mstorsjo added a comment. In D87188#2447958 <https://reviews.llvm.org/D87188#2447958>, @lebedev.ri wrote:
> Just to be sure, i just run the entire compilation of `vc1_block-aarch64.c` > through alive2, and as far as i can tell, it did not report any IR-level > miscompilations. > So either the original code has bugs/UB's/whatever, or this is an AArch64 > backend bug (cc @t.p.northover), or the IR problem is in a place alive2 can't > find. FWIW, the testcase does run without any remarks in ubsan at least... I retried the issue now, and I've reduced it down to one standalone function that causes the errors. https://martin.st/temp/vc1_block-p-block2.c is this function separated into a standalone translation unit - that I can run in the test framework. Unfortunately, the rather small difference further up in the optimization chain cascades into quite a lot of differences at the end, and I don't know really where to go from there to pinpoint the issue. Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D87188/new/ https://reviews.llvm.org/D87188 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
