[ Reported to the Debian BTS as report #168086. Please CC 168086@bugs.debian.org on replies. Log of report can be found at http://bugs.debian.org/168086 ] The attached testcase ICEs on arm-linux with 3.2 branch 20021212 (-O2 only, not -O). As the 3.3 branch doesn't bootstrap, I cannot check with 3.3. g++-2.95 did work ok, so this is a regression. $ gcc-3.2 -O2 -c bug-168086-3.2.ii GLinkGLvar/FGLvarHigh.C: In member function `virtual void FGLvarHigh::xIdentify(short int)': GLinkGLvar/FGLvarHigh.C:736: Internal compiler error in elimination_effects, at reload1.c:2837 Please submit a full bug report, with preprocessed source if appropriate. See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions. $ gcc-3.2 -O -c bug-168086-3.2.ii $ Release: 3.2.1 (Debian) (Debian unstable) Environment: System: Debian GNU/Linux (unstable) Architecture: arm host: arm-linux Configured with: /home/packages/gcc/3.2/gcc-3.2-3.2.1ds5/src/configure -v --enable-languages=c,c++,java,f77,proto,objc --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-gxx-include-dir=/usr/include/c++/3.2 --enable-shared --with-system-zlib --enable-nls --without-included-gettext --enable-__cxa_atexit --enable-clocale=gnu --enable-java-gc=boehm --enable-objc-gc arm-linux
State-Changed-From-To: open->analyzed State-Changed-Why: The cause of PR 9090 comes from the fact that when we have (insn 127 126 128 1 0x40c653c8 (set (reg:SI 1 r1) (reg:SI 59)) 161 {*arm_movsi_insn} (nil) (expr_list:REG_EQUAL (addressof:SI (reg/v:DI 56) 55 0x40aa48c0) (nil))) purge_addressof_1, when applied to the notes fails to purge the address, instead giving just (insn 127 126 128 1 0x40c653c8 (set (reg:SI 1 r1) (reg:SI 59)) 161 {*arm_movsi_insn} (nil) (expr_list:REG_EQUAL (addressof:SI (mem/s:DI (plus:SI (reg/f:SI 25 sfp) (const_int -16 [0xfffffff0])) [14 S8 A32]) 55 0x40aa48c0) That is, it's pushed the referenced register onto the stack, but then failed to simplify the resulting addressof expression. However, the patch seems so simple that I'm concerned that I've missed somthing obvious. Would someone care to comment? No regressions shown by an arm-elf cross build. <date> Richard Earnshaw <rearnsha@arm.com> * function.c (purge_addressof_1): After pushing an addressed register onto the stack, simplify the result. 2. addressof.patch (text/x-patch) This is a text/x-patch It might be displayable with metamail. (Invoke menu with right button.) Index: function.c =================================================================== RCS file: /cvs/gcc/gcc/gcc/function.c,v retrieving revision 1.392 diff -p -r1.392 function.c *** function.c 10 Jan 2003 02:22:01 -0000 1.392 --- function.c 11 Jan 2003 16:57:16 -0000 *************** purge_addressof_1 (loc, insn, force, sto *** 3007,3016 **** rtx sub, insns; if (GET_CODE (XEXP (x, 0)) != MEM) ! { ! put_addressof_into_stack (x, ht); ! return true; ! } /* We must create a copy of the rtx because it was created by overwriting a REG rtx which is always shared. */ --- 3007,3013 ---- rtx sub, insns; if (GET_CODE (XEXP (x, 0)) != MEM) ! put_addressof_into_stack (x, ht); /* We must create a copy of the rtx because it was created by overwriting a REG rtx which is always shared. */
From: rearnsha@gcc.gnu.org To: gcc-gnats@gcc.gnu.org Cc: Subject: optimization/9090 Date: 27 Jan 2003 10:45:24 -0000 CVSROOT: /cvs/gcc Module name: gcc Branch: gcc-3_3-branch Changes by: rearnsha@gcc.gnu.org 2003-01-27 10:45:24 Modified files: gcc : ChangeLog function.c Log message: PR optimization/9090 * function.c (purge_addressof_1): After pushing an addressed register onto the stack, simplify the result. Patches: http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&only_with_tag=gcc-3_3-branch&r1=1.16114.2.118&r2=1.16114.2.119 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/function.c.diff?cvsroot=gcc&only_with_tag=gcc-3_3-branch&r1=1.389&r2=1.389.2.1
From: rearnsha@gcc.gnu.org To: gcc-gnats@gcc.gnu.org Cc: Subject: optimization/9090 Date: 27 Jan 2003 10:46:49 -0000 CVSROOT: /cvs/gcc Module name: gcc Changes by: rearnsha@gcc.gnu.org 2003-01-27 10:46:47 Modified files: gcc : ChangeLog function.c Log message: PR optimization/9090 * function.c (purge_addressof_1): After pushing an addressed register onto the stack, simplify the result. Patches: http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=1.16523&r2=1.16524 http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/function.c.diff?cvsroot=gcc&r1=1.397&r2=1.398
State-Changed-From-To: analyzed->closed State-Changed-Why: This has been fixed on the trunk and both maintained release branches.