i965/fs: Replace fs_inst::regs_written with ::size_written field in bytes.

The previous regs_written field can be recovered by rewriting each
rvalue reference of regs_written like 'x = i.regs_written' to 'x =
DIV_ROUND_UP(i.size_written, reg_unit)', and each lvalue reference
like 'i.regs_written = x' to 'i.size_written = x * reg_unit'.

For the same reason as in the previous patches, this doesn't attempt
to be particularly clever about simplifying the result in the interest
of keeping the rather lengthy patch as obvious as possible.  I'll come
back later to clean up any ugliness introduced here.

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>

1 files changed, 37 insertions, 36 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 802aa9f..0244f59 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -76,11 +76,10 @@ fs_inst::init(enum opcode opcode, uint8_t exec_size, const fs_reg &dst,
    case FIXED_GRF:
    case MRF:
    case ATTR:
-      this->regs_written = DIV_ROUND_UP(dst.component_size(exec_size),
-                                        REG_SIZE);
+      this->size_written = dst.component_size(exec_size);
       break;
    case BAD_FILE:
-      this->regs_written = 0;
+      this->size_written = 0;
       break;
    case IMM:
    case UNIFORM:
@@ -192,7 +191,7 @@ fs_visitor::VARYING_PULL_CONSTANT_LOAD(const fs_builder &bld,
    fs_reg vec4_result = bld.vgrf(BRW_REGISTER_TYPE_F, 4);
    fs_inst *inst = bld.emit(FS_OPCODE_VARYING_PULL_CONSTANT_LOAD_LOGICAL,
                             vec4_result, surf_index, vec4_offset);
-   inst->regs_written = 4 * bld.dispatch_width() / 8;
+   inst->size_written = 4 * bld.dispatch_width() / 8 * REG_SIZE;
 
    if (type_sz(dst.type) == 8) {
       shuffle_32bit_load_result_to_64bit_data(
@@ -244,7 +243,7 @@ fs_inst::equals(fs_inst *inst) const
 bool
 fs_inst::overwrites_reg(const fs_reg &reg) const
 {
-   return reg.in_range(dst, regs_written);
+   return reg.in_range(dst, DIV_ROUND_UP(size_written, REG_SIZE));
 }
 
 bool
@@ -357,7 +356,7 @@ fs_inst::is_copy_payload(const brw::simple_allocator &grf_alloc) const
    if (reg.file != VGRF || reg.offset / REG_SIZE != 0 || reg.stride == 0)
       return false;
 
-   if (grf_alloc.sizes[reg.nr] != this->regs_written)
+   if (grf_alloc.sizes[reg.nr] * REG_SIZE != this->size_written)
       return false;
 
    for (int i = 0; i < this->sources; i++) {
@@ -2548,7 +2547,7 @@ fs_visitor::opt_sampler_eot()
    for (unsigned i = 0; i < FB_WRITE_LOGICAL_NUM_SRCS; i++) {
       if (i == FB_WRITE_LOGICAL_SRC_COLOR0) {
          if (!fb_write->src[i].equals(tex_inst->dst) ||
-             fb_write->regs_read(i) != tex_inst->regs_written)
+             fb_write->regs_read(i) * REG_SIZE != tex_inst->size_written)
          return false;
       } else if (i != FB_WRITE_LOGICAL_SRC_COMPONENTS) {
          if (fb_write->src[i].file != BAD_FILE)
@@ -2564,7 +2563,7 @@ fs_visitor::opt_sampler_eot()
    tex_inst->offset |= fb_write->target << 24;
    tex_inst->eot = true;
    tex_inst->dst = ibld.null_reg_ud();
-   tex_inst->regs_written = 0;
+   tex_inst->size_written = 0;
    fb_write->remove(cfg->blocks[cfg->num_blocks - 1]);
 
    /* Marking EOT is sufficient, lower_logical_sends() will notice the EOT
@@ -2606,7 +2605,7 @@ fs_visitor::opt_register_renaming()
 
       if (depth == 0 &&
           inst->dst.file == VGRF &&
-          alloc.sizes[inst->dst.nr] == inst->regs_written &&
+          alloc.sizes[inst->dst.nr] * REG_SIZE == inst->size_written &&
           !inst->is_partial_write()) {
          if (remap[dst] == -1) {
             remap[dst] = dst;
@@ -2730,7 +2729,7 @@ fs_visitor::compute_to_mrf()
       unsigned regs_left = (1 << regs_read(inst, 0)) - 1;
 
       foreach_inst_in_block_reverse_starting_from(fs_inst, scan_inst, inst) {
-         if (regions_overlap(scan_inst->dst, scan_inst->regs_written * REG_SIZE,
+         if (regions_overlap(scan_inst->dst, scan_inst->size_written,
                              inst->src[0], inst->regs_read(0) * REG_SIZE)) {
 	    /* Found the last thing to write our reg we want to turn
 	     * into a compute-to-MRF.
@@ -2749,7 +2748,7 @@ fs_visitor::compute_to_mrf()
              * a time.
              */
             if (scan_inst->dst.offset / REG_SIZE < inst->src[0].offset / REG_SIZE ||
-                scan_inst->dst.offset / REG_SIZE + scan_inst->regs_written >
+                scan_inst->dst.offset / REG_SIZE + DIV_ROUND_UP(scan_inst->size_written, REG_SIZE) >
                 inst->src[0].offset / REG_SIZE + inst->regs_read(0))
                break;
 
