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/*
* Copyright 2014 Advanced Micro Devices, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
*/
/* based on pieces from si_pipe.c and radeon_llvm_emit.c */
#include "ac_llvm_util.h"
#include <llvm-c/Core.h>
#include "c11/threads.h"
#include <assert.h>
#include <stdio.h>
#include "util/bitscan.h"
#include "util/macros.h"
static void ac_init_llvm_target()
{
#if HAVE_LLVM < 0x0307
LLVMInitializeR600TargetInfo();
LLVMInitializeR600Target();
LLVMInitializeR600TargetMC();
LLVMInitializeR600AsmPrinter();
#else
LLVMInitializeAMDGPUTargetInfo();
LLVMInitializeAMDGPUTarget();
LLVMInitializeAMDGPUTargetMC();
LLVMInitializeAMDGPUAsmPrinter();
#endif
}
static once_flag ac_init_llvm_target_once_flag = ONCE_FLAG_INIT;
static LLVMTargetRef ac_get_llvm_target(const char *triple)
{
LLVMTargetRef target = NULL;
char *err_message = NULL;
call_once(&ac_init_llvm_target_once_flag, ac_init_llvm_target);
if (LLVMGetTargetFromTriple(triple, &target, &err_message)) {
fprintf(stderr, "Cannot find target for triple %s ", triple);
if (err_message) {
fprintf(stderr, "%s\n", err_message);
}
LLVMDisposeMessage(err_message);
return NULL;
}
return target;
}
static const char *ac_get_llvm_processor_name(enum radeon_family family)
{
switch (family) {
case CHIP_TAHITI:
return "tahiti";
case CHIP_PITCAIRN:
return "pitcairn";
case CHIP_VERDE:
return "verde";
case CHIP_OLAND:
return "oland";
case CHIP_HAINAN:
return "hainan";
case CHIP_BONAIRE:
return "bonaire";
case CHIP_KABINI:
return "kabini";
case CHIP_KAVERI:
return "kaveri";
case CHIP_HAWAII:
return "hawaii";
case CHIP_MULLINS:
return "mullins";
case CHIP_TONGA:
return "tonga";
case CHIP_ICELAND:
return "iceland";
case CHIP_CARRIZO:
return "carrizo";
#if HAVE_LLVM <= 0x0307
case CHIP_FIJI:
return "tonga";
case CHIP_STONEY:
return "carrizo";
#else
case CHIP_FIJI:
return "fiji";
case CHIP_STONEY:
return "stoney";
#endif
#if HAVE_LLVM <= 0x0308
case CHIP_POLARIS10:
return "tonga";
case CHIP_POLARIS11:
return "tonga";
#else
case CHIP_POLARIS10:
return "polaris10";
case CHIP_POLARIS11:
return "polaris11";
#endif
default:
return "";
}
}
LLVMTargetMachineRef ac_create_target_machine(enum radeon_family family)
{
assert(family >= CHIP_TAHITI);
const char *triple = "amdgcn--";
LLVMTargetRef target = ac_get_llvm_target(triple);
LLVMTargetMachineRef tm = LLVMCreateTargetMachine(
target,
triple,
ac_get_llvm_processor_name(family),
"+DumpCode,+vgpr-spilling",
LLVMCodeGenLevelDefault,
LLVMRelocDefault,
LLVMCodeModelDefault);
return tm;
}
/* Initialize module-independent parts of the context.
*
* The caller is responsible for initializing ctx::module and ctx::builder.
