http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55116
Bug #: 55116 Summary: [4.8 Regression] LRA failed to decompose ASHIFT Classification: Unclassified Product: gcc Version: 4.8.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: middle-end AssignedTo: unassig...@gcc.gnu.org ReportedBy: hjl.to...@gmail.com CC: ubiz...@gmail.com, vmaka...@redhat.com [hjl@gnu-tools-1 tmp]$ /usr/gcc-4.8.0-x32/bin/gcc -S -O2 -w -S -mx32 /export/gnu/import/git/gcc/gcc/testsuite/gcc.c-torture/execute/builtin-prefetch-3.c -maddress-mode=long /export/gnu/import/git/gcc/gcc/testsuite/gcc.c-torture/execute/builtin-prefetch-3.c: In function ‘expr_vol_global’: /export/gnu/import/git/gcc/gcc/testsuite/gcc.c-torture/execute/builtin-prefetch-3.c:100:1: internal compiler error: in gen_add2_insn, at optabs.c:4694 } ^ 0x81fe4b gen_add2_insn(rtx_def*, rtx_def*) /export/gnu/import/git/gcc/gcc/optabs.c:4694 0x7e2dc7 lra_emit_add(rtx_def*, rtx_def*, rtx_def*) /export/gnu/import/git/gcc/gcc/lra.c:314 0x7eba63 process_addr_reg /export/gnu/import/git/gcc/gcc/lra-constraints.c:1092 0x7ebeed process_address /export/gnu/import/git/gcc/gcc/lra-constraints.c:2290 0x7ef52f curr_insn_transform /export/gnu/import/git/gcc/gcc/lra-constraints.c:2656 0x7f1984 lra_constraints(bool) /export/gnu/import/git/gcc/gcc/lra-constraints.c:3407 0x7e534e lra(_IO_FILE*) /export/gnu/import/git/gcc/gcc/lra.c:2281 0x7ad7f6 do_reload /export/gnu/import/git/gcc/gcc/ira.c:4614 0x7ad7f6 rest_of_handle_reload /export/gnu/import/git/gcc/gcc/ira.c:4720 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <http://gcc.gnu.org/bugs.html> for instructions. [hjl@gnu-tools-1 tmp]$ Breakpoint 1, lra_emit_add (x=0x7ffff1adb440, y=0x7ffff1ae41b0, z=0x7ffff1ad7b00) at /export/gnu/import/git/gcc/gcc/lra.c:313 313 emit_move_insn (x, z); (gdb) call debug_rtx (x) (reg:SI 206) (gdb) call debug_rtx (y) (ashift:SI (reg:SI 96 [ glob_vol_int.22 ]) (const_int 2 [0x2])) (gdb)