@@ -2768,7 +2767,8 @@ fs_visitor::compute_to_mrf()
 
             /* Clear the bits for any registers this instruction overwrites. */
             regs_left &= ~mask_relative_to(
-               inst->src[0], scan_inst->dst, scan_inst->regs_written);
+               inst->src[0], scan_inst->dst, DIV_ROUND_UP(scan_inst->size_written,
+                                                          REG_SIZE));
             if (!regs_left)
                break;
 	 }
@@ -2793,8 +2793,8 @@ fs_visitor::compute_to_mrf()
 	 if (interfered)
 	    break;
 
-         if (regions_overlap(scan_inst->dst, scan_inst->regs_written * REG_SIZE,
-                             inst->dst, inst->regs_written * REG_SIZE)) {
+         if (regions_overlap(scan_inst->dst, scan_inst->size_written,
+                             inst->dst, inst->size_written)) {
 	    /* If somebody else writes our MRF here, we can't
 	     * compute-to-MRF before that.
 	     */
@@ -2803,7 +2803,7 @@ fs_visitor::compute_to_mrf()
 
          if (scan_inst->mlen > 0 && scan_inst->base_mrf != -1 &&
              regions_overlap(fs_reg(MRF, scan_inst->base_mrf), scan_inst->mlen * REG_SIZE,
-                             inst->dst, inst->regs_written * REG_SIZE)) {
+                             inst->dst, inst->size_written)) {
 	    /* Found a SEND instruction, which means that there are
 	     * live values in MRFs from base_mrf to base_mrf +
 	     * scan_inst->mlen - 1.  Don't go pushing our MRF write up
@@ -2822,11 +2822,12 @@ fs_visitor::compute_to_mrf()
       regs_left = (1 << regs_read(inst, 0)) - 1;
 
       foreach_inst_in_block_reverse_starting_from(fs_inst, scan_inst, inst) {
-         if (regions_overlap(scan_inst->dst, scan_inst->regs_written * REG_SIZE,
+         if (regions_overlap(scan_inst->dst, scan_inst->size_written,
                              inst->src[0], inst->regs_read(0) * REG_SIZE)) {
             /* Clear the bits for any registers this instruction overwrites. */
             regs_left &= ~mask_relative_to(
-               inst->src[0], scan_inst->dst, scan_inst->regs_written);
+               inst->src[0], scan_inst->dst, DIV_ROUND_UP(scan_inst->size_written,
+                                                          REG_SIZE));
 
             const unsigned rel_offset = (reg_offset(scan_inst->dst) -
                                          reg_offset(inst->src[0])) / REG_SIZE;
@@ -2841,7 +2842,7 @@ fs_visitor::compute_to_mrf()
                /* Clear the COMPR4 bit if the generating instruction is not
                 * compressed.
                 */
-               if (scan_inst->regs_written < 2)
+               if (scan_inst->size_written < 2 * REG_SIZE)
                   scan_inst->dst.nr &= ~BRW_MRF_COMPR4;
 
             } else {
@@ -3024,7 +3025,7 @@ fs_visitor::remove_duplicate_mrf_writes()
       /* Clear out any MRF move records whose sources got overwritten. */
       for (unsigned i = 0; i < ARRAY_SIZE(last_mrf_move); i++) {
          if (last_mrf_move[i] &&
-             regions_overlap(inst->dst, inst->regs_written * REG_SIZE,
+             regions_overlap(inst->dst, inst->size_written,
                              last_mrf_move[i]->src[0],
                              last_mrf_move[i]->regs_read(0) * REG_SIZE)) {
             last_mrf_move[i] = NULL;
@@ -4603,7 +4604,7 @@ get_fpu_lowered_simd_width(const struct gen_device_info *devinfo,
     * which is the one that is going to limit the overall execution size of
     * the instruction due to this rule.
     */
-   unsigned reg_count = inst->regs_written;
+   unsigned reg_count = DIV_ROUND_UP(inst->size_written, REG_SIZE);
 