*/
void
ac_llvm_context_init(struct ac_llvm_context *ctx, LLVMContextRef context)
{
LLVMValueRef args[1];
ctx->context = context;
ctx->module = NULL;
ctx->builder = NULL;
ctx->i32 = LLVMIntTypeInContext(ctx->context, 32);
ctx->f32 = LLVMFloatTypeInContext(ctx->context);
ctx->fpmath_md_kind = LLVMGetMDKindIDInContext(ctx->context, "fpmath", 6);
args[0] = LLVMConstReal(ctx->f32, 2.5);
ctx->fpmath_md_2p5_ulp = LLVMMDNodeInContext(ctx->context, args, 1);
}
#if HAVE_LLVM < 0x0400
static LLVMAttribute ac_attr_to_llvm_attr(enum ac_func_attr attr)
{
switch (attr) {
case AC_FUNC_ATTR_ALWAYSINLINE: return LLVMAlwaysInlineAttribute;
case AC_FUNC_ATTR_BYVAL: return LLVMByValAttribute;
case AC_FUNC_ATTR_INREG: return LLVMInRegAttribute;
case AC_FUNC_ATTR_NOALIAS: return LLVMNoAliasAttribute;
case AC_FUNC_ATTR_NOUNWIND: return LLVMNoUnwindAttribute;
case AC_FUNC_ATTR_READNONE: return LLVMReadNoneAttribute;
case AC_FUNC_ATTR_READONLY: return LLVMReadOnlyAttribute;
default:
fprintf(stderr, "Unhandled function attribute: %x\n", attr);
return 0;
}
}
#else
static const char *attr_to_str(enum ac_func_attr attr)
{
switch (attr) {
case AC_FUNC_ATTR_ALWAYSINLINE: return "alwaysinline";
case AC_FUNC_ATTR_BYVAL: return "byval";
case AC_FUNC_ATTR_INREG: return "inreg";
case AC_FUNC_ATTR_NOALIAS: return "noalias";
case AC_FUNC_ATTR_NOUNWIND: return "nounwind";
case AC_FUNC_ATTR_READNONE: return "readnone";
case AC_FUNC_ATTR_READONLY: return "readonly";
default:
fprintf(stderr, "Unhandled function attribute: %x\n", attr);
return 0;
}
}
#endif
void
ac_add_function_attr(LLVMValueRef function,
int attr_idx,
enum ac_func_attr attr)
{
#if HAVE_LLVM < 0x0400
LLVMAttribute llvm_attr = ac_attr_to_llvm_attr(attr);
if (attr_idx == -1) {
LLVMAddFunctionAttr(function, llvm_attr);
} else {
LLVMAddAttribute(LLVMGetParam(function, attr_idx - 1), llvm_attr);
}
#else
LLVMContextRef context = LLVMGetModuleContext(LLVMGetGlobalParent(function));
const char *attr_name = attr_to_str(attr);
unsigned kind_id = LLVMGetEnumAttributeKindForName(attr_name,
strlen(attr_name));
LLVMAttributeRef llvm_attr = LLVMCreateEnumAttribute(context, kind_id, 0);
LLVMAddAttributeAtIndex(function, attr_idx, llvm_attr);
#endif
}
LLVMValueRef
ac_emit_llvm_intrinsic(struct ac_llvm_context *ctx, const char *name,
LLVMTypeRef return_type, LLVMValueRef *params,
unsigned param_count, unsigned attrib_mask)
{
LLVMValueRef function;
function = LLVMGetNamedFunction(ctx->module, name);
if (!function) {
LLVMTypeRef param_types[32], function_type;
unsigned i;
assert(param_count <= 32);
for (i = 0; i < param_count; ++i) {
assert(params[i]);
param_types[i] = LLVMTypeOf(params[i]);
}
function_type =
LLVMFunctionType(return_type, param_types, param_count, 0);
function = LLVMAddFunction(ctx->module, name, function_type);
LLVMSetFunctionCallConv(function, LLVMCCallConv);
LLVMSetLinkage(function, LLVMExternalLinkage);
attrib_mask |= AC_FUNC_ATTR_NOUNWIND;
while (attrib_mask) {
enum ac_func_attr attr = 1u << u_bit_scan(&attrib_mask);
ac_add_function_attr(function, -1, attr);
}
}
return LLVMBuildCall(ctx->builder, function, params, param_count, "");
}
LLVMValueRef
ac_build_gather_values_extended(struct ac_llvm_context *ctx,
LLVMValueRef *values,
unsigned value_count,
unsigned value_stride,
bool load)
{
LLVMBuilderRef builder = ctx->builder;
LLVMValueRef vec;
unsigned i;
if (value_count == 1) {
if (load)
return LLVMBuildLoad(builder, values[0], "");
return values[0];
} else if (!value_count)
unreachable("value_count is 0");
for (i = 0; i < value_count; i++) {
LLVMValueRef value = values[i * value_stride];
if (load)
value = LLVMBuildLoad(builder, value, "");
if (!i)
vec = LLVMGetUndef( LLVMVectorType(LLVMTypeOf(value), value_count));
LLVMValueRef index = LLVMConstInt(ctx->i32, i, false);
vec = LLVMBuildInsertElement(builder, vec, value, index, "");
}
return vec;
}
LLVMValueRef
ac_build_gather_values(struct ac_llvm_context *ctx,
LLVMValueRef *values,
unsigned value_count)
{
return ac_build_gather_values_extended(ctx, values, value_count, 1, false);
}
LLVMValueRef
ac_emit_fdiv(struct ac_llvm_context *ctx,
LLVMValueRef num,
LLVMValueRef den)
{
LLVMValueRef ret = LLVMBuildFDiv(ctx->builder, num, den, "");
if (!LLVMIsConstant(ret))
LLVMSetMetadata(ret, ctx->fpmath_md_kind, ctx->fpmath_md_2p5_ulp);
return ret;
}
/* Coordinates for cube map selection. sc, tc, and ma are as in Table 8.27
* of the OpenGL 4.5 (Compatibility Profile) specification, except ma is
* already multiplied by two. id is the cube face number.
