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Floating-point instructions that update the condition flags
The only A32/T32 floating-point instructions that can update the condition flags are VCMP and VCMPE. Other floating-point or Advanced SIMD instructions cannot modify the flags.
VCMP and VCMPE do
not update the flags directly, but update a separate set of flags
in the Floating-Point Status and Control Register (FPSCR).
To use these flags to control conditional instructions, including
conditional floating-point instructions, you must first update the condition
flags yourself. To do this, copy the flags from the FPSCR into the
APSR using a VMRS instruction:
VMRS APSR_nzcv, FPSCR
All A64 floating-point comparison instructions can update the condition flags. These instructions update the flags directly in the NZCV register.