    for (unsigned i = 0; i < inst->sources; i++)
       reg_count = MAX2(reg_count, (unsigned)inst->regs_read(i));
@@ -4630,13 +4631,14 @@ get_fpu_lowered_simd_width(const struct gen_device_info *devinfo,
     */
    if (devinfo->gen < 8) {
       for (unsigned i = 0; i < inst->sources; i++) {
-         if (inst->regs_written == 2 &&
+         if (DIV_ROUND_UP(inst->size_written, REG_SIZE) == 2 &&
              inst->regs_read(i) != 0 && inst->regs_read(i) != 2 &&
              !is_uniform(inst->src[i]) &&
              !(type_sz(inst->dst.type) == 4 && inst->dst.stride == 1 &&
-               type_sz(inst->src[i].type) == 2 && inst->src[i].stride == 1))
-            max_width = MIN2(max_width, inst->exec_size /
-                             inst->regs_written);
+               type_sz(inst->src[i].type) == 2 && inst->src[i].stride == 1)) {
+            const unsigned reg_count = DIV_ROUND_UP(inst->size_written, REG_SIZE);
+            max_width = MIN2(max_width, inst->exec_size / reg_count);
+         }
       }
    }
 
@@ -4681,9 +4683,10 @@ get_fpu_lowered_simd_width(const struct gen_device_info *devinfo,
     * In this situation we calculate the maximum size of the split
     * instructions so they only ever write to a single register.
     */
-   if (devinfo->gen < 8 && inst->regs_written > 1 &&
+   if (devinfo->gen < 8 && inst->size_written > REG_SIZE &&
        !inst->force_writemask_all) {
-      const unsigned channels_per_grf = inst->exec_size / inst->regs_written;
+      const unsigned channels_per_grf = inst->exec_size /
+         DIV_ROUND_UP(inst->size_written, REG_SIZE);
       unsigned exec_type_size = 0;
       for (int i = 0; i < inst->sources; i++) {
          if (inst->src[i].file != BAD_FILE)
@@ -5087,8 +5090,7 @@ needs_dst_copy(const fs_builder &lbld, const fs_inst *inst)
     * the results of multiple lowered instructions in order to make sure that
     * they end up arranged correctly in the original destination region.
     */
-   if (inst->regs_written * REG_SIZE >
-       inst->dst.component_size(inst->exec_size))
+   if (inst->size_written > inst->dst.component_size(inst->exec_size))
       return true;
 
    /* If the lowered execution size is larger than the original the result of
@@ -5111,7 +5113,7 @@ needs_dst_copy(const fs_builder &lbld, const fs_inst *inst)
        * group which could cause one of the lowered instructions to overwrite
        * the data read from the same source by other lowered instructions.
        */
-      if (regions_overlap(inst->dst, inst->regs_written * REG_SIZE,
+      if (regions_overlap(inst->dst, inst->size_written,
                           inst->src[i], inst->regs_read(i) * REG_SIZE) &&
           !inst->dst.equals(inst->src[i]))
         return true;
@@ -5138,8 +5140,8 @@ emit_zip(const fs_builder &lbld, bblock_t *block, fs_inst *inst)
 
    /* Specified channel group from the destination region. */
    const fs_reg dst = horiz_offset(inst->dst, lbld.group());
-   const unsigned dst_size = inst->regs_written * REG_SIZE /
-            inst->dst.component_size(inst->exec_size);
+   const unsigned dst_size = inst->size_written /
+      inst->dst.component_size(inst->exec_size);
 
    if (needs_dst_copy(lbld, inst)) {
       const fs_reg tmp = lbld.vgrf(inst->dst.type, dst_size);
@@ -5191,7 +5193,7 @@ fs_visitor::lower_simd_width()
           * original or the lowered instruction, whichever is lower.
           */
          const unsigned n = DIV_ROUND_UP(inst->exec_size, lower_width);
-         const unsigned dst_size = inst->regs_written * REG_SIZE /
+         const unsigned dst_size = inst->size_written /
             inst->dst.component_size(inst->exec_size);
 
          assert(!inst->writes_accumulator && !inst->mlen);
@@ -5215,9 +5217,8 @@ fs_visitor::lower_simd_width()
                split_inst.src[j] = emit_unzip(lbld, block, inst, j);
 
             split_inst.dst = emit_zip(lbld, block, inst);
-            split_inst.regs_written = DIV_ROUND_UP(
-               split_inst.dst.component_size(lower_width) * dst_size,
-               REG_SIZE);
+            split_inst.size_written =
+               split_inst.dst.component_size(lower_width) * dst_size;
 
             lbld.emit(split_inst);
          }
@@ -5314,7 +5315,7 @@ fs_visitor::dump_instruction(backend_instruction *be_inst, FILE *file)
    switch (inst->dst.file) {
    case VGRF:
       fprintf(file, "vgrf%d", inst->dst.nr);
-      if (alloc.sizes[inst->dst.nr] != inst->regs_written ||
+      if (alloc.sizes[inst->dst.nr] * REG_SIZE != inst->size_written ||
           inst->dst.offset % REG_SIZE)
          fprintf(file, "+%d.%d",
                  inst->dst.offset / REG_SIZE, inst->dst.offset % REG_SIZE);