[Bug gdb/34416] Incorrect loss of sign in 64-bit multiply (e.g.: DW_OP_mul in DWARF evaluation)

https://sourceware.org/bugzilla/show_bug.cgi?id=34416

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2026-07-21
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |NEW

--- Comment #3 from Tom Tromey <tromey at sourceware dot org> ---
I couldn't try your test program, so instead I hacked the dw2-const.exp
test case to use this DWARF expression:

                DW_AT_location {
                    DW_OP_const8u 0x61e2c0df6f7857a5
                    DW_OP_const8u 0xff51afd7ed558ccd
                    DW_OP_mul
                    DW_OP_stack_value
                } SPECIAL_expr

Then if I run it and print the variable I do see the same result you get:

(gdb) print/x val8
$2 = 0xbf5e897211ea94df

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