tgsi: add MEMBAR opcode to handle memoryBarrier* GLSL intrinsics

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Marek Olšák <marek.olsak@amd.com> (v1)
v1 -> v2: add defines for the various bits
Reviewed-by: Roland Scheidegger <sroland@vmware.com>

src/gallium/auxiliary/tgsi/tgsi_info.c

@@ -149,7 +149,7 @@ static const struct tgsi_opcode_info opcode_info[TGSI_OPCODE_LAST] =
    { 1, 2, 0, 0, 0, 0, 0, COMP, "FSGE", TGSI_OPCODE_FSGE },
    { 1, 2, 0, 0, 0, 0, 0, COMP, "FSLT", TGSI_OPCODE_FSLT },
    { 1, 2, 0, 0, 0, 0, 0, COMP, "FSNE", TGSI_OPCODE_FSNE },
-   { 0, 1, 0, 0, 0, 0, 1, NONE, "", 112 },      /* removed */
+   { 0, 1, 0, 0, 0, 0, 0, OTHR, "MEMBAR", TGSI_OPCODE_MEMBAR },
    { 0, 1, 0, 0, 0, 0, 0, NONE, "CALLNZ", TGSI_OPCODE_CALLNZ },
    { 0, 1, 0, 0, 0, 0, 0, NONE, "", 114 },     /* removed */
    { 0, 1, 0, 0, 0, 0, 0, NONE, "BREAKC", TGSI_OPCODE_BREAKC },

src/gallium/docs/source/tgsi.rst

@@ -2372,6 +2372,23 @@ programs.
   the program.  Results are unspecified if any of the remaining
   threads terminates or never reaches an executed BARRIER instruction.
 
+.. opcode:: MEMBAR - Memory barrier
+
+  ``MEMBAR type``
+
+  This opcode waits for the completion of all memory accesses based on
+  the type passed in. The type is an immediate bitfield with the following
+  meaning:
+
+  Bit 0: Shader storage buffers
+  Bit 1: Atomic buffers
+  Bit 2: Images
+  Bit 3: Shared memory
+  Bit 4: Thread group
+
+  These may be passed in in any combination. An implementation is free to not
+  distinguish between these as it sees fit. However these map to all the
+  possibilities made available by GLSL.
 
 .. _atomopcodes:
 

src/gallium/include/pipe/p_shader_tokens.h

@@ -420,7 +420,7 @@ struct tgsi_property_data {
 #define TGSI_OPCODE_FSLT                110
 #define TGSI_OPCODE_FSNE                111
 
-                                /* gap */
+#define TGSI_OPCODE_MEMBAR              112
 #define TGSI_OPCODE_CALLNZ              113
                                 /* gap */
 #define TGSI_OPCODE_BREAKC              115
@@ -744,6 +744,11 @@ struct tgsi_instruction_memory
    unsigned Padding   : 29;
 };
 
+#define TGSI_MEMBAR_SHADER_BUFFER (1 << 0)
+#define TGSI_MEMBAR_ATOMIC_BUFFER (1 << 1)
+#define TGSI_MEMBAR_SHADER_IMAGE  (1 << 2)
+#define TGSI_MEMBAR_SHARED        (1 << 3)
+#define TGSI_MEMBAR_THREAD_GROUP  (1 << 4)
 
 #ifdef __cplusplus
 }