Hi,
with the attached patch -mhard-dfp is used whenever possible. So far
it was disabled by default for -m31 although hardware dfp is available
when also -mzarch is given.
Committed to mainline.
Bye,
-Andreas-
2012-02-21 Andreas Krebbel <andreas.kreb...@de.ibm.com>
* config/s390/s390.c (s390_option_override): Make -mhard-dfp the
default if possible and not specified otherwise.
---
gcc/config/s390/s390.c | 5 +++++
1 file changed, 5 insertions(+)
Index: gcc/config/s390/s390.c
===================================================================
*** gcc/config/s390/s390.c.orig
--- gcc/config/s390/s390.c
*************** s390_option_override (void)
*** 1540,1545 ****
--- 1540,1550 ----
if (TARGET_64BIT && !TARGET_ZARCH)
error ("64-bit ABI not supported in ESA/390 mode");
+ /* Use hardware DFP if available and not explicitly disabled by
+ user. E.g. with -m31 -march=z10 -mzarch */
+ if (!(target_flags_explicit & MASK_HARD_DFP) && TARGET_DFP)
+ target_flags |= MASK_HARD_DFP;
+
if (TARGET_HARD_DFP && !TARGET_DFP)
{
if (target_flags_explicit & MASK_HARD_DFP)
