diff options
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp b/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp index 52bfa921dc..c92aae4b1d 100644 --- a/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp @@ -541,8 +541,16 @@ fs_visitor::try_constant_propagate(fs_inst *inst, acp_entry *entry) /* Fit this constant in by commuting the operands. * Exception: we can't do this for 32-bit integer MUL/MACH * because it's asymmetric. + * + * The BSpec says for Broadwell that + * + * "When multiplying DW x DW, the dst cannot be accumulator." + * + * Integer MUL with a non-accumulator destination will be lowered + * by lower_integer_multiplication(), so don't restrict it. */ - if ((inst->opcode == BRW_OPCODE_MUL || + if (((inst->opcode == BRW_OPCODE_MUL && + inst->dst.is_accumulator()) || inst->opcode == BRW_OPCODE_MACH) && (inst->src[1].type == BRW_REGISTER_TYPE_D || inst->src[1].type == BRW_REGISTER_TYPE_UD)) |