Rotates the contents of a general-purpose register to the left by a specified number of bits, merges the result with the contents of the MQ Register under control of a generated mask, and places the rotated word in the MQ Register and the merged result in another general-purpose register.
Note: The sreq instruction is supported only in the POWER architecture.
| POWER | |
|---|---|
| sreq | RA,RS,RB |
| sreq. | RA,RS,RB |
The sreq instruction rotates the contents of the source general-purpose register (GPR) RS to the left by 32 minus N bits, where N is the shift amount specified in bits 27-31 of GPR RB, merges the rotated word with the contents of the MQ Register under a generated mask, and stores the rotated word in the MQ Register and the merged word in GPR RA. The mask consists of N zeros followed by 32 minus N ones.
The sreq instruction has two syntax forms. Each syntax form has a different effect on Condition Register Field 0.
| Syntax Form | Overflow Exception (OE) | Fixed-Point Exception Register | Record Bit (Rc) | Condition Register Field 0 |
| sreq | None | None | 0 | None |
| sreq. | None | None | 1 | LT,GT,EQ,SO |
The two syntax forms of the sreq instruction never affect the Fixed-Point Exception Register. If the syntax form sets the Record (Rc) bit to 1, the instruction affects the Less Than (LT) zero, Greater Than (GT) zero, Equal To (EQ) zero, and Summary Overflow (SO) bits in Condition Register Field 0.
# Assume GPR 4 contains 0x9000 300F. # Assume GPR 7 contains 0x0000 0004. # Assume the MQ Register contains 0xEFFF FFFF. sreq 6,4,7 # GPR 6 now contains 0xE900 0300. # The MQ Register now contains 0xF900 0300.
# Assume GPR 4 contains 0xB00 300F. # Assume GPR 18 contains 0x0000 0004. # Assume the MQ Register contains 0xEFFF FFFF sreq. 6,4,18 # GPR 6 now contains 0xEB00 0300. # The MQ Register now contains 0xFB00 0300. # Condition Register Field 0 now contains 0x8.
Fixed-Point Rotate and Shift Instructions.