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s390x: gate dynamic arch detection on gcc version and add generic

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When building OpenBLAS with DYNAMIC_ARCH=1 on s390x (aka zarch), make
sure to include support for systems without the facilities introduced
with z13 (i.e., zarch_generic). Adjust runtime detection to fallback to
that generic code when running on a unknown platform other than Z13
through Z15.

When detecting a Z13 or newer system, add a check for gcc support for
the architecture-specific features before selecting the respective
kernel. Fallback to Z13 or generic code, in case.

Signed-off-by: Marius Hillenbrand <mhillen@linux.ibm.com>
This commit is contained in:
Marius Hillenbrand
2020-05-11 12:37:21 +02:00
parent f94c53ec0a
commit 8c338616f9
2 changed files with 48 additions and 25 deletions
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3
Makefile.system
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@@ -563,7 +563,8 @@ DYNAMIC_CORE += EMAG8180
endif
ifeq ($(ARCH), zarch)
DYNAMIC_CORE = Z13
DYNAMIC_CORE = ZARCH_GENERIC
DYNAMIC_CORE += Z13
DYNAMIC_CORE += Z14
endif