SQSHL (vector, immediate)
Signed saturating Shift Left (immediate).
- Is the name of the SIMD and FP destination register.
- Is an arrangement specifier, and can be one of the values shown in Usage.
- Is the name of the SIMD and FP source register.
- Is the left shift amount, in the range 0 to the element width in bits minus 1, and can be one of the values shown in Usage.
Signed saturating Shift Left (immediate). This instruction reads each vector element in the source SIMD and FP register, shifts each result by an immediate value, places the final result in a vector, and writes the vector to the destination SIMD and FP register. The results are truncated. For rounded results, see UQRSHL in the ARMv8-A Architecture Reference Manual.
If overflow occurs with any of the results, those results are saturated. If saturation occurs, the cumulative saturation bit FPSR.QC is set.
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 20-65 SQSHL (Vector) specifier combinations
|8B||0 to 7|
|16B||0 to 7|
|4H||0 to 15|
|8H||0 to 15|
|2S||0 to 31|
|4S||0 to 31|
|2D||0 to 63|