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Make algebraic intrinsics into 'const fn' items; Make algebraic functions of 'f16', 'f32', 'f64', and 'f128' into 'const fn' items;

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Gabriel Bjørnager Jensen 2025-04-22 16:39:32 +02:00
parent 6bc57c6bf7
commit 82ccba1fd7
7 changed files with 71 additions and 51 deletions
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26
compiler/rustc_const_eval/src/interpret/intrinsics.rs
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@ -158,6 +158,32 @@ impl<'tcx, M: Machine<'tcx>> InterpCx<'tcx, M> {
self.copy_op(&val, dest)?;
}
sym::fadd_algebraic
| sym::fsub_algebraic
| sym::fmul_algebraic
| sym::fdiv_algebraic
| sym::frem_algebraic => {
let a = self.read_immediate(&args[0])?;
let b = self.read_immediate(&args[1])?;
let op = match intrinsic_name {
sym::fadd_algebraic => BinOp::Add,
sym::fsub_algebraic => BinOp::Sub,
sym::fmul_algebraic => BinOp::Mul,
sym::fdiv_algebraic => BinOp::Div,
sym::frem_algebraic => BinOp::Rem,
_ => bug!(),
};
let res = self.binary_op(op, &a, &b)?;
// `binary_op` already called `generate_nan` if needed.
// FIXME: Tests do likely benefit from us adding some randomness to the result here to catch any dependences on exact computations. This has previously been done, but the behaviour was removed as part of constification.
self.write_immediate(*res, dest)?;
}
sym::ctpop
| sym::cttz
| sym::cttz_nonzero