rustc_llvm: Add a -Z print-llvm-stats
option to expose LLVM statistics.
LLVM has a neat [statistics] feature that tracks how often optimizations kick in. It's very handy for optimization work. Since we expose the LLVM pass timings, I thought it made sense to expose the LLVM statistics too. [statistics]: https://llvm.org/docs/ProgrammersManual.html#the-statistic-class-stats-option
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@ -110,6 +110,10 @@ unsafe fn configure_llvm(sess: &Session) {
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// Use non-zero `import-instr-limit` multiplier for cold callsites.
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add("-import-cold-multiplier=0.1", false);
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if sess.print_llvm_stats() {
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add("-stats", false);
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}
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for arg in sess_args {
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add(&(*arg), true);
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}
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