i965: Remove fixed_hw_reg field from backend_reg.

Since backend_reg now inherits brw_reg, we can use it in place of the
fixed_hw_reg field.

Reviewed-by: Emil Velikov <[email protected]>
Reviewed-by: Kenneth Graunke <[email protected]>

11 files changed, 139 insertions, 162 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 931a8fdbae2..c2d04d970e5 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -423,13 +423,15 @@ fs_reg::fs_reg(uint8_t vf0, uint8_t vf1, uint8_t vf2, uint8_t vf3)
                                (vf3 << 24);
 }
 
-/** Fixed brw_reg. */
-fs_reg::fs_reg(struct brw_reg fixed_hw_reg)
+fs_reg::fs_reg(struct brw_reg reg) :
+   backend_reg(reg)
 {
-   init();
    this->file = HW_REG;
-   this->fixed_hw_reg = fixed_hw_reg;
-   this->type = fixed_hw_reg.type;
+   this->reg = 0;
+   this->reg_offset = 0;
+   this->subreg_offset = 0;
+   this->reladdr = NULL;
+   this->stride = 1;
 }
 
 bool
@@ -444,8 +446,7 @@ fs_reg::equals(const fs_reg &r) const
            abs == r.abs &&
            !reladdr && !r.reladdr &&
            (file != HW_REG ||
-            memcmp(&fixed_hw_reg, &r.fixed_hw_reg,
-                   sizeof(fixed_hw_reg)) == 0) &&
+            memcmp((brw_reg *)this, (brw_reg *)&r, sizeof(brw_reg)) == 0) &&
            (file != IMM || d == r.d) &&
            stride == r.stride);
 }
@@ -469,8 +470,8 @@ unsigned
 fs_reg::component_size(unsigned width) const
 {
    const unsigned stride = (file != HW_REG ? this->stride :
-                            fixed_hw_reg.hstride == 0 ? 0 :
-                            1 << (fixed_hw_reg.hstride - 1));
+                            hstride == 0 ? 0 :
+                            1 << (hstride - 1));
    return MAX2(width * stride, 1) * type_sz(type);
 }
 
@@ -961,7 +962,6 @@ fs_visitor::vgrf(const glsl_type *const type)
                  brw_type_for_base_type(type));
 }
 
-/** Fixed HW reg constructor. */
 fs_reg::fs_reg(enum register_file file, int reg)
 {
    init();
@@ -971,7 +971,6 @@ fs_reg::fs_reg(enum register_file file, int reg)
    this->stride = (file == UNIFORM ? 0 : 1);
 }
 
-/** Fixed HW reg constructor. */
 fs_reg::fs_reg(enum register_file file, int reg, enum brw_reg_type type)
 {
    init();
@@ -1476,10 +1475,11 @@ fs_visitor::assign_curb_setup()
 	    struct brw_reg brw_reg = brw_vec1_grf(payload.num_regs +
 						  constant_nr / 8,
 						  constant_nr % 8);
+            brw_reg.abs = inst->src[i].abs;
+            brw_reg.negate = inst->src[i].negate;
 
             assert(inst->src[i].stride == 0);
-	    inst->src[i].file = HW_REG;
-	    inst->src[i].fixed_hw_reg = byte_offset(
+            inst->src[i] = byte_offset(
                retype(brw_reg, inst->src[i].type),
                inst->src[i].subreg_offset);
 	 }
@@ -1595,12 +1595,12 @@ fs_visitor::assign_urb_setup()
    foreach_block_and_inst(block, fs_inst, inst, cfg) {
       if (inst->opcode == FS_OPCODE_LINTERP) {
 	 assert(inst->src[1].file == HW_REG);
-	 inst->src[1].fixed_hw_reg.nr += urb_start;
+         inst->src[1].nr += urb_start;
       }
 
       if (inst->opcode == FS_OPCODE_CINTERP) {
 	 assert(inst->src[0].file == HW_REG);
-	 inst->src[0].fixed_hw_reg.nr += urb_start;
+         inst->src[0].nr += urb_start;
       }
    }
 
@@ -1618,12 +1618,15 @@ fs_visitor::convert_attr_sources_to_hw_regs(fs_inst *inst)
                    inst->src[i].reg +
                    inst->src[i].reg_offset;
 
-         inst->src[i].file = HW_REG;
-         inst->src[i].fixed_hw_reg =
+         struct brw_reg reg =
             stride(byte_offset(retype(brw_vec8_grf(grf, 0), inst->src[i].type),
                                inst->src[i].subreg_offset),
                    inst->exec_size * inst->src[i].stride,
                    inst->exec_size, inst->src[i].stride);
+         reg.abs = inst->src[i].abs;
+         reg.negate = inst->src[i].negate;
+
+         inst->src[i] = reg;
       }
    }
 }
@@ -2793,7 +2796,7 @@ fs_visitor::emit_repclear_shader()
 
    /* Now that we have the uniform assigned, go ahead and force it to a vec4. */
    assert(mov->src[0].file == HW_REG);
-   mov->src[0] = brw_vec4_grf(mov->src[0].fixed_hw_reg.nr, 0);
+   mov->src[0] = brw_vec4_grf(mov->src[0].nr, 0);
 }
 
