[Bug libc/18661] New: Some x86-64 assembly codes don't align stack to 16 bytes

["hjl.tools at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18661

            Bug ID: 18661
           Summary: Some x86-64 assembly codes don't align stack to 16
                    bytes
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: hjl.tools at gmail dot com
                CC: drepper.fsp at gmail dot com
  Target Milestone: ---

Some x86-64 assembly codes don't align stack to 16 bytes, which
lead to

(gdb) r
Starting program:
/export/build/gnu/glibc-test/build-x86_64-linux/math/test-float-vlen4 
testing float vector math (without inline functions)

Program received signal SIGSEGV, Segmentation fault.
_dl_runtime_resolve () at ../sysdeps/x86_64/dl-trampoline.S:89
89              movaps %xmm0, REGISTER_SAVE_XMM0(%rsp)
(gdb) bt
#0  _dl_runtime_resolve () at ../sysdeps/x86_64/dl-trampoline.S:89
#1  0x00007ffff7b0d447 in cosf () at ../sysdeps/x86_64/fpu/s_cosf.S:314
#2  0x00007ffff78ba498 in _ZGVbN4v_cosf_sse4 ()
    at ../sysdeps/x86_64/fpu/multiarch/svml_s_cosf4_core_sse4.S:223
#3  0x0000000000403764 in cosf_vlen4 (x=<optimized out>)
    at ../sysdeps/x86_64/fpu/test-float-vlen4-wrappers.c:24
#4  0x0000000000402f62 in cos_test ()
    at /export/build/gnu/glibc-test/build-x86_64-linux/math/libm-test.c:65576
#5  0x0000000000401aa8 in main (argc=<optimized out>, argv=<optimized out>)
    at /export/build/gnu/glibc-test/build-x86_64-linux/math/libm-test.c:150244
(gdb) p $rsp
$1 = (void *) 0x7fffffffdaa8
(gdb) 

when this patch:

https://sourceware.org/ml/libc-alpha/2015-07/msg00365.html

is applied and GCC bug:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58066

is fixed.

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