mirror of https://github.com/rust-lang/rust
58 lines
1.5 KiB
Rust
58 lines
1.5 KiB
Rust
// skip-filecheck
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// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
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#![feature(flt2dec)]
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extern crate core;
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use core::num::flt2dec;
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use std::fmt::{Formatter, Result};
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// EMIT_MIR funky_arms.float_to_exponential_common.GVN.diff
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pub fn float_to_exponential_common<T>(fmt: &mut Formatter<'_>, num: &T, upper: bool) -> Result
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where
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T: flt2dec::DecodableFloat,
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{
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let force_sign = fmt.sign_plus();
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// A bug in const propagation (never reached master, but during dev of a PR) caused the
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// `sign = Minus` assignment to get propagated into all future reads of `sign`. This is
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// wrong because `sign` could also have `MinusPlus` value.
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let sign = match force_sign {
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false => flt2dec::Sign::Minus,
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true => flt2dec::Sign::MinusPlus,
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};
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if let Some(precision) = fmt.precision() {
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// 1 integral digit + `precision` fractional digits = `precision + 1` total digits
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float_to_exponential_common_exact(fmt, num, sign, precision as u32 + 1, upper)
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} else {
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float_to_exponential_common_shortest(fmt, num, sign, upper)
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}
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}
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#[inline(never)]
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fn float_to_exponential_common_exact<T>(
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fmt: &mut Formatter<'_>,
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num: &T,
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sign: flt2dec::Sign,
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precision: u32,
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upper: bool,
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) -> Result
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where
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T: flt2dec::DecodableFloat,
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{
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unimplemented!()
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}
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#[inline(never)]
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fn float_to_exponential_common_shortest<T>(
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fmt: &mut Formatter<'_>,
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num: &T,
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sign: flt2dec::Sign,
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upper: bool,
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) -> Result
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where
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T: flt2dec::DecodableFloat,
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{
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unimplemented!()
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}
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