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CMLE (zero)

Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped.

Compare signed Less than or Equal to zero (vector). This instruction reads each vector element in the source SIMD&FP register and if the signed integer value is less than or equal to zero sets every bit of the corresponding vector element in the destination SIMD&FP register to one, otherwise sets every bit of the corresponding vector element in the destination SIMD&FP register to zero.

Compare signed Less than or Equal to zero (vector). This instruction reads each vector element in the source SIMD&FP register and if the signed integer value is less than or equal to zero sets every bit of the corresponding vector element in the destination SIMD&FP register to one, otherwise sets every bit of the corresponding vector element in the destination SIMD&FP register to zero.

Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped.

It has encodings from 2 classes: Scalar and Vector

Scalar

313029282726252423222120191817161514131211109876543210
01111110size100000100110RnRd
Uop

CMLE <V><d>, <V><n>, #0

integer d = UInt(Rd); integer n = UInt(Rn); if size != '11' then UNDEFINED; integer esize = 8 << UInt(size); integer datasize = esize; integer elements = 1; CompareOp comparison; case op:U of when '00' comparison = CompareOp_GT; when '01' comparison = CompareOp_GE; when '10' comparison = CompareOp_EQ; when '11' comparison = CompareOp_LE;

Vector

313029282726252423222120191817161514131211109876543210
0Q101110size100000100110RnRd
Uop

CMLE <Vd>.<T>, <Vn>.<T>, #0

integer d = UInt(Rd); integer n = UInt(Rn); if size:Q == '110' then UNDEFINED; integer esize = 8 << UInt(size); integer datasize = if Q == '1' then 128 else 64; integer elements = datasize DIV esize; CompareOp comparison; case op:U of when '00' comparison = CompareOp_GT; when '01' comparison = CompareOp_GE; when '10' comparison = CompareOp_EQ; when '11' comparison = CompareOp_LE;

Assembler Symbols

<V> Is a width specifier, encoded in size:
size<V>
0xRESERVED
10RESERVED
11D
<V>

Is a width specifier, encoded in size:

size<V>
0xRESERVED
10RESERVED
11D
<d>

Is the number of the SIMD&FP destination register, encoded in the "Rd" field.

<n>

Is the number of the SIMD&FP source register, encoded in the "Rn" field.

<Vd>

Is the name of the SIMD&FP destination register, encoded in the "Rd" field.

<T> Is an arrangement specifier, encoded in size:Q:
sizeQ<T>
0008B
00116B
0104H
0118H
1002S
1014S
110RESERVED
1112D
<T>

Is an arrangement specifier, encoded in size:Q:

sizeQ<T>
0008B
00116B
0104H
0118H
1002S
1014S
110RESERVED
1112D
<Vn>

Is the name of the SIMD&FP source register, encoded in the "Rn" field.

Operation

CheckFPAdvSIMDEnabled64(); bits(datasize) operand = V[n]; bits(datasize) result; integer element; boolean test_passed; for e = 0 to elements-1 element = SInt(Elem[operand, e, esize]); case comparison of when CompareOp_GT test_passed = element > 0; when CompareOp_GE test_passed = element >= 0; when CompareOp_EQ test_passed = element == 0; when CompareOp_LE test_passed = element <= 0; when CompareOp_LT test_passed = element < 0; Elem[result, e, esize] = if test_passed then Ones() else Zeros(); V[d] = result;

Operational information

If PSTATE.DIT is 1:


Internal version only: isa v32.13v32.12, AdvSIMD v29.05v29.04, pseudocode v2020-12v2020-09_xml, sve v2020-12v2020-09_rc3 ; Build timestamp: 2020-12-16T142020-11-18T17:1723

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