FISUB

X87_ALU X87 x86_64

2 encoding forms.

XED_FISUB_X86_LEGACY_ONEBYTE_DA_939731
REG0=XED_REG_ST0:rw:IMPL:f80 MEM0:r:mem32int REG1=XED_REG_X87STATUS:w:SUPP
X86_LEGACY DA /4 X87
XED_FISUB_X86_LEGACY_ONEBYTE_DE_745712
REG0=XED_REG_ST0:rw:IMPL:f80 MEM0:r:mem16int REG1=XED_REG_X87STATUS:w:SUPP
X86_LEGACY DE /4 X87