54 lines
2.2 KiB
Rust
54 lines
2.2 KiB
Rust
// This test makes sure that PGO profiling data leads to cold functions being
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// marked as `cold` and hot functions with `inlinehint`.
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// The test program contains an `if` where actual execution only ever takes the
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// `else` branch. Accordingly, we expect the function that is never called to
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// be marked as cold.
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// See https://github.com/rust-lang/rust/pull/60262
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//@ needs-profiler-support
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//@ ignore-cross-compile
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use run_make_support::{
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cwd, find_files_by_prefix_and_extension, fs_wrapper, llvm_filecheck, llvm_profdata,
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run_with_args, rustc,
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};
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fn main() {
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// Compile the test program with instrumentation
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// Disable the pre-inlining pass (i.e. a pass that does some inlining before
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// it adds the profiling instrumentation). Disabling this pass leads to
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// rather predictable IR which we need for this test to be stable.
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rustc()
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.opt_level("2")
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.codegen_units(1)
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.arg("-Cllvm-args=-disable-preinline")
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.profile_generate(cwd())
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.input("main.rs")
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.run();
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// Run it in order to generate some profiling data
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run_with_args("main", &["some-argument"]);
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// Postprocess the profiling data so it can be used by the compiler
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llvm_profdata()
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.merge()
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.output("merged.profdata")
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.input(find_files_by_prefix_and_extension(cwd(), "default", "profraw").get(0).unwrap())
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.run();
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// Compile the test program again, making use of the profiling data
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rustc()
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.opt_level("2")
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.codegen_units(1)
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.arg("-Cllvm-args=-disable-preinline")
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.profile_use("merged.profdata")
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.emit("llvm-ir")
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.input("main.rs")
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.run();
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// Check that the generate IR contains some things that we expect
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//
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// We feed the file into LLVM FileCheck tool *in reverse* so that we see the
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// line with the function name before the line with the function attributes.
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// FileCheck only supports checking that something matches on the next line,
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// but not if something matches on the previous line.
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let mut bytes = fs_wrapper::read("interesting.ll");
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bytes.reverse();
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llvm_filecheck().patterns("filecheck-patterns.txt").stdin(bytes).run();
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}
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