The R600 back-end provides ISA code generation for AMD GPUs, starting with the R600 family up until the current Sea Islands (GCN Gen 2).
The assembler is currently a work in progress and not yet complete. Below are the currently supported features.
Unless otherwise mentioned, all SOPP instructions that with an operand accept a integer operand(s) only. No verification is performed on the operands, so it is up to the programmer to be familiar with the range or acceptable values.
s_waitcnt accepts named arguments to specify which memory counter(s) to wait for.
// Wait for all counters to be 0
s_waitcnt 0
// Equivalent to s_waitcnt 0. Counter names can also be delimited by
// '&' or ','.
s_waitcnt vmcnt(0) expcnt(0) lgkcmt(0)
// Wait for vmcnt counter to be 1.
s_waitcnt vmcnt(1)