freedreno/ir3: add debug flag to disable cp

FD_MESA_DEBUG=nocp will disable copy propagation pass.

Signed-off-by: Rob Clark <robclark@freedesktop.org>

src/gallium/drivers/freedreno/freedreno_screen.c

@@ -70,6 +70,7 @@ static const struct debug_named_value debug_options[] = {
 		{"optmsgs",   FD_DBG_OPTMSGS,"Enable optimizater debug messages"},
 		{"optdump",   FD_DBG_OPTDUMP,"Dump shader DAG to .dot files"},
 		{"glsl130",   FD_DBG_GLSL130,"Temporary flag to enable GLSL 130 on a3xx+"},
+		{"nocp",      FD_DBG_NOCP,   "Disable copy-propagation"},
 		DEBUG_NAMED_VALUE_END
 };
 

src/gallium/drivers/freedreno/freedreno_util.h

@@ -66,6 +66,7 @@ enum adreno_stencil_op fd_stencil_op(unsigned op);
 #define FD_DBG_OPTMSGS  0x0400
 #define FD_DBG_OPTDUMP  0x0800
 #define FD_DBG_GLSL130  0x1000
+#define FD_DBG_NOCP     0x2000
 
 extern int fd_mesa_debug;
 extern bool fd_binning_enabled;

src/gallium/drivers/freedreno/ir3/ir3_cmdline.c

@@ -133,6 +133,7 @@ static void print_usage(void)
 	printf("    --saturate-s MASK - bitmask of samplers to saturate S coord\n");
 	printf("    --saturate-t MASK - bitmask of samplers to saturate T coord\n");
 	printf("    --saturate-r MASK - bitmask of samplers to saturate R coord\n");
+	printf("    --nocp            - disable copy propagation\n");
 	printf("    --help            - show this message\n");
 }
 
@@ -199,6 +200,12 @@ int main(int argc, char **argv)
 			continue;
 		}
 
+		if (!strcmp(argv[n], "--nocp")) {
+			fd_mesa_debug |= FD_DBG_NOCP;
+			n++;
+			continue;
+		}
+
 		if (!strcmp(argv[n], "--help")) {
 			print_usage();
 			return 0;

src/gallium/drivers/freedreno/ir3/ir3_compiler.c

@@ -3175,7 +3175,7 @@ ir3_compile_shader(struct ir3_shader_variant *so,
 		ir3_dump_instr_list(block->head);
 	}
 
-	if (cp)
+	if (cp && !(fd_mesa_debug & FD_DBG_NOCP))
 		ir3_block_cp(block);
 
 	if (fd_mesa_debug & FD_DBG_OPTDUMP)