Merge pull request rust-lang#618 from tgross35/benchmarking

Add benchmarks for floating point math

Author: Amanieu

ci/run.sh

@@ -4,7 +4,9 @@ set -eux
 
 target="${1:-}"
 
-if [ -z "${1:-}" ]; then
+export RUST_BACKTRACE="${RUST_BACKTRACE:-full}"
+
+if [ -z "$target" ]; then
     host_target=$(rustc -vV | awk '/^host/ { print $2 }')
     echo "Defaulted to host target $host_target"
     target="$host_target"
@@ -30,6 +32,8 @@ else
     $run --features no-asm --release
     $run --features no-f16-f128
     $run --features no-f16-f128 --release
+    $run --benches
+    $run --benches --release
 fi
 
 if [ "${TEST_VERBATIM:-}" = "1" ]; then

testcrate/Cargo.toml

@@ -21,6 +21,10 @@ path = ".."
 default-features = false
 features = ["public-test-deps"]
 
+[dev-dependencies]
+criterion = { version = "0.5.1", default-features = false, features = ["cargo_bench_support"] }
+paste = "1.0.15"
+
 [target.'cfg(all(target_arch = "arm", not(any(target_env = "gnu", target_env = "musl")), target_os = "linux"))'.dev-dependencies]
 test = { git = "https://github.com/japaric/utest" }
 utest-cortex-m-qemu = { default-features = false, git = "https://github.com/japaric/utest" }
@@ -34,6 +38,48 @@ no-f16-f128 = ["compiler_builtins/no-f16-f128"]
 mem = ["compiler_builtins/mem"]
 mangled-names = ["compiler_builtins/mangled-names"]
 # Skip tests that rely on f128 symbols being available on the system
-no-sys-f128 = ["no-sys-f128-int-convert"]
+no-sys-f128 = ["no-sys-f128-int-convert", "no-sys-f16-f128-convert"]
 # Some platforms have some f128 functions but everything except integer conversions
 no-sys-f128-int-convert = []
+no-sys-f16-f128-convert = []
+# Skip tests that rely on f16 symbols being available on the system
+no-sys-f16 = []
+
+# Enable report generation without bringing in more dependencies by default
+benchmarking-reports = ["criterion/plotters", "criterion/html_reports"]
+
+[[bench]]
+name = "float_add"
+harness = false
+
+[[bench]]
+name = "float_sub"
+harness = false
+
+[[bench]]
+name = "float_mul"
+harness = false
+
+[[bench]]
+name = "float_div"
+harness = false
+
+[[bench]]
+name = "float_cmp"
+harness = false
+
+[[bench]]
+name = "float_conv"
+harness = false
+
+[[bench]]
+name = "float_extend"
+harness = false
+
+[[bench]]
+name = "float_trunc"
+harness = false
+
+[[bench]]
+name = "float_pow"
+harness = false