SVE Instruction List by Dougall Johnson
PTRUE (predicate): Initialise predicate from named constraint
PTRUE Pd.B{, pattern} (SVE (SME
svbool_t svptrue_pat_b8(enum svpattern pattern)
128-bit SVE
If the constraint (
pattern) can be satisfied, set the low bits of (1) 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.
On 128-bit SVE, the following bits of (1) 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
256-bit SVE
If the constraint (
pattern) can be satisfied, set the low bits of (1) 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.
On 256-bit SVE, the following bits of (1) 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
512-bit SVE
If the constraint (
pattern) can be satisfied, set the low bits of (1) 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.
On 512-bit SVE, the following bits of (1) are set:
VL1, VL2, VL3, VL4, VL5, VL6, VL7, VL8, VL16, VL32: sets the low nMUL3: sets the low 63ALL, POW2, MUL4, VL64: sets all- any other constraint sets none
Larger sizes
1024-bit SVE
If the constraint (
pattern) can be satisfied, set the low bits of (1) 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.
On 1024-bit SVE, the following bits of (1) are set:
VL1, VL2, VL3, VL4, VL5, VL6, VL7, VL8, VL16, VL32, VL64: sets the low nMUL3: sets the low 126ALL, POW2, MUL4, VL128: sets all- any other constraint sets none
2048-bit SVE
If the constraint (
pattern) can be satisfied, set the low bits of (1) 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.
On 2048-bit SVE, the following bits of (1) are set:
VL1, VL2, VL3, VL4, VL5, VL6, VL7, VL8, VL16, VL32, VL64, VL128: sets the low nMUL3: sets the low 255ALL, POW2, MUL4, VL256: sets all- any other constraint sets none
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Inspired by and based on the x86/x64 SIMD Instruction List by Daytime.