From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 64889 invoked by alias); 13 Oct 2015 09:54:50 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 64859 invoked by uid 48); 13 Oct 2015 09:54:46 -0000 From: "ishiura-compiler at ml dot kwansei.ac.jp" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/67949] New: Regression in GCC-6.0.0's optimizer Date: Tue, 13 Oct 2015 09:54:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: tree-optimization X-Bugzilla-Version: 6.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: ishiura-compiler at ml dot kwansei.ac.jp X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter target_milestone Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2015-10/txt/msg00969.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67949 Bug ID: 67949 Summary: Regression in GCC-6.0.0's optimizer Product: gcc Version: 6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: ishiura-compiler at ml dot kwansei.ac.jp Target Milestone: --- We compiled a program (A.c) by GCC-5.1.0 and GCC-6.0.0 with -O3 option. GCC-5.1.0 performed better optimization than GCC-6.0.0. (A.c) #include int x110 = 0; int main (void) { volatile int x129 = 1; int t0 = 1; t0 = (x129==1)<=(2U^(-(1-x110<<2))); if (t0 == 1) { } else { __builtin_abort(); } return 0; } +-----------------------------------------+-----------------------------------------+ | gcc-5.1.0.s (gcc-5.1.0 A.c -O3 -S) | gcc-6.0.0.s (gcc-6.0.0 A.c -O3 -S) | +-----------------------------------------+-----------------------------------------+ | .globl main | .globl main | | .type main, @function | .type main, @function | |main: |main: | |.LFB23: |.LFB11: | | .cfi_startproc | .cfi_startproc | | movl $1, -4(%rsp) | subq $24, %rsp | | movl -4(%rsp), %eax | .cfi_def_cfa_offset 32 | | | xorl %edx, %edx | | | movl $1, 12(%rsp) | | | movl 12(%rsp), %eax | | | cmpl $1, %eax | | | movl $1, %eax | | | sete %dl | | | subl x110(%rip), %eax | | | sall $2, %eax | | | negl %eax | | | xorl $2, %eax | | | cmpl %eax, %edx | | | ja .L5 | | xorl %eax, %eax | xorl %eax, %eax | | | addq $24, %rsp | | | .cfi_remember_state | | | .cfi_def_cfa_offset 8 | | ret | ret | | |.L5: | | | .cfi_restore_state | | | call abort | | .cfi_endproc | .cfi_endproc | |.LFE23: |.LFE11: | | .size main, .-main | .size main, .-main | | .section .text.unlikely | .section .text.unlikely | |.LCOLDE0: |.LCOLDE0: | | .size x110, 4 | .size x110, 4 | |x110: |x110: | | .zero 4 | .zero 4 | +-----------------------------------------+-----------------------------------------+ Using built-in specs. COLLECT_GCC=gcc-5 COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/5/lto-wrapper Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu 5.1.0-0ubuntu11~14.04.1' --with-bugurl=file:///usr/share/doc/gcc-5/README.Bugs --enable-languages=c,ada,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-5 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=c++98 --enable-gnu-unique-object --disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib --disable-browser-plugin --enable-java-awt=gtk --enable-gtk-cairo --with-java-home=/usr/lib/jvm/java-1.5.0-gcj-5-amd64/jre --enable-java-home --with-jvm-root-dir=/usr/lib/jvm/java-1.5.0-gcj-5-amd64 --with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-5-amd64 --with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar --enable-objc-gc --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 5.1.0 (Ubuntu 5.1.0-0ubuntu11~14.04.1) Using built-in specs. COLLECT_GCC=gcc-6.0.0 COLLECT_LTO_WRAPPER=/home/iwatsuji/opt/gcc-6.0.0/libexec/gcc/x86_64-unknown-linux-gnu/6.0.0/lto-wrapper Target: x86_64-unknown-linux-gnu Configured with: ../gcc-build/gcc-master/configure --prefix=/home/iwatsuji/opt/gcc-6.0.0 --enable-language=c --disable-nls --disable-multilib Thread model: posix gcc version 6.0.0 20150416 (experimental) (GCC)