i965/fs: Allow CSE on math opcodes on Gen6+.

total instructions in shared programs: 2081469 -> 2081248 (-0.01%)
instructions in affected programs:     22606 -> 22385 (-0.98%)
No programs were hurt by this patch.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>

diff --git a/src/mesa/drivers/dri/i965/brw_fs_cse.cpp b/src/mesa/drivers/dri/i965/brw_fs_cse.cpp
index 94f657d..e0e3935 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_fs_cse.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_cse.cpp
@@ -73,6 +73,17 @@ is_expression(const fs_inst *const inst)
    case FS_OPCODE_CINTERP:
    case FS_OPCODE_LINTERP:
       return true;
+   case SHADER_OPCODE_RCP:
+   case SHADER_OPCODE_RSQ:
+   case SHADER_OPCODE_SQRT:
+   case SHADER_OPCODE_EXP2:
+   case SHADER_OPCODE_LOG2:
+   case SHADER_OPCODE_POW:
+   case SHADER_OPCODE_INT_QUOTIENT:
+   case SHADER_OPCODE_INT_REMAINDER:
+   case SHADER_OPCODE_SIN:
+   case SHADER_OPCODE_COS:
+      return inst->mlen == 0;
    default:
       return false;
    }