From 2441a5205cbc6f842fe6f9e561e898d70523e991 Mon Sep 17 00:00:00 2001 From: Hans-Peter Nilsson Date: Thu, 17 Jul 2025 05:20:55 +0200 Subject: [PATCH] mmix: Define MAX_FIXED_MODE_SIZE Besides this commit working as a release-branch fix for the PR, code inspection shows slightly better code for TImode libgcc functions, and a modified gcc.c-torture/execute/arith-rand-ll.c (basically s/long long/__int128 and cutting out the non-128-bit cases) shows a 1.4% improvement. (Coremark code is identical, as expected.) PR middle-end/120935 * config/mmix/mmix.h (MAX_FIXED_MODE_SIZE): Define. Co-authored-by: Pietro Monteiro Signed-off-by: Pietro Monteiro --- gcc/config/mmix/mmix.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/gcc/config/mmix/mmix.h b/gcc/config/mmix/mmix.h index 44669e195b4a..354783eccedd 100644 --- a/gcc/config/mmix/mmix.h +++ b/gcc/config/mmix/mmix.h @@ -184,6 +184,9 @@ struct GTY(()) machine_function /* The lower bits are ignored. */ #define STRICT_ALIGNMENT 1 +/* With the default, (64 bits), most things still work, but code for + e.g. __int128 will be suboptimal. */ +#define MAX_FIXED_MODE_SIZE (2 * BITS_PER_WORD) /* Node: Type Layout */ -- 2.47.2