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2018-10-15s390x: add single instruction fma and fmafSzabolcs Nagy2-0/+14
These are available in the s390x baseline isa -march=z900.
2017-06-23s390x: add single-instruction math functionsRich Felker24-0/+360
these were introduced in z196 and not available in the baseline (z900) ISA level. use __HTM__ as an alternate indicator for ISA level, since gcc did not define __ARCH__ until 7.x. patch by David Edelsohn.