[llvm-bugs] [Bug 47665] New: float128 argument not passed with va_arg

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47665

            Bug ID: 47665
           Summary: float128 argument not passed with va_arg
           Product: clang
           Version: 10.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C
          Assignee: unassignedclangbugs at nondot.org
          Reporter: shibatch.sf.net at gmail.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

The following testcase shows 0 if compiled with -O1 option.

#include <stdio.h>
#include <stdarg.h>

void func(int n, ...) {
  va_list ap;
  va_start(ap, n);
  __float128 q = va_arg(ap, __float128);
  va_end(ap);
  printf("%g\n", (double)q);
}

int main(void) {
  __float128 q = 0.1Q;
  func(0, q);
}


$ clang-10 -O1 vargf128.c
$ ./a.out
0
$ clang-10 -O0 vargf128.c
$ ./a.out
0.1

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