[Mesa-dev] [PATCH 11/57] i965/vec4: Replace vec4_instruction::regs_read with ::size_read using byte units.

[Francisco Jerez]

The previous regs_read value can be recovered by rewriting each
reference of regs_read() like 'x = i.regs_read(j)' to 'x =
DIV_ROUND_UP(i.size_read(j), 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.
---
 src/mesa/drivers/dri/i965/brw_ir_vec4.h            |  6 +++--
 src/mesa/drivers/dri/i965/brw_vec4.cpp             | 30 ++++++++++++++--------
 .../drivers/dri/i965/brw_vec4_copy_propagation.cpp |  2 +-
 3 files changed, 25 insertions(+), 13 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_ir_vec4.h b/src/mesa/drivers/dri/i965/brw_ir_vec4.h
index 5a79062..2fd5441 100644
--- a/src/mesa/drivers/dri/i965/brw_ir_vec4.h
+++ b/src/mesa/drivers/dri/i965/brw_ir_vec4.h
@@ -167,7 +167,7 @@ public:
    unsigned sol_vertex; /**< gen6: used for setting dst index in SVB header */
 
    bool is_send_from_grf();
-   unsigned regs_read(unsigned arg) const;
+   unsigned size_read(unsigned arg) const;
    bool can_reswizzle(const struct gen_device_info *devinfo, int dst_writemask,
                       int swizzle, int swizzle_mask);
    void reswizzle(int dst_writemask, int swizzle);
@@ -278,7 +278,9 @@ inline unsigned
 regs_read(const vec4_instruction *inst, unsigned i)
 {
    /* XXX - Take into account register-misaligned offsets correctly. */
-   return inst->regs_read(i);
+   const unsigned reg_size =
+      inst->src[i].file == UNIFORM || inst->src[i].file == IMM ? 16 : REG_SIZE;
+   return DIV_ROUND_UP(inst->size_read(i), reg_size);
 }
 
 } /* namespace brw */
diff --git a/src/mesa/drivers/dri/i965/brw_vec4.cpp b/src/mesa/drivers/dri/i965/brw_vec4.cpp
index bdd6e59..561170c 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4.cpp
@@ -199,11 +199,8 @@ vec4_instruction::has_source_and_destination_hazard() const
 }
 
 unsigned
-vec4_instruction::regs_read(unsigned arg) const
+vec4_instruction::size_read(unsigned arg) const
 {
-   if (src[arg].file == BAD_FILE)
-      return 0;
-
    switch (opcode) {
    case SHADER_OPCODE_SHADER_TIME_ADD:
    case SHADER_OPCODE_UNTYPED_ATOMIC:
@@ -213,13 +210,26 @@ vec4_instruction::regs_read(unsigned arg) const
    case SHADER_OPCODE_TYPED_SURFACE_READ:
    case SHADER_OPCODE_TYPED_SURFACE_WRITE:
    case TCS_OPCODE_URB_WRITE:
-      return arg == 0 ? mlen : 1;
-
+      if (arg == 0)
+         return mlen * REG_SIZE;
+      break;
    case VS_OPCODE_PULL_CONSTANT_LOAD_GEN7:
-      return arg == 1 ? mlen : 1;
+      if (arg == 1)
+         return mlen * REG_SIZE;
+      break;
+   default:
+      break;
+   }
 
+   switch (src[arg].file) {
+   case BAD_FILE:
+      return 0;
+   case IMM:
+   case UNIFORM:
+      return 4 * type_sz(src[arg].type);
    default:
-      return 1;
+      /* XXX - Represent actual execution size and vertical stride. */
+      return 8 * type_sz(src[arg].type);
    }
 }
 
@@ -1188,7 +1198,7 @@ vec4_visitor::opt_register_coalesce()
 	 bool interfered = false;
 	 for (int i = 0; i < 3; i++) {
             if (inst->src[0].in_range(scan_inst->src[i],
-                                      scan_inst->regs_read(i)))
+                                      DIV_ROUND_UP(scan_inst->size_read(i), REG_SIZE)))
 	       interfered = true;
 	 }
 	 if (interfered)
@@ -1214,7 +1224,7 @@ vec4_visitor::opt_register_coalesce()
          } else {
             for (int i = 0; i < 3; i++) {
                if (inst->dst.in_range(scan_inst->src[i],
-                                      scan_inst->regs_read(i)))
+                                      DIV_ROUND_UP(scan_inst->size_read(i), REG_SIZE)))
                   interfered = true;
             }
             if (interfered)
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp b/src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp
index f98c7ac..777d252 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_copy_propagation.cpp
@@ -437,7 +437,7 @@ vec4_visitor::opt_copy_propagation(bool do_constant_prop)
 	    continue;
 
          /* We only handle single-register copies. */
-         if (inst->regs_read(i) != 1)
+         if (inst->size_read(i) != REG_SIZE)
             continue;
 
          const unsigned reg = (alloc.offsets[inst->src[i].nr] +
-- 
2.9.0