r600: don't reschedule INTERP_LOAD_P0

With the NIR code, we have instructions groups that use
INTERP_LOAD_P0 that don't fill all slots. Just make sure
the backend scheduler doesn't fill in INTERP_LOAD_P0
instructions with a different LDS location.

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Acked-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15714>

diff --git a/src/gallium/drivers/r600/r600_asm.c b/src/gallium/drivers/r600/r600_asm.c
index bce21ab..565c657 100644 (file)
--- a/src/gallium/drivers/r600/r600_asm.c
+++ b/src/gallium/drivers/r600/r600_asm.c
@@ -817,6 +817,8 @@ static int merge_inst_groups(struct r600_bytecode *bc, struct r600_bytecode_alu
                      if (is_alu_once_inst(prev[i]))
                              return 0;
 
+                      if (prev[i]->op == ALU_OP1_INTERP_LOAD_P0)
+                         interp_xz |= 3;
                       if (prev[i]->op == ALU_OP2_INTERP_X)
                          interp_xz |= 1;
                       if (prev[i]->op == ALU_OP2_INTERP_Z)
@@ -827,6 +829,8 @@ static int merge_inst_groups(struct r600_bytecode *bc, struct r600_bytecode_alu
                                return 0;
                        if (is_alu_once_inst(slots[i]))
                                return 0;
+                        if (slots[i]->op == ALU_OP1_INTERP_LOAD_P0)
+                           interp_xz |= 3;
                         if (slots[i]->op == ALU_OP2_INTERP_X)
                            interp_xz |= 1;
                         if (slots[i]->op == ALU_OP2_INTERP_Z)