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From 73a841928cc1b86f43108d2383a6242e7e61a785 Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyfox@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 <slyfox@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
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