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nvc0/ir: handle zero and negative sqrt arguments

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Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
This commit is contained in:
Ilia Mirkin
2014-07-07 02:32:45 -04:00
parent 88127874a3
commit ef8f09be33
1 changed files with 14 additions and 2 deletions
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src/gallium/drivers/nouveau/codegen/nv50_ir_lowering_nvc0.cpp
+14 -2
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@@ -1567,10 +1567,22 @@ NVC0LoweringPass::handleMOD(Instruction *i)
bool
NVC0LoweringPass::handleSQRT(Instruction *i)
{
Instruction *rsq = bld.mkOp1(OP_RSQ, i->dType,
bld.getSSA(typeSizeof(i->dType)), i->getSrc(0));
Value *pred = bld.getSSA(1, FILE_PREDICATE);
Value *zero = bld.getSSA();
Instruction *rsq;
bld.mkOp1(OP_MOV, TYPE_U32, zero, bld.mkImm(0));
if (i->dType == TYPE_F64)
zero = bld.mkOp2v(OP_MERGE, TYPE_U64, bld.getSSA(8), zero, zero);
bld.mkCmp(OP_SET, CC_LE, i->dType, pred, i->dType, i->getSrc(0), zero);
bld.mkOp1(OP_MOV, i->dType, i->getDef(0), zero)->setPredicate(CC_P, pred);
rsq = bld.mkOp1(OP_RSQ, i->dType,
bld.getSSA(typeSizeof(i->dType)), i->getSrc(0));
rsq->setPredicate(CC_NOT_P, pred);
i->op = OP_MUL;
i->setSrc(1, rsq->getDef(0));
i->setPredicate(CC_NOT_P, pred);
return true;
}