From 33054ddd51e0b1e326c6bed02dfb7637dce2cfd7 Mon Sep 17 00:00:00 2001 From: Brandt Bucher Date: Sat, 28 Jun 2025 08:41:00 -0700 Subject: [PATCH 1/2] -Os --- Tools/jit/_targets.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Tools/jit/_targets.py b/Tools/jit/_targets.py index ed10329d25d2f9..69185a6b5984b8 100644 --- a/Tools/jit/_targets.py +++ b/Tools/jit/_targets.py @@ -137,7 +137,7 @@ async def _compile( f"-I{CPYTHON / 'Include' / 'internal' / 'mimalloc'}", f"-I{CPYTHON / 'Python'}", f"-I{CPYTHON / 'Tools' / 'jit'}", - "-O3", + "-Os", "-S", # Shorten full absolute file paths in the generated code (like the # __FILE__ macro and assert failure messages) for reproducibility: From dbca451a9d6f81d833920c67ba4b01ad6bcb8dc8 Mon Sep 17 00:00:00 2001 From: Brandt Bucher Date: Sun, 6 Jul 2025 15:38:27 -0700 Subject: [PATCH 2/2] Add comment explaining -Os --- Tools/jit/_targets.py | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Tools/jit/_targets.py b/Tools/jit/_targets.py index 69185a6b5984b8..728f48128ce79c 100644 --- a/Tools/jit/_targets.py +++ b/Tools/jit/_targets.py @@ -137,6 +137,14 @@ async def _compile( f"-I{CPYTHON / 'Include' / 'internal' / 'mimalloc'}", f"-I{CPYTHON / 'Python'}", f"-I{CPYTHON / 'Tools' / 'jit'}", + # -O2 and -O3 include some optimizations that make sense for + # standalone functions, but not for snippets of code that are going + # to be laid out end-to-end (like ours)... common examples include + # passes like tail-duplication, or aligning jump targets with nops. + # -Os is equivalent to -O2 with many of these problematic passes + # disabled. Based on manual review, for *our* purposes it usually + # generates better code than -O2 (and -O2 usually generates better + # code than -O3). As a nice benefit, it uses less memory too: "-Os", "-S", # Shorten full absolute file paths in the generated code (like the pFad - Phonifier reborn

Pfad - The Proxy pFad of © 2024 Garber Painting. All rights reserved.

Note: This service is not intended for secure transactions such as banking, social media, email, or purchasing. Use at your own risk. We assume no liability whatsoever for broken pages.


Alternative Proxies:

Alternative Proxy

pFad Proxy

pFad v3 Proxy

pFad v4 Proxy