#include "main/macros.h"
#include "shader/prog_parameter.h"
+#include "shader/prog_print.h"
+#include "shader/prog_optimize.h"
#include "brw_context.h"
#include "brw_eu.h"
#include "brw_wm.h"
}
+
+static void
+reclaim_temps(struct brw_wm_compile *c);
+
+
+/** Mark GRF register as used. */
+static void
+prealloc_grf(struct brw_wm_compile *c, int r)
+{
+ c->used_grf[r] = GL_TRUE;
+}
+
+
+/** Mark given GRF register as not in use. */
+static void
+release_grf(struct brw_wm_compile *c, int r)
+{
+ /*assert(c->used_grf[r]);*/
+ c->used_grf[r] = GL_FALSE;
+ c->first_free_grf = MIN2(c->first_free_grf, r);
+}
+
+
+/** Return index of a free GRF, mark it as used. */
+static int
+alloc_grf(struct brw_wm_compile *c)
+{
+ GLuint r;
+ for (r = c->first_free_grf; r < BRW_WM_MAX_GRF; r++) {
+ if (!c->used_grf[r]) {
+ c->used_grf[r] = GL_TRUE;
+ c->first_free_grf = r + 1; /* a guess */
+ return r;
+ }
+ }
+
+ /* no free temps, try to reclaim some */
+ reclaim_temps(c);
+ c->first_free_grf = 0;
+
+ /* try alloc again */
+ for (r = c->first_free_grf; r < BRW_WM_MAX_GRF; r++) {
+ if (!c->used_grf[r]) {
+ c->used_grf[r] = GL_TRUE;
+ c->first_free_grf = r + 1; /* a guess */
+ return r;
+ }
+ }
+
+ for (r = 0; r < BRW_WM_MAX_GRF; r++) {
+ assert(c->used_grf[r]);
+ }
+ /*printf("Really out of temp regs!\n");*/
+ return 60;
+}
+
+
+/** Return number of GRF registers used */
+static int
+num_grf_used(const struct brw_wm_compile *c)
+{
+ int r;
+ for (r = BRW_WM_MAX_GRF - 1; r >= 0; r--)
+ if (c->used_grf[r])
+ return r + 1;
+ return 0;
+}
+
+
+
/**
* Record the mapping of a Mesa register to a hardware register.
*/
static struct brw_reg alloc_tmp(struct brw_wm_compile *c)
{
struct brw_reg reg;
- if(c->tmp_index == c->tmp_max)
- c->tmp_regs[ c->tmp_max++ ] = c->reg_index++;
-
+
+ /* if we need to allocate another temp, grow the tmp_regs[] array */
+ if (c->tmp_index == c->tmp_max) {
+ c->tmp_regs[ c->tmp_max++ ] = alloc_grf(c);
+ }
+
+ /* form the GRF register */
reg = brw_vec8_grf(c->tmp_regs[ c->tmp_index++ ], 0);
+ /*printf("alloc_temp %d\n", reg.nr);*/
+ assert(reg.nr < BRW_WM_MAX_GRF);
return reg;
+
}
/**
return brw_null_reg();
}
+ assert(index < 256);
/* see if we've already allocated a HW register for this Mesa register */
if (c->wm_regs[file][index][component].inited) {
- /* yes, re-use */
- reg = c->wm_regs[file][index][component].reg;
+ /* yes, re-use */
+ reg = c->wm_regs[file][index][component].reg;
}
else {
/* no, allocate new register */
- reg = brw_vec8_grf(c->reg_index, 0);
- }
+ int grf = alloc_grf(c);
+ if (grf < 0) {
+ /* totally out of temps */
+ grf = 70; /* XXX !!!! */
+ }
- /* if this is a new register allocation, record it in the table */
- if (!c->wm_regs[file][index][component].inited) {
- set_reg(c, file, index, component, reg);
- c->reg_index++;
- }
+ reg = brw_vec8_grf(grf, 0);
+ /*printf("Alloc new grf %d for %d.%d\n", reg.nr, index, component);*/
- if (c->reg_index >= BRW_WM_MAX_GRF - 12) {
- /* ran out of temporary registers! */
-#if 1
- /* This is a big hack for now.
