Mesa (master): i965/fs: Add reads_flag() and writes_flag() to fs_inst.

[Matt Turner]

Module: Mesa
Branch: master
Commit: 20d0297ff2d507aab42e59ebfde375d5205642cb
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=20d0297ff2d507aab42e59ebfde375d5205642cb

Author: Matt Turner <mattst88 at gmail.com>
Date:   Sun Oct 20 11:32:01 2013 -0700

i965/fs: Add reads_flag() and writes_flag() to fs_inst.

Reviewed-by: Eric Anholt <eric at anholt.net>
Reviewed-by: Paul Berry <stereotype441 at gmail.com>

---

 src/mesa/drivers/dri/i965/brw_fs.cpp |   13 +++++++++++++
 src/mesa/drivers/dri/i965/brw_fs.h   |    3 +++
 2 files changed, 16 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 69340f0..236e86c 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -732,6 +732,19 @@ fs_inst::regs_read(fs_visitor *v, int arg)
    return 1;
 }
 
+bool
+fs_inst::reads_flag()
+{
+   return predicate;
+}
+
+bool
+fs_inst::writes_flag()
+{
+   return (conditional_mod && opcode != BRW_OPCODE_SEL) ||
+          opcode == FS_OPCODE_MOV_DISPATCH_TO_FLAGS;
+}
+
 /**
  * Returns how many MRFs an FS opcode will write over.
  *
diff --git a/src/mesa/drivers/dri/i965/brw_fs.h b/src/mesa/drivers/dri/i965/brw_fs.h
index c9b0aa1..43e4761 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.h
+++ b/src/mesa/drivers/dri/i965/brw_fs.h
@@ -151,6 +151,9 @@ public:
    bool is_partial_write();
    int regs_read(fs_visitor *v, int arg);
 
+   bool reads_flag();
+   bool writes_flag();
+
    fs_reg dst;
    fs_reg src[3];
    bool saturate;