From aec1f8e4f8315df23dc51a0b5a5fad90a03be851 Mon Sep 17 00:00:00 2001
From: Brian <brian.paul@tungstengraphics.com>
Date: Tue, 9 Oct 2007 14:40:11 -0600
Subject: More work on flow control for CAL/RET.

---
 src/mesa/pipe/tgsi/exec/tgsi_exec.c | 37 +++++++++++++++++++++++++------------
 src/mesa/pipe/tgsi/exec/tgsi_exec.h |  6 ++++++
 2 files changed, 31 insertions(+), 12 deletions(-)

diff --git a/src/mesa/pipe/tgsi/exec/tgsi_exec.c b/src/mesa/pipe/tgsi/exec/tgsi_exec.c
index 52848a2a73..6bbff76a87 100644
--- a/src/mesa/pipe/tgsi/exec/tgsi_exec.c
+++ b/src/mesa/pipe/tgsi/exec/tgsi_exec.c
@@ -109,7 +109,7 @@
 
 /** The execution mask depends on the conditional mask and the loop mask */
 #define UPDATE_EXEC_MASK(MACH) \
-      MACH->ExecMask = MACH->CondMask & MACH->LoopMask & MACH->ContMask
+      MACH->ExecMask = MACH->CondMask & MACH->LoopMask & MACH->ContMask & MACH->FuncMask
 
 
 #define CHAN_X  0
@@ -2044,6 +2044,9 @@ exec_instruction(
          assert(mach->ContStackTop < TGSI_EXEC_MAX_LOOP_NESTING);
          mach->ContStack[mach->ContStackTop++] = mach->ContMask;
 
+         assert(mach->FuncStackTop < TGSI_EXEC_MAX_CALL_NESTING);
+         mach->FuncStack[mach->FuncStackTop++] = mach->FuncMask;
+
          /* note that PC was already incremented above */
          mach->CallStack[mach->CallStackTop++] = *pc;
          *pc = inst->InstructionExtLabel.Label;
@@ -2053,19 +2056,28 @@ exec_instruction(
    case TGSI_OPCODE_RET:
       /* XXX examine ExecMask to determine if we should _really_ return */
       /* pop Cond, Loop, Cont stacks */
-      assert(mach->CondStackTop > 0);
-      mach->CondMask = mach->CondStack[--mach->CondStackTop];
-      assert(mach->LoopStackTop > 0);
-      mach->LoopMask = mach->LoopStack[--mach->LoopStackTop];
-      assert(mach->ContStackTop > 0);
-      mach->ContMask = mach->ContStack[--mach->ContStackTop];
+      mach->FuncMask &= ~mach->ExecMask;
+      UPDATE_EXEC_MASK(mach);
 
-      assert(mach->CallStackTop >= 0);
-      if (mach->CallStackTop == 0) {
-         /* XXX error? */
-         return;
+      if (mach->ExecMask == 0x0) {
+         /* really return now (otherwise, keep executing */
+         assert(mach->CondStackTop > 0);
+         mach->CondMask = mach->CondStack[--mach->CondStackTop];
+         assert(mach->LoopStackTop > 0);
+         mach->LoopMask = mach->LoopStack[--mach->LoopStackTop];
+         assert(mach->ContStackTop > 0);
+         mach->ContMask = mach->ContStack[--mach->ContStackTop];
+
+         assert(mach->FuncStackTop > 0);
+         mach->FuncMask = mach->FuncStack[--mach->FuncStackTop];
+
+         assert(mach->CallStackTop >= 0);
+         if (mach->CallStackTop == 0) {
+            /* XXX error? */
+            return;
+         }
+         *pc = mach->CallStack[--mach->CallStackTop];
       }
-      *pc = mach->CallStack[--mach->CallStackTop];
       break;
 
    case TGSI_OPCODE_SSG:
@@ -2387,6 +2399,7 @@ tgsi_exec_machine_run( struct tgsi_exec_machine *mach )
    mach->CondMask = 0xf;
    mach->LoopMask = 0xf;
    mach->ContMask = 0xf;
+   mach->FuncMask = 0xf;
    mach->ExecMask = 0xf;
 
    assert(mach->CondStackTop == 0);
diff --git a/src/mesa/pipe/tgsi/exec/tgsi_exec.h b/src/mesa/pipe/tgsi/exec/tgsi_exec.h
index 354d5df6c2..20647e72e2 100644
--- a/src/mesa/pipe/tgsi/exec/tgsi_exec.h
+++ b/src/mesa/pipe/tgsi/exec/tgsi_exec.h
@@ -141,6 +141,7 @@ struct tgsi_exec_machine
    uint CondMask;  /**< For IF/ELSE/ENDIF */
    uint LoopMask;  /**< For BGNLOOP/ENDLOOP */
    uint ContMask;  /**< For loop CONT statements */
+   uint FuncMask;  /**< For function calls */
    uint ExecMask;  /**< = CondMask & LoopMask */
 
    /** Condition mask stack (for nested conditionals) */
@@ -155,6 +156,11 @@ struct tgsi_exec_machine
    uint ContStack[TGSI_EXEC_MAX_LOOP_NESTING];
    int ContStackTop;
 
+   /** Function execution mask stack (for executing subroutine code) */
+   uint FuncStack[TGSI_EXEC_MAX_CALL_NESTING];
+   int FuncStackTop;
+
+   /** Function call stack for saving/restoring the program counter */
    uint CallStack[TGSI_EXEC_MAX_CALL_NESTING];
    int CallStackTop;
 
-- 
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