From 0c54d76f3783091267cb18e6bd23697d024c95b2 Mon Sep 17 00:00:00 2001
From: Michal Krol <michal@vmware.com>
Date: Tue, 24 Nov 2009 09:03:41 +0100
Subject: [PATCH] tgsi: Implement predicated instructions in exec.

---
 src/gallium/auxiliary/tgsi/tgsi_exec.c | 52 +++++++++++++++++++++++---
 src/gallium/auxiliary/tgsi/tgsi_exec.h |  1 +
 2 files changed, 48 insertions(+), 5 deletions(-)

diff --git a/src/gallium/auxiliary/tgsi/tgsi_exec.c b/src/gallium/auxiliary/tgsi/tgsi_exec.c
index af914f6d089..89740cee897 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_exec.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_exec.c
@@ -369,6 +369,7 @@ tgsi_exec_machine_create( void )
    memset(mach, 0, sizeof(*mach));
 
    mach->Addrs = &mach->Temps[TGSI_EXEC_TEMP_ADDR];
+   mach->Predicates = &mach->Temps[TGSI_EXEC_TEMP_P0];
 
    /* Setup constants. */
    for( i = 0; i < 4; i++ ) {
@@ -1194,10 +1195,10 @@ fetch_src_file_channel(
          assert(index->i[1] < TGSI_EXEC_NUM_PREDS);
          assert(index->i[2] < TGSI_EXEC_NUM_PREDS);
          assert(index->i[3] < TGSI_EXEC_NUM_PREDS);
-         chan->u[0] = mach->Addrs[0].xyzw[swizzle].u[0];
-         chan->u[1] = mach->Addrs[0].xyzw[swizzle].u[1];
-         chan->u[2] = mach->Addrs[0].xyzw[swizzle].u[2];
-         chan->u[3] = mach->Addrs[0].xyzw[swizzle].u[3];
+         chan->u[0] = mach->Predicates[0].xyzw[swizzle].u[0];
+         chan->u[1] = mach->Predicates[0].xyzw[swizzle].u[1];
+         chan->u[2] = mach->Predicates[0].xyzw[swizzle].u[2];
+         chan->u[3] = mach->Predicates[0].xyzw[swizzle].u[3];
          break;
 
       case TGSI_FILE_OUTPUT:
@@ -1489,7 +1490,7 @@ store_dest(
    case TGSI_FILE_PREDICATE:
       index = reg->DstRegister.Index;
       assert(index < TGSI_EXEC_NUM_PREDS);
-      dst = &mach->Addrs[index].xyzw[chan_index];
+      dst = &mach->Predicates[index].xyzw[chan_index];
       break;
 
    default:
@@ -1497,6 +1498,47 @@ store_dest(
       return;
    }
 
+   if (inst->Instruction.Predicate) {
+      uint swizzle;
+      union tgsi_exec_channel *pred;
+
+      switch (chan_index) {
+      case CHAN_X:
+         swizzle = inst->InstructionPredicate.SwizzleX;
+         break;
+      case CHAN_Y:
+         swizzle = inst->InstructionPredicate.SwizzleY;
+         break;
+      case CHAN_Z:
+         swizzle = inst->InstructionPredicate.SwizzleZ;
+         break;
+      case CHAN_W:
+         swizzle = inst->InstructionPredicate.SwizzleW;
+         break;
+      default:
+         assert(0);
+         return;
+      }
+
+      assert(inst->InstructionPredicate.Index == 0);
+
+      pred = &mach->Predicates[inst->InstructionPredicate.Index].xyzw[swizzle];
+
+      if (inst->InstructionPredicate.Negate) {
+         for (i = 0; i < QUAD_SIZE; i++) {
+            if (pred->u[i]) {
+               execmask &= ~(1 << i);
+            }
+         }
+      } else {
+         for (i = 0; i < QUAD_SIZE; i++) {
+            if (!pred->u[i]) {
+               execmask &= ~(1 << i);
+            }
+         }
+      }
+   }
+
    switch (inst->Instruction.Saturate) {
    case TGSI_SAT_NONE:
       for (i = 0; i < QUAD_SIZE; i++)
diff --git a/src/gallium/auxiliary/tgsi/tgsi_exec.h b/src/gallium/auxiliary/tgsi/tgsi_exec.h
index 3dff69a5059..fd94c1bc440 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_exec.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_exec.h
@@ -218,6 +218,7 @@ struct tgsi_exec_machine
    struct tgsi_exec_vector       Outputs[PIPE_MAX_ATTRIBS];
 
    struct tgsi_exec_vector       *Addrs;
+   struct tgsi_exec_vector       *Predicates;
 
    struct tgsi_sampler           **Samplers;