*/
struct cube_selection_coords {
LLVMValueRef stc[2];
LLVMValueRef ma;
LLVMValueRef id;
};
static void
build_cube_intrinsic(struct ac_llvm_context *ctx,
LLVMValueRef in[3],
struct cube_selection_coords *out)
{
LLVMBuilderRef builder = ctx->builder;
if (HAVE_LLVM >= 0x0309) {
LLVMTypeRef f32 = ctx->f32;
out->stc[1] = ac_emit_llvm_intrinsic(ctx, "llvm.amdgcn.cubetc",
f32, in, 3, AC_FUNC_ATTR_READNONE);
out->stc[0] = ac_emit_llvm_intrinsic(ctx, "llvm.amdgcn.cubesc",
f32, in, 3, AC_FUNC_ATTR_READNONE);
out->ma = ac_emit_llvm_intrinsic(ctx, "llvm.amdgcn.cubema",
f32, in, 3, AC_FUNC_ATTR_READNONE);
out->id = ac_emit_llvm_intrinsic(ctx, "llvm.amdgcn.cubeid",
f32, in, 3, AC_FUNC_ATTR_READNONE);
} else {
LLVMValueRef c[4] = {
in[0],
in[1],
in[2],
LLVMGetUndef(LLVMTypeOf(in[0]))
};
LLVMValueRef vec = ac_build_gather_values(ctx, c, 4);
LLVMValueRef tmp =
ac_emit_llvm_intrinsic(ctx, "llvm.AMDGPU.cube",
LLVMTypeOf(vec), &vec, 1,
AC_FUNC_ATTR_READNONE);
out->stc[1] = LLVMBuildExtractElement(builder, tmp,
LLVMConstInt(ctx->i32, 0, 0), "");
out->stc[0] = LLVMBuildExtractElement(builder, tmp,
LLVMConstInt(ctx->i32, 1, 0), "");
out->ma = LLVMBuildExtractElement(builder, tmp,
LLVMConstInt(ctx->i32, 2, 0), "");
out->id = LLVMBuildExtractElement(builder, tmp,
LLVMConstInt(ctx->i32, 3, 0), "");
}
}
/**
* Build a manual selection sequence for cube face sc/tc coordinates and
* major axis vector (multiplied by 2 for consistency) for the given
* vec3 \p coords, for the face implied by \p selcoords.
*
* For the major axis, we always adjust the sign to be in the direction of
* selcoords.ma; i.e., a positive out_ma means that coords is pointed towards
* the selcoords major axis.
*/
static void build_cube_select(LLVMBuilderRef builder,
const struct cube_selection_coords *selcoords,
const LLVMValueRef *coords,
LLVMValueRef *out_st,
LLVMValueRef *out_ma)
{
LLVMTypeRef f32 = LLVMTypeOf(coords[0]);
LLVMValueRef is_ma_positive;
LLVMValueRef sgn_ma;
LLVMValueRef is_ma_z, is_not_ma_z;
LLVMValueRef is_ma_y;
LLVMValueRef is_ma_x;
LLVMValueRef sgn;
LLVMValueRef tmp;
is_ma_positive = LLVMBuildFCmp(builder, LLVMRealUGE,
selcoords->ma, LLVMConstReal(f32, 0.0), "");
sgn_ma = LLVMBuildSelect(builder, is_ma_positive,
LLVMConstReal(f32, 1.0), LLVMConstReal(f32, -1.0), "");
is_ma_z = LLVMBuildFCmp(builder, LLVMRealUGE, selcoords->id, LLVMConstReal(f32, 4.0), "");
is_not_ma_z = LLVMBuildNot(builder, is_ma_z, "");
is_ma_y = LLVMBuildAnd(builder, is_not_ma_z,
LLVMBuildFCmp(builder, LLVMRealUGE, selcoords->id, LLVMConstReal(f32, 2.0), ""), "");
is_ma_x = LLVMBuildAnd(builder, is_not_ma_z, LLVMBuildNot(builder, is_ma_y, ""), "");
/* Select sc */
tmp = LLVMBuildSelect(builder, is_ma_z, coords[2], coords[0], "");
sgn = LLVMBuildSelect(builder, is_ma_y, LLVMConstReal(f32, 1.0),
LLVMBuildSelect(builder, is_ma_x, sgn_ma,
LLVMBuildFNeg(builder, sgn_ma, ""), ""), "");
out_st[0] = LLVMBuildFMul(builder, tmp, sgn, "");
/* Select tc */
tmp = LLVMBuildSelect(builder, is_ma_y, coords[2], coords[1], "");
sgn = LLVMBuildSelect(builder, is_ma_y, LLVMBuildFNeg(builder, sgn_ma, ""),
