[gcc(refs/users/aoliva/heads/testme)] ppc: testsuite: pr79004 needs -mlong-double-128

[Alexandre Oliva <aoliva@gcc.gnu.org>]

https://gcc.gnu.org/g:fe3c0a30e72c978dcd9a70d131b2e9cb9f90e8e0

commit fe3c0a30e72c978dcd9a70d131b2e9cb9f90e8e0
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Sun Apr 21 17:24:28 2024 -0300

    ppc: testsuite: pr79004 needs -mlong-double-128
    
    Some of the asm opcodes expected by pr79004 depend on
    -mlong-double-128 to be output.  E.g., without this flag, the
    conditions of patterns @extenddf<mode>2 and extendsf<mode>2 do not
    hold, and so GCC resorts to libcalls instead of even trying
    rs6000_expand_float128_convert.
    
    Perhaps the conditions are too strict, and they could enable the use
    of conversion insns involving __ieee128/_Float128 even with 64-bit
    long doubles.  Alas, for now, we need this flag for the test to pass
    on target variants that use 64-bit long doubles.
    
    
    for  gcc/testsuite/ChangeLog
    
            * gcc.target/powerpr/pr79004.c: Add -mlong-double-128.

Diff:
---
 gcc/testsuite/gcc.target/powerpc/pr79004.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/testsuite/gcc.target/powerpc/pr79004.c b/gcc/testsuite/gcc.target/powerpc/pr79004.c
index caf1f6c1eef..83f20ca2243 100644
--- a/gcc/testsuite/gcc.target/powerpc/pr79004.c
+++ b/gcc/testsuite/gcc.target/powerpc/pr79004.c
@@ -1,6 +1,7 @@
 /* { dg-do compile { target { powerpc*-*-* && lp64 } } } */
 /* { dg-require-effective-target powerpc_vsx_ok } */
 /* { dg-options "-mdejagnu-cpu=power9 -mvsx -O2 -mfloat128" } */
+/* { dg-additional-options "-mlong-double-128" } */
 
 #include <math.h>