imask

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 0..15.

  • A gpr_idx value described below.

    Gpr_idx Value Syntax

    Description

    gpr_idx(<operands>)

    Enable indexing for specified operands and disable it for the rest. Operands 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.

    Operands 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)