LLVMConstReal(f32, -1.0), "");
out_st[1] = LLVMBuildFMul(builder, tmp, sgn, "");
/* Select ma */
tmp = LLVMBuildSelect(builder, is_ma_z, coords[2],
LLVMBuildSelect(builder, is_ma_y, coords[1], coords[0], ""), "");
sgn = LLVMBuildSelect(builder, is_ma_positive,
LLVMConstReal(f32, 2.0), LLVMConstReal(f32, -2.0), "");
*out_ma = LLVMBuildFMul(builder, tmp, sgn, "");
}
void
ac_prepare_cube_coords(struct ac_llvm_context *ctx,
bool is_deriv, bool is_array,
LLVMValueRef *coords_arg,
LLVMValueRef *derivs_arg)
{
LLVMBuilderRef builder = ctx->builder;
struct cube_selection_coords selcoords;
LLVMValueRef coords[3];
LLVMValueRef invma;
build_cube_intrinsic(ctx, coords_arg, &selcoords);
invma = ac_emit_llvm_intrinsic(ctx, "llvm.fabs.f32",
ctx->f32, &selcoords.ma, 1, AC_FUNC_ATTR_READNONE);
invma = ac_emit_fdiv(ctx, LLVMConstReal(ctx->f32, 1.0), invma);
for (int i = 0; i < 2; ++i)
coords[i] = LLVMBuildFMul(builder, selcoords.stc[i], invma, "");
coords[2] = selcoords.id;
if (is_deriv && derivs_arg) {
LLVMValueRef derivs[4];
int axis;
/* Convert cube derivatives to 2D derivatives. */
for (axis = 0; axis < 2; axis++) {
LLVMValueRef deriv_st[2];
LLVMValueRef deriv_ma;
/* Transform the derivative alongside the texture
* coordinate. Mathematically, the correct formula is
* as follows. Assume we're projecting onto the +Z face
* and denote by dx/dh the derivative of the (original)
* X texture coordinate with respect to horizontal
* window coordinates. The projection onto the +Z face
* plane is:
*
* f(x,z) = x/z
*
* Then df/dh = df/dx * dx/dh + df/dz * dz/dh
* = 1/z * dx/dh - x/z * 1/z * dz/dh.
*
* This motivatives the implementation below.
*
* Whether this actually gives the expected results for
* apps that might feed in derivatives obtained via
* finite differences is anyone's guess. The OpenGL spec
* seems awfully quiet about how textureGrad for cube
* maps should be handled.
*/
build_cube_select(builder, &selcoords, &derivs_arg[axis * 3],
deriv_st, &deriv_ma);
deriv_ma = LLVMBuildFMul(builder, deriv_ma, invma, "");
for (int i = 0; i < 2; ++i)
derivs[axis * 2 + i] =
LLVMBuildFSub(builder,
LLVMBuildFMul(builder, deriv_st[i], invma, ""),
LLVMBuildFMul(builder, deriv_ma, coords[i], ""), "");
}
memcpy(derivs_arg, derivs, sizeof(derivs));
}
/* Shift the texture coordinate. This must be applied after the
* derivative calculation.
*/
for (int i = 0; i < 2; ++i)
coords[i] = LLVMBuildFAdd(builder, coords[i], LLVMConstReal(ctx->f32, 1.5), "");
if (is_array) {
/* for cube arrays coord.z = coord.w(array_index) * 8 + face */
/* coords_arg.w component - array_index for cube arrays */
LLVMValueRef tmp = LLVMBuildFMul(ctx->builder, coords_arg[3], LLVMConstReal(ctx->f32, 8.0), "");
coords[2] = LLVMBuildFAdd(ctx->builder, tmp, coords[2], "");
}
memcpy(coords_arg, coords, sizeof(coords));
}
void
ac_dump_module(LLVMModuleRef module)
{
char *str = LLVMPrintModuleToString(module);
fprintf(stderr, "%s", str);
LLVMDisposeMessage(str);
}
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