radeonsi: Handle position input parameter for pixel shaders v2

v2:
  - Don't increment ninterp or set any of the have_* flags for
    TGSI_SEMANTIC_POSITION

Reviewed-by: Michel Dänzer <[email protected]>

2 files changed, 22 insertions, 0 deletions

diff --git a/src/gallium/drivers/radeon/SIInstructions.td b/src/gallium/drivers/radeon/SIInstructions.td
index 8f9de525340..ffc9537ea70 100644
--- a/src/gallium/drivers/radeon/SIInstructions.td
+++ b/src/gallium/drivers/radeon/SIInstructions.td
@@ -1102,6 +1102,26 @@ def : Pat <
              imm:$attr, SReg_32:$params)
 >;
 
+def : Pat <
+  (int_SI_fs_read_pos 0),
+  (f32 POS_X_FLOAT)
+>;
+
+def : Pat <
+  (int_SI_fs_read_pos 1),
+  (f32 POS_Y_FLOAT)
+>;
+
+def : Pat <
+  (int_SI_fs_read_pos 2),
+  (f32 POS_Z_FLOAT)
+>;
+
+def : Pat <
+  (int_SI_fs_read_pos 3),
+  (f32 POS_W_FLOAT)
+>;
+
 /********** ================== **********/
 /********** Intrinsic Patterns **********/
 /********** ================== **********/
diff --git a/src/gallium/drivers/radeon/SIIntrinsics.td b/src/gallium/drivers/radeon/SIIntrinsics.td
index fbb8dc90fbe..f5c3f76fe27 100644
--- a/src/gallium/drivers/radeon/SIIntrinsics.td
+++ b/src/gallium/drivers/radeon/SIIntrinsics.td
@@ -34,4 +34,6 @@ let TargetPrefix = "SI", isTarget = 1 in {
   def int_SI_fs_interp_persp_center : Interp;
   def int_SI_fs_interp_persp_centroid : Interp;
   def int_SI_fs_interp_constant : Interp;
+
+  def int_SI_fs_read_pos : Intrinsic <[llvm_float_ty], [llvm_i32_ty], [IntrNoMem]>;
 }