[Bug target/59343] New: miscompiled for loop in sh4 target (-Os)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59343 Bug ID: 59343 Summary: miscompiled for loop in sh4 target (-Os) Product: gcc Version: 4.8.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: gcc-bugzilla-f5d8 at theblacksun dot eu Created attachment 31327 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31327&action=edit miscompilation testcase The attached testcase miscompiles on sh4 target if build with -Os $ sh4-unknown-linux-gnu-g++ -Wall -Wextra -o for_loop_miscompile_O2 -O2 for_loop_miscompile.cpp $ sh4-unknown-linux-gnu-g++ -Wall -Wextra -o for_loop_miscompile_Os -Os for_loop_miscompile.cpp target $ ./for_loop_miscompile_O2 teststring = 0x411068 teststring = 0x411068 target $ ./for_loop_miscompile_Os teststring = 0x411068 teststring = 0x1
[Bug target/59343] miscompiled for loop in sh4 target (-Os)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59343 --- Comment #2 from gcc-bugzilla-f5d8 at theblacksun dot eu --- Created attachment 31330 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31330&action=edit assembler output from -O2
[Bug target/59343] miscompiled for loop in sh4 target (-Os)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59343 --- Comment #1 from gcc-bugzilla-f5d8 at theblacksun dot eu --- Created attachment 31329 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31329&action=edit assembler output from -Os
[Bug target/59343] miscompiled for loop in sh4 target (-Os)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59343 --- Comment #3 from gcc-bugzilla-f5d8 at theblacksun dot eu --- Created attachment 31349 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31349&action=edit Second failing testcase. Triggers in -O1 and -O2 too
[Bug target/59343] miscompiled for loop in sh4 target (-Os)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59343 gcc-bugzilla-f5d8 at theblacksun dot eu changed: What|Removed |Added Target||sh4-unknown-linux-gnu --- Comment #4 from gcc-bugzilla-f5d8 at theblacksun dot eu --- Using the second testcase the compiler also misbehaves: $ sh4-unknown-linux-gnu-g++ -Wall -Wextra -static -o testcase2_O2 -O2 testcase2.cpp $ sh4-unknown-linux-gnu-g++ -Wall -Wextra -static -o testcase2_O1 -O1 testcase2.cpp $ sh4-unknown-linux-gnu-g++ -Wall -Wextra -static -o testcase2_O0 -O0 testcase2.cpp $ sh4-unknown-linux-gnu-g++ -Wall -Wextra -static -o testcase2_Os -Os testcase2.cpp $ qemu-sh4 ./testcase2_00 flag1 is true... flag2?: 0 $ qemu-sh4 ./testcase2_01 flag1 is true... flag2?: 0 flag2 is true $ qemu-sh4 ./testcase2_02 flag1 is true... flag2?: 0 flag2 is true $ qemu-sh4 ./testcase2_0s flag1 is true... flag2?: 0 flag2 is true
[Bug target/59343] miscompiled for loop in sh4 target (-Os)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59343 gcc-bugzilla-f5d8 at theblacksun dot eu changed: What|Removed |Added Known to work||4.7.3 --- Comment #6 from gcc-bugzilla-f5d8 at theblacksun dot eu --- I tested your patch and it fixes the problem for me. Thanks for the quick feedback. Meanwhile I tested gcc 4.7.3. I cannot reproduce the miscompilation there.
