v3d: Use the NIR lowering for isign instead of rolling our own.

min/max instead of comparisons saves 2 instructions on
fs-sign-int.shader_test.

diff --git a/src/broadcom/compiler/nir_to_vir.c b/src/broadcom/compiler/nir_to_vir.c
index d983f91..41fc03a 100644 (file)
--- a/src/broadcom/compiler/nir_to_vir.c
+++ b/src/broadcom/compiler/nir_to_vir.c
@@ -547,19 +547,6 @@ ntq_fsign(struct v3d_compile *c, struct qreg src)
         return vir_MOV(c, t);
 }
 
-static struct qreg
-ntq_isign(struct v3d_compile *c, struct qreg src)
-{
-        struct qreg t = vir_get_temp(c);
-
-        vir_MOV_dest(c, t, vir_uniform_ui(c, 0));
-        vir_PF(c, vir_MOV(c, src), V3D_QPU_PF_PUSHZ);
-        vir_MOV_cond(c, V3D_QPU_COND_IFNA, t, vir_uniform_ui(c, 1));
-        vir_PF(c, vir_MOV(c, src), V3D_QPU_PF_PUSHN);
-        vir_MOV_cond(c, V3D_QPU_COND_IFA, t, vir_uniform_ui(c, -1));
-        return vir_MOV(c, t);
-}
-
 static void
 emit_fragcoord_input(struct v3d_compile *c, int attr)
 {
@@ -1025,9 +1012,6 @@ ntq_emit_alu(struct v3d_compile *c, nir_alu_instr *instr)
         case nir_op_fsign:
                 result = ntq_fsign(c, src[0]);
                 break;
-        case nir_op_isign:
-                result = ntq_isign(c, src[0]);
-                break;
 
         case nir_op_fabs: {
                 result = vir_FMOV(c, src[0]);
@@ -2476,6 +2460,7 @@ const nir_shader_compiler_options v3d_nir_options = {
         .lower_fsat = true,
         .lower_fsqrt = true,
         .lower_ifind_msb = true,
+        .lower_isign = true,
         .lower_ldexp = true,
         .lower_mul_high = true,
         .lower_wpos_pntc = true,