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Initial implementation of "known to be arithmetic NaN / not NaN".

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This commit is contained in:
Nick Lewycky 2019-11-06 17:14:32 -08:00
parent fafc7ad38c
commit 26c8fd52c8
2 changed files with 319 additions and 161 deletions
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430
lib/llvm-backend/src/code.rs
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50
lib/llvm-backend/src/state.rs
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@ -4,7 +4,7 @@ use inkwell::{
}; };
use smallvec::SmallVec; use smallvec::SmallVec;
use std::cell::Cell; use std::cell::Cell;
use std::ops::Add; use std::ops::{BitAnd, BitOr, BitOrAssign};
use wasmparser::BinaryReaderError; use wasmparser::BinaryReaderError;
#[derive(Debug)] #[derive(Debug)]
@ -111,18 +111,26 @@ impl ExtraInfo {
pub fn is_arithmetic_f64(&self) -> bool { pub fn is_arithmetic_f64(&self) -> bool {
self.state & ExtraInfo::arithmetic_f64().state != 0 self.state & ExtraInfo::arithmetic_f64().state != 0
} }
pub fn strip_pending(&self) -> ExtraInfo {
ExtraInfo {
state: self.state
& !(ExtraInfo::arithmetic_f32().state | ExtraInfo::arithmetic_f64().state),
}
}
} }
impl Default for ExtraInfo { impl Default for ExtraInfo {
fn default() -> Self { fn default() -> Self {
ExtraInfo { state: 0 } ExtraInfo { state: 0 }
} }
} }
impl Add for ExtraInfo { // Union two ExtraInfos.
impl BitOr for ExtraInfo {
type Output = Self; type Output = Self;
fn add(self, other: Self) -> Self { fn bitor(self, other: Self) -> Self {
assert!(self.has_pending_f32_nan() && other.has_pending_f64_nan()); assert!(!(self.has_pending_f32_nan() && other.has_pending_f64_nan()));
assert!(self.has_pending_f64_nan() && other.has_pending_f32_nan()); assert!(!(self.has_pending_f64_nan() && other.has_pending_f32_nan()));
ExtraInfo { ExtraInfo {
state: if self.is_arithmetic_f32() || other.is_arithmetic_f32() { state: if self.is_arithmetic_f32() || other.is_arithmetic_f32() {
ExtraInfo::arithmetic_f32().state ExtraInfo::arithmetic_f32().state
@ -140,6 +148,29 @@ impl Add for ExtraInfo {
} }
} }
} }
impl BitOrAssign for ExtraInfo {
fn bitor_assign(&mut self, other: Self) {
*self = *self | other;
}
}
// Intersection for ExtraInfo. Does not check the "pending" bits, since those
// aren't safe to discard (or even to reorder). Callers are assumed to be in a
// situation where the result will have a pending bit set unconditionally.
impl BitAnd for ExtraInfo {
type Output = Self;
fn bitand(self, other: Self) -> Self {
match (
self.is_arithmetic_f32() && other.is_arithmetic_f32(),
self.is_arithmetic_f64() && other.is_arithmetic_f64(),
) {
(false, false) => Default::default(),
(true, false) => ExtraInfo::arithmetic_f32(),
(false, true) => ExtraInfo::arithmetic_f64(),
(true, true) => ExtraInfo::arithmetic_f32() | ExtraInfo::arithmetic_f64(),
}
}
}
#[derive(Debug)] #[derive(Debug)]
pub struct State { pub struct State {
@ -251,15 +282,6 @@ impl State {
Ok((v1, v2)) Ok((v1, v2))
} }
pub fn pop3(
&mut self,
) -> Result<(BasicValueEnum, BasicValueEnum, BasicValueEnum), BinaryReaderError> {
let v3 = self.pop1()?;
let v2 = self.pop1()?;
let v1 = self.pop1()?;
Ok((v1, v2, v3))
}
pub fn pop3_extra( pub fn pop3_extra(
&mut self, &mut self,
) -> Result< ) -> Result<