freedreno/a3xx/compiler: new compiler

The new compiler generates a dependency graph of instructions, including
a few meta-instructions to handle PHI and preserve some extra
information needed for register assignment, etc.

The depth pass assigned a weight/depth to each node (based on sum of
instruction cycles of a given node and all it's dependent nodes), which
is used to schedule instructions.  The scheduling takes into account the
minimum number of cycles/slots between dependent instructions, etc.
Which was something that could not be handled properly with the original
compiler (which was more of a naive TGSI translator than an actual
compiler).

The register assignment is currently split out as a standalone pass.  I
expect that it will be replaced at some point, once I figure out what to
do about relative addressing (which is currently the only thing that
should cause fallback to old compiler).

There are a couple new debug options for FD_MESA_DEBUG env var:

  optmsgs - enable debug prints in optimizer
  optdump - dump instruction graph in .dot format, for example:

http://people.freedesktop.org/~robclark/a3xx/frag-0000.dot.png
http://people.freedesktop.org/~robclark/a3xx/frag-0000.dot

At this point, thanks to proper handling of instruction scheduling, the
new compiler fixes a lot of things that were broken before, and does not
appear to break anything that was working before[1].  So even though it
is not finished, it seems useful to merge it in it's current state.

[1] Not merged in this commit, because I'm not sure if it really belongs
in mesa tree, but the following commit implements a simple shader
emulator, which I've used to compare the output of the new compiler to
the original compiler (ie. run it on all the TGSI shaders dumped out via
ST_DEBUG=tgsi with various games/apps):

https://github.com/freedreno/mesa/commit/163b6306b1660e05ece2f00d264a8393d99b6f12

Signed-off-by: Rob Clark <[email protected]>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/gallium/drivers/freedreno/a3xx/disasm-a3xx.c b/src/gallium/drivers/freedreno/a3xx/disasm-a3xx.c
index 0e45ec54b38..8c3704bf658 100644
--- a/src/gallium/drivers/freedreno/a3xx/disasm-a3xx.c
+++ b/src/gallium/drivers/freedreno/a3xx/disasm-a3xx.c
@@ -735,6 +735,14 @@ struct opc_info {
 
 #define GETINFO(instr) (&(opcs[((instr)->opc_cat << NOPC_BITS) | instr_opc(instr)]))
 
+// XXX hack.. probably should move this table somewhere common:
+#include "ir3.h"
+const char *ir3_instr_name(struct ir3_instruction *instr)
+{
+	if (instr->category == -1) return "??meta??";
+	return opcs[(instr->category << NOPC_BITS) | instr->opc].name;
+}
+
 static void print_instr(uint32_t *dwords, int level, int n)
 {
 	instr_t *instr = (instr_t *)dwords;