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SQDMULL (scalar)

Signed saturating Doubling Multiply Long.

Syntax

SQDMULL Vad, Vbn, Vbm

Where:

Va
Is the destination width specifier, and can be either S or D.
d
Is the number of the SIMD and FP destination register.
Vb
Is the source width specifier, and can be either H or S.
n
Is the number of the first SIMD and FP source register.
m
Is the number of the second SIMD and FP source register.

Usage

Signed saturating Doubling Multiply Long. This instruction multiplies corresponding vector elements in the lower or upper half of the two source SIMD and FP registers, doubles the results, places the final results in a vector, and writes the vector to the destination SIMD and FP register.

If overflow occurs with any of the results, those results are saturated. If saturation occurs, the cumulative saturation bit FPSR.QC is set.

The SQDMULL instruction extracts each source vector from the lower half of each source register, while the SQDMULL2 instruction extracts each source vector from the upper half of each source register.

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.

The following table shows the valid specifier combinations:

Table 19-18 SQDMULL (Scalar) specifier combinations

Va Vb
S H
D S
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