GCC generates SPE instructions even if -msoft-float is specified.
Explicitly add -mno-spe to prevent generation of SPE instructions. This
multilib variant must not lead to a usage of the SPE.
This patch should be applied to GCC 4.9 and mainline. I do not have
write access, so in case this gets approved, please commit it for me.
gcc/ChangeLog
2014-12-15 Sebastian Huber <sebastian.hu...@embedded-brains.de>
* config/rs6000/t-rtems: Add -mno-spe to soft-float multilib for
MPC8540.
---
gcc/config/rs6000/t-rtems | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/gcc/config/rs6000/t-rtems b/gcc/config/rs6000/t-rtems
index 3ebcfaa..e935947 100644
--- a/gcc/config/rs6000/t-rtems
+++ b/gcc/config/rs6000/t-rtems
@@ -30,6 +30,9 @@ MULTILIB_DIRNAMES += m403 m505 m603e m604 m860 m7400 m8540
MULTILIB_OPTIONS += msoft-float/mfloat-gprs=double
MULTILIB_DIRNAMES += nof gprsdouble
+MULTILIB_OPTIONS += mno-spe
+MULTILIB_DIRNAMES += nospe
+
MULTILIB_MATCHES += ${MULTILIB_MATCHES_ENDIAN}
MULTILIB_MATCHES += ${MULTILIB_MATCHES_SYSV}
# Map 405 to 403
@@ -66,6 +69,6 @@ MULTILIB_REQUIRED += mcpu=604/msoft-float
MULTILIB_REQUIRED += mcpu=7400
MULTILIB_REQUIRED += mcpu=7400/msoft-float
MULTILIB_REQUIRED += mcpu=8540
-MULTILIB_REQUIRED += mcpu=8540/msoft-float
+MULTILIB_REQUIRED += mcpu=8540/msoft-float/mno-spe
MULTILIB_REQUIRED += mcpu=8540/mfloat-gprs=double
MULTILIB_REQUIRED += mcpu=860
--
1.8.4.5
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