From: Tapani Pälli Date: Mon, 2 Dec 2019 14:54:30 +0000 (+0200) Subject: intel/compiler: force simd8 when dual src blending on gen8 X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=32ebd4207ad9411bc790b5e2c7e8d2a4f21c3d67;p=mesa.git intel/compiler: force simd8 when dual src blending on gen8 Patch introduces option to force simd8 and uses it as a workaround for dual source blending issues seen with skqp (skia testsuite) on gen8. Fixes following Piglit test on gen8 platforms: arb_blend_func_extended-dual-src-blending-issue-1917 Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/1917 Signed-off-by: Tapani Pälli c: Reviewed-by: Lionel Landwerlin --- diff --git a/src/intel/compiler/brw_fs.cpp b/src/intel/compiler/brw_fs.cpp index 52a54fecdaa..b19f8fab3a9 100644 --- a/src/intel/compiler/brw_fs.cpp +++ b/src/intel/compiler/brw_fs.cpp @@ -8274,6 +8274,16 @@ brw_compile_fs(const struct brw_compiler *compiler, void *log_data, prog_data->reg_blocks_8 = brw_register_blocks(v8.grf_used); } + /* Limit dispatch width to simd8 with dual source blending on gen8. + * See: https://gitlab.freedesktop.org/mesa/mesa/issues/1917 + */ + if (devinfo->gen == 8 && prog_data->dual_src_blend && + !(INTEL_DEBUG & DEBUG_NO8)) { + assert(!use_rep_send); + v8.limit_dispatch_width(8, "gen8 workaround: " + "using SIMD8 when dual src blending.\n"); + } + if (v8.max_dispatch_width >= 16 && likely(!(INTEL_DEBUG & DEBUG_NO16) || use_rep_send)) { /* Try a SIMD16 compile */