Mesa (master): i965/fs: Remove 'mul_arg' from try_emit_mad().

[Matt Turner]

Module: Mesa
Branch: master
Commit: 1e50bc9ee170b6a4c212c4fd8e019beb43a99603
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=1e50bc9ee170b6a4c212c4fd8e019beb43a99603

Author: Matt Turner <mattst88 at gmail.com>
Date:   Tue Apr  1 16:42:36 2014 -0700

i965/fs: Remove 'mul_arg' from try_emit_mad().

Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

---

 src/mesa/drivers/dri/i965/brw_fs.h           |    2 +-
 src/mesa/drivers/dri/i965/brw_fs_visitor.cpp |   17 +++++++++++------
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_fs.h b/src/mesa/drivers/dri/i965/brw_fs.h
index 2a1a81d..24d995b 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.h
+++ b/src/mesa/drivers/dri/i965/brw_fs.h
@@ -422,7 +422,7 @@ public:
    void emit_minmax(uint32_t conditionalmod, const fs_reg &dst,
                     const fs_reg &src0, const fs_reg &src1);
    bool try_emit_saturate(ir_expression *ir);
-   bool try_emit_mad(ir_expression *ir, int mul_arg);
+   bool try_emit_mad(ir_expression *ir);
    void try_replace_with_sel();
    bool opt_peephole_sel();
    bool opt_peephole_predicated_break();
diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index 2aa3acd..aa177cb 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -291,7 +291,7 @@ fs_visitor::try_emit_saturate(ir_expression *ir)
 }
 
 bool
-fs_visitor::try_emit_mad(ir_expression *ir, int mul_arg)
+fs_visitor::try_emit_mad(ir_expression *ir)
 {
    /* 3-src instructions were introduced in gen6. */
    if (brw->gen < 6)
@@ -301,11 +301,16 @@ fs_visitor::try_emit_mad(ir_expression *ir, int mul_arg)
    if (ir->type != glsl_type::float_type)
       return false;
 
-   ir_rvalue *nonmul = ir->operands[1 - mul_arg];
-   ir_expression *mul = ir->operands[mul_arg]->as_expression();
+   ir_rvalue *nonmul = ir->operands[1];
+   ir_expression *mul = ir->operands[0]->as_expression();
 
-   if (!mul || mul->operation != ir_binop_mul)
-      return false;
+   if (!mul || mul->operation != ir_binop_mul) {
+      nonmul = ir->operands[0];
+      mul = ir->operands[1]->as_expression();
+
+      if (!mul || mul->operation != ir_binop_mul)
+         return false;
+   }
 
    if (nonmul->as_constant() ||
        mul->operands[0]->as_constant() ||
@@ -339,7 +344,7 @@ fs_visitor::visit(ir_expression *ir)
    if (try_emit_saturate(ir))
       return;
    if (ir->operation == ir_binop_add) {
-      if (try_emit_mad(ir, 0) || try_emit_mad(ir, 1))
+      if (try_emit_mad(ir))
 	 return;
    }