imaskΒΆ
This operand is a mask which controls indexing mode for operands of subsequent instructions. Bits 0, 1 and 2 control indexing of src0, src1 and src2, while bit 3 controls indexing of dst. Value 1 enables indexing, and value 0 disables it.
Bit
Meaning
0
Enables or disables src0 indexing.
1
Enables or disables src1 indexing.
2
Enables or disables src2 indexing.
3
Enables or disables dst indexing.
This operand may be specified as one of the following:
- An integer_number or an absolute_expression. The value must be in the range from 0 to 15. 
- A gpr_idx value which is described below. - Gpr_idx Value Syntax - Description - gpr_idx(<operand list>) - Enable indexing for the specified operands and disable it for the rest. Operand list is a comma-separated list of values which may include: - SRC0 - enable src0 indexing. 
- SRC1 - enable src1 indexing. 
- SRC2 - enable src2 indexing. 
- DST - enable dst indexing. 
 - Each of these values may be specified only once. - Operand list may be empty; this syntax disables indexing for all operands. 
Examples:
s_set_gpr_idx_mode 0
s_set_gpr_idx_mode gpr_idx()                        // the same as above
s_set_gpr_idx_mode 15
s_set_gpr_idx_mode gpr_idx(DST,SRC0,SRC1,SRC2)      // the same as above
s_set_gpr_idx_mode gpr_idx(SRC0,SRC1,SRC2,DST)      // the same as above
s_set_gpr_idx_mode gpr_idx(DST,SRC1)
