gallivm: Add a new debug flag to warn about performance issues.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c b/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c
index 1f39d9c98b5..93cbf159aa4 100644
--- a/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c
+++ b/src/gallium/auxiliary/gallivm/lp_bld_sample_soa.c
@@ -2203,6 +2203,16 @@ lp_build_sample_soa(LLVMBuilderRef builder,
                                     row_stride_array, data_array, texel_out);
    }
    else {
+      if (gallivm_debug & GALLIVM_DEBUG_PERF &&
+          bld.format_desc->nr_channels > 1 &&
+          (static_state->min_img_filter != PIPE_TEX_FILTER_NEAREST ||
+           static_state->mag_img_filter != PIPE_TEX_FILTER_NEAREST ||
+           static_state->min_mip_filter == PIPE_TEX_MIPFILTER_LINEAR) &&
+          util_format_fits_8unorm(bld.format_desc)) {
+         debug_printf("%s: using floating point linear filtering for %s\n",
+                      __FUNCTION__, bld.format_desc->short_name);
+      }
+
       lp_build_sample_general(&bld, unit, s, t, r, ddx, ddy,
                               lod_bias, explicit_lod,
                               width, height, depth,