src/gallium/drivers/radeonsi/si_shader_llvm.c

   1 /*
   2  * Copyright 2016 Advanced Micro Devices, Inc.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * on the rights to use, copy, modify, merge, publish, distribute, sub
   9  * license, and/or sell copies of the Software, and to permit persons to whom
  10  * the Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  22  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 #include "si_shader_internal.h"
  26 #include "si_pipe.h"
  27 #include "ac_rtld.h"
  28 #include "sid.h"
  29
  30 #include "tgsi/tgsi_from_mesa.h"
  31 #include "util/u_memory.h"
  32
  33 struct si_llvm_diagnostics {
  34         struct pipe_debug_callback *debug;
  35         unsigned retval;
  36 };
  37
  38 static void si_diagnostic_handler(LLVMDiagnosticInfoRef di, void *context)
  39 {
  40         struct si_llvm_diagnostics *diag = (struct si_llvm_diagnostics *)context;
  41         LLVMDiagnosticSeverity severity = LLVMGetDiagInfoSeverity(di);
  42         const char *severity_str = NULL;
  43
  44         switch (severity) {
  45         case LLVMDSError:
  46                 severity_str = "error";
  47                 break;
  48         case LLVMDSWarning:
  49                 severity_str = "warning";
  50                 break;
  51         case LLVMDSRemark:
  52         case LLVMDSNote:
  53         default:
  54                 return;
  55         }
  56
  57         char *description = LLVMGetDiagInfoDescription(di);
  58
  59         pipe_debug_message(diag->debug, SHADER_INFO,
  60                            "LLVM diagnostic (%s): %s", severity_str, description);
  61
  62         if (severity == LLVMDSError) {
  63                 diag->retval = 1;
  64                 fprintf(stderr,"LLVM triggered Diagnostic Handler: %s\n", description);
  65         }
  66
  67         LLVMDisposeMessage(description);
  68 }
  69
  70 int si_compile_llvm(struct si_screen *sscreen,
  71                     struct si_shader_binary *binary,
  72                     struct ac_shader_config *conf,
  73                     struct ac_llvm_compiler *compiler,
  74                     struct ac_llvm_context *ac,
  75                     struct pipe_debug_callback *debug,
  76                     enum pipe_shader_type shader_type,
  77                     const char *name,
  78                     bool less_optimized)
  79 {
  80         unsigned count = p_atomic_inc_return(&sscreen->num_compilations);
  81
  82         if (si_can_dump_shader(sscreen, shader_type)) {
  83                 fprintf(stderr, "radeonsi: Compiling shader %d\n", count);
  84
  85                 if (!(sscreen->debug_flags & (DBG(NO_IR) | DBG(PREOPT_IR)))) {
  86                         fprintf(stderr, "%s LLVM IR:\n\n", name);
  87                         ac_dump_module(ac->module);
  88                         fprintf(stderr, "\n");
  89                 }
  90         }
  91
  92         if (sscreen->record_llvm_ir) {
  93                 char *ir = LLVMPrintModuleToString(ac->module);
  94                 binary->llvm_ir_string = strdup(ir);
  95                 LLVMDisposeMessage(ir);
  96         }
  97
  98         if (!si_replace_shader(count, binary)) {
  99                 struct ac_compiler_passes *passes = compiler->passes;
 100
 101                 if (ac->wave_size == 32)
 102                         passes = compiler->passes_wave32;
 103                 else if (less_optimized && compiler->low_opt_passes)
 104                         passes = compiler->low_opt_passes;
 105
 106                 struct si_llvm_diagnostics diag = {debug};
 107                 LLVMContextSetDiagnosticHandler(ac->context, si_diagnostic_handler, &diag);
 108
 109                 if (!ac_compile_module_to_elf(passes, ac->module,
 110                                               (char **)&binary->elf_buffer,
 111                                               &binary->elf_size))
 112                         diag.retval = 1;
 113
 114                 if (diag.retval != 0) {
 115                         pipe_debug_message(debug, SHADER_INFO, "LLVM compilation failed");
 116                         return diag.retval;
 117                 }
 118         }
 119
 120         struct ac_rtld_binary rtld;
 121         if (!ac_rtld_open(&rtld, (struct ac_rtld_open_info){
 122                         .info = &sscreen->info,
 123                         .shader_type = tgsi_processor_to_shader_stage(shader_type),
 124                         .wave_size = ac->wave_size,
 125                         .num_parts = 1,
 126                         .elf_ptrs = &binary->elf_buffer,
 127                         .elf_sizes = &binary->elf_size }))
 128                 return -1;
 129
 130         bool ok = ac_rtld_read_config(&rtld, conf);
 131         ac_rtld_close(&rtld);
 132         if (!ok)
 133                 return -1;
 134
 135         /* Enable 64-bit and 16-bit denormals, because there is no performance
 136          * cost.
 137          *
 138          * If denormals are enabled, all floating-point output modifiers are
 139          * ignored.
 140          *
 141          * Don't enable denormals for 32-bit floats, because:
 142          * - Floating-point output modifiers would be ignored by the hw.
 143          * - Some opcodes don't support denormals, such as v_mad_f32. We would
 144          *   have to stop using those.
 145          * - GFX6 & GFX7 would be very slow.
