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i965/vec4: Use UW type for multiply into accumulator on GEN8+

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BDW adds the following restriction: "When multiplying DW x DW, the dst
cannot be accumulator."

Cc: "11.1,11.0" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Jason Ekstrand 2016-01-14 12:08:57 -08:00 • committed by Jason Ekstrand
parent 03f66dfb4b
commit 0a6811207f
1 changed files with 5 additions and 1 deletions
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6
src/mesa/drivers/dri/i965/brw_vec4_nir.cpp
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@ -1069,7 +1069,11 @@ vec4_visitor::nir_emit_alu(nir_alu_instr *instr)
case nir_op_umul_high: {
struct brw_reg acc = retype(brw_acc_reg(8), dst.type);
emit(MUL(acc, op[0], op[1]));
if (devinfo->gen >=8)
emit(MUL(acc, op[0], retype(op[1], BRW_REGISTER_TYPE_UW)));
else
emit(MUL(acc, op[0], op[1]));
emit(MACH(dst, op[0], op[1]));
break;
}