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Subject: [Bug target/66754] [4.9/5/6] gcc.dg/builtin-apply2.c aborts with -m32 -mregparm=3 or -miamcu
Date: Sat, 04 Jul 2015 02:37:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66754

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
Here is a testcase without -mregparm=N:

[hjl@gnu-tools-1 pr66754]$ cat x.i
extern void abort(void);

typedef double __v2df __attribute__ ((__vector_size__ (16)));
__v2df val;

void
foo (char *name, __v2df x, __v2df y, __v2df z)
{
  if (!__builtin_ia32_comisdeq (z, val))
    abort();
}

void
bar (char *name, ...)
{
  __builtin_apply(foo, __builtin_apply_args(), 64);
}

int main(void)
{
  __v2df x = { 3.1, 3.2 };
  __v2df y = { 2.1, 5.2 };
  __v2df z = { 1.1, 7.2 };
  val = z;
  bar("eeee", x, y, z);

  return 0;
}
[hjl@gnu-tools-1 pr66754]$ make
/export/build/gnu/gcc/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc/build-x86_64-linux/gcc/ -m32 -msse2 -S -o x.s x.i
/export/build/gnu/gcc/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/gcc/build-x86_64-linux/gcc/ -g -m32 -msse2 -o x x.s
./x
Makefile:12: recipe for target 'all' failed
make: *** [all] Aborted (core dumped)
[hjl@gnu-tools-1 pr66754]$ 

The vector parameters have the same issue.  All arguments of vararg
functions argument are passed on stack while the first 3 vector arguments
are passed in registers for non-vararg functions.