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ac/llvm: remove LLVM pass ac_optimize_vs_outputs

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Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14414>
This commit is contained in:
Marek Olšák
2021-12-26 19:12:17 -05:00
committed by Marge Bot
parent 3777a5d715
commit 5af4d0c2dc
2 changed files with 0 additions and 265 deletions
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262
src/amd/llvm/ac_llvm_build.c
View File

@@ -2714,268 +2714,6 @@ LLVMValueRef ac_build_bitfield_reverse(struct ac_llvm_context *ctx, LLVMValueRef
return result;
}
#define AC_EXP_TARGET 0
#define AC_EXP_ENABLED_CHANNELS 1
#define AC_EXP_OUT0 2
enum ac_ir_type
{
AC_IR_UNDEF,
AC_IR_CONST,
AC_IR_VALUE,
};
struct ac_vs_exp_chan {
LLVMValueRef value;
float const_float;
enum ac_ir_type type;
};
struct ac_vs_exp_inst {
unsigned offset;
LLVMValueRef inst;
struct ac_vs_exp_chan chan[4];
};
struct ac_vs_exports {
unsigned num;
struct ac_vs_exp_inst exp[VARYING_SLOT_MAX];
};
/* Return true if the PARAM export has been eliminated. */
static bool ac_eliminate_const_output(uint8_t *vs_output_param_offset, uint32_t num_outputs,
struct ac_vs_exp_inst *exp)
{
unsigned i, default_val; /* SPI_PS_INPUT_CNTL_i.DEFAULT_VAL */
bool is_zero[4] = {0}, is_one[4] = {0};
for (i = 0; i < 4; i++) {
/* It's a constant expression. Undef outputs are eliminated too. */
if (exp->chan[i].type == AC_IR_UNDEF) {
is_zero[i] = true;
is_one[i] = true;
} else if (exp->chan[i].type == AC_IR_CONST) {
if (exp->chan[i].const_float == 0)
is_zero[i] = true;
else if (exp->chan[i].const_float == 1)
is_one[i] = true;
else
return false; /* other constant */
} else
return false;
}
/* Only certain combinations of 0 and 1 can be eliminated. */
if (is_zero[0] && is_zero[1] && is_zero[2])
default_val = is_zero[3] ? 0 : 1;
else if (is_one[0] && is_one[1] && is_one[2])
default_val = is_zero[3] ? 2 : 3;
else
return false;
/* The PARAM export can be represented as DEFAULT_VAL. Kill it. */
LLVMInstructionEraseFromParent(exp->inst);
/* Change OFFSET to DEFAULT_VAL. */
for (i = 0; i < num_outputs; i++) {
if (vs_output_param_offset[i] == exp->offset) {
vs_output_param_offset[i] = AC_EXP_PARAM_DEFAULT_VAL_0000 + default_val;
break;
}
}
return true;
}
static bool ac_eliminate_duplicated_output(struct ac_llvm_context *ctx,
uint8_t *vs_output_param_offset, uint32_t num_outputs,
struct ac_vs_exports *processed,
struct ac_vs_exp_inst *exp)
{
unsigned p, copy_back_channels = 0;
/* See if the output is already in the list of processed outputs.
* The LLVMValueRef comparison relies on SSA.
*/
for (p = 0; p < processed->num; p++) {
bool different = false;
for (unsigned j = 0; j < 4; j++) {
struct ac_vs_exp_chan *c1 = &processed->exp[p].chan[j];
struct ac_vs_exp_chan *c2 = &exp->chan[j];
/* Treat undef as a match. */
if (c2->type == AC_IR_UNDEF)
continue;
/* If c1 is undef but c2 isn't, we can copy c2 to c1
* and consider the instruction duplicated.
*/
if (c1->type == AC_IR_UNDEF) {
copy_back_channels |= 1 << j;
continue;
}
/* Test whether the channels are not equal. */
if (c1->type != c2->type ||
(c1->type == AC_IR_CONST && c1->const_float != c2->const_float) ||
(c1->type == AC_IR_VALUE && c1->value != c2->value)) {
different = true;
break;
}
}
if (!different)
break;
copy_back_channels = 0;
}
if (p == processed->num)
return false;
/* If a match was found, but the matching export has undef where the new
* one has a normal value, copy the normal value to the undef channel.
*/
struct ac_vs_exp_inst *match = &processed->exp[p];
/* Get current enabled channels mask. */
LLVMValueRef arg = LLVMGetOperand(match->inst, AC_EXP_ENABLED_CHANNELS);
unsigned enabled_channels = LLVMConstIntGetZExtValue(arg);
while (copy_back_channels) {
unsigned chan = u_bit_scan(&copy_back_channels);
assert(match->chan[chan].type == AC_IR_UNDEF);
LLVMSetOperand(match->inst, AC_EXP_OUT0 + chan, exp->chan[chan].value);
match->chan[chan] = exp->chan[chan];
