https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104307
Bug ID: 104307 Summary: [11/12 Regression] '-fcompare-debug' failure (length) w/ -mavx512f -O2 Product: gcc Version: 12.0 Status: UNCONFIRMED Keywords: compare-debug-failure Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: asolokha at gmx dot com Target Milestone: --- Target: x86_64-unknown-linux-gnu Created attachment 52319 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52319&action=edit gkd diff gcc 12.0.1 20220123 snapshot (g:2da90ad39bf8fa9ee287e040d1f4411cb7a2e7ed) fails -fcompare-debug check when compiling gcc/testsuite/gcc.target/i386/pr78669.c w/ -Os -funroll-loops: % x86_64-unknown-linux-gnu-gcc-12.0.1 -mavx512f -O2 -fcompare-debug -gno-statement-frontiers -c gcc/testsuite/gcc.target/i386/pr78669.c x86_64-unknown-linux-gnu-gcc-12.0.1: error: gcc/testsuite/gcc.target/i386/pr78669.c: '-fcompare-debug' failure (length) gkd diff attached. -fcompare-debug check also fails w/o -mavx512f, though the diff is different. If I get the dumps right, this issue is not related to PR104054, as things already start looking interesting since veclower21 tree dump.