https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82488
--- Comment #3 from Markus Trippelsdorf <trippels at gcc dot gnu.org> --- Author: trippels Date: Mon Nov 27 05:20:43 2017 New Revision: 255159 URL: https://gcc.gnu.org/viewcvs?rev=255159&root=gcc&view=rev Log: Fix PR82488 - signed integer overflow in expr.c bootstrap-ubsan shows: gcc/expr.c:4103:17: runtime error: signed integer overflow: 0 - -9223372036854775808 cannot be represented in type 'long int' Fix by handling the saw_unknown case earlier. PR rtl-optimization/82488 * expr.c (fixup_args_size_notes): Avoid signed integer overflow. diff --git a/gcc/expr.c b/gcc/expr.c index ee07de5aaa44..e9d8555c9452 100644 --- a/gcc/expr.c +++ b/gcc/expr.c @@ -4100,10 +4100,13 @@ fixup_args_size_notes (rtx_insn *prev, rtx_insn *last, int end_args_size) if (STACK_GROWS_DOWNWARD) this_delta = -(unsigned HOST_WIDE_INT) this_delta; - args_size -= this_delta; + if (saw_unknown) + args_size = INT_MIN; + else + args_size -= this_delta; } - return saw_unknown ? INT_MIN : args_size; + return args_size; } #ifdef PUSH_ROUNDING -- Markus Modified: trunk/gcc/ChangeLog trunk/gcc/expr.c