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authorMarius Hillenbrand <mhillen@linux.ibm.com>2020-12-01 15:36:34 +0100
committerRich Felker <dalias@aerifal.cx>2020-12-03 19:07:24 -0500
commit738c4e945c1218559d36b83cbaba11459fad89c9 (patch)
tree58c66e2603b4c9c0ebde61ea79f6cf8dece07261 /src
parent821083ac7b54eaa040d5a8ddc67c6206a175e0ca (diff)
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s390x: derive float_t from compiler or default to float
float_t should represent the type that is used to evaluate float
expressions internally. On s390x, float_t is currently set to double.
In contrast, the isa supports single-precision float operations and
compilers by default evaluate float in single precision, which
violates the C standard (sections 5.2.4.2.2 and 7.12 in C11/C17, to be
precise). With -fexcess-precision=standard, gcc evaluates float in
double precision, which aligns with the standard yet at the cost of
added conversion instructions.

gcc-11 will drop the special case to retrofit double precision
behavior for -fexcess-precision=standard so that __FLT_EVAL_METHOD__
will be 0 on s390x in any scenario.

To improve standards compliance and compatibility with future compiler
direction, this patch changes the definition of float_t to be derived
from the compiler's __FLT_EVAL_METHOD__.
Diffstat (limited to 'src')
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