CFLTLO (register)

Compare registers and fault if lower

This instruction compares the values in two registers, and generates a Conditional fault exception if the first value is lower than the second. If an exception is generated, the <reason> operand is copied to ESR_ELx.

This instruction does not affect the condition flags.

This is a pseudo-instruction of CFLT<cc> (register). This means:

The encodings in this description are named to match the encodings of CFLT<cc> (register).
The assembler syntax is used only for assembly, and is not used on disassembly.
The description of CFLT<cc> (register) gives the operational pseudocode, any constrained unpredictable behavior, and any operational information for this instruction.

Fault class

(FEAT_CFLT)

31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
sf	1	1	1	0	1	1	0	0	1	0	Rm					0	0	0	0	imm2		1	0	0	0	0	Rt
								cc

32-bit higher encoding

(sf == 0)

CFLTLO #<reason>, <Wm|WSP>, <Wt|WSP>

is equivalent to

CFLTHI #<reason>, <Wt|WSP>, <Wm|WSP>

64-bit higher encoding

(sf == 1)

CFLTLO #<reason>, <Xm|SP>, <Xt|SP>

is equivalent to

CFLTHI #<reason>, <Xt|SP>, <Xm|SP>

Assembler Symbols

Is a 2-bit unsigned immediate, in the range 0 to 3, encoded in the "imm2" field.

<Wm|WSP>

Is the 32-bit name of the general-purpose register or stack pointer to be tested, encoded in the "Rm" field.

<Wt|WSP>

Is the 32-bit name of the second general-purpose source register or stack pointer, encoded in the "Rt" field.

<Xm|SP>

Is the 64-bit name of the general-purpose register or stack pointer to be tested, encoded in the "Rm" field.

<Xt|SP>

Is the 64-bit name of the second general-purpose source register or stack pointer, encoded in the "Rt" field.

Operation

The description of CFLT<cc> (register) gives the operational pseudocode for this instruction.