i965: Recognize saturates and turn them into a saturated mov.

On pre-gen6, this turns 4 instructions into 1.  We could still do
better by folding the saturate into the instruction generating the
value if nobody else uses it, but that should be a separate pass.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_fs.h b/src/mesa/drivers/dri/i965/brw_fs.h
index 896dc57705..f546fabd55 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.h
+++ b/src/mesa/drivers/dri/i965/brw_fs.h
@@ -397,6 +397,7 @@ public:
    fs_inst *emit_texture_gen5(ir_texture *ir, fs_reg dst, fs_reg coordinate);
    fs_inst *emit_math(fs_opcodes op, fs_reg dst, fs_reg src0);
    fs_inst *emit_math(fs_opcodes op, fs_reg dst, fs_reg src0, fs_reg src1);
+   bool try_emit_saturate(ir_expression *ir);
    void emit_bool_to_cond_code(ir_rvalue *condition);
    void emit_if_gen6(ir_if *ir);
    void emit_unspill(fs_inst *inst, fs_reg reg, uint32_t spill_offset);