From 2d47816cbaebb3b8f400b11fa122feae00fd5c58 Mon Sep 17 00:00:00 2001
From: Patrick Walton <pcwalton@fb.com>
Date: Sat, 5 Nov 2022 01:08:57 -0700
Subject: 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
---
 compiler/rustc_codegen_ssa/src/back/write.rs | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'compiler/rustc_codegen_ssa/src/back/write.rs')

diff --git a/compiler/rustc_codegen_ssa/src/back/write.rs b/compiler/rustc_codegen_ssa/src/back/write.rs
index ececa29b231..0ce6129a462 100644
--- a/compiler/rustc_codegen_ssa/src/back/write.rs
+++ b/compiler/rustc_codegen_ssa/src/back/write.rs
@@ -1945,6 +1945,10 @@ impl<B: ExtraBackendMethods> OngoingCodegen<B> {
             self.backend.print_pass_timings()
         }
 
+        if sess.print_llvm_stats() {
+            self.backend.print_statistics()
+        }
+
         (
             CodegenResults {
                 metadata: self.metadata,
-- 
cgit 1.4.1-3-g733a5