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nak: Implement 64-bit nir_op_fsign

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There is NIR lowering for this but this implementation is more
efficient.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26587>
This commit is contained in:
Faith Ekstrand 2023-12-18 17:50:32 -06:00 • committed by Marge Bot
parent d03cbac05a
commit 1f5623c557
2 changed files with 26 additions and 4 deletions
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12
src/nouveau/compiler/nak/builder.rs
View file

@ -217,6 +217,18 @@ pub trait SSABuilder: Builder {
dst
}
fn dsetp(&mut self, cmp_op: FloatCmpOp, x: Src, y: Src) -> SSARef {
let dst = self.alloc_ssa(RegFile::Pred, 1);
self.push_op(OpDSetP {
dst: dst.into(),
set_op: PredSetOp::And,
cmp_op: cmp_op,
srcs: [x, y],
accum: SrcRef::True.into(),
});
dst
}
fn iabs(&mut self, i: Src) -> SSARef {
let dst = self.alloc_ssa(RegFile::GPR, 1);
self.push_op(OpIAbs {

18
src/nouveau/compiler/nak/from_nir.rs
View file

@ -885,10 +885,20 @@ impl<'a> ShaderFromNir<'a> {
}
}
nir_op_fsign => {
assert!(alu.def.bit_size() == 32);
let lz = b.fset(FloatCmpOp::OrdLt, srcs[0], 0.into());
let gz = b.fset(FloatCmpOp::OrdGt, srcs[0], 0.into());
b.fadd(gz.into(), Src::from(lz).fneg())
if alu.def.bit_size() == 64 {
let lz = b.dsetp(FloatCmpOp::OrdLt, srcs[0], 0.into());
let gz = b.dsetp(FloatCmpOp::OrdGt, srcs[0], 0.into());
let hi = b.sel(lz.into(), 0xbff00000.into(), 0.into());
let hi = b.sel(gz.into(), 0x3ff00000.into(), hi.into());
let lo = b.copy(0.into());
[lo[0], hi[0]].into()
} else if alu.def.bit_size() == 32 {
let lz = b.fset(FloatCmpOp::OrdLt, srcs[0], 0.into());
let gz = b.fset(FloatCmpOp::OrdGt, srcs[0], 0.into());
b.fadd(gz.into(), Src::from(lz).fneg())
} else {
panic!("Unsupported float type: f{}", alu.def.bit_size());
}
}
nir_op_fsin => {
let frac_1_2pi = 1.0 / (2.0 * std::f32::consts::PI);