https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96587
Bug ID: 96587 Summary: [11 Regression] ICE: in extract_constrain_insn, at recog.c:2195 (insn does not satisfy its constraints) with -O2 -fno-dce -fno-tree-forwprop Product: gcc Version: 11.0 Status: UNCONFIRMED Keywords: ice-on-valid-code Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: zsojka at seznam dot cz Target Milestone: --- Host: x86_64-pc-linux-gnu Target: x86_64-pc-linux-gnu Created attachment 49048 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49048&action=edit reduced testcase Compiler output: $ x86_64-pc-linux-gnu-gcc -O2 -fno-dce -fno-tree-forwprop testcase.c testcase.c: In function 'foo': testcase.c:9:1: error: insn does not satisfy its constraints: 9 | } | ^ (insn 94 14 95 2 (parallel [ (set (reg:SI 20 xmm0 [97]) (const_int 0 [0])) (clobber (reg:CC 17 flags)) ]) "testcase.c":7:39 67 {*movsi_xor} (expr_list:REG_UNUSED (reg:CC 17 flags) (nil))) during RTL pass: cprop_hardreg testcase.c:9:1: internal compiler error: in extract_constrain_insn, at recog.c:2195 0x6dab93 _fatal_insn(char const*, rtx_def const*, char const*, int, char const*) /repo/gcc-trunk/gcc/rtl-error.c:108 0x6dac20 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*) /repo/gcc-trunk/gcc/rtl-error.c:118 0x6c9f27 extract_constrain_insn(rtx_insn*) /repo/gcc-trunk/gcc/recog.c:2195 0xf2c81c copyprop_hardreg_forward_1 /repo/gcc-trunk/gcc/regcprop.c:802 0xf2daae execute /repo/gcc-trunk/gcc/regcprop.c:1367 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <https://gcc.gnu.org/bugs/> for instructions. $ x86_64-pc-linux-gnu-gcc -v Using built-in specs. COLLECT_GCC=/repo/gcc-trunk/binary-latest-amd64/bin/x86_64-pc-linux-gnu-gcc COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-r11-2662-20200812081137-g220ffae474d-checking-yes-rtl-df-extra-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/11.0.0/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 --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-r11-2662-20200812081137-g220ffae474d-checking-yes-rtl-df-extra-amd64 Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 11.0.0 20200812 (experimental) (GCC)