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| author | Szabolcs Nagy <szabolcs.nagy@arm.com> | 2024-03-13 14:34:14 +0000 |
|---|---|---|
| committer | Wilco Dijkstra <wilco.dijkstra@arm.com> | 2024-04-08 16:25:05 +0100 |
| commit | bbc290aad49dbd0f2bec71c2f008c52e3fa62e15 (patch) | |
| tree | d3346b6f484ff72c502a304eb493149b77f6940e | |
| parent | 882b7dc2ab90b3c1280b67aed792142a265d7595 (diff) | |
| download | glibc-bbc290aad49dbd0f2bec71c2f008c52e3fa62e15.tar.gz glibc-bbc290aad49dbd0f2bec71c2f008c52e3fa62e15.tar.xz glibc-bbc290aad49dbd0f2bec71c2f008c52e3fa62e15.zip | |
aarch64: fix check for SVE support in assembler
Due to GCC bug 110901 -mcpu can override -march setting when compiling asm code and thus a compiler targetting a specific cpu can fail the configure check even when binutils gas supports SVE. The workaround is that explicit .arch directive overrides both -mcpu and -march, and since that's what the actual SVE memcpy uses the configure check should use that too even if the GCC issue is fixed independently. Reviewed-by: Florian Weimer <fweimer@redhat.com> (cherry picked from commit 73c26018ed0ecd9c807bb363cc2c2ab4aca66a82)
| -rwxr-xr-x[-rw-r--r--] | sysdeps/aarch64/configure | 5 | ||||
| -rw-r--r-- | sysdeps/aarch64/configure.ac | 5 |
2 files changed, 6 insertions, 4 deletions
diff --git a/sysdeps/aarch64/configure b/sysdeps/aarch64/configure index 2130f6b8f8..19d2b46cbf 100644..100755 --- a/sysdeps/aarch64/configure +++ b/sysdeps/aarch64/configure @@ -307,9 +307,10 @@ if ${libc_cv_aarch64_sve_asm+:} false; then : $as_echo_n "(cached) " >&6 else cat > conftest.s <<\EOF - ptrue p0.b + .arch armv8.2-a+sve + ptrue p0.b EOF -if { ac_try='${CC-cc} -c -march=armv8.2-a+sve conftest.s 1>&5' +if { ac_try='${CC-cc} -c conftest.s 1>&5' { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5 (eval $ac_try) 2>&5 ac_status=$? diff --git a/sysdeps/aarch64/configure.ac b/sysdeps/aarch64/configure.ac index 85c6f76508..bb5adb1782 100644 --- a/sysdeps/aarch64/configure.ac +++ b/sysdeps/aarch64/configure.ac @@ -90,9 +90,10 @@ LIBC_CONFIG_VAR([aarch64-variant-pcs], [$libc_cv_aarch64_variant_pcs]) # Check if asm support armv8.2-a+sve AC_CACHE_CHECK([for SVE support in assembler], [libc_cv_aarch64_sve_asm], [dnl cat > conftest.s <<\EOF - ptrue p0.b + .arch armv8.2-a+sve + ptrue p0.b EOF -if AC_TRY_COMMAND(${CC-cc} -c -march=armv8.2-a+sve conftest.s 1>&AS_MESSAGE_LOG_FD); then +if AC_TRY_COMMAND(${CC-cc} -c conftest.s 1>&AS_MESSAGE_LOG_FD); then libc_cv_aarch64_sve_asm=yes else libc_cv_aarch64_sve_asm=no |