From a026ae1b03feae10179816acb3c7d36e83547d4c Mon Sep 17 00:00:00 2001 From: Willem Date: Thu, 9 Oct 2014 22:20:19 -0700 Subject: Add (currently failing) test to check for correct long double alignment in varargs on x86_64. --- test/Feature/VarArgLongDouble.c | 43 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 test/Feature/VarArgLongDouble.c (limited to 'test') diff --git a/test/Feature/VarArgLongDouble.c b/test/Feature/VarArgLongDouble.c new file mode 100644 index 00000000..189d1dcc --- /dev/null +++ b/test/Feature/VarArgLongDouble.c @@ -0,0 +1,43 @@ +// RUN: %llvmgcc %s -emit-llvm -O0 -c -o %t.bc +// RUN: rm -rf %t.klee-out +// RUN: %klee --output-dir=%t.klee-out %t.bc | FileCheck %s +// XFAIL: + +#include +#include +#include + +void ld_after_zero(int first,...) +{ + va_list ap; + long double dub; + + va_start(ap, first); + + while (va_arg(ap, int) != 0) + ; + + dub = va_arg(ap, long double); + + printf("%Lf\n", dub); + +} + +int main() { + long double dub = 1.123456; + int zero = 0; + int one = 1; + + // AMD64-ABI 3.5.7p5: Step 7. Align l->overflow_arg_area upwards to a 16 + // byte boundary if alignment needed by type exceeds 8 byte boundary. + // + // the long double dub requires 16 byte alignment. + // we try passing one,zero and one, one, zero + // at least on those will align dub such that it needs the extra alignment + ld_after_zero(one, zero, dub); + // CHECK: 1.123456 + ld_after_zero(one, one, zero, dub); + // CHECK-NEXT: 1.123456 + + return 0; +} -- cgit 1.4.1