- * Return bad register index, just don't hang the GPU.
- */
- _mesa_fprintf(stderr, "out of regs %d\n", c->reg_index);
- c->reg_index = BRW_WM_MAX_GRF - 13;
-#else
- return brw_null_reg();
-#endif
+ set_reg(c, file, index, component, reg);
}
-
+
if (neg & (1 << component)) {
reg = negate(reg);
}
}
+
+/**
+ * This is called if we run out of GRF registers. Examine the live intervals
+ * of temp regs in the program and free those which won't be used again.
+ */
+static void
+reclaim_temps(struct brw_wm_compile *c)
+{
+ GLint intBegin[MAX_PROGRAM_TEMPS];
+ GLint intEnd[MAX_PROGRAM_TEMPS];
+ int index;
+
+ /*printf("Reclaim temps:\n");*/
+
+ _mesa_find_temp_intervals(c->prog_instructions, c->nr_fp_insns,
+ intBegin, intEnd);
+
+ for (index = 0; index < MAX_PROGRAM_TEMPS; index++) {
+ if (intEnd[index] != -1 && intEnd[index] < c->cur_inst) {
+ /* program temp[i] can be freed */
+ int component;
+ /*printf(" temp[%d] is dead\n", index);*/
+ for (component = 0; component < 4; component++) {
+ if (c->wm_regs[PROGRAM_TEMPORARY][index][component].inited) {
+ int r = c->wm_regs[PROGRAM_TEMPORARY][index][component].reg.nr;
+ release_grf(c, r);
+ /*
+ printf(" Reclaim temp %d, reg %d at inst %d\n",
+ index, r, c->cur_inst);
+ */
+ c->wm_regs[PROGRAM_TEMPORARY][index][component].inited = GL_FALSE;
+ }
+ }
+ }
+ }
+}
+
+
+
+
/**
* Preallocate registers. This sets up the Mesa to hardware register
* mapping for certain registers, such as constants (uniforms/state vars)
struct brw_reg reg;
int nr_interp_regs = 0;
GLuint inputs = FRAG_BIT_WPOS | c->fp_interp_emitted | c->fp_deriv_emitted;
+ GLuint reg_index = 0;
+
+ memset(c->used_grf, GL_FALSE, sizeof(c->used_grf));
+ c->first_free_grf = 0;
for (i = 0; i < 4; i++) {
if (i < c->key.nr_depth_regs)
reg = brw_vec8_grf(0, 0);
set_reg(c, PROGRAM_PAYLOAD, PAYLOAD_DEPTH, i, reg);
}
- c->reg_index += 2 * c->key.nr_depth_regs;
+ reg_index += 2 * c->key.nr_depth_regs;
/* constants */
{
- const int nr_params = c->fp->program.Base.Parameters->NumParameters;
+ const GLuint nr_params = c->fp->program.Base.Parameters->NumParameters;
+ const GLuint nr_temps = c->fp->program.Base.NumTemporaries;
/* use a real constant buffer, or just use a section of the GRF? */
- c->use_const_buffer = GL_FALSE; /* (nr_params > 8);*/
+ /* XXX this heuristic may need adjustment... */
+ if ((nr_params + nr_temps) * 4 + reg_index > 80)
+ c->use_const_buffer = GL_TRUE;
+ else
+ c->use_const_buffer = GL_FALSE;
+ /*printf("WM use_const_buffer = %d\n", c->use_const_buffer);*/
if (c->use_const_buffer) {
/* We'll use a real constant buffer and fetch constants from
for (i = 0; i < nr_params; i++) {
/* loop over XYZW channels */
for (j = 0; j < 4; j++, index++) {
- reg = brw_vec1_grf(c->reg_index + index / 8, index % 8);
+ reg = brw_vec1_grf(reg_index + index / 8, index % 8);
/* Save pointer to parameter/constant value.