 /**
@@ -2874,8 +2877,8 @@ clear_deps_for_inst_src(fs_inst *inst, bool *deps, int first_grf, int grf_len)
       if (inst->src[i].file == GRF) {
          grf = inst->src[i].reg;
       } else if (inst->src[i].file == HW_REG &&
-                 inst->src[i].fixed_hw_reg.file == BRW_GENERAL_REGISTER_FILE) {
-         grf = inst->src[i].fixed_hw_reg.nr;
+                 inst->src[i].brw_reg::file == BRW_GENERAL_REGISTER_FILE) {
+         grf = inst->src[i].nr;
       } else {
          continue;
       }
@@ -4627,31 +4630,31 @@ fs_visitor::dump_instruction(backend_instruction *be_inst, FILE *file)
       fprintf(file, "***attr%d***", inst->dst.reg + inst->dst.reg_offset);
       break;
    case HW_REG:
-      if (inst->dst.fixed_hw_reg.file == BRW_ARCHITECTURE_REGISTER_FILE) {
-         switch (inst->dst.fixed_hw_reg.nr) {
+      if (inst->dst.brw_reg::file == BRW_ARCHITECTURE_REGISTER_FILE) {
+         switch (inst->dst.nr) {
          case BRW_ARF_NULL:
             fprintf(file, "null");
             break;
          case BRW_ARF_ADDRESS:
-            fprintf(file, "a0.%d", inst->dst.fixed_hw_reg.subnr);
+            fprintf(file, "a0.%d", inst->dst.subnr);
             break;
          case BRW_ARF_ACCUMULATOR:
-            fprintf(file, "acc%d", inst->dst.fixed_hw_reg.subnr);
+            fprintf(file, "acc%d", inst->dst.subnr);
             break;
          case BRW_ARF_FLAG:
-            fprintf(file, "f%d.%d", inst->dst.fixed_hw_reg.nr & 0xf,
-                             inst->dst.fixed_hw_reg.subnr);
+            fprintf(file, "f%d.%d", inst->dst.nr & 0xf,
+                             inst->dst.subnr);
             break;
          default:
-            fprintf(file, "arf%d.%d", inst->dst.fixed_hw_reg.nr & 0xf,
-                               inst->dst.fixed_hw_reg.subnr);
+            fprintf(file, "arf%d.%d", inst->dst.nr & 0xf,
+                               inst->dst.subnr);
             break;
          }
       } else {
-         fprintf(file, "hw_reg%d", inst->dst.fixed_hw_reg.nr);
+         fprintf(file, "hw_reg%d", inst->dst.nr);
       }
-      if (inst->dst.fixed_hw_reg.subnr)
-         fprintf(file, "+%d", inst->dst.fixed_hw_reg.subnr);
+      if (inst->dst.subnr)
+         fprintf(file, "+%d", inst->dst.subnr);
       break;
    case IMM:
       unreachable("not reached");
@@ -4715,37 +4718,31 @@ fs_visitor::dump_instruction(backend_instruction *be_inst, FILE *file)
          }
          break;
       case HW_REG:
-         if (inst->src[i].fixed_hw_reg.negate)
-            fprintf(file, "-");
-         if (inst->src[i].fixed_hw_reg.abs)
-            fprintf(file, "|");
-         if (inst->src[i].fixed_hw_reg.file == BRW_ARCHITECTURE_REGISTER_FILE) {
-            switch (inst->src[i].fixed_hw_reg.nr) {
+         if (inst->src[i].brw_reg::file == BRW_ARCHITECTURE_REGISTER_FILE) {
+            switch (inst->src[i].nr) {
             case BRW_ARF_NULL:
                fprintf(file, "null");
                break;
             case BRW_ARF_ADDRESS:
-               fprintf(file, "a0.%d", inst->src[i].fixed_hw_reg.subnr);
+               fprintf(file, "a0.%d", inst->src[i].subnr);
                break;
             case BRW_ARF_ACCUMULATOR:
-               fprintf(file, "acc%d", inst->src[i].fixed_hw_reg.subnr);
+               fprintf(file, "acc%d", inst->src[i].subnr);
                break;
             case BRW_ARF_FLAG:
-               fprintf(file, "f%d.%d", inst->src[i].fixed_hw_reg.nr & 0xf,
-                                inst->src[i].fixed_hw_reg.subnr);
+               fprintf(file, "f%d.%d", inst->src[i].nr & 0xf,
+                                inst->src[i].subnr);
                break;
             default:
-               fprintf(file, "arf%d.%d", inst->src[i].fixed_hw_reg.nr & 0xf,
-                                  inst->src[i].fixed_hw_reg.subnr);
+               fprintf(file, "arf%d.%d", inst->src[i].nr & 0xf,
+                                  inst->src[i].subnr);
                break;
             }
          } else {
-            fprintf(file, "hw_reg%d", inst->src[i].fixed_hw_reg.nr);
+            fprintf(file, "hw_reg%d", inst->src[i].nr);
          }
-         if (inst->src[i].fixed_hw_reg.subnr)
-            fprintf(file, "+%d", inst->src[i].fixed_hw_reg.subnr);
-         if (inst->src[i].fixed_hw_reg.abs)
-            fprintf(file, "|");
+         if (inst->src[i].subnr)
+            fprintf(file, "+%d", inst->src[i].subnr);
          break;
       }
       if (inst->src[i].abs)
diff --git a/src/mesa/drivers/dri/i965/brw_fs_generator.cpp b/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
index 9dd574cd14f..6b6b5771298 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_generator.cpp
@@ -84,6 +84,8 @@ brw_reg_from_fs_reg(fs_inst *inst, fs_reg *reg, unsigned gen)
 
