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SPU-II: undefined0 inline asm

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Noam Preil 2020-07-10 20:29:55 -04:00 committed by Andrew Kelley
parent 803a1025bb
commit d005ff16c6
1 changed files with 23 additions and 0 deletions
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src-self-hosted/codegen.zig
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@ -1642,6 +1642,29 @@ fn Function(comptime arch: std.Target.Cpu.Arch) type {
if (!inst.is_volatile and inst.base.isUnused())
return MCValue.dead;
switch (arch) {
.spu_2 => {
if (inst.inputs.len > 0 or inst.output != null) {
return self.fail(inst.base.src, "TODO implement inline asm inputs / outputs for SPU Mark II", .{});
}
if (mem.eql(u8, inst.asm_source, "undefined0")) {
// Instructions are 16-bits, plus up to two sixteen bit immediates.
// Upper three bits of first byte are the execution
// condition; for now, only always (0b000) is supported.
// Next, there are two two-bit sequences indicating inputs;
// we only care to use zero (0b00).
// The lowest bit of byte one indicates whether flags
// should be updated; TODO: support that somehow.
// In all, we use a zero byte for the first half of the
// instruction.
// The second byte is 0bOOCCCCCR; OO is output behavior (we
// use zero, which discards the output), CCCCC is the
// command (8 for undefined0), R is reserved.
try self.code.appendSlice(&[_]u8{ 0x00, 0b00010000 });
return MCValue.none;
} else {
return self.fail(inst.base.src, "TODO implement support for more SPU II assembly instructions", .{});
}
},
.riscv64 => {
for (inst.inputs) |input, i| {
if (input.len < 3 or input[0] != '{' or input[input.len - 1] != '}') {