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From: "martin at netbsd dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/58442] bootstrapping vax crashes on NetBSD
Date: Thu, 19 Sep 2013 20:43:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58442

--- Comment #4 from Martin Husemann <martin at netbsd dot org> ---
I stared at the assembly a bit more (but my vax fu is weak):

we are in the last line of

216     #line 781 "../../gcc-4.8.1/gcc/config/vax/vax.md"
217     ((INTVAL (operands[1]) == 8 || INTVAL (operands[1]) == 16)
218        && INTVAL (operands[2]) % INTVAL (operands[1]) == 0
219        && (REG_P (operands[0])
220            || ! mode_dependent_address_p (XEXP (operands[0], 0),
221                                            MEM_ADDR_SPACE (operands[0])))))

and doing:

   0x92cda2 <recog_1(rtx, rtx, int*)+936>:
    movl *0xef3cfc <_GLOBAL_OFFSET_TABLE_+1548>,r0

this is r0 = operands[0]

MEM_ADDR_SPACE(RTX) is get_mem_attrs (RTX)->addrspace) so we do the call:

   0x92cda9 <recog_1(rtx, rtx, int*)+943>:      pushl r0
   0x92cdab <recog_1(rtx, rtx, int*)+945>:
    calls $0x1,0x92c99e <get_mem_attrs(const_rtx)>

and apparently get_mem_attrs(operand[0]) returned 4, which we then deref to
->addrspace and crash.