as: MIPS FP ABI Selection
9.26.9.3 Automatic selection of FP ABI
......................................
In order to simplify and add safety to the process of selecting the
correct floating-point ABI, the assembler will automatically infer the
correct '.gnu_attribute 4, N' directive based on command-line options
and '.module' overrides. Where an explicit '.gnu_attribute 4, N'
directive has been seen then a warning will be raised if it does not
match an inferred setting.
The floating-point ABI is inferred as follows. If '-msoft-float' has
been used the module will be marked as soft-float. If '-msingle-float'
has been used then the module will be marked as single-precision. The
remaining ABIs are then selected based on the FP register width.
Double-precision is selected if the width of GP and FP registers match
and the special double-precision variants for 32-bit ABIs are then
selected depending on '-mfpxx', '-mfp64' and '-mno-odd-spreg'.
Info Catalog
as: MIPS FP ABI Variants
as: MIPS FP ABIs
as: MIPS FP ABI Compatibility