[Bug target/115342] [14/15 Regression] AArch64: Function multiversioning initialization incorrect
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115342 Wilco changed: What|Removed |Added Resolution|--- |FIXED Status|ASSIGNED|RESOLVED --- Comment #5 from Wilco --- Fixed on trunk and gcc-14 branch.
[Bug target/115342] [14/15 Regression] AArch64: Function multiversioning initialization incorrect
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115342 --- Comment #4 from GCC Commits --- The releases/gcc-14 branch has been updated by Wilco Dijkstra : https://gcc.gnu.org/g:9421f02916676d27e24fcda918f85e359329ac69 commit r14-10338-g9421f02916676d27e24fcda918f85e359329ac69 Author: Wilco Dijkstra Date: Wed Jun 5 14:04:33 2024 +0100 AArch64: Fix cpu features initialization [PR115342] The CPU features initialization code uses CPUID registers (rather than HWCAP). The equality comparisons it uses are incorrect: for example FEAT_SVE is not set if SVE2 is available. Using HWCAPs for these is both simpler and correct. The initialization must also be done atomically to avoid multiple threads causing corruption due to non-atomic RMW accesses to the global. libgcc: PR target/115342 * config/aarch64/cpuinfo.c (__init_cpu_features_constructor): Use HWCAP where possible. Use atomic write for initialization. Fix FEAT_PREDRES comparison. (__init_cpu_features_resolver): Use atomic load for correct initialization. (__init_cpu_features): Likewise. (cherry picked from commit d7cbcfe7c33645eaf95f175f19884d443817857b)
[Bug target/115342] [14/15 Regression] AArch64: Function multiversioning initialization incorrect
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115342 Wilco changed: What|Removed |Added Status|NEW |ASSIGNED --- Comment #3 from Wilco --- (In reply to Ramana Radhakrishnan from comment #2) > Confirmed ? And fixed on trunk. Will do the backport later.
[Bug target/115342] [14/15 Regression] AArch64: Function multiversioning initialization incorrect
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115342 Ramana Radhakrishnan changed: What|Removed |Added CC||ramana at gcc dot gnu.org Ever confirmed|0 |1 Status|UNCONFIRMED |NEW Last reconfirmed||2024-06-20 --- Comment #2 from Ramana Radhakrishnan --- Confirmed ?
[Bug target/115342] [14/15 Regression] AArch64: Function multiversioning initialization incorrect
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115342 --- Comment #1 from GCC Commits --- The master branch has been updated by Wilco Dijkstra : https://gcc.gnu.org/g:d7cbcfe7c33645eaf95f175f19884d443817857b commit r15-1036-gd7cbcfe7c33645eaf95f175f19884d443817857b Author: Wilco Dijkstra Date: Wed Jun 5 14:04:33 2024 +0100 AArch64: Fix cpu features initialization [PR115342] The CPU features initialization code uses CPUID registers (rather than HWCAP). The equality comparisons it uses are incorrect: for example FEAT_SVE is not set if SVE2 is available. Using HWCAPs for these is both simpler and correct. The initialization must also be done atomically to avoid multiple threads causing corruption due to non-atomic RMW accesses to the global. libgcc: PR target/115342 * config/aarch64/cpuinfo.c (__init_cpu_features_constructor): Use HWCAP where possible. Use atomic write for initialization. Fix FEAT_PREDRES comparison. (__init_cpu_features_resolver): Use atomic load for correct initialization. (__init_cpu_features): Likewise.
[Bug target/115342] [14/15 Regression] AArch64: Function multiversioning initialization incorrect
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115342 Richard Biener changed: What|Removed |Added Target Milestone|--- |14.2
