27 lines
1022 B
Diff
27 lines
1022 B
Diff
From b1a99a2a9675f80b7c04a239a6b047373ccf3a17 Mon Sep 17 00:00:00 2001
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From: Alexandre Frade <kernel@xanmod.org>
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Date: Mon, 16 Sep 2024 00:55:35 +0000
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Subject: XANMOD: kbuild: Add GCC SMS-based modulo scheduling flags
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Signed-off-by: Alexandre Frade <kernel@xanmod.org>
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---
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Makefile | 4 ++++
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1 file changed, 4 insertions(+)
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--- a/Makefile
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+++ b/Makefile
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@@ -884,6 +884,13 @@ ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE
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KBUILD_CFLAGS += $(call cc-option,-fivopts)
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endif
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+ifdef CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE_O3
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+# Perform swing modulo scheduling immediately before the first scheduling pass.
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+# This pass looks at innermost loops and reorders their instructions by
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+# overlapping different iterations.
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+KBUILD_CFLAGS += $(call cc-option,-fmodulo-sched -fmodulo-sched-allow-regmoves)
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+endif
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+
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# Always set `debug-assertions` and `overflow-checks` because their default
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# depends on `opt-level` and `debug-assertions`, respectively.
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KBUILD_RUSTFLAGS += -Cdebug-assertions=$(if $(CONFIG_RUST_DEBUG_ASSERTIONS),y,n)
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