       brw_reg = retype(brw_reg, reg->type);
       brw_reg = byte_offset(brw_reg, reg->subreg_offset);
+      brw_reg.abs = reg->abs;
+      brw_reg.negate = reg->negate;
       break;
    case IMM:
       assert(reg->stride == ((reg->type == BRW_REGISTER_TYPE_V ||
@@ -114,8 +116,7 @@ brw_reg_from_fs_reg(fs_inst *inst, fs_reg *reg, unsigned gen)
       }
       break;
    case HW_REG:
-      assert(reg->type == reg->fixed_hw_reg.type);
-      brw_reg = reg->fixed_hw_reg;
+      brw_reg = *static_cast<struct brw_reg *>(reg);
       break;
    case BAD_FILE:
       /* Probably unused. */
@@ -125,10 +126,6 @@ brw_reg_from_fs_reg(fs_inst *inst, fs_reg *reg, unsigned gen)
    case UNIFORM:
       unreachable("not reached");
    }
-   if (reg->abs)
-      brw_reg = brw_abs(brw_reg);
-   if (reg->negate)
-      brw_reg = negate(brw_reg);
 
    return brw_reg;
 }
diff --git a/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp b/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
index 9251d9552a5..3e0e0e9586b 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_reg_allocate.cpp
@@ -372,8 +372,8 @@ void fs_visitor::calculate_payload_ranges(int payload_node_count,
        */
       for (int i = 0; i < inst->sources; i++) {
          if (inst->src[i].file == HW_REG &&
-             inst->src[i].fixed_hw_reg.file == BRW_GENERAL_REGISTER_FILE) {
-            int node_nr = inst->src[i].fixed_hw_reg.nr;
+             inst->src[i].brw_reg::file == BRW_GENERAL_REGISTER_FILE) {
+            int node_nr = inst->src[i].nr;
             if (node_nr >= payload_node_count)
                continue;
 
diff --git a/src/mesa/drivers/dri/i965/brw_ir_fs.h b/src/mesa/drivers/dri/i965/brw_ir_fs.h
index c0e486e5edc..1f2931af179 100644
--- a/src/mesa/drivers/dri/i965/brw_ir_fs.h
+++ b/src/mesa/drivers/dri/i965/brw_ir_fs.h
@@ -41,7 +41,7 @@ public:
    explicit fs_reg(uint32_t u);
    explicit fs_reg(uint8_t vf[4]);
    explicit fs_reg(uint8_t vf0, uint8_t vf1, uint8_t vf2, uint8_t vf3);
-   fs_reg(struct brw_reg fixed_hw_reg);
+   fs_reg(struct brw_reg reg);
    fs_reg(enum register_file file, int reg);
    fs_reg(enum register_file file, int reg, enum brw_reg_type type);
 
@@ -80,7 +80,7 @@ negate(fs_reg reg)
 static inline fs_reg
 retype(fs_reg reg, enum brw_reg_type type)
 {
-   reg.fixed_hw_reg.type = reg.type = type;
+   reg.type = type;
    return reg;
 }
 
diff --git a/src/mesa/drivers/dri/i965/brw_ir_vec4.h b/src/mesa/drivers/dri/i965/brw_ir_vec4.h
index 2fbb043f244..0b2a9258f25 100644
--- a/src/mesa/drivers/dri/i965/brw_ir_vec4.h
+++ b/src/mesa/drivers/dri/i965/brw_ir_vec4.h
@@ -63,7 +63,7 @@ public:
 static inline src_reg
 retype(src_reg reg, enum brw_reg_type type)
 {
-   reg.fixed_hw_reg.type = reg.type = type;
+   reg.type = type;
    return reg;
 }
 
@@ -130,7 +130,7 @@ public:
 static inline dst_reg
 retype(dst_reg reg, enum brw_reg_type type)
 {
-   reg.fixed_hw_reg.type = reg.type = type;
+   reg.type = type;
    return reg;
 }
 
diff --git a/src/mesa/drivers/dri/i965/brw_schedule_instructions.cpp b/src/mesa/drivers/dri/i965/brw_schedule_instructions.cpp
index d21bc677c82..521d04ec17e 100644
--- a/src/mesa/drivers/dri/i965/brw_schedule_instructions.cpp
+++ b/src/mesa/drivers/dri/i965/brw_schedule_instructions.cpp
@@ -586,12 +586,12 @@ fs_instruction_scheduler::count_reads_remaining(backend_instruction *be)
       if (inst->src[i].file == GRF) {
          reads_remaining[inst->src[i].reg]++;
       } else if (inst->src[i].file == HW_REG &&
-               inst->src[i].fixed_hw_reg.file == BRW_GENERAL_REGISTER_FILE) {
-         if (inst->src[i].fixed_hw_reg.nr >= hw_reg_count)
+                 inst->src[i].brw_reg::file == BRW_GENERAL_REGISTER_FILE) {
+         if (inst->src[i].nr >= hw_reg_count)
             continue;
 
