SVE Instruction List by Dougall Johnson
PTRUES: Initialise predicate from named constraint and set the condition flags
PTRUES Pd.D{, pattern} (SVE (SME
128-bit SVE
If the constraint (
pattern) can be satisfied, set the low predicate bits of (1) corresponding to 64-bit elements that match the constraint, zeroing all other bits. If the constraint cannot be satisfied, zero all bits of (1). If
pattern is omitted, the
ALL constraint is used.
The flags are set based on the resulting predicate, using the resulting predicate itself to indicate active lanes. If the constraint can be satisfied, FIRST and LAST will be true and NONE will be false. Otherwise, FIRST and LAST will be false and NONE will be true.
On 128-bit SVE, the following predicate bits of (1) corresponding to 64-bit elements are set:
VL1: sets the lowest bitALL, POW2, VL2: sets all- any other constraint sets none
256-bit SVE
If the constraint (
pattern) can be satisfied, set the low predicate bits of (1) corresponding to 64-bit elements that match the constraint, zeroing all other bits. If the constraint cannot be satisfied, zero all bits of (1). If
pattern is omitted, the
ALL constraint is used.
The flags are set based on the resulting predicate, using the resulting predicate itself to indicate active lanes. If the constraint can be satisfied, FIRST and LAST will be true and NONE will be false. Otherwise, FIRST and LAST will be false and NONE will be true.
On 256-bit SVE, the following predicate bits of (1) corresponding to 64-bit elements are set:
VL1, VL2, VL3: sets the low nMUL3: sets the low 3ALL, POW2, MUL4, VL4: sets all- any other constraint sets none
512-bit SVE
If the constraint (
pattern) can be satisfied, set the low predicate bits of (1) corresponding to 64-bit elements that match the constraint, zeroing all other bits. If the constraint cannot be satisfied, zero all bits of (1). If
pattern is omitted, the
ALL constraint is used.
The flags are set based on the resulting predicate, using the resulting predicate itself to indicate active lanes. If the constraint can be satisfied, FIRST and LAST will be true and NONE will be false. Otherwise, FIRST and LAST will be false and NONE will be true.
On 512-bit SVE, the following predicate bits of (1) corresponding to 64-bit elements are set:
VL1, VL2, VL3, VL4, VL5, VL6, VL7: sets the low nMUL3: sets the low 6ALL, POW2, MUL4, VL8: sets all- any other constraint sets none
Larger sizes
1024-bit SVE
If the constraint (
pattern) can be satisfied, set the low predicate bits of (1) corresponding to 64-bit elements that match the constraint, zeroing all other bits. If the constraint cannot be satisfied, zero all bits of (1). If
pattern is omitted, the
ALL constraint is used.
The flags are set based on the resulting predicate, using the resulting predicate itself to indicate active lanes. If the constraint can be satisfied, FIRST and LAST will be true and NONE will be false. Otherwise, FIRST and LAST will be false and NONE will be true.
On 1024-bit SVE, the following predicate bits of (1) corresponding to 64-bit elements are set:
VL1, VL2, VL3, VL4, VL5, VL6, VL7, VL8: sets the low nMUL3: sets the low 15ALL, POW2, MUL4, VL16: sets all- any other constraint sets none
2048-bit SVE
If the constraint (
pattern) can be satisfied, set the low predicate bits of (1) corresponding to 64-bit elements that match the constraint, zeroing all other bits. If the constraint cannot be satisfied, zero all bits of (1). If
pattern is omitted, the
ALL constraint is used.
The flags are set based on the resulting predicate, using the resulting predicate itself to indicate active lanes. If the constraint can be satisfied, FIRST and LAST will be true and NONE will be false. Otherwise, FIRST and LAST will be false and NONE will be true.
On 2048-bit SVE, the following predicate bits of (1) corresponding to 64-bit elements are set:
VL1, VL2, VL3, VL4, VL5, VL6, VL7, VL8, VL16: sets the low nMUL3: sets the low 30ALL, POW2, MUL4, VL32: sets all- any other constraint sets none
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Inspired by and based on the x86/x64 SIMD Instruction List by Daytime.