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Subject: [Bug 199450] clang 3.6 crash building lang/spidermonkey
Date: Tue, 14 Apr 2015 19:46:20 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199450

--- Comment #4 from Dimitry Andric <dim@FreeBSD.org> ---
Reduced to just a bit of inline asm:

$ cat toint32.c
// clang -cc1 -triple armv6--freebsd11.0-gnueabihf -emit-obj toint32.c

int ToInt32(double d)
{
    int i;
    unsigned tmp0;
    unsigned tmp1;
    unsigned tmp2;
    asm (
"   mov     %1, %R4, LSR #20\n"
"   bic     %1, %1, #(1 << 11)\n"
"   orr     %R4, %R4, #(1 << 20)\n"
"   sub     %1, %1, #0xff\n"
"   subs    %1, %1, #0x300\n"
"   bmi     8f\n"
"   subs    %3, %1, #52\n"
"   bmi     1f\n"
"   bic     %2, %3, #0xff\n"
"   orr     %3, %3, %2, LSR #3\n"
"   mov     %Q4, %Q4, LSL %3\n"
"   b       2f\n"
"1:\n"
"   rsb     %3, %1, #52\n"
"   mov     %Q4, %Q4, LSR %3\n"
"2:\n"
"   subs    %3, %1, #31\n"
"   mov     %1, %R4, LSL #11\n"
"   bmi     3f\n"
"   bic     %2, %3, #0xff\n"
"   orr     %3, %3, %2, LSR #3\n"
"   mov     %2, %1, LSL %3\n"
"   b       4f\n"
"3:\n"
"   rsb     %3, %3, #0\n"
"   mov     %2, %1, LSR %3\n"
"4:\n"
"   orr     %Q4, %Q4, %2\n"
"   eor     %Q4, %Q4, %R4, ASR #31\n"
"   add     %0, %Q4, %R4, LSR #31\n"
"   b       9f\n"
"8:\n"
"   mov     %0, #0\n"
"9:\n"
    : "=r" (i), "=&r" (tmp0), "=&r" (tmp1), "=&r" (tmp2), "=&r" (d)
    : "4" (d)
    : "cc"
        );
    return i;
}

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