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intel/fs: Fix integer multiplication lowering for src/dst hazards

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Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Cc: mesa-stable@lists.freedesktop.org
This commit is contained in:
Jason Ekstrand
2017-10-17 18:56:29 -07:00
parent fd1bcccc2d
commit d54f8ec744
1 changed files with 8 additions and 2 deletions
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10
src/intel/compiler/brw_fs.cpp
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@@ -3487,8 +3487,14 @@ fs_visitor::lower_integer_multiplication()
* schedule multi-component multiplications much better.
*/
bool needs_mov = false;
fs_reg orig_dst = inst->dst;
if (orig_dst.is_null() || orig_dst.file == MRF) {
if (orig_dst.is_null() || orig_dst.file == MRF ||
regions_overlap(inst->dst, inst->size_written,
inst->src[0], inst->size_read(0)) ||
regions_overlap(inst->dst, inst->size_written,
inst->src[1], inst->size_read(1))) {
needs_mov = true;
inst->dst = fs_reg(VGRF, alloc.allocate(dispatch_width / 8),
inst->dst.type);
}
@@ -3519,7 +3525,7 @@ fs_visitor::lower_integer_multiplication()
subscript(low, BRW_REGISTER_TYPE_UW, 1),
subscript(high, BRW_REGISTER_TYPE_UW, 0));
if (inst->conditional_mod || orig_dst.file == MRF) {
if (needs_mov || inst->conditional_mod) {
set_condmod(inst->conditional_mod,
ibld.MOV(orig_dst, inst->dst));
}