Created attachment 50793 [details] auto-reduced testcase (from OpenTTD sources) Compiler output: $ x86_64-pc-linux-gnu-gcc -O3 -fno-expensive-optimizations -fno-tree-dce -fno-tree-dominator-opts -fcompare-debug testcase.C -save-temps x86_64-pc-linux-gnu-gcc: error: testcase.C: '-fcompare-debug' failure (length) $ diff -u *.gkd --- a-testcase.C.gkd 2021-05-11 21:38:59.070437639 +0200 +++ a-testcase.gk.C.gkd 2021-05-11 21:38:59.103770789 +0200 @@ -93,7 +93,7 @@ (mult:SI (mem/c:SI (symbol_ref:DI ("y") [flags 0x2] <var_decl # y>) [ y+0 S4 A32]) (const_int -1431655765 [0xffffffffaaaaaaab]))) (clobber (reg:CC 17 flags)) - ])# {*mulsi3_1} + ]) "testcase.C":8:5# {*mulsi3_1} (expr_list:REG_UNUSED (reg:CC 17 flags) (nil))) (insn:TI # 0 0 7 (parallel [ @@ -101,7 +101,7 @@ (plus:SI (reg:SI 0 ax [113]) (const_int 715827882 [0x2aaaaaaa]))) (clobber (reg:CC 17 flags)) - ])# {*addsi_1} + ]) "testcase.C":8:5# {*addsi_1} (expr_list:REG_UNUSED (reg:CC 17 flags) (nil))) (insn:TI # 0 0 7 (set (reg:CC 17 flags) @@ -163,7 +163,7 @@ (mult:SI (mem/c:SI (symbol_ref:DI ("y") [flags 0x2] <var_decl # y>) [ y+0 S4 A32]) (const_int -1431655765 [0xffffffffaaaaaaab]))) (clobber (reg:CC 17 flags)) - ])# {*mulsi3_1} + ]) "testcase.C":17:1# {*mulsi3_1} (expr_list:REG_UNUSED (reg:CC 17 flags) (nil))) (insn:TI # 0 0 10 (parallel [ @@ -171,7 +171,7 @@ (plus:SI (reg:SI 0 ax [100]) (const_int 715827882 [0x2aaaaaaa]))) (clobber (reg:CC 17 flags)) - ])# {*addsi_1} + ]) "testcase.C":17:1# {*addsi_1} (expr_list:REG_UNUSED (reg:CC 17 flags) (nil))) (insn:TI # 0 0 10 (set (reg:CC 17 flags) $ x86_64-pc-linux-gnu-gcc -v Using built-in specs. COLLECT_GCC=/repo/gcc-trunk/binary-latest/bin/x86_64-pc-linux-gnu-gcc COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r12-727-20210511185432-g3e3fdf3d521-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/12.0.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++ --enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra --disable-bootstrap --with-cloog --with-ppl --with-isl --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu --target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld --with-as=/usr/bin/x86_64-pc-linux-gnu-as --disable-libstdcxx-pch --prefix=/repo/gcc-trunk//binary-trunk-r12-727-20210511185432-g3e3fdf3d521-checking-yes-rtl-df-extra-nobootstrap-amd64 Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 12.0.0 20210511 (experimental) (GCC)
Created attachment 50833 [details] another testcase (needs less compiler flags) $ x86_64-pc-linux-gnu-gcc -O2 -fno-tree-dce -fno-tree-dominator-opts -fcompare-debug aircraft_cmd.ii -save-temps x86_64-pc-linux-gnu-gcc: error: aircraft_cmd.ii: '-fcompare-debug' failure (length) $ diff -u *gkd --- a-aircraft_cmd.gk.ii.gkd 2021-05-18 08:56:42.271670788 +0200 +++ a-aircraft_cmd.ii.gkd 2021-05-18 08:56:42.191670787 +0200 @@ -65,7 +65,7 @@ (mult:HI (reg:HI 0 ax [orig:89 pretmp_31 ] [89]) (const_int -21845 [0xffffffffffffaaab]))) (clobber (reg:CC 17 flags)) - ]) "aircraft_cmd.ii":18:19# {*mulhi3_1} + ])# {*mulhi3_1} (expr_list:REG_UNUSED (reg:CC 17 flags) (nil))) (insn:TI # 0 0 4 (parallel [ @@ -73,7 +73,7 @@ (plus:HI (reg:HI 0 ax [101]) (const_int 10922 [0x2aaa]))) (clobber (reg:CC 17 flags)) - ]) "aircraft_cmd.ii":18:19# {*addhi_1} + ])# {*addhi_1} (expr_list:REG_UNUSED (reg:CC 17 flags) (nil))) (insn:TI # 0 0 4 (set (reg:CC 17 flags)
Started with r12-630 and got fixed with r12-4531-g972ee845f54839e9bd2e4611bb268d75440f3845 So this looks to be a dup of PR102764. We might want to add the testcases into the testsuite though. *** This bug has been marked as a duplicate of bug 102764 ***
Note, the #c1 testcase started to fail also with r12-630 but went latent with r12-2591.
The master branch has been updated by Jakub Jelinek <jakub@gcc.gnu.org>: https://gcc.gnu.org/g:5f2e72db8c03c960d8330305c1e92986373198ca commit r12-7446-g5f2e72db8c03c960d8330305c1e92986373198ca Author: Jakub Jelinek <jakub@redhat.com> Date: Wed Mar 2 10:38:39 2022 +0100 testsuite: Add testcases for already fixed PR [PR100541] These testcases started failing with r12-630 and one of them got fixed with r12-4531 (aka PR102764 fix and r12-4616 further improved the fix) and the other went latent in r12-2591 (i.e. threader changes) and I believe was fixed for real by the PR102764 fix too. 2022-03-02 Jakub Jelinek <jakub@redhat.com> PR debug/100541 * g++.dg/opt/pr100541-1.C: New test. * g++.dg/opt/pr100541-2.C: New test.