[Bug debug/54694] [4.7/4.8/4.9 Regression] internal compiler error: in dwarf2out_frame_debug_expr, at dwarf2out.c:2387

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54694

--- Comment #14 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Uroš Bizjak from comment #13)
> (In reply to H.J. Lu from comment #12)
> > *** Bug 59763 has been marked as a duplicate of this bug. ***
> 
> Are you sure this is a duplicate? The ICE is at different location and
> adding -mno-avx doesn't help. In fact, -march=corei7 was not used in the
> testcase at all.

This bug is against GCC 4.6. For GCC 4.9, I got

[hjl@gnu-6 pr54694]$ cat x.i 
typedef struct
{
}
floatx80;
register struct CPUX86State *env asm ("ebp");
floatx80 float64_to_floatx80 (int, int);
typedef struct
{
    floatx80 d;
}
FPReg;
struct CPUX86State
{
    FPReg fpregs[0];
};
void
helper_fldl_ST0 ()
{
    env->fpregs[0].d = float64_to_floatx80 (0, 0);
}
[hjl@gnu-6 pr54694]$ make
/export/build/gnu/gcc/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc/build-x86_64-linux/gcc/ -mavx -m32 -S x.i
x.i: In function ‘helper_fldl_ST0’:
x.i:20:1: internal compiler error: in dwarf2out_frame_debug_expr, at
dwarf2cfi.c:1550
 }
 ^
0x766175 dwarf2out_frame_debug_expr
    /export/gnu/import/git/gcc/gcc/dwarf2cfi.c:1548
0x767355 dwarf2out_frame_debug
    /export/gnu/import/git/gcc/gcc/dwarf2cfi.c:2043
0x767e58 scan_insn_after
    /export/gnu/import/git/gcc/gcc/dwarf2cfi.c:2369
0x768414 scan_trace
    /export/gnu/import/git/gcc/gcc/dwarf2cfi.c:2526
0x768527 create_cfi_notes
    /export/gnu/import/git/gcc/gcc/dwarf2cfi.c:2565
0x768ff9 execute_dwarf2_frame
    /export/gnu/import/git/gcc/gcc/dwarf2cfi.c:2925
0x769d40 execute
    /export/gnu/import/git/gcc/gcc/dwarf2cfi.c:3421
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.
make: *** [x.s] Error 1
[hjl@gnu-6 pr54694]$ 

-maccumulate-outgoing-args can be used as a workaround.