diff options
| -rw-r--r-- | src/gallium/drivers/freedreno/ir3/ir3_cp.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/gallium/drivers/freedreno/ir3/ir3_cp.c b/src/gallium/drivers/freedreno/ir3/ir3_cp.c index 6037becf22f..e8a2f099391 100644 --- a/src/gallium/drivers/freedreno/ir3/ir3_cp.c +++ b/src/gallium/drivers/freedreno/ir3/ir3_cp.c @@ -442,6 +442,37 @@ instr_cp(struct ir3_instruction *instr) instr_cp(instr->address); ir3_instr_set_address(instr, eliminate_output_mov(instr->address)); } + + /* we can end up with extra cmps.s from frontend, which uses a + * + * cmps.s p0.x, cond, 0 + * + * as a way to mov into the predicate register. But frequently 'cond' + * is itself a cmps.s/cmps.f/cmps.u. So detect this special case and + * just re-write the instruction writing predicate register to get rid + * of the double cmps. + */ + if ((instr->opc == OPC_CMPS_S) && + (instr->regs[0]->num == regid(REG_P0, 0)) && + ssa(instr->regs[1]) && + (instr->regs[2]->flags & IR3_REG_IMMED) && + (instr->regs[2]->iim_val == 0)) { + struct ir3_instruction *cond = ssa(instr->regs[1]); + switch (cond->opc) { + case OPC_CMPS_S: + case OPC_CMPS_F: + case OPC_CMPS_U: + instr->opc = cond->opc; + instr->flags = cond->flags; + instr->cat2 = cond->cat2; + instr->address = cond->address; + instr->regs[1] = cond->regs[1]; + instr->regs[2] = cond->regs[2]; + break; + default: + break; + } + } } void |