* Constants will be copied in prepare_constant_buffer()
*/
}
/* number of constant regs used (each reg is float[8]) */
c->nr_creg = 2 * ((4 * nr_params + 15) / 16);
- c->reg_index += c->nr_creg;
+ reg_index += c->nr_creg;
}
}
for (i = 0; i < FRAG_ATTRIB_MAX; i++) {
if (inputs & (1<<i)) {
nr_interp_regs++;
- reg = brw_vec8_grf(c->reg_index, 0);
+ reg = brw_vec8_grf(reg_index, 0);
for (j = 0; j < 4; j++)
set_reg(c, PROGRAM_PAYLOAD, i, j, reg);
- c->reg_index += 2;
+ reg_index += 2;
}
}
c->prog_data.first_curbe_grf = c->key.nr_depth_regs * 2;
c->prog_data.urb_read_length = nr_interp_regs * 2;
c->prog_data.curb_read_length = c->nr_creg;
- c->emit_mask_reg = brw_uw1_reg(BRW_GENERAL_REGISTER_FILE, c->reg_index, 0);
- c->reg_index++;
- c->stack = brw_uw16_reg(BRW_GENERAL_REGISTER_FILE, c->reg_index, 0);
- c->reg_index += 2;
+ c->emit_mask_reg = brw_uw1_reg(BRW_GENERAL_REGISTER_FILE, reg_index, 0);
+ reg_index++;
+ c->stack = brw_uw16_reg(BRW_GENERAL_REGISTER_FILE, reg_index, 0);
+ reg_index += 2;
+
+ /* mark GRF regs [0..reg_index-1] as in-use */
+ for (i = 0; i < reg_index; i++)
+ prealloc_grf(c, i);
/* An instruction may reference up to three constants.
* They'll be found in these registers.
if (c->use_const_buffer) {
for (i = 0; i < 3; i++) {
c->current_const[i].index = -1;
- c->current_const[i].reg = alloc_tmp(c);
+ c->current_const[i].reg = brw_vec8_grf(alloc_grf(c), 0);
}
}
-#if 0
- printf("USE CONST BUFFER? %d\n", c->use_const_buffer);
- printf("AFTER PRE_ALLOC, reg_index = %d\n", c->reg_index);
-#endif
}
struct brw_compile *p = &c->func;
struct brw_indirect stack_index = brw_indirect(0, 0);
- c->reg_index = 0;
prealloc_reg(c);
brw_set_compression_control(p, BRW_COMPRESSION_NONE);
brw_MOV(p, get_addr_reg(stack_index), brw_address(c->stack));
for (i = 0; i < c->nr_fp_insns; i++) {
const struct prog_instruction *inst = &c->prog_instructions[i];
+ c->cur_inst = i;
+
#if 0
_mesa_printf("Inst %d: ", i);
_mesa_print_instruction(inst);
_mesa_printf("unsupported IR in fragment shader %d\n",
inst->Opcode);
}
+
if (inst->CondUpdate)
brw_set_predicate_control(p, BRW_PREDICATE_NORMAL);
else
brw_set_predicate_control(p, BRW_PREDICATE_NONE);
}
post_wm_emit(c);
-
- if (c->reg_index >= BRW_WM_MAX_GRF) {
- _mesa_problem(NULL, "Ran out of registers in brw_wm_emit_glsl()");
- /* XXX we need to do some proper error recovery here */
- }
}
brw_wm_print_program(c, "brw_wm_glsl_emit done");
}
- c->prog_data.total_grf = c->reg_index;
+ c->prog_data.total_grf = num_grf_used(c);
c->prog_data.total_scratch = 0;
}
projects / mesa.git / commitdiff