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intel/fs: Don't lower integer multiplies that don't need lowering

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v2: Move the check to fs_visitor::lower_integer_multiplication.
Previously the cases where lowering was skipped, the original
instruction was removed by fs_visitor::lower_integer_multiplication.

Reviewed-by: Caio Marcelo de Oliveira Filho <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/767>
This commit is contained in:
Ian Romanick 2019-12-05 08:25:34 -08:00 • committed by Marge Bot
parent db649fd582
commit 74cd0964d6
1 changed files with 11 additions and 0 deletions
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11
src/intel/compiler/brw_fs.cpp
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@ -4107,6 +4107,17 @@ fs_visitor::lower_integer_multiplication()
foreach_block_and_inst_safe(block, fs_inst, inst, cfg) {
if (inst->opcode == BRW_OPCODE_MUL) {
/* If the instruction is already in a form that does not need lowering,
* return early.
*/
if (devinfo->gen >= 7) {
if (type_sz(inst->src[1].type) < 4 && type_sz(inst->src[0].type) <= 4)
continue;
} else {
if (type_sz(inst->src[0].type) < 4 && type_sz(inst->src[1].type) <= 4)
continue;
}
if ((inst->dst.type == BRW_REGISTER_TYPE_Q ||
inst->dst.type == BRW_REGISTER_TYPE_UQ) &&
(inst->src[0].type == BRW_REGISTER_TYPE_Q ||