87 lines
2.9 KiB
Diff
87 lines
2.9 KiB
Diff
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From da22606529688b125e6e08589a6dfe741b8dd18d Mon Sep 17 00:00:00 2001
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From: Yang Yujie <yangyujie@loongson.cn>
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Date: Mon, 28 Aug 2023 10:20:12 +0800
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Subject: [PATCH 060/124] LoongArch: add new configure option
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--with-strict-align-lib
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LoongArch processors may not support memory accesses without natural
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alignments. Building libraries with -mstrict-align may help with
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toolchain binary compatiblity and performance on these implementations
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(e.g. Loongson 2K1000LA).
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No significant performance degredation is observed on current mainstream
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LoongArch processors when the option is enabled.
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gcc/ChangeLog:
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* config.gcc: use -mstrict-align for building libraries
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if --with-strict-align-lib is given.
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* doc/install.texi: likewise.
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Signed-off-by: Peng Fan <fanpeng@loongson.cn>
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Signed-off-by: ticat_fp <fanpeng@loongson.cn>
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---
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gcc/config.gcc | 16 +++++++++++++++-
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gcc/doc/install.texi | 4 ++++
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2 files changed, 19 insertions(+), 1 deletion(-)
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diff --git a/gcc/config.gcc b/gcc/config.gcc
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index 62525c296..16bbaea45 100644
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--- a/gcc/config.gcc
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+++ b/gcc/config.gcc
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@@ -4966,7 +4966,7 @@ case "${target}" in
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;;
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loongarch*-*)
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- supported_defaults="abi arch tune fpu simd multilib-default"
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+ supported_defaults="abi arch tune fpu simd multilib-default strict-align-lib"
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# Local variables
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unset \
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@@ -5163,6 +5163,17 @@ case "${target}" in
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;;
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esac
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+ # Build libraries with -mstrict-align if --with-strict-align-lib is given.
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+ case ${with_strict_align_lib} in
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+ yes) strict_align_opt="/mstrict-align" ;;
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+ ""|no) ;;
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+ *)
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+ echo "Unknown option: --with-strict-align-lib=${with_strict_align_lib}" 1>&2
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+ exit 1
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+ ;;
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+ esac
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+
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+
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# Handle --with-multilib-default
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if echo "${with_multilib_default}" \
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| grep -E -e '[[:space:]]' -e '//' -e '/$' -e '^/' > /dev/null 2>&1; then
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@@ -5324,6 +5335,9 @@ case "${target}" in
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;;
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esac
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+ # Use mstrict-align for building libraries if --with-strict-align-lib is given.
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+ loongarch_multilib_list_make="${loongarch_multilib_list_make}${strict_align_opt}"
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+
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# Check for repeated configuration of the same multilib variant.
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if echo "${elem_abi_base}/${elem_abi_ext}" \
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| grep -E "^(${all_abis%|})$" >/dev/null 2>&1; then
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diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi
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index 1fc5f0bfa..a8851e8bd 100644
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--- a/gcc/doc/install.texi
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+++ b/gcc/doc/install.texi
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@@ -1353,6 +1353,10 @@ Multiple @var{option}s may appear consecutively while @var{arch} may only
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appear in the beginning or be omitted (which means @option{-march=abi-default}
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is applied when building the libraries).
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+@item --with-strict-align-lib
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+On LoongArch targets, build all enabled multilibs with @option{-mstrict-align}
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+(Not enabled by default).
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+
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@item --with-multilib-generator=@var{config}
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Specify what multilibs to build. @var{config} is a semicolon separated list of
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values, possibly consisting of a single value. Currently only implemented
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--
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2.33.0
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