Mesa (master): i965/vs: Do the temporary allocation in emit_scratch_write() .

[Eric Anholt]

Module: Mesa
Branch: master
Commit: af911b2819e5175008c67e6939d88ec28cda69d1
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=af911b2819e5175008c67e6939d88ec28cda69d1

Author: Eric Anholt <eric at anholt.net>
Date:   Mon Oct 15 17:48:07 2012 -0700

i965/vs: Do the temporary allocation in emit_scratch_write().

Both callers were doing basically the same thing, just written differently.

Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

---

 src/mesa/drivers/dri/i965/brw_vec4.h               |    1 -
 .../drivers/dri/i965/brw_vec4_reg_allocate.cpp     |   11 +---------
 src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp     |   21 ++++++++++---------
 3 files changed, 12 insertions(+), 21 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_vec4.h b/src/mesa/drivers/dri/i965/brw_vec4.h
index d6d6c8a..a647215 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.h
+++ b/src/mesa/drivers/dri/i965/brw_vec4.h
@@ -427,7 +427,6 @@ public:
 			  src_reg orig_src,
 			  int base_offset);
    void emit_scratch_write(vec4_instruction *inst,
-			   src_reg temp,
 			   int base_offset);
    void emit_pull_constant_load(vec4_instruction *inst,
 				dst_reg dst,
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_reg_allocate.cpp b/src/mesa/drivers/dri/i965/brw_vec4_reg_allocate.cpp
index a2381bc..ac3d401 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_reg_allocate.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_reg_allocate.cpp
@@ -346,16 +346,7 @@ vec4_visitor::spill_reg(int spill_reg_nr)
       }
 
       if (inst->dst.file == GRF && inst->dst.reg == spill_reg_nr) {
-         dst_reg spill_reg = inst->dst;
-         inst->dst.reg = virtual_grf_alloc(1);
-
-         /* We don't want a swizzle when reading from the source; read the
-          * whole register and use spill_reg's writemask to select which
-          * channels to write.
-          */
-         src_reg temp = src_reg(inst->dst);
-         temp.swizzle = BRW_SWIZZLE_XYZW;
-         emit_scratch_write(inst, temp, spill_offset);
+         emit_scratch_write(inst, spill_offset);
       }
    }
 
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
index 60295ad..310f347 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
@@ -2464,12 +2464,15 @@ vec4_visitor::emit_scratch_read(vec4_instruction *inst,
  * @base_offset is measured in 32-byte units (the size of a register).
  */
 void
-vec4_visitor::emit_scratch_write(vec4_instruction *inst,
-				 src_reg temp, int base_offset)
+vec4_visitor::emit_scratch_write(vec4_instruction *inst, int base_offset)
 {
    int reg_offset = base_offset + inst->dst.reg_offset;
    src_reg index = get_scratch_offset(inst, inst->dst.reladdr, reg_offset);
 
+   /* Create a temporary register to store *inst's result in. */
+   src_reg temp = src_reg(this, glsl_type::vec4_type);
+   temp.type = inst->dst.type;
+
    dst_reg dst = dst_reg(brw_writemask(brw_vec8_grf(0, 0),
 				       inst->dst.writemask));
    vec4_instruction *write = SCRATCH_WRITE(dst, temp, index);
@@ -2477,6 +2480,11 @@ vec4_visitor::emit_scratch_write(vec4_instruction *inst,
    write->ir = inst->ir;
    write->annotation = inst->annotation;
    inst->insert_after(write);
+
+   inst->dst.file = temp.file;
+   inst->dst.reg = temp.reg;
+   inst->dst.reg_offset = temp.reg_offset;
+   inst->dst.reladdr = NULL;
 }
 
 /**
@@ -2531,14 +2539,7 @@ vec4_visitor::move_grf_array_access_to_scratch()
       current_annotation = inst->annotation;
 
       if (inst->dst.file == GRF && scratch_loc[inst->dst.reg] != -1) {
-	 src_reg temp = src_reg(this, glsl_type::vec4_type);
-
-	 emit_scratch_write(inst, temp, scratch_loc[inst->dst.reg]);
-
-	 inst->dst.file = temp.file;
-	 inst->dst.reg = temp.reg;
-	 inst->dst.reg_offset = temp.reg_offset;
-	 inst->dst.reladdr = NULL;
+	 emit_scratch_write(inst, scratch_loc[inst->dst.reg]);
       }
 
       for (int i = 0 ; i < 3; i++) {