https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101332
Bug ID: 101332 Summary: [12 Regression] FAIL: g++.dg/opt/pr91838.C Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: hjl.tools at gmail dot com CC: crazylht at gmail dot com Target Milestone: --- Target: x86-64 On x86-64, r12-1764 caused FAIL: g++.dg/opt/pr91838.C with -march=skylake-avx512: [hjl@gnu-skx-1 g++]$ gcc -S /export/gnu/import/git/gitlab/x86-gcc/gcc/testsuite/g++.dg/opt/pr91838.C -O2 -Wno-psabi -march=skylake-avx512 [hjl@gnu-skx-1 g++]$ cat pr91838.s .file "pr91838.C" .text .p2align 4 .globl _Z1fDv8_h .type _Z1fDv8_h, @function _Z1fDv8_h: .LFB0: .cfi_startproc vpxor %xmm0, %xmm0, %xmm0 ret .cfi_endproc .LFE0: .size _Z1fDv8_h, .-_Z1fDv8_h .ident "GCC: (GNU) 11.1.1 20210531 (Red Hat 11.1.1-3)" .section .note.GNU-stack,"",@progbits [hjl@gnu-skx-1 g++]$ /export/users/hjl/build/gnu/tools-build/gcc-gitlab-native/build-x86_64-linux/gcc/testsuite/g++8/../../xg++ -B/export/users/hjl/build/gnu/tools-build/gcc-gitlab-native/build-x86_64-linux/gcc/testsuite/g++8/../../ /export/gnu/import/git/gitlab/x86-gcc/gcc/testsuite/g++.dg/opt/pr91838.C -fdiagnostics-plain-output -nostdinc++ -I/export/users/hjl/build/gnu/tools-build/gcc-gitlab-native/build-x86_64-linux/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu -I/export/users/hjl/build/gnu/tools-build/gcc-gitlab-native/build-x86_64-linux/x86_64-pc-linux-gnu/libstdc++-v3/include -I/export/gnu/import/git/gitlab/x86-gcc/libstdc++-v3/libsupc++ -I/export/gnu/import/git/gitlab/x86-gcc/libstdc++-v3/include/backward -I/export/gnu/import/git/gitlab/x86-gcc/libstdc++-v3/testsuite/util -fmessage-length=0 -std=c++2a -pedantic-errors -Wno-long-long -O2 -Wno-psabi -w -masm=att -ffat-lto-objects -fno-ident -S -o pr91838.s -march=skylake-avx512 [hjl@gnu-skx-1 g++]$ cat pr91838.s .file "pr91838.C" .text .p2align 4 .globl _Z1fDv8_h .type _Z1fDv8_h, @function _Z1fDv8_h: .LFB0: .cfi_startproc movl $2056, %eax vmovd %eax, %xmm2 vpshuflw $0, %xmm2, %xmm1 vpmovzxbw %xmm1, %xmm1 vpmovzxbw %xmm0, %xmm0 vpsrlvw %xmm1, %xmm0, %xmm0 vpmovwb %xmm0, %xmm0 ret .cfi_endproc .LFE0: .size _Z1fDv8_h, .-_Z1fDv8_h .section .note.GNU-stack,"",@progbits [hjl@gnu-skx-1 g++]$