          for (int j = 0; j < inst->regs_read(i); j++)
-            hw_reads_remaining[inst->src[i].fixed_hw_reg.nr + j]++;
+            hw_reads_remaining[inst->src[i].nr + j]++;
       }
    }
 }
@@ -671,10 +671,10 @@ fs_instruction_scheduler::update_register_pressure(backend_instruction *be)
       if (inst->src[i].file == GRF) {
          reads_remaining[inst->src[i].reg]--;
       } else if (inst->src[i].file == HW_REG &&
-                 inst->src[i].fixed_hw_reg.file == BRW_GENERAL_REGISTER_FILE &&
-                 inst->src[i].fixed_hw_reg.nr < hw_reg_count) {
+                 inst->src[i].brw_reg::file == BRW_GENERAL_REGISTER_FILE &&
+                 inst->src[i].nr < hw_reg_count) {
          for (int off = 0; off < inst->regs_read(i); off++)
-            hw_reads_remaining[inst->src[i].fixed_hw_reg.nr + off]--;
+            hw_reads_remaining[inst->src[i].nr + off]--;
       }
    }
 }
@@ -701,10 +701,10 @@ fs_instruction_scheduler::get_register_pressure_benefit(backend_instruction *be)
          benefit += v->alloc.sizes[inst->src[i].reg];
 
