Mesa (master): glsl_to_tgsi: implement ir_unop_logic_not using 1-x

[Bryan Cain]

Module: Mesa
Branch: master
Commit: 8c31bc704826d46cad65c4d65b4b70de7144205a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=8c31bc704826d46cad65c4d65b4b70de7144205a

Author: Bryan Cain <bryancain3 at gmail.com>
Date:   Wed Aug 17 10:01:30 2011 -0500

glsl_to_tgsi: implement ir_unop_logic_not using 1-x

Since our logic values are 0.0 (false) and 1.0 (true), 1.0 - x accurately
implements logical not.

This is a port of commit 6ad08989d7c1 to glsl_to_tgsi.

---

 src/mesa/state_tracker/st_glsl_to_tgsi.cpp |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 886a177..73a647e 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -1336,7 +1336,17 @@ glsl_to_tgsi_visitor::visit(ir_expression *ir)
 
    switch (ir->operation) {
    case ir_unop_logic_not:
-      emit(ir, TGSI_OPCODE_SEQ, result_dst, op[0], st_src_reg_for_type(result_dst.type, 0));
+      if (result_dst.type != GLSL_TYPE_FLOAT)
+         emit(ir, TGSI_OPCODE_SEQ, result_dst, op[0], st_src_reg_for_type(result_dst.type, 0));
+      else {
+         /* Previously 'SEQ dst, src, 0.0' was used for this.  However, many
+          * older GPUs implement SEQ using multiple instructions (i915 uses two
+          * SGE instructions and a MUL instruction).  Since our logic values are
+          * 0.0 and 1.0, 1-x also implements !x.
+          */
+         op[0].negate = ~op[0].negate;
+         emit(ir, TGSI_OPCODE_ADD, result_dst, op[0], st_src_reg_for_float(1.0));
+      }
       break;
    case ir_unop_neg:
       assert(result_dst.type == GLSL_TYPE_FLOAT || result_dst.type == GLSL_TYPE_INT);