 146          */
 147         conf->float_mode |= V_00B028_FP_64_DENORMS;
 148
 149         return 0;
 150 }
 151
 152 void si_shader_binary_clean(struct si_shader_binary *binary)
 153 {
 154         free((void *)binary->elf_buffer);
 155         binary->elf_buffer = NULL;
 156
 157         free(binary->llvm_ir_string);
 158         binary->llvm_ir_string = NULL;
 159 }
 160
 161 void si_llvm_context_init(struct si_shader_context *ctx,
 162                           struct si_screen *sscreen,
 163                           struct ac_llvm_compiler *compiler,
 164                           unsigned wave_size)
 165 {
 166         memset(ctx, 0, sizeof(*ctx));
 167         ctx->screen = sscreen;
 168         ctx->compiler = compiler;
 169
 170         ac_llvm_context_init(&ctx->ac, compiler, sscreen->info.chip_class,
 171                              sscreen->info.family,
 172                              AC_FLOAT_MODE_NO_SIGNED_ZEROS_FP_MATH,
 173                              wave_size, 64);
 174 }
 175
 176 /* Set the context to a certain shader. Can be called repeatedly
 177  * to change the shader. */
 178 void si_llvm_context_set_ir(struct si_shader_context *ctx,
 179                             struct si_shader *shader)
 180 {
 181         struct si_shader_selector *sel = shader->selector;
 182         const struct si_shader_info *info = &sel->info;
 183
 184         ctx->shader = shader;
 185         ctx->type = sel->type;
 186
 187         ctx->num_const_buffers = util_last_bit(info->const_buffers_declared);
 188         ctx->num_shader_buffers = util_last_bit(info->shader_buffers_declared);
 189
 190         ctx->num_samplers = util_last_bit(info->samplers_declared);
 191         ctx->num_images = util_last_bit(info->images_declared);
 192 }
 193
 194 void si_llvm_create_func(struct si_shader_context *ctx, const char *name,
 195                          LLVMTypeRef *return_types, unsigned num_return_elems,
 196                          unsigned max_workgroup_size)
 197 {
 198         LLVMTypeRef ret_type;
 199         enum ac_llvm_calling_convention call_conv;
 200         enum pipe_shader_type real_shader_type;
 201
 202         if (num_return_elems)
 203                 ret_type = LLVMStructTypeInContext(ctx->ac.context,
 204                                                    return_types,
 205                                                    num_return_elems, true);
 206         else
 207                 ret_type = ctx->ac.voidt;
 208
 209         real_shader_type = ctx->type;
 210
 211         /* LS is merged into HS (TCS), and ES is merged into GS. */
 212         if (ctx->screen->info.chip_class >= GFX9) {
 213                 if (ctx->shader->key.as_ls)
 214                         real_shader_type = PIPE_SHADER_TESS_CTRL;
 215                 else if (ctx->shader->key.as_es || ctx->shader->key.as_ngg)
 216                         real_shader_type = PIPE_SHADER_GEOMETRY;
 217         }
 218
 219         switch (real_shader_type) {
 220         case PIPE_SHADER_VERTEX:
 221         case PIPE_SHADER_TESS_EVAL:
 222                 call_conv = AC_LLVM_AMDGPU_VS;
 223                 break;
 224         case PIPE_SHADER_TESS_CTRL:
 225                 call_conv = AC_LLVM_AMDGPU_HS;
 226                 break;
 227         case PIPE_SHADER_GEOMETRY:
 228                 call_conv = AC_LLVM_AMDGPU_GS;
 229                 break;
 230         case PIPE_SHADER_FRAGMENT:
 231                 call_conv = AC_LLVM_AMDGPU_PS;
 232                 break;
 233         case PIPE_SHADER_COMPUTE:
 234                 call_conv = AC_LLVM_AMDGPU_CS;
 235                 break;
 236         default:
 237                 unreachable("Unhandle shader type");
 238         }
 239
 240         /* Setup the function */
 241         ctx->return_type = ret_type;
 242         ctx->main_fn = ac_build_main(&ctx->args, &ctx->ac, call_conv, name,
 243                                      ret_type, ctx->ac.module);
 244         ctx->return_value = LLVMGetUndef(ctx->return_type);
 245
 246         if (ctx->screen->info.address32_hi) {
 247                 ac_llvm_add_target_dep_function_attr(ctx->main_fn,
 248                                                      "amdgpu-32bit-address-high-bits",
 249                                                      ctx->screen->info.address32_hi);
 250         }
 251
 252         LLVMAddTargetDependentFunctionAttr(ctx->main_fn,
 253                                            "no-signed-zeros-fp-math",
 254                                            "true");
 255
 256         ac_llvm_set_workgroup_size(ctx->main_fn, max_workgroup_size);
 257 }
 258
 259 void si_llvm_optimize_module(struct si_shader_context *ctx)
 260 {
 261         /* Dump LLVM IR before any optimization passes */
 262         if (ctx->screen->debug_flags & DBG(PREOPT_IR) &&
 263             si_can_dump_shader(ctx->screen, ctx->type))
 264                 LLVMDumpModule(ctx->ac.module);
 265
 266         /* Run the pass */
 267         LLVMRunPassManager(ctx->compiler->passmgr, ctx->ac.module);
 268         LLVMDisposeBuilder(ctx->ac.builder);
 269 }
 270
 271 void si_llvm_dispose(struct si_shader_context *ctx)
 272 {
 273         LLVMDisposeModule(ctx->ac.module);
 274         LLVMContextDispose(ctx->ac.context);
 275         ac_llvm_context_dispose(&ctx->ac);
 276 }