https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111828
--- Comment #10 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Kewen Lin <li...@gcc.gnu.org>: https://gcc.gnu.org/g:b2075291af8810794c7184fd125b991c2341cb1e commit r14-5142-gb2075291af8810794c7184fd125b991c2341cb1e Author: Kewen Lin <li...@linux.ibm.com> Date: Mon Nov 6 00:14:43 2023 -0600 rs6000: Consider inline asm as safe if no assembler complains [PR111828] As discussed in PR111828, rs6000_update_ipa_fn_target_info is much conservative, currently for any non-empty inline asm, without any parsing, it would take inline asm could have HTM insns. It means for one function attributed with power8 having inline asm, even if it has no HTM insns, we don't make a function attributed with power10 inline it. Peter pointed out an inline asm parser can be a slippery slope, and noticed that the current gnu assembler still allows HTM insns even with power10 machine type, so he suggested that we can aggressively ignore the handling on inline asm, this patch goes for this suggestion. Considering that there are a few assembler alternatives and assembler can update its behaviors (complaining HTM insns at power10 and later cpus sounds reasonable from a certain point of view), this patch also checks assembler complains on HTM insns at power10 or not. For a case that a caller attributed power10 calls a callee attributed power8 having inline asm with HTM insn, without inlining at least the compilation succeeds, but if assembler complains HTM insns at power10, after inlining the compilation would fail. The two associated test cases are fine without and with this patch (effective target takes effect or not). PR target/111828 gcc/ChangeLog: * config.in: Regenerate. * config/rs6000/rs6000.cc (rs6000_update_ipa_fn_target_info): Guard inline asm handling under !HAVE_AS_POWER10_HTM. * configure: Regenerate. * configure.ac: Detect assembler support for HTM insns at power10. gcc/testsuite/ChangeLog: * lib/target-supports.exp (check_effective_target_powerpc_as_p10_htm): New proc. * g++.target/powerpc/pr111828-1.C: New test. * g++.target/powerpc/pr111828-2.C: New test.
