From 4b2257623494ea8e7a1c7b6fbb2f4f3e59522468 Mon Sep 17 00:00:00 2001 From: Iago Toral Quiroga Date: Wed, 29 Jun 2016 13:08:25 +0200 Subject: [PATCH] i965/vec4: implement HW workaround for align16 double to float conversion From the BDW PRM, Workarounds chapter: "DF->f format conversion for Align16 has wrong emask calculation when source is immediate." Notice that Broadwell and later are strictly scalar at the moment though, so this is not really necessary. v2: Instead of moving the immediate to a vgrf and converting from there, just convert the double immediate to float in the compiler and move the result to the destination (Matt) Reviewed-by: Matt Turner --- src/mesa/drivers/dri/i965/brw_vec4_nir.cpp | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp index 4aeb8cb..e31c8c2 100644 --- a/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp +++ b/src/mesa/drivers/dri/i965/brw_vec4_nir.cpp @@ -1071,6 +1071,17 @@ vec4_visitor::emit_conversion_from_double(dst_reg dst, src_reg src, bool saturate, brw_reg_type single_type) { + /* BDW PRM vol 15 - workarounds: + * DF->f format conversion for Align16 has wrong emask calculation when + * source is immediate. + */ + if (devinfo->gen == 8 && single_type == BRW_REGISTER_TYPE_F && + src.file == BRW_IMMEDIATE_VALUE) { + vec4_instruction *inst = emit(MOV(dst, brw_imm_f(src.df))); + inst->saturate = saturate; + return; + } + dst_reg temp = dst_reg(this, glsl_type::dvec4_type); emit(MOV(temp, src)); -- 2.7.4