       if (inst->src[i].file == HW_REG &&
-          inst->src[i].fixed_hw_reg.file == BRW_GENERAL_REGISTER_FILE &&
-          inst->src[i].fixed_hw_reg.nr < hw_reg_count) {
+          inst->src[i].brw_reg::file == BRW_GENERAL_REGISTER_FILE &&
+          inst->src[i].nr < hw_reg_count) {
          for (int off = 0; off < inst->regs_read(i); off++) {
-            int reg = inst->src[i].fixed_hw_reg.nr + off;
+            int reg = inst->src[i].nr + off;
             if (!BITSET_TEST(hw_liveout[block_idx], reg) &&
                 hw_reads_remaining[reg] == 1) {
                benefit++;
@@ -960,11 +960,11 @@ fs_instruction_scheduler::calculate_deps()
                }
             }
          } else if (inst->src[i].file == HW_REG &&
-                    (inst->src[i].fixed_hw_reg.file ==
+                    (inst->src[i].brw_reg::file ==
                      BRW_GENERAL_REGISTER_FILE)) {
             if (post_reg_alloc) {
                for (int r = 0; r < inst->regs_read(i); r++)
-                  add_dep(last_grf_write[inst->src[i].fixed_hw_reg.nr + r], n);
+                  add_dep(last_grf_write[inst->src[i].nr + r], n);
             } else {
                add_dep(last_fixed_grf_write, n);
             }
@@ -974,7 +974,7 @@ fs_instruction_scheduler::calculate_deps()
                     inst->src[i].file != IMM &&
                     inst->src[i].file != UNIFORM &&
                     (inst->src[i].file != HW_REG ||
-                     inst->src[i].fixed_hw_reg.file != BRW_IMMEDIATE_VALUE)) {
+                     inst->src[i].brw_reg::file != BRW_IMMEDIATE_VALUE)) {
             assert(inst->src[i].file != MRF);
             add_barrier_deps(n);
          }
@@ -1025,10 +1025,10 @@ fs_instruction_scheduler::calculate_deps()
             last_mrf_write[reg] = n;
          }
       } else if (inst->dst.file == HW_REG &&
-                 inst->dst.fixed_hw_reg.file == BRW_GENERAL_REGISTER_FILE) {
+                 inst->dst.brw_reg::file == BRW_GENERAL_REGISTER_FILE) {
          if (post_reg_alloc) {
             for (int r = 0; r < inst->regs_written; r++)
-               last_grf_write[inst->dst.fixed_hw_reg.nr + r] = n;
+               last_grf_write[inst->dst.nr + r] = n;
          } else {
             last_fixed_grf_write = n;
          }
@@ -1086,11 +1086,11 @@ fs_instruction_scheduler::calculate_deps()
                }
             }
          } else if (inst->src[i].file == HW_REG &&
-                    (inst->src[i].fixed_hw_reg.file ==
+                    (inst->src[i].brw_reg::file ==
                      BRW_GENERAL_REGISTER_FILE)) {
             if (post_reg_alloc) {
                for (int r = 0; r < inst->regs_read(i); r++)
-                  add_dep(n, last_grf_write[inst->src[i].fixed_hw_reg.nr + r], 0);
+                  add_dep(n, last_grf_write[inst->src[i].nr + r], 0);
             } else {
                add_dep(n, last_fixed_grf_write, 0);
             }
@@ -1100,7 +1100,7 @@ fs_instruction_scheduler::calculate_deps()
                     inst->src[i].file != IMM &&
                     inst->src[i].file != UNIFORM &&
                     (inst->src[i].file != HW_REG ||
-                     inst->src[i].fixed_hw_reg.file != BRW_IMMEDIATE_VALUE)) {
+                     inst->src[i].brw_reg::file != BRW_IMMEDIATE_VALUE)) {
             assert(inst->src[i].file != MRF);
             add_barrier_deps(n);
          }
@@ -1150,10 +1150,10 @@ fs_instruction_scheduler::calculate_deps()
             last_mrf_write[reg] = n;
          }
       } else if (inst->dst.file == HW_REG &&
-                 inst->dst.fixed_hw_reg.file == BRW_GENERAL_REGISTER_FILE) {
+                 inst->dst.brw_reg::file == BRW_GENERAL_REGISTER_FILE) {
          if (post_reg_alloc) {
             for (int r = 0; r < inst->regs_written; r++)
-               last_grf_write[inst->dst.fixed_hw_reg.nr + r] = n;
+               last_grf_write[inst->dst.nr + r] = n;
          } else {
             last_fixed_grf_write = n;
          }
@@ -1219,7 +1219,7 @@ vec4_instruction_scheduler::calculate_deps()
             for (unsigned j = 0; j < inst->regs_read(i); ++j)
                add_dep(last_grf_write[inst->src[i].reg + j], n);
          } else if (inst->src[i].file == HW_REG &&
-                    (inst->src[i].fixed_hw_reg.file ==
+                    (inst->src[i].brw_reg::file ==
                      BRW_GENERAL_REGISTER_FILE)) {
             add_dep(last_fixed_grf_write, n);
          } else if (inst->src[i].is_accumulator()) {
@@ -1229,7 +1229,7 @@ vec4_instruction_scheduler::calculate_deps()
                     inst->src[i].file != IMM &&
                     inst->src[i].file != UNIFORM &&
                     (inst->src[i].file != HW_REG ||
-                     inst->src[i].fixed_hw_reg.file != BRW_IMMEDIATE_VALUE)) {
+                     inst->src[i].brw_reg::file != BRW_IMMEDIATE_VALUE)) {
             /* No reads from MRF, and ATTR is already translated away */
             assert(inst->src[i].file != MRF &&
                    inst->src[i].file != ATTR);
@@ -1267,7 +1267,7 @@ vec4_instruction_scheduler::calculate_deps()
          add_dep(last_mrf_write[inst->dst.reg], n);
          last_mrf_write[inst->dst.reg] = n;
      } else if (inst->dst.file == HW_REG &&
-                 inst->dst.fixed_hw_reg.file == BRW_GENERAL_REGISTER_FILE) {
+                 inst->dst.brw_reg::file == BRW_GENERAL_REGISTER_FILE) {
          last_fixed_grf_write = n;
       } else if (inst->dst.is_accumulator()) {
          add_dep(last_accumulator_write, n);
@@ -1317,7 +1317,7 @@ vec4_instruction_scheduler::calculate_deps()
             for (unsigned j = 0; j < inst->regs_read(i); ++j)
                add_dep(n, last_grf_write[inst->src[i].reg + j]);
          } else if (inst->src[i].file == HW_REG &&
-                    (inst->src[i].fixed_hw_reg.file ==
+                    (inst->src[i].brw_reg::file ==
                      BRW_GENERAL_REGISTER_FILE)) {
             add_dep(n, last_fixed_grf_write);
          } else if (inst->src[i].is_accumulator()) {
@@ -1326,7 +1326,7 @@ vec4_instruction_scheduler::calculate_deps()
                     inst->src[i].file != IMM &&
                     inst->src[i].file != UNIFORM &&
                     (inst->src[i].file != HW_REG ||
-                     inst->src[i].fixed_hw_reg.file != BRW_IMMEDIATE_VALUE)) {
+                     inst->src[i].brw_reg::file != BRW_IMMEDIATE_VALUE)) {
             assert(inst->src[i].file != MRF &&
                    inst->src[i].file != ATTR);
             add_barrier_deps(n);
@@ -1360,7 +1360,7 @@ vec4_instruction_scheduler::calculate_deps()
       } else if (inst->dst.file == MRF) {
          last_mrf_write[inst->dst.reg] = n;
       } else if (inst->dst.file == HW_REG &&
-                 inst->dst.fixed_hw_reg.file == BRW_GENERAL_REGISTER_FILE) {
+                 inst->dst.brw_reg::file == BRW_GENERAL_REGISTER_FILE) {
          last_fixed_grf_write = n;
       } else if (inst->dst.is_accumulator()) {
          last_accumulator_write = n;
diff --git a/src/mesa/drivers/dri/i965/brw_shader.cpp b/src/mesa/drivers/dri/i965/brw_shader.cpp
index ce0019ff6f9..ca7db9a73ac 100644
--- a/src/mesa/drivers/dri/i965/brw_shader.cpp
+++ b/src/mesa/drivers/dri/i965/brw_shader.cpp
@@ -734,8 +734,8 @@ bool
 backend_reg::is_null() const
 {
    return file == HW_REG &&
-          fixed_hw_reg.file == BRW_ARCHITECTURE_REGISTER_FILE &&
-          fixed_hw_reg.nr == BRW_ARF_NULL;
+          brw_reg::file == BRW_ARCHITECTURE_REGISTER_FILE &&
+          nr == BRW_ARF_NULL;
 }
 
