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| author | Yang Yujie <yangyujie@loongson.cn> | 2023-08-28 10:20:12 +0800 |
|---|---|---|
| committer | Lulu Cheng <chenglulu@loongson.cn> | 2023-09-05 11:48:05 +0800 |
| commit | 18e2e589eefc9ac96a75ff890cf883f754b163e4 (patch) | |
| tree | 5e2fc4d62335ecd148131915e358ba25fe0d8563 /gcc | |
| parent | f095da2c5a452df7a7e184e0dcb5bb1538dd9086 (diff) | |
| download | gcc-18e2e589eefc9ac96a75ff890cf883f754b163e4.zip gcc-18e2e589eefc9ac96a75ff890cf883f754b163e4.tar.gz gcc-18e2e589eefc9ac96a75ff890cf883f754b163e4.tar.bz2 | |
LoongArch: add new configure option --with-strict-align-lib
LoongArch processors may not support memory accesses without natural
alignments. Building libraries with -mstrict-align may help with
toolchain binary compatiblity and performance on these implementations
(e.g. Loongson 2K1000LA).
No significant performance degredation is observed on current mainstream
LoongArch processors when the option is enabled.
gcc/ChangeLog:
* config.gcc: use -mstrict-align for building libraries
if --with-strict-align-lib is given.
* doc/install.texi: likewise.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/config.gcc | 16 | ||||
| -rw-r--r-- | gcc/doc/install.texi | 4 |
2 files changed, 19 insertions, 1 deletions
diff --git a/gcc/config.gcc b/gcc/config.gcc index 543b0ba..89af167 100644 --- a/gcc/config.gcc +++ b/gcc/config.gcc @@ -4892,7 +4892,7 @@ case "${target}" in ;; loongarch*-*) - supported_defaults="abi arch tune fpu simd multilib-default" + supported_defaults="abi arch tune fpu simd multilib-default strict-align-lib" # Local variables unset \ @@ -5089,6 +5089,17 @@ case "${target}" in ;; esac + # Build libraries with -mstrict-align if --with-strict-align-lib is given. + case ${with_strict_align_lib} in + yes) strict_align_opt="/mstrict-align" ;; + ""|no) ;; + *) + echo "Unknown option: --with-strict-align-lib=${with_strict_align_lib}" 1>&2 + exit 1 + ;; + esac + + # Handle --with-multilib-default if echo "${with_multilib_default}" \ | grep -E -e '[[:space:]]' -e '//' -e '/$' -e '^/' > /dev/null 2>&1; then @@ -5250,6 +5261,9 @@ case "${target}" in ;; esac + # Use mstrict-align for building libraries if --with-strict-align-lib is given. + loongarch_multilib_list_make="${loongarch_multilib_list_make}${strict_align_opt}" + # Check for repeated configuration of the same multilib variant. if echo "${elem_abi_base}/${elem_abi_ext}" \ | grep -E "^(${all_abis%|})$" >/dev/null 2>&1; then diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi index bbc58cb..31f2234 100644 --- a/gcc/doc/install.texi +++ b/gcc/doc/install.texi @@ -1416,6 +1416,10 @@ Multiple @var{option}s may appear consecutively while @var{arch} may only appear in the beginning or be omitted (which means @option{-march=abi-default} is applied when building the libraries). +@item --with-strict-align-lib +On LoongArch targets, build all enabled multilibs with @option{-mstrict-align} +(Not enabled by default). + @item --with-multilib-generator=@var{config} Specify what multilibs to build. @var{config} is a semicolon separated list of values, possibly consisting of a single value. Currently only implemented |