/* Update number of enabled channels because the original mask
* is not always 0xf.
*/
enabled_channels |= (1 << chan);
LLVMSetOperand(match->inst, AC_EXP_ENABLED_CHANNELS,
LLVMConstInt(ctx->i32, enabled_channels, 0));
}
/* The PARAM export is duplicated. Kill it. */
LLVMInstructionEraseFromParent(exp->inst);
/* Change OFFSET to the matching export. */
for (unsigned i = 0; i < num_outputs; i++) {
if (vs_output_param_offset[i] == exp->offset) {
vs_output_param_offset[i] = match->offset;
break;
}
}
return true;
}
void ac_optimize_vs_outputs(struct ac_llvm_context *ctx, LLVMValueRef main_fn,
uint8_t *vs_output_param_offset, uint32_t num_outputs,
uint32_t skip_output_mask, uint8_t *num_param_exports)
{
LLVMBasicBlockRef bb;
bool removed_any = false;
struct ac_vs_exports exports;
exports.num = 0;
/* Process all LLVM instructions. */
bb = LLVMGetFirstBasicBlock(main_fn);
while (bb) {
LLVMValueRef inst = LLVMGetFirstInstruction(bb);
while (inst) {
LLVMValueRef cur = inst;
inst = LLVMGetNextInstruction(inst);
struct ac_vs_exp_inst exp;
if (LLVMGetInstructionOpcode(cur) != LLVMCall)
continue;
LLVMValueRef callee = ac_llvm_get_called_value(cur);
if (!ac_llvm_is_function(callee))
continue;
const char *name = LLVMGetValueName(callee);
unsigned num_args = LLVMCountParams(callee);
/* Check if this is an export instruction. */
if ((num_args != 9 && num_args != 8) ||
(strcmp(name, "llvm.SI.export") && strcmp(name, "llvm.amdgcn.exp.f32")))
continue;
LLVMValueRef arg = LLVMGetOperand(cur, AC_EXP_TARGET);
unsigned target = LLVMConstIntGetZExtValue(arg);
if (target < V_008DFC_SQ_EXP_PARAM)
continue;
target -= V_008DFC_SQ_EXP_PARAM;
/* Parse the instruction. */
memset(&exp, 0, sizeof(exp));
exp.offset = target;
exp.inst = cur;
for (unsigned i = 0; i < 4; i++) {
LLVMValueRef v = LLVMGetOperand(cur, AC_EXP_OUT0 + i);
exp.chan[i].value = v;
if (LLVMIsUndef(v)) {
exp.chan[i].type = AC_IR_UNDEF;
} else if (LLVMIsAConstantFP(v)) {
LLVMBool loses_info;
exp.chan[i].type = AC_IR_CONST;
exp.chan[i].const_float = LLVMConstRealGetDouble(v, &loses_info);
} else {
exp.chan[i].type = AC_IR_VALUE;
}
}
/* Eliminate constant and duplicated PARAM exports. */
if (!((1u << target) & skip_output_mask) &&
(ac_eliminate_const_output(vs_output_param_offset, num_outputs, &exp) ||
ac_eliminate_duplicated_output(ctx, vs_output_param_offset, num_outputs, &exports,
&exp))) {
removed_any = true;
} else {
exports.exp[exports.num++] = exp;
}
}
bb = LLVMGetNextBasicBlock(bb);
}
/* Remove holes in export memory due to removed PARAM exports.
* This is done by renumbering all PARAM exports.
*/
if (removed_any) {
uint8_t old_offset[VARYING_SLOT_MAX];
unsigned out, i;
/* Make a copy of the offsets. We need the old version while
* we are modifying some of them. */
memcpy(old_offset, vs_output_param_offset, sizeof(old_offset));
for (i = 0; i < exports.num; i++) {
unsigned offset = exports.exp[i].offset;
/* Update vs_output_param_offset. Multiple outputs can
* have the same offset.
*/
for (out = 0; out < num_outputs; out++) {
if (old_offset[out] == offset)
vs_output_param_offset[out] = i;
}
/* Change the PARAM offset in the instruction. */
LLVMSetOperand(exports.exp[i].inst, AC_EXP_TARGET,
LLVMConstInt(ctx->i32, V_008DFC_SQ_EXP_PARAM + i, 0));
}
*num_param_exports = exports.num;
}
}
void ac_init_exec_full_mask(struct ac_llvm_context *ctx)
{
LLVMValueRef full_mask = LLVMConstInt(ctx->i64, ~0ull, 0);

3
src/amd/llvm/ac_llvm_build.h
View File

@@ -460,9 +460,6 @@ LLVMValueRef ac_build_fsat(struct ac_llvm_context *ctx, LLVMValueRef src,
LLVMValueRef ac_build_bitfield_reverse(struct ac_llvm_context *ctx, LLVMValueRef src0);
void ac_optimize_vs_outputs(struct ac_llvm_context *ac, LLVMValueRef main_fn,
uint8_t *vs_output_param_offset, uint32_t num_outputs,
uint32_t skip_output_mask, uint8_t *num_param_exports);
void ac_init_exec_full_mask(struct ac_llvm_context *ctx);
void ac_declare_lds_as_pointer(struct ac_llvm_context *ac);