nv50: make LRP instruction nicer

diff --git a/src/gallium/drivers/nv50/nv50_program.c b/src/gallium/drivers/nv50/nv50_program.c
index a33ec5997a3968ababfdabace8ae0a2ff3668de4..6aec9cc8414e3bb66f62fed08bd59ef64e92de41 100644 (file)
--- a/src/gallium/drivers/nv50/nv50_program.c
+++ b/src/gallium/drivers/nv50/nv50_program.c
@@ -1117,15 +1117,12 @@ nv50_program_tx_insn(struct nv50_pc *pc, const union tgsi_full_token *tok)
                }
                break;
        case TGSI_OPCODE_LRP:
+               temp = temp_temp(pc);
                for (c = 0; c < 4; c++) {
                        if (!(mask & (1 << c)))
                                continue;
-                       /*XXX: we can do better than this */
-                       temp = alloc_temp(pc, NULL);
-                       emit_neg(pc, temp, src[0][c]);
-                       emit_mad(pc, temp, temp, src[2][c], src[2][c]);
-                       emit_mad(pc, dst[c], src[0][c], src[1][c], temp);
-                       free_temp(pc, temp);
+                       emit_sub(pc, temp, src[1][c], src[2][c]);
+                       emit_mad(pc, dst[c], temp, src[0][c], src[2][c]);
                }
                break;
        case TGSI_OPCODE_MAD: