as we also stored blocks in there.
---
  src/amd/common/ac_nir_to_llvm.c | 22 +++++++++++++---------
  1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/src/amd/common/ac_nir_to_llvm.c b/src/amd/common/ac_nir_to_llvm.c
index 053c19808f..7c2bd5c0cc 100644
--- a/src/amd/common/ac_nir_to_llvm.c
+++ b/src/amd/common/ac_nir_to_llvm.c
@@ -38,6 +38,8 @@ struct ac_nir_context {

gl_shader_stage stage; + LLVMValueRef *ssa_defs;

+
        struct hash_table *defs;
        struct hash_table *phis;
        struct hash_table *vars;
@@ -87,8 +89,7 @@ static LLVMTypeRef get_def_type(struct ac_nir_context *ctx,
  static LLVMValueRef get_src(struct ac_nir_context *nir, nir_src src)
  {
        assert(src.is_ssa);
-       struct hash_entry *entry = _mesa_hash_table_search(nir->defs, src.ssa);
-       return (LLVMValueRef)entry->data;
+       return nir->ssa_defs[src.ssa->index];
  }

static LLVMValueRef

@@ -1028,8 +1029,7 @@ static void visit_alu(struct ac_nir_context *ctx, const 
nir_alu_instr *instr)
        if (result) {
                assert(instr->dest.dest.is_ssa);
                result = ac_to_integer(&ctx->ac, result);
-               _mesa_hash_table_insert(ctx->defs, &instr->dest.dest.ssa,
-                                       result);
+               ctx->ssa_defs[instr->dest.dest.ssa.index] = result;
        }
  }

@@ -1062,7 +1062,7 @@ static void visit_load_const(struct ac_nir_context *ctx,

        } else
                value = values[0];

- _mesa_hash_table_insert(ctx->defs, &instr->def, value);

+       ctx->ssa_defs[instr->def.index] = value;
  }

static LLVMValueRef

@@ -3095,7 +3095,7 @@ static void visit_intrinsic(struct ac_nir_context *ctx,
                break;
        }
        if (result) {
-               _mesa_hash_table_insert(ctx->defs, &instr->dest.ssa, result);
+               ctx->ssa_defs[instr->dest.ssa.index] = result;
        }
  }

@@ -3596,7 +3596,7 @@ write_result:

        if (result) {
                assert(instr->dest.is_ssa);
                result = ac_to_integer(&ctx->ac, result);
-               _mesa_hash_table_insert(ctx->defs, &instr->dest.ssa, result);
+               ctx->ssa_defs[instr->dest.ssa.index] = result;
        }
  }

@@ -3606,7 +3606,7 @@ static void visit_phi(struct ac_nir_context *ctx, nir_phi_instr *instr)

        LLVMTypeRef type = get_def_type(ctx, &instr->dest.ssa);
        LLVMValueRef result = LLVMBuildPhi(ctx->ac.builder, type, "");

- _mesa_hash_table_insert(ctx->defs, &instr->dest.ssa, result);

+       ctx->ssa_defs[instr->dest.ssa.index] = result;
        _mesa_hash_table_insert(ctx->phis, instr, result);
  }

@@ -3644,7 +3644,7 @@ static void visit_ssa_undef(struct ac_nir_context *ctx,

        else {
                undef = LLVMGetUndef(LLVMVectorType(type, num_components));
        }
-       _mesa_hash_table_insert(ctx->defs, &instr->def, undef);
+       ctx->ssa_defs[instr->def.index] = undef;
  }

static void visit_jump(struct ac_llvm_context *ctx,

@@ -3927,6 +3927,9 @@ void ac_nir_translate(struct ac_llvm_context *ac, struct 
ac_shader_abi *abi,

func = (struct nir_function *)exec_list_get_head(&nir->functions); + nir_index_ssa_defs(func->impl);

+       ctx.ssa_defs = calloc(func->impl->ssa_alloc, sizeof(LLVMValueRef));

You don't seem to allocate enough memory here?
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