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v3d: Allow reading from physical regs written in the previous instruction.

Browse source 
This restriction existed in V3D 2.x, but lifting it was a major change in
3.x.

shader-db results:
total instructions in shared programs: 98117 -> 96831 (-1.31%)
instructions in affected programs:     48520 -> 47234 (-2.65%)
This commit is contained in:
Eric Anholt 2018-07-20 11:53:25 -07:00
parent e6e22e4207
commit 1fb31819ae
1 changed files with 0 additions and 24 deletions
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24
src/broadcom/compiler/qpu_schedule.c
View file

@ -462,7 +462,6 @@ struct choose_scoreboard {
int last_sfu_write_tick;
int last_ldvary_tick;
int last_uniforms_reset_tick;
uint32_t last_waddr_add, last_waddr_mul;
bool tlb_locked;
};
@ -471,20 +470,6 @@ mux_reads_too_soon(struct choose_scoreboard *scoreboard,
const struct v3d_qpu_instr *inst, enum v3d_qpu_mux mux)
{
switch (mux) {
case V3D_QPU_MUX_A:
if (scoreboard->last_waddr_add == inst->raddr_a ||
scoreboard->last_waddr_mul == inst->raddr_a) {
return true;
}
break;
case V3D_QPU_MUX_B:
if (scoreboard->last_waddr_add == inst->raddr_b ||
scoreboard->last_waddr_mul == inst->raddr_b) {
return true;
}
break;
case V3D_QPU_MUX_R4:
if (scoreboard->tick - scoreboard->last_sfu_write_tick <= 2)
return true;
@ -847,9 +832,6 @@ static void
update_scoreboard_for_chosen(struct choose_scoreboard *scoreboard,
const struct v3d_qpu_instr *inst)
{
scoreboard->last_waddr_add = ~0;
scoreboard->last_waddr_mul = ~0;
if (inst->type == V3D_QPU_INSTR_TYPE_BRANCH)
return;
@ -859,8 +841,6 @@ update_scoreboard_for_chosen(struct choose_scoreboard *scoreboard,
if (inst->alu.add.magic_write) {
update_scoreboard_for_magic_waddr(scoreboard,
inst->alu.add.waddr);
} else {
scoreboard->last_waddr_add = inst->alu.add.waddr;
}
}
@ -868,8 +848,6 @@ update_scoreboard_for_chosen(struct choose_scoreboard *scoreboard,
if (inst->alu.mul.magic_write) {
update_scoreboard_for_magic_waddr(scoreboard,
inst->alu.mul.waddr);
} else {
scoreboard->last_waddr_mul = inst->alu.mul.waddr;
}
}
@ -1488,8 +1466,6 @@ v3d_qpu_schedule_instructions(struct v3d_compile *c)
struct choose_scoreboard scoreboard;
memset(&scoreboard, 0, sizeof(scoreboard));
scoreboard.last_waddr_add = ~0;
scoreboard.last_waddr_mul = ~0;
scoreboard.last_ldvary_tick = -10;
scoreboard.last_sfu_write_tick = -10;
scoreboard.last_uniforms_reset_tick = -10;