https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100809
Bug ID: 100809 Summary: PPC: __int128 divide/modulo does not use P10 instructions vdivsq/vdivuq Product: gcc Version: 10.2.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ Assignee: unassigned at gcc dot gnu.org Reporter: jens.seifert at de dot ibm.com Target Milestone: --- unsigned __int128 div(unsigned __int128 a, unsigned __int128 b) { return a/b; } __int128 div(__int128 a, __int128 b) { return a/b; } gcc -mcpu=power10 -save-temps -O2 int128.C Output: _Z3divoo: .LFB0: .cfi_startproc .localentry _Z3divoo,1 mflr 0 std 0,16(1) stdu 1,-32(1) .cfi_def_cfa_offset 32 .cfi_offset 65, 16 bl __udivti3@notoc addi 1,1,32 .cfi_def_cfa_offset 0 ld 0,16(1) mtlr 0 .cfi_restore 65 blr .long 0 .byte 0,9,0,1,128,0,0,0 .cfi_endproc .LFE0: .size _Z3divoo,.-_Z3divoo .globl __divti3 .align 2 .p2align 4,,15 .globl _Z3divnn .type _Z3divnn, @function _Z3divnn: .LFB1: .cfi_startproc .localentry _Z3divnn,1 mflr 0 std 0,16(1) stdu 1,-32(1) .cfi_def_cfa_offset 32 .cfi_offset 65, 16 bl __divti3@notoc addi 1,1,32 .cfi_def_cfa_offset 0 ld 0,16(1) mtlr 0 .cfi_restore 65 blr .long 0 .byte 0,9,0,1,128,0,0,0 .cfi_endproc Expected is the use of vdivsq/vdivuq. GCC version: /opt/rh/devtoolset-10/root/usr/bin/gcc -v Using built-in specs. COLLECT_GCC=/opt/rh/devtoolset-10/root/usr/bin/gcc COLLECT_LTO_WRAPPER=/opt/rh/devtoolset-10/root/usr/libexec/gcc/ppc64le-redhat-linux/10/lto-wrapper Target: ppc64le-redhat-linux Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,lto --prefix=/opt/rh/devtoolset-10/root/usr --mandir=/opt/rh/devtoolset-10/root/usr/share/man --infodir=/opt/rh/devtoolset-10/root/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-targets=powerpcle-linux --disable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --with-linker-hash-style=gnu --with-default-libstdcxx-abi=gcc4-compatible --enable-plugin --enable-initfini-array --with-isl=/builddir/build/BUILD/gcc-10.2.1-20200804/obj-ppc64le-redhat-linux/isl-install --disable-libmpx --enable-gnu-indirect-function --enable-secureplt --with-long-double-128 --with-cpu-32=power8 --with-tune-32=power8 --with-cpu-64=power8 --with-tune-64=power8 --build=ppc64le-redhat-linux Thread model: posix Supported LTO compression algorithms: zlib gcc version 10.2.1 20200804 (Red Hat 10.2.1-2) (GCC)