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#!/bin/bash
set -euxo pipefail
rm -rf /tmp/rustc-pgo
python3 ../x.py build --target=$PGO_HOST --host=$PGO_HOST \
--stage 2 library/std \
--rust-profile-generate=/tmp/rustc-pgo \
--llvm-profile-generate
# Profile libcore compilation in opt-level=0 and opt-level=3
RUSTC_BOOTSTRAP=1 ./build/$PGO_HOST/stage2/bin/rustc --edition=2018 \
--crate-type=lib ../library/core/src/lib.rs
RUSTC_BOOTSTRAP=1 ./build/$PGO_HOST/stage2/bin/rustc --edition=2018 \
--crate-type=lib -Copt-level=3 ../library/core/src/lib.rs
cp -r /tmp/rustc-perf ./
chown -R $(whoami): ./rustc-perf
cd rustc-perf
# Build the collector ahead of time, which is needed to make sure the rustc-fake
# binary used by the collector is present.
RUSTC=/checkout/obj/build/$PGO_HOST/stage0/bin/rustc \
RUSTC_BOOTSTRAP=1 \
/checkout/obj/build/$PGO_HOST/stage0/bin/cargo build -p collector
# benchmark using profile_local with eprintln, which essentially just means
# don't actually benchmark -- just make sure we run rustc a bunch of times.
RUST_LOG=collector=debug \
RUSTC=/checkout/obj/build/$PGO_HOST/stage0/bin/rustc \
RUSTC_BOOTSTRAP=1 \
/checkout/obj/build/$PGO_HOST/stage0/bin/cargo run -p collector --bin collector -- \
profile_local \
eprintln \
/checkout/obj/build/$PGO_HOST/stage2/bin/rustc \
Test \
--builds Check,Debug,Opt \
--cargo /checkout/obj/build/$PGO_HOST/stage0/bin/cargo \
--runs All \
--include externs,ctfe-stress-4,inflate,cargo,token-stream-stress,match-stress-enum
cd /checkout/obj
# Merge the profile data we gathered
./build/$PGO_HOST/llvm/bin/llvm-profdata \
merge -o /tmp/rustc-pgo.profdata /tmp/rustc-pgo
# Merge the profile data we gathered for LLVM
# Note that this uses the profdata from the clang we used to build LLVM,
# which likely has a different version than our in-tree clang.
/rustroot/bin/llvm-profdata \
merge -o /tmp/llvm-pgo.profdata ./build/$PGO_HOST/llvm/build/profiles
# Rustbuild currently doesn't support rebuilding LLVM when PGO options
# change (or any other llvm-related options); so just clear out the relevant
# directories ourselves.
rm -r ./build/$PGO_HOST/llvm ./build/$PGO_HOST/lld
# This produces the actual final set of artifacts.
$@ \
--rust-profile-use=/tmp/rustc-pgo.profdata \
--llvm-profile-use=/tmp/llvm-pgo.profdata
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