 
@@ -743,8 +743,8 @@ bool
 backend_reg::is_accumulator() const
 {
    return file == HW_REG &&
-          fixed_hw_reg.file == BRW_ARCHITECTURE_REGISTER_FILE &&
-          fixed_hw_reg.nr == BRW_ARF_ACCUMULATOR;
+          brw_reg::file == BRW_ARCHITECTURE_REGISTER_FILE &&
+          nr == BRW_ARF_ACCUMULATOR;
 }
 
 bool
diff --git a/src/mesa/drivers/dri/i965/brw_shader.h b/src/mesa/drivers/dri/i965/brw_shader.h
index 3f435e2b728..086ab607c52 100644
--- a/src/mesa/drivers/dri/i965/brw_shader.h
+++ b/src/mesa/drivers/dri/i965/brw_shader.h
@@ -51,6 +51,9 @@ enum PACKED register_file {
 #ifdef __cplusplus
 struct backend_reg : public brw_reg
 {
+   backend_reg() {}
+   backend_reg(struct brw_reg reg) : brw_reg(reg) {}
+
    bool is_zero() const;
    bool is_one() const;
    bool is_negative_one() const;
@@ -79,8 +82,6 @@ struct backend_reg : public brw_reg
     * For uniforms, this is in units of 1 float.
     */
    uint16_t reg_offset;
-
-   struct brw_reg fixed_hw_reg;
 };
 #endif
 
diff --git a/src/mesa/drivers/dri/i965/brw_vec4.cpp b/src/mesa/drivers/dri/i965/brw_vec4.cpp
index 1cb43c3c1f2..9155c2e811d 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4.cpp
@@ -119,25 +119,23 @@ src_reg::src_reg(uint8_t vf0, uint8_t vf1, uint8_t vf2, uint8_t vf3)
                                (vf3 << 24);
 }
 
-src_reg::src_reg(struct brw_reg reg)
+src_reg::src_reg(struct brw_reg reg) :
+   backend_reg(reg)
 {
-   init();
-
    this->file = HW_REG;
-   this->fixed_hw_reg = reg;
-   this->type = reg.type;
+   this->reg = 0;
+   this->reg_offset = 0;
+   this->swizzle = BRW_SWIZZLE_XXXX;
+   this->reladdr = NULL;
 }
 
-src_reg::src_reg(const dst_reg &reg)
+src_reg::src_reg(const dst_reg &reg) :
+   backend_reg(static_cast<struct brw_reg>(reg))
 {
-   init();
-
    this->file = reg.file;
    this->reg = reg.reg;
    this->reg_offset = reg.reg_offset;
-   this->type = reg.type;
    this->reladdr = reg.reladdr;
-   this->fixed_hw_reg = reg.fixed_hw_reg;
    this->swizzle = brw_swizzle_for_mask(reg.writemask);
 }
 
@@ -184,26 +182,24 @@ dst_reg::dst_reg(register_file file, int reg, brw_reg_type type,
    this->writemask = writemask;
 }
 
-dst_reg::dst_reg(struct brw_reg reg)
+dst_reg::dst_reg(struct brw_reg reg) :
+   backend_reg(reg)
 {
-   init();
-
    this->file = HW_REG;
-   this->fixed_hw_reg = reg;
-   this->type = reg.type;
+   this->reg = 0;
+   this->reg_offset = 0;
+   this->writemask = WRITEMASK_XYZW;
+   this->reladdr = NULL;
 }
 
-dst_reg::dst_reg(const src_reg &reg)
+dst_reg::dst_reg(const src_reg &reg) :
+   backend_reg(static_cast<struct brw_reg>(reg))
 {
-   init();
-
    this->file = reg.file;
    this->reg = reg.reg;
    this->reg_offset = reg.reg_offset;
-   this->type = reg.type;
    this->writemask = brw_mask_for_swizzle(reg.swizzle);
    this->reladdr = reg.reladdr;
-   this->fixed_hw_reg = reg.fixed_hw_reg;
 }
 
 bool
@@ -219,8 +215,7 @@ dst_reg::equals(const dst_reg &r) const
            (reladdr == r.reladdr ||
             (reladdr && r.reladdr && reladdr->equals(*r.reladdr))) &&
            (file != HW_REG ||
-            memcmp(&fixed_hw_reg, &r.fixed_hw_reg,
-                   sizeof(fixed_hw_reg)) == 0));
+            memcmp((brw_reg *)this, (brw_reg *)&r, sizeof(brw_reg)) == 0));
 }
 
 bool
@@ -364,8 +359,7 @@ src_reg::equals(const src_reg &r) const
 	   swizzle == r.swizzle &&
 	   !reladdr && !r.reladdr &&
            (file != HW_REG ||
-            memcmp(&fixed_hw_reg, &r.fixed_hw_reg,
-                   sizeof(fixed_hw_reg)) == 0) &&
+            memcmp((brw_reg *)this, (brw_reg *)&r, sizeof(brw_reg)) == 0) &&
            (file != IMM || d == r.d));
 }
 
