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| author | Stewart Smith <stewart@linux.vnet.ibm.com> | 2015-08-12 17:48:07 +1000 |
|---|---|---|
| committer | Stewart Smith <stewart@linux.vnet.ibm.com> | 2015-08-12 17:48:07 +1000 |
| commit | ced8a8bdfbde2f7c39bf75634eac6210f1d9729f (patch) | |
| tree | 7e79cccca0a315da457fb45150ed56c30011bcf7 | |
| parent | e41e541fafb27f54d4d28223bdca9667d78cb50f (diff) | |
| download | skiboot-ced8a8bdfbde2f7c39bf75634eac6210f1d9729f.zip skiboot-ced8a8bdfbde2f7c39bf75634eac6210f1d9729f.tar.gz skiboot-ced8a8bdfbde2f7c39bf75634eac6210f1d9729f.tar.bz2 | |
Newer GCC can automatically vectorise code. We do not want that.
Using vector instructions in skiboot needs care as we do not:
a) enable them during boot
b) save/restore the registers
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
| -rw-r--r-- | Makefile.main | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Makefile.main b/Makefile.main index d5975e2..d0e5f58 100644 --- a/Makefile.main +++ b/Makefile.main @@ -100,6 +100,12 @@ CFLAGS += -msoft-float CFLAGS += -mno-string # do not use load/store multiple word instrcutions CFLAGS += -mno-multiple +# do not use any automatic vector foo +# While it would be safe during boot, we don't save/restore across OPAL calls +CFLAGS += $(call try-cflag,$(CC),-mno-vsx) \ + $(call try-cflag,$(CC),-mno-direct-move) \ + $(call try-cflag,$(CC),-mno-altivec) + # Do not use load/store update. You REALLY do not want to use this! # The async safety of the ABI stack depends on the atomicity # of update on store. |