FSUB

X87_ALU X87 x86_64

6 encoding forms.

X86_FSUB_X86_LEGACY_ONEBYTE_D8_332752
st(0), st(i)
X86_LEGACY D8 FPU
X86_FSUB_X86_LEGACY_ONEBYTE_DC_677184
st(i), st(0)
X86_LEGACY DC FPU
XED_FSUB_X86_LEGACY_ONEBYTE_D8_226080
REG0=XED_REG_ST0:rw:IMPL:f80 REG1=X87():r:f80 REG2=XED_REG_X87STATUS:w:SUPP
X86_LEGACY D8 /4 X87
XED_FSUB_X86_LEGACY_ONEBYTE_D8_327665
REG0=XED_REG_ST0:rw:IMPL:f80 MEM0:r:mem32real REG1=XED_REG_X87STATUS:w:SUPP
X86_LEGACY D8 /4 X87
XED_FSUB_X86_LEGACY_ONEBYTE_DC_580833
REG0=XED_REG_ST0:rw:IMPL:f80 MEM0:r:m64real REG1=XED_REG_X87STATUS:w:SUPP
X86_LEGACY DC /4 X87
XED_FSUB_X86_LEGACY_ONEBYTE_DC_901970
REG0=X87():rw:f80 REG1=XED_REG_ST0:r:IMPL:f80 REG2=XED_REG_X87STATUS:w:SUPP
X86_LEGACY DC /5 X87