@@ -969,9 +963,9 @@ vec4_visitor::opt_set_dependency_control()
             last_mrf_write[reg] = inst;
             mrf_channels_written[reg] |= inst->dst.writemask;
          } else if (inst->dst.reg == HW_REG) {
-            if (inst->dst.fixed_hw_reg.file == BRW_GENERAL_REGISTER_FILE)
+            if (inst->dst.brw_reg::file == BRW_GENERAL_REGISTER_FILE)
                memset(last_grf_write, 0, sizeof(last_grf_write));
-            if (inst->dst.fixed_hw_reg.file == BRW_MESSAGE_REGISTER_FILE)
+            if (inst->dst.brw_reg::file == BRW_MESSAGE_REGISTER_FILE)
                memset(last_mrf_write, 0, sizeof(last_mrf_write));
          }
       }
@@ -1400,31 +1394,31 @@ vec4_visitor::dump_instruction(backend_instruction *be_inst, FILE *file)
       fprintf(file, "m%d", inst->dst.reg);
       break;
    case HW_REG:
-      if (inst->dst.fixed_hw_reg.file == BRW_ARCHITECTURE_REGISTER_FILE) {
-         switch (inst->dst.fixed_hw_reg.nr) {
+      if (inst->dst.brw_reg::file == BRW_ARCHITECTURE_REGISTER_FILE) {
+         switch (inst->dst.nr) {
          case BRW_ARF_NULL:
             fprintf(file, "null");
             break;
          case BRW_ARF_ADDRESS:
-            fprintf(file, "a0.%d", inst->dst.fixed_hw_reg.subnr);
+            fprintf(file, "a0.%d", inst->dst.subnr);
             break;
          case BRW_ARF_ACCUMULATOR:
-            fprintf(file, "acc%d", inst->dst.fixed_hw_reg.subnr);
+            fprintf(file, "acc%d", inst->dst.subnr);
             break;
          case BRW_ARF_FLAG:
-            fprintf(file, "f%d.%d", inst->dst.fixed_hw_reg.nr & 0xf,
-                             inst->dst.fixed_hw_reg.subnr);
+            fprintf(file, "f%d.%d", inst->dst.nr & 0xf,
+                             inst->dst.subnr);
             break;
          default:
-            fprintf(file, "arf%d.%d", inst->dst.fixed_hw_reg.nr & 0xf,
-                               inst->dst.fixed_hw_reg.subnr);
+            fprintf(file, "arf%d.%d", inst->dst.nr & 0xf,
+                               inst->dst.subnr);
             break;
          }
       } else {
-         fprintf(file, "hw_reg%d", inst->dst.fixed_hw_reg.nr);
+         fprintf(file, "hw_reg%d", inst->dst.nr);
       }
-      if (inst->dst.fixed_hw_reg.subnr)
-         fprintf(file, "+%d", inst->dst.fixed_hw_reg.subnr);
+      if (inst->dst.subnr)
+         fprintf(file, "+%d", inst->dst.subnr);
       break;
    case BAD_FILE:
       fprintf(file, "(null)");
@@ -1489,37 +1483,31 @@ vec4_visitor::dump_instruction(backend_instruction *be_inst, FILE *file)
          }
          break;
       case HW_REG:
-         if (inst->src[i].fixed_hw_reg.negate)
-            fprintf(file, "-");
-         if (inst->src[i].fixed_hw_reg.abs)
-            fprintf(file, "|");
-         if (inst->src[i].fixed_hw_reg.file == BRW_ARCHITECTURE_REGISTER_FILE) {
-            switch (inst->src[i].fixed_hw_reg.nr) {
+         if (inst->src[i].brw_reg::file == BRW_ARCHITECTURE_REGISTER_FILE) {
+            switch (inst->src[i].nr) {
             case BRW_ARF_NULL:
                fprintf(file, "null");
                break;
             case BRW_ARF_ADDRESS:
-               fprintf(file, "a0.%d", inst->src[i].fixed_hw_reg.subnr);
+               fprintf(file, "a0.%d", inst->src[i].subnr);
                break;
             case BRW_ARF_ACCUMULATOR:
-               fprintf(file, "acc%d", inst->src[i].fixed_hw_reg.subnr);
+               fprintf(file, "acc%d", inst->src[i].subnr);
                break;
             case BRW_ARF_FLAG:
-               fprintf(file, "f%d.%d", inst->src[i].fixed_hw_reg.nr & 0xf,
-                                inst->src[i].fixed_hw_reg.subnr);
+               fprintf(file, "f%d.%d", inst->src[i].nr & 0xf,
+                                inst->src[i].subnr);
                break;
             default:
-               fprintf(file, "arf%d.%d", inst->src[i].fixed_hw_reg.nr & 0xf,
-                                  inst->src[i].fixed_hw_reg.subnr);
+               fprintf(file, "arf%d.%d", inst->src[i].nr & 0xf,
+                                  inst->src[i].subnr);
                break;
             }
          } else {
-            fprintf(file, "hw_reg%d", inst->src[i].fixed_hw_reg.nr);
+            fprintf(file, "hw_reg%d", inst->src[i].nr);
          }
-         if (inst->src[i].fixed_hw_reg.subnr)
-            fprintf(file, "+%d", inst->src[i].fixed_hw_reg.subnr);
-         if (inst->src[i].fixed_hw_reg.abs)
-            fprintf(file, "|");
+         if (inst->src[i].subnr)
+            fprintf(file, "+%d", inst->src[i].subnr);
          break;
       case BAD_FILE:
          fprintf(file, "(null)");
@@ -1600,8 +1588,7 @@ vec4_visitor::lower_attributes_to_hw_regs(const int *attribute_map,
 	 reg.type = inst->dst.type;
 	 reg.writemask = inst->dst.writemask;
 
