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nak/builder: Fix isetp64 for pre-Volta

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Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30381>
This commit is contained in:
Faith Ekstrand
2024-07-24 23:44:19 -05:00
committed by Marge Bot
parent a33507d621
commit efd86d6daa
1 changed files with 58 additions and 10 deletions
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68
src/nouveau/compiler/nak/builder.rs
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@@ -584,16 +584,64 @@ pub trait SSABuilder: Builder {
});
}
IntCmpOp::Ge | IntCmpOp::Gt | IntCmpOp::Le | IntCmpOp::Lt => {
self.push_op(OpISetP {
dst: dst.into(),
set_op: PredSetOp::And,
cmp_op: cmp_op,
cmp_type: cmp_type,
ex: true,
srcs: [x[1].into(), y[1].into()],
accum: true.into(),
low_cmp: low.into(),
});
if self.sm() >= 70 {
self.push_op(OpISetP {
dst: dst.into(),
set_op: PredSetOp::And,
cmp_op,
cmp_type,
ex: true,
srcs: [x[1].into(), y[1].into()],
accum: true.into(),
low_cmp: low.into(),
});
} else {
// On Maxwell, iset.ex only has one source for both accum
// and low_cmp and it does a weird truth table dance. (See
// Foldable for OpISetP for details.)
let low_or_accum = self.alloc_ssa(RegFile::Pred, 1);
let set_op = match cmp_op {
IntCmpOp::Ge | IntCmpOp::Gt => {
// When x != y, we want low_or_accum == false
self.push_op(OpISetP {
dst: low_or_accum.into(),
set_op: PredSetOp::And,
cmp_op: IntCmpOp::Eq,
cmp_type: IntCmpType::U32,
ex: false,
srcs: [x[1].into(), y[1].into()],
accum: low.into(),
low_cmp: true.into(),
});
PredSetOp::Or
}
IntCmpOp::Le | IntCmpOp::Lt => {
// When x != y, we want low_or_accum == true
self.push_op(OpISetP {
dst: low_or_accum.into(),
set_op: PredSetOp::Or,
cmp_op: IntCmpOp::Ne,
cmp_type: IntCmpType::U32,
ex: false,
srcs: [x[1].into(), y[1].into()],
accum: low.into(),
low_cmp: true.into(),
});
PredSetOp::And
}
_ => panic!("Not an integer inequality"),
};
self.push_op(OpISetP {
dst: dst.into(),
set_op,
cmp_op,
cmp_type,
ex: true,
srcs: [x[1].into(), y[1].into()],
accum: low_or_accum.into(),
low_cmp: low_or_accum.into(),
});
}
}
}
dst