diff options
Diffstat (limited to 'configure')
| -rwxr-xr-x | configure | 21 |
1 files changed, 20 insertions, 1 deletions
@@ -6045,7 +6045,26 @@ check_inline_asm inline_asm_nonlocal_labels '"Label:\n"' if enabled aarch64; then as_arch_level="armv8-a" check_as as_arch_directive ".arch $as_arch_level" - enabled as_arch_directive && check_arch_level armv8.2-a + if enabled as_arch_directive; then + # Check for higher .arch levels. We only need armv8.2-a in order to + # enable the extensions we want below - we primarily want to control + # them via .arch_extension. However: + # + # Clang before version 17 (Xcode versions up to and including 15.0) + # didn't support controlling the dotprod/i8mm extensions via + # .arch_extension; thus try to enable them via the .arch level as well. + for level in armv8.2-a armv8.4-a armv8.6-a; do + check_arch_level $level + done + # Clang before version 17 (Xcode versions up to and including 15.0) + # also had a bug (https://github.com/llvm/llvm-project/issues/32220) + # causing a plain ".arch <level>" to not have any effect unless it + # had an extra "+<feature>" included - but it was activate on the next + # ".arch_extension" directive. Check if we can include "+crc" as dummy + # feature to make the .arch directive behave as expected and take + # effect right away. + check_arch_level "${as_arch_level}+crc" + fi enabled armv8 && check_insn armv8 'prfm pldl1strm, [x0]' # internal assembler in clang 3.3 does not support this instruction |