commit: 0bc14fb37320230d55449627a143c97cb187bdf1 Author: Sergei Trofimovich <slyfox <AT> gentoo <DOT> org> AuthorDate: Tue Mar 31 23:07:39 2020 +0000 Commit: Sergei Trofimovich <slyfox <AT> gentoo <DOT> org> CommitDate: Tue Mar 31 23:07:39 2020 +0000 URL: https://gitweb.gentoo.org/proj/gcc-patches.git/commit/?id=0bc14fb3
9.3.0: increase expmed cache size from 10^3 to 10^6 Without this patch is takes dev-libs/xxhash 1-2 hours to compile. With this patch - TODO measurements. It workarounds deficiency of synth_mult() which evics cache entries as it calculates optimal multiplication algorithm. xxhash is especially hevyweight as it's a 64-bit multiplication of large prime constants. Bug: https://gcc.gnu.org/PR87256 Signed-off-by: Sergei Trofimovich <slyfox <AT> gentoo.org> 9.3.0/gentoo/28_all_hppa-faster-synth_mult.patch | 44 ++++++++++++++++++++++++ 9.3.0/gentoo/README.history | 1 + 2 files changed, 45 insertions(+) diff --git a/9.3.0/gentoo/28_all_hppa-faster-synth_mult.patch b/9.3.0/gentoo/28_all_hppa-faster-synth_mult.patch new file mode 100644 index 0000000..e93aa40 --- /dev/null +++ b/9.3.0/gentoo/28_all_hppa-faster-synth_mult.patch @@ -0,0 +1,44 @@ +From 73a841928cc1b86f43108d2383a6242e7e61a785 Mon Sep 17 00:00:00 2001 +From: Sergei Trofimovich <sly...@gentoo.org> +Date: Tue, 31 Mar 2020 23:58:05 +0100 +Subject: [PATCH] gcc/expmed.h: increase cache size from 10^3 to 10^6 + +Without this patch is takes dev-libs/xxhash 1-2 hours +to compile. With this patch - TODO measurements. + +It workarounds deficiency of synth_mult() which evics +cache entries as it calculates optimal multiplication +algorithm. xxhash is especially hevyweight as it's a +64-bit multiplication of large prime constants. + +Bug: https://gcc.gnu.org/PR87256 +Signed-off-by: Sergei Trofimovich <sly...@gentoo.org> +--- + gcc/expmed.h | 13 ++++++++----- + 1 file changed, 8 insertions(+), 5 deletions(-) + +--- a/gcc/expmed.h ++++ b/gcc/expmed.h +@@ -127,11 +127,14 @@ struct alg_hash_entry { + }; + + /* The number of cache/hash entries. */ +-#if HOST_BITS_PER_WIDE_INT == 64 +-#define NUM_ALG_HASH_ENTRIES 1031 +-#else +-#define NUM_ALG_HASH_ENTRIES 307 +-#endif ++/* ++ * Workaround hppa2.0 synth_mult deficiency ++ * and allocate ~1 million slots: ++ * https://gcc.gnu.org/PR87256 ++ * That should increase RAM usage up to ~24MB ++ * per process. ++ */ ++#define NUM_ALG_HASH_ENTRIES 1000003 + + #define NUM_MODE_INT \ + (MAX_MODE_INT - MIN_MODE_INT + 1) +-- +2.26.0 + diff --git a/9.3.0/gentoo/README.history b/9.3.0/gentoo/README.history index e5865d4..5da5a24 100644 --- a/9.3.0/gentoo/README.history +++ b/9.3.0/gentoo/README.history @@ -2,6 +2,7 @@ - 04_all_default-ssp-fix.patch + 04_all_nossp-on-nostdlib.patch + 27_all_default_ssp-buffer-size.patch + + 28_all_hppa-faster-synth_mult.patch 1 12 Mar 2019 + 01_all_default-fortify-source.patch
