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broadcom/compiler: allow dead code elimination of unused trailing ldunifa

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If a ldunifa is the last in a sequence and is not used, we can safely
eliminate it.

Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9128>
This commit is contained in:
Iago Toral Quiroga
2021-02-16 11:04:44 +01:00
committed by Marge Bot
parent e20ae14978
commit 9d16d2d0be
1 changed files with 29 additions and 1 deletions
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30
src/broadcom/compiler/vir_opt_dead_code.c
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@@ -90,6 +90,32 @@ vir_dce_flags(struct v3d_compile *c, struct qinst *inst)
inst->qpu.flags.muf = V3D_QPU_UF_NONE;
}
static bool
is_last_ldunifa(struct v3d_compile *c, struct qinst *inst, struct qblock *block)
{
if (!inst->qpu.sig.ldunifa && !inst->qpu.sig.ldunifarf)
return false;
list_for_each_entry_from(struct qinst, scan_inst, inst->link.next,
&block->instructions, link) {
/* If we find a new write to unifa, then this was the last
* ldunifa in its sequence and is safe to remove.
*/
if (scan_inst->dst.file == QFILE_MAGIC &&
scan_inst->dst.index == V3D_QPU_WADDR_UNIFA) {
return true;
}
/* If we find another ldunifa in the same sequence then we
* can't remove it.
*/
if (scan_inst->qpu.sig.ldunifa || scan_inst->qpu.sig.ldunifarf)
return false;
}
return true;
}
bool
vir_opt_dead_code(struct v3d_compile *c)
{
@@ -125,8 +151,10 @@ vir_opt_dead_code(struct v3d_compile *c)
continue;
}
if (vir_has_side_effects(c, inst))
if (vir_has_side_effects(c, inst) &&
!is_last_ldunifa(c, inst, block)) {
continue;
}
if (v3d_qpu_writes_flags(&inst->qpu)) {
/* If we obscure a previous flags write,