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Migrate ctfe-stress-test-3 to ctfe-stress-test-4 #552

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Merged
merged 1 commit into from
Nov 12, 2019
+16 −15
Merged

Migrate ctfe-stress-test-3 to ctfe-stress-test-4 #552

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3 changes: 1 addition & 2 deletions collector/benchmarks/README.md
View file
Original file line number Diff line number Diff line change
@@ -71,7 +71,7 @@ programs.
- **coercions**: Contains a static array with 65,536 string literals, which
caused [poor performance](https://github.com/rust-lang/rust/issues/32278) in
the past.
- **ctfe-stress-3**: A stress test for compile-time function evaluation.
- **ctfe-stress-4**: A stress test for compile-time function evaluation.
- **deeply-nested**: A small program that caused [exponential
behavior](https://github.com/rust-lang/rust/issues/38528) in the past.
- **deep-vector**: A test containing a single large vector of zeroes, which
@@ -94,4 +94,3 @@ programs.
behavior](https://github.com/rust-lang/rust/pull/32062) in the past.
- **unused-warnings**: Contains many unused imports, which caused [quadratic
behavior](https://github.com/rust-lang/rust/issues/43572) in the past.

0 ...ector/benchmarks/ctfe-stress-3/Cargo.lock → ...ector/benchmarks/ctfe-stress-4/Cargo.lock
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File renamed without changes.
2 changes: 1 addition & 1 deletion ...ector/benchmarks/ctfe-stress-3/Cargo.toml → ...ector/benchmarks/ctfe-stress-4/Cargo.toml
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
[package]
name = "ctfe-stress-3"
name = "ctfe-stress-4"
version = "0.1.0"
authors = ["Ralf Jung <[email protected]>"]
26 changes: 14 additions & 12 deletions ...ector/benchmarks/ctfe-stress-3/src/lib.rs → ...ector/benchmarks/ctfe-stress-4/src/lib.rs
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Original file line number Diff line number Diff line change
@@ -2,6 +2,8 @@
use std::mem::MaybeUninit;

// Try to make CTFE actually do a lot of computation, without producing a big result.
// The const fn expressions evaluated here take a dummy u32 argument because otherwise
// const fn memoisation is able to eliminate a lot of the work.
// And without support for loops.

macro_rules! const_repeat {
@@ -17,27 +19,27 @@ macro_rules! const_repeat {
}};
// Recursive case: Take a 16
([16 $($n: tt)*] $e: expr, $T: ty) => {{
const fn e() -> $T { const_repeat!([$($n)*] $e, $T) }
e(); e(); e(); e();
e(); e(); e(); e();
e(); e(); e(); e();
e(); e(); e(); e()
const fn e(_: u32) -> $T { const_repeat!([$($n)*] $e, $T) }
e(0); e(0); e(0); e(0);
e(0); e(0); e(0); e(0);
e(0); e(0); e(0); e(0);
e(0); e(0); e(0); e(0)
}};
// Recursive case: Take a 8
([8 $($n: tt)*] $e: expr, $T: ty) => {{
const fn e() -> $T { const_repeat!([$($n)*] $e, $T) }
e(); e(); e(); e();
e(); e(); e(); e()
const fn e(_: u32) -> $T { const_repeat!([$($n)*] $e, $T) }
e(0); e(0); e(0); e(0);
e(0); e(0); e(0); e(0)
}};
// Recursive case: Take a 4
([4 $($n: tt)*] $e: expr, $T: ty) => {{
const fn e() -> $T { const_repeat!([$($n)*] $e, $T) }
e(); e(); e(); e()
const fn e(_: u32) -> $T { const_repeat!([$($n)*] $e, $T) }
e(0); e(0); e(0); e(0)
}};
// Recursive case: Take a 2
([2 $($n: tt)*] $e: expr, $T: ty) => {{
const fn e() -> $T { const_repeat!([$($n)*] $e, $T) }
e(); e()
const fn e(_: u32) -> $T { const_repeat!([$($n)*] $e, $T) }
e(0); e(0)
}};
}
macro_rules! expensive_static {