-	 inst->dst.file = HW_REG;
-	 inst->dst.fixed_hw_reg = reg;
+         inst->dst = reg;
       }
 
       for (int i = 0; i < 3; i++) {
@@ -1623,8 +1610,7 @@ vec4_visitor::lower_attributes_to_hw_regs(const int *attribute_map,
 	 if (inst->src[i].negate)
 	    reg = negate(reg);
 
-	 inst->src[i].file = HW_REG;
-	 inst->src[i].fixed_hw_reg = reg;
+         inst->src[i] = reg;
       }
    }
 }
@@ -1836,7 +1822,6 @@ vec4_visitor::convert_to_hw_regs()
             break;
 
          case HW_REG:
-            assert(src.type == src.fixed_hw_reg.type);
             continue;
 
          case BAD_FILE:
@@ -1848,7 +1833,7 @@ vec4_visitor::convert_to_hw_regs()
          case ATTR:
             unreachable("not reached");
          }
-         src.fixed_hw_reg = reg;
+         src = reg;
       }
 
       dst_reg &dst = inst->dst;
@@ -1869,8 +1854,7 @@ vec4_visitor::convert_to_hw_regs()
          break;
 
       case HW_REG:
-         assert(dst.type == dst.fixed_hw_reg.type);
-         reg = dst.fixed_hw_reg;
+         reg = dst;
          break;
 
       case BAD_FILE:
@@ -1883,7 +1867,7 @@ vec4_visitor::convert_to_hw_regs()
          unreachable("not reached");
       }
 
-      dst.fixed_hw_reg = reg;
+      dst = reg;
    }
 }
 
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_generator.cpp b/src/mesa/drivers/dri/i965/brw_vec4_generator.cpp
index 74d67cb0820..20107ac2054 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_generator.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_generator.cpp
@@ -356,7 +356,7 @@ generate_gs_urb_write_allocate(struct brw_codegen *p, vec4_instruction *inst)
 
    /* We pass the temporary passed in src0 as the writeback register */
    brw_urb_WRITE(p,
-                 inst->src[0].fixed_hw_reg, /* dest */
+                 inst->src[0], /* dest */
                  inst->base_mrf, /* starting mrf reg nr */
                  src,
                  BRW_URB_WRITE_ALLOCATE_COMPLETE,
@@ -369,8 +369,8 @@ generate_gs_urb_write_allocate(struct brw_codegen *p, vec4_instruction *inst)
    brw_push_insn_state(p);
    brw_set_default_access_mode(p, BRW_ALIGN_1);
    brw_set_default_mask_control(p, BRW_MASK_DISABLE);
-   brw_MOV(p, get_element_ud(inst->dst.fixed_hw_reg, 0),
-           get_element_ud(inst->src[0].fixed_hw_reg, 0));
+   brw_MOV(p, get_element_ud(inst->dst, 0),
+           get_element_ud(inst->src[0], 0));
    brw_pop_insn_state(p);
 }
 
@@ -1059,9 +1059,9 @@ generate_code(struct brw_codegen *p,
          annotate(p->devinfo, &annotation, cfg, inst, p->next_insn_offset);
 
       for (unsigned int i = 0; i < 3; i++) {
-	 src[i] = inst->src[i].fixed_hw_reg;
+         src[i] = inst->src[i];
       }
-      dst = inst->dst.fixed_hw_reg;
+      dst = inst->dst;
 
       brw_set_default_predicate_control(p, inst->predicate);
       brw_set_default_predicate_inverse(p, inst->predicate_inverse);
@@ -1241,7 +1241,7 @@ generate_code(struct brw_codegen *p,
          break;
 
       case BRW_OPCODE_IF:
-         if (inst->src[0].file != BAD_FILE) {
+         if (!inst->src[0].is_null()) {
             /* The instruction has an embedded compare (only allowed on gen6) */
             assert(devinfo->gen == 6);
             gen6_IF(p, inst->conditional_mod, src[0], src[1]);
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
index ecabedfe614..7b11ac1675d 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
@@ -237,8 +237,6 @@ vec4_visitor::CMP(dst_reg dst, src_reg src0, src_reg src1,
     * type to match src0 so we can compact the instruction.
     */
    dst.type = src0.type;
-   if (dst.file == HW_REG)
-      dst.fixed_hw_reg.type = dst.type;
 
    resolve_ud_negate(&src0);
    